Exhibit 10.28

                              AMENDED AND RESTATED

                 LICENSE AND RESEARCH AND DEVELOPMENT AGREEMENT

                                     BETWEEN

      REVOTAR BIOPHARMACEUTICALS AG, registered in the commercial register of
      the local court of Neuruppin HRB 5951 represented by its CEO, Dr. Gunter
      Rosskamp

                                                    - referred to as "Revotar" -

and

      TEXAS BIOTECHNOLOGY CORPORATION, represented by its President and C.E.O.
      Dr. Bruce D. Given, 7000 Fannin, USA TX 77030 Houston,

                                                          referred to as "TBC" -


                                TABLE OF CONTENTS



                                                                                                   PAGE
                                                                                                   ----
                                                                                                
1.       DEFINITIONS ..........................................................................       1
         1.1      "AFFILIATE" .................................................................       1
         1.2      "CASH EQUIVALENTS" ..........................................................       2
         1.3      "COMPOUND" ..................................................................       2
         1.4      "CONFIDENTIAL INFORMATION" ..................................................       2
         1.5      "COPD" ......................................................................       2
         1.6      "COST OF GOODS SOLD" OR "COGS" ..............................................       2
         1.7      "DEVELOPMENT COSTS" .........................................................       2
         1.8      "DEVELOPMENT PROGRAM" .......................................................       3
         1.9      "DISTRIBUTION COSTS" ........................................................       3
         1.10     "EFFECTIVE DATE" ............................................................       3
         1.11     "EUROPEAN MARKET" ...........................................................       4
         1.12     "FDA" .......................................................................       4
         1.13     "FIELD OF USE" ..............................................................       4
         1.14     "FIRST COMMERCIAL SALE" .....................................................       4
         1.15     "GROSS RECEIPTS" ............................................................       4
         1.16     "IND" .......................................................................       4
         1.17     "IMPROVEMENTS" ..............................................................       4
         1.18     "LICENSING TRANSACTION" .....................................................       4
         1.19     "MANUFACTURING COSTS" .......................................................       5
         1.20     "NDA ........................................................................       5
         1.21     "NET INCOME .................................................................       6
         1.22     "NET SALES" .................................................................       6
         1.23     "NEW INDICATIONS" ...........................................................       6
         1.24     "NORTH AMERICA ..............................................................       6
         1.25     "PRA" .......................................................................       6
         1.26     "PARTICIPATION AGREEMENT" ...................................................       6
         1.27     "PATENTS" ...................................................................       6
         1.28     "PHASE I CLINICAL TRIALS" ...................................................       7
         1.29     "PHASE II CLINICAL TRIALS" ..................................................       7
         1.30     "PHASE III CLINICAL TRIALS" .................................................       7
         1.31     "PRODUCT" ...................................................................       7
         1.32     "PRODUCT EBITDA" ............................................................       7
         1.33     "PROJECT REPRESENTATIVE" ....................................................       7
         1.34     "SUBJECT TECHNOLOGY" ........................................................       8
         1.35     "TBC1269 PROGRAM" ...........................................................       8
         1.36     "TECHNOLOGY" ................................................................       8
         1.37     "TERRITORY" .................................................................       8
         1.38     "THIRD PARTY" ...............................................................       8
         1.39     "WORK PLAN" .................................................................       8
         1.40     "WORLDWIDE LICENSE" .........................................................       9

2.       LICENSE TO REVOTAR ...................................................................       9



                                       i




                                                                                                   PAGE
                                                                                                   ----
                                                                                                
         2.1      EXCLUSIVE LICENSE FOR THE TERRITORY .........................................       9
         2.2      RIGHT OF REVOTAR AND TBC TO GRANT SUBLICENSES ...............................       9
         2.4      RIGHTS AND DUTIES IN CONNECTION WITH A LICENSING TRANSACTION TO A THIRD PARTY      10

3.       DEVELOPMENT PROGRAM ..................................................................      10
         3.1      GOALS .......................................................................      10
         3.2      PROGRAM ADMINISTRATION ......................................................      13
         3.3      PERFORMANCE OF SERVICES .....................................................      16
         3.4      RECORDS AND DATA ............................................................      16
         3.5      VISIT OF FACILITIES .........................................................      17

4.       PAYMENTS AND REPORTS .................................................................      17
         4.1      Development Funding .........................................................      17
         4.2      ROYALTIES ...................................................................      18
         4.3      AUDIT RIGHTS ................................................................      21
         4.4      PAYMENT CURRENCY ............................................................      22
         4.5      PAYMENT MECHANICS ...........................................................      23

5.       COMMERCIALIZATION ....................................................................      24
         5.1      TBC TO MANUFACTURE ..........................................................      24
         5.2      REVOTAR AND TBC TO SELL IN TERRITORY AND NORTH AMERICA, RESPECTIVELY ........      24
         5.3      SUBLICENSING ................................................................      25

6.       TBC REPRESENTATIONS AND WARRANTIES ...................................................      25
         6.1      NO THIRD PARTY AGREEMENTS ...................................................      25
         6.2      NO THIRD PARTY RIGHTS .......................................................      25

7.       PROPRIETARY RIGHTS ...................................................................      27
         7.1      IMPROVEMENTS ................................................................      27
         7.2      PATENT PROSECUTION AND MAINTENANCE ..........................................      27
         7.3      THIRD PARTY CLAIM OF INFRINGEMENT ...........................................      29
         7.4      INFRINGEMENT BY THIRD PARTIES ...............................................      30

8.       CONFIDENTIALITY ......................................................................      31
         8.1      GENERAL .....................................................................      31
         8.2      DISCLOSURE OF AGREEMENT .....................................................      32

9.       INDEMNIFICATION ......................................................................      33
         9.1      MUTUAL RIGHT TO INDEMNIFICATION .............................................      33
         9.2      PROCEDURE ...................................................................      34
         9.3      PRODUCT LIABILITY INSURANCE .................................................      35

10.      TERM AND TERMINATION .................................................................      35
         10.1     LICENSE TERM ................................................................      35
         10.2     TERMINATION FOR BREACH ......................................................      36
         10.3     TERMINATION FOR FAILURE TO PROCEED ..........................................      36
         10.4     SURVIVAL OF OBLIGATIONS .....................................................      38



                                       ii




                                                                                                   PAGE
                                                                                                
11.      MISCELLANEOUS ........................................................................      38
         11.1     FORCE MAJEURE ...............................................................      38
         11.2     RELATIONSHIP OF THE PARTIES .................................................      39
         11.3     NOTICES.: ...................................................................      39
         11.4     SUCCESSORS AND ASSIGNS ......................................................      39
         11.5     AMENDMENTS AND WAIVERS ......................................................      40
         11.6     GOVERNING LAW ...............................................................      40
         11.7     DISPUTE RESOLUTION ..........................................................      40
         11.8     SEVERABILITY ................................................................      42
         11.9     HEADINGS ....................................................................      42
         11.10    EXECUTION IN COUNTERPARTS ...................................................      42
         11.11    ENTIRE AGREEMENT ............................................................      42



                                      iii


                              AMENDED AND RESTATED
                 LICENSE AND RESEARCH AND DEVELOPMENT AGREEMENT

This Amended and Restated License and Research and Development Agreement is
entered into on this day of January 24, 2003, between Texas Biotechnology
Corporation, a Delaware corporation ("TBC"), and Revotar Biopharmaceuticals AG,
a German stock company.

                                 R E C I T A L S

A.    TBC and Revotar entered into a License and Research and Development
      Agreement dated July 21, 2000 (the "License Agreement").

B.    TBC and Revotar wish to amend and restate the License Agreement pursuant
      to this Amended and Restated License and Research and Development
      Agreement (the "Agreement").

In consideration of the foregoing and the mutual promises and covenants
contained in this Agreement, the parties hereto agree to amend and restate the
License Agreement in its entirety effective as of the date hereof as follows:

1. DEFINITIONS.

The following capitalized terms used herein shall have the respective meanings
set forth below. The accounting terms used but not defined herein shall have the
meanings ascribed to them under U.S. Generally Accepted Accounting Principles.
Certain other capitalized terms are defined elsewhere in this Agreement.

      1.1   "AFFILIATE" means a person or entity that directly or indirectly
            controls, is controlled by or is under common control with, a party
            to this Agreement. "Control" (and, with correlative meanings, the
            terms "controlled by" and "under common control with") means, in the
            case of a corporation, the ownership of more than 50% of the
            outstanding voting securities thereof or the right to acquire


            such securities within 60 days and, in the case of any other type of
            entity (including without limitation joint ventures), an interest
            that results in the ability to direct or have a significant impact
            on the direction of the management and policies of such entity or a
            significant ownership position of no less than 25%.

      1.2   "CASH EQUIVALENTS" means cash or other instrument which is
            convertible into cash including equity in a Third Party valued as
            follows: the value of securities that are freely tradable in an
            established market will be determined by taking the average of the
            closing market price for the 10 trading days prior to the execution
            of an agreement, and the value of securities that are not freely
            tradable shall be the fair market value thereof as determined by
            Revotar and TBC.

      1.3   "COMPOUND" means the compound owned by TBC and known as TBC1269, and
            any salt forms thereof, and any Improvements thereon.

      1.4   "CONFIDENTIAL INFORMATION" means all proprietary information
            communicated to, learned of, developed or otherwise acquired by
            either party separately or jointly under this Agreement.

      1.5   "COPD" means chronic obstructive pulmonary disease.

      1.6   "COST OF GOODS SOLD" OR "COGS" means TBC's total Manufacturing Costs
            plus 10% of the Manufacturing Costs.

      1.7   "DEVELOPMENT COSTS" means (a) the direct costs, fees and
            out-of-pocket or other expenses incurred in the course of performing
            the work under the Development Program (b) overhead allocable to
            development and (c) the amount paid to Third Parties to acquire
            goods and services for the development work, whether or not
            completed. Overhead allocated to development shall be limited to (i)
            a reasonable


                                       2


            allocation of the cost of employees who have a direct relationship
            with the Development Program, but who are not classified as direct
            labor, which allocation shall be based on each such employee's time
            spent in the Development Program as compared to time spent on all
            such employee's work, and (ii) a reasonable allocation of
            facilities' costs allocable to development works. Development Costs
            shall be determined on a reasonable and typical basis consistent
            with the developing party's internal cost accounting system or on
            actual charges from Third Parties.

      1.8   "DEVELOPMENT PROGRAM" means development and other work conducted by
            the parties hereunder on a Product or Compound for use in the Field
            of Use, including clinical testing, regulatory submissions and
            ongoing Product and Compound development.

      1.9   "DISTRIBUTION COSTS" means all freight and other transportation
            costs actually incurred by a party hereto in delivering a Product to
            its final distribution point before delivery to an invoiced
            customer, including transportation costs to a storage facility,
            storage charges, Third Party handling fees, insurance during
            transport and taxes payable for such transportation or storage
            services. Distribution Costs shall exclude any transportation or
            other charges deducted in calculating Net Sales. Distribution Costs
            incurred by a party hereto shall be determined on a reasonable basis
            consistent with such party's internal cost accounting system.

      1.10  "EFFECTIVE DATE" means the day of the signing of this Agreement.


                                       3


      1.11  "EUROPEAN MARKET" means countries which are party of the European
            Patent Treaty ("Europaisches Patentrechtsubereinkommen").

      1.12  "FDA" means the United States Food and Drug Administration.

      1.13  "FIELD OF USE" means the development, manufacture, use or sale of
            the Compound, Products or Subject Technology for any indication
            except: a) organ transplantation, b) organ reperfusion injury, or c)
            immunologic tissue rejection.

      1.14  "FIRST COMMERCIAL SALE" means the first arms-length sale in the
            Territory pursuant to this Agreement to one or more Third Parties of
            any Product following receipt of approval to commence manufacturing
            and selling such Product from any one PRA.

      1.15  "GROSS RECEIPTS" means all cash or Cash Equivalents received by
            Revotar or TBC from a Third Party pursuant to a Licensing
            Transaction, including without limitation, up front payments,
            royalties, milestones, and profit or cash flow payments.

      1.16  "IND" means an investigational new drug application filed with the
            FDA, or the similar filing made with any PRA, prior to beginning
            clinical trials in humans.

      1.17  "IMPROVEMENTS" means any Technology that is discovered, developed or
            otherwise acquired in the course of the Development Program
            hereunder that may be applied to the discovery, development,
            manufacture, sale or use of the Compound or Products, excluding any
            new chemical entities that are developed by Revotar under this
            Agreement using the Subject Technology.

      1.18  "LICENSING TRANSACTION" means any agreement or arrangement of any
            type pursuant to which Revotar licenses or transfers to a Third
            Party any interest or


                                       4


            rights of any kind to any Subject Technology, Compound or Product
            which is the subject of this Agreement including without limitation
            the rights to use and sell any Compound or Product in the Field of
            Use.

      1.19  "MANUFACTURING COSTS" means (a) the direct material and labor costs
            associated with manufacturing the Products, (b) overhead allocable
            to manufacture of the Products and (c) the amount paid to Third
            Parties to acquire manufactured Products, whether or not completed,
            and (d) Distribution Costs. Direct material costs include the costs
            of purchasing raw materials and packaging components. Direct labor
            includes the costs of employees directly employed in Product
            manufacturing, quality control or packaging. Overhead allocated to
            manufacture of the Products shall be limited to (i) a reasonable
            allocation of the cost of employees who have a direct relationship
            with Product manufacturing, quality control or packaging, but who
            are not classified as direct labor, which allocation shall be based
            on each such employee's time spent in Product manufacturing, quality
            control or packaging as compared to time spent on all such
            employee's work, and (ii) a reasonable allocation of facilities'
            costs allocable to Product manufacturing, quality control and
            packaging. Manufacturing Costs shall be determined on a reasonable
            and typical basis consistent with the manufacturing party's internal
            cost accounting system or on actual charges from Third Parties.

      1.20  "NDA" means a new drug application filed with the FDA, or a similar
            application filed with any PRA to obtain marketing approval for a
            Product.


                                       5


      1.21  "NET INCOME" means Gross Receipts and Net Sales minus Cost of Goods
            Sold, promotional and selling expenses, payments to Third Parties,
            general and administrative overhead expenses that can all be
            attributed to the sales of Product.

      1.22  "NET SALES" means the gross amount billed for Products sold pursuant
            to this Agreement to a Third Party, less discounts, rebates,
            returns, credits, allowances, uncollectible sales, shipping,
            distribution and insurance charges, sales taxes, and other
            governmental charges measured by the amount billed.

      1.23  "NEW INDICATIONS" means any topical indication for the Compound,
            Products or Subject Technology being proposed for addition to the
            Work Plan.

      1.24  "NORTH AMERICA": countries and regions which are subject to the
            patent legislation of the USA and Canada.

      1.25  "PRA" means any applicable regulatory authority in any jurisdiction
            included within the Territory which regulates the development,
            approval and marketing of pharmaceuticals.

      1.26  "PARTICIPATION AGREEMENT" means that certain agreement entered into
            on July 21, 2000 by and between TBC and Revotar and certain German
            venture capital investors known as bmp Life Science AG Venture
            Capital, bmp Venture Tech and Mediport Venture Fonds GmbH.

      1.27  "PATENTS" means (a) the patent applications listed on APPENDIX 1
            attached hereto and all patent applications hereafter filed in the
            Territory that are owned by or licensed to or otherwise acquired by
            TBC in the Territory and which have one or more claims covering the
            Compound, Subject Technology or Improvements, (b) any patent
            application in the Territory constituting an equivalent, reissue,


                                       6


            extension, continuation-in-part or a division of any of the
            foregoing, and (c) any patents issued upon any of the foregoing
            applications or any other patents acquired by TBC relating to the
            Compound, Subject Technology or Improvements.

      1.28  "PHASE I CLINICAL TRIALS" means the first phase of human clinical
            trials of a Compound required by the FDA or a PRA in which the
            Compound is tested to determine early safety profile, drug
            distribution patterns, and metabolism.

      1.29  "PHASE II CLINICAL TRIALS" means the second phase of human clinical
            trials of a Compound required by the FDA or a PRA in which the
            Compound is tested in patients afflicted with a particular disease
            in order to gain preliminary evidence of efficacy, optimal dosage
            and expanded evidence of safety.

      1.30  "PHASE III CLINICAL TRIALS" means the third phase of human clinical
            trials of a Compound required by the FDA or a PRA in which the
            Compound is tested in patients afflicted with a particular disease
            in order to gain statistical proof of efficacy and safety.

      1.31  "PRODUCT" means any pharmaceutical composition incorporating the
            Compound which is to be used in the Field of Use.

      1.32  "PRODUCT EBITDA" means the Net Income before interest expense,
            taxes, depreciation expense and amortization expense that can be
            attributed to the development and commercialization of a Product.

      1.33  "PROJECT REPRESENTATIVE" means an individual designated by a party
            pursuant to Section 3.2(a). A Project Representative of a party may
            be changed at any time by written notice to the other party.


                                       7


      1.34  "SUBJECT TECHNOLOGY" means (i) all Technology owned or controlled by
            TBC as of the date hereof or owned or controlled by TBC hereafter
            during the term of this Agreement, but only to the extent that such
            Technology relates to the use, manufacture or sale of the Compound
            or Products. Technology "owned or controlled" includes Technology as
            to which TBC has the right to grant or cause to be granted
            sublicenses and/or immunity from suit.

      1.35  "TBC1269 PROGRAM" means the development of TBC1269 pursuant to this
            Agreement for the development of Products for use in the Field of
            Use.

      1.36  "TECHNOLOGY" means all ideas, methods, formulations, inventions,
            techniques, processes, know-how, trade secrets and other
            information.

      1.37  "TERRITORY" shall mean all countries of the World excluding the use
            and sale of the Compound, Products or Subject Technology for topical
            indications in North America.

      1.38  "THIRD PARTY" means any entity other than TBC, Revotar or their
            Affiliates.

      1.39  "WORK PLAN" means a written summary of the tasks to be undertaken by
            each party during a particular calendar year in connection with the
            development of the Compound or Products in the Territory only for
            topical indications, together with a budget of the anticipated
            Development Costs associated therewith, adopted by the parties. Each
            Work Plan will include reasonably detailed descriptions of the tasks
            and work to be performed, the resources required to accomplish the
            work, the costs associated with the planned work, the party that
            will be responsible for accomplishing each task, and the
            reimbursement or payment of costs by Revotar incurred by each party.


                                       8


      1.40  "WORLDWIDE LICENSE" means a Licensing Transaction, which may include
            multiple agreements with the same Third Party or Third Party
            Affiliate(s), in at least - but not necessarily only - all countries
            within North America and the European Market.

2. LICENSE TO REVOTAR.

      2.1   EXCLUSIVE LICENSE FOR THE TERRITORY. Subject to the terms and
            conditions of this Agreement, TBC hereby grants to Revotar an
            exclusive right and license in the Territory, including the
            exclusive right to grant sublicenses in the Territory, to develop,
            use and sell the Compound, Products or Subject Technology in the
            Field of Use.

                  TBC retains the exclusive rights to develop, make, have made,
            use and sell the Compound or Products for a) topical indications in
            North America, and b) all indications excluded from Field of Use.

                  The right of manufacturing remains with TBC pursuant to
            section 5.1 hereof unless (a) Revotar grants a sublicense to a Third
            Party which includes the manufacturing rights within the scope of
            the sublicense agreement, (b) Revotar is able to produce the goods
            at lesser Manufacturing Costs than TBC or (c) TBC determines that it
            does not want to commence manufacturing of the Compound or any
            Products, or with one year's notice to Revotar, determines that it
            will cease its manufacturing of the Compound or any Products.

      2.2   RIGHT OF REVOTAR AND TBC TO GRANT SUBLICENSES. TBC hereby grants to
            Revotar an exclusive right and license to enter into a sublicense
            agreement in the Territory of the same scope as defined in sec. 2.1
            above in the Field of Use . TBC


                                       9


            has the right to enter into a sublicense agreement for topical
            indications in North America and a worldwide right for a) organ
            transplantation, b) organ reperfusion injury, or c) immunologic
            tissue rejection.

            Revotar and TBC shall be obligated to perform in full all of the
            obligations and agreements of any sublicenses, including payment of
            royalties.

      2.3

      2.4   RIGHTS AND DUTIES IN CONNECTION WITH A LICENSING TRANSACTION TO A
            THIRD PARTY. Revotar will inform TBC if it enters into negotiations
            with a Third Party concerning any Licensing Transaction. Revotar
            will furthermore inform TBC about the course of such negotiations
            and provide TBC the opportunity for review and comment under the
            terms contained in 4.2.3(f) prior to the conclusion of a License
            Transaction with a Third Party.

3. DEVELOPMENT PROGRAM.

      3.1   GOALS.

            3.1.1 WORK PLANS FOR TOPICAL INDICATIONS. TBC and Revotar agree that
            they will conduct the development on the Compound and it's Products
            according to the Work Plans, with the goal of developing
            commercially marketable Products for topical indications in the
            shortest feasible period of time. The parties also agree that
            Revotar shall be responsible under the Work Plans for the
            development program defined therein, conduct any non-clinical work
            necessary for development of topical applications of the Compound,
            conduct the clinical trials regarding the Compound and it's Products
            in the Territory, and Patent filing,


                                       10


            maintenance and prosecution regarding the Products in the Territory.
            The obligations of the Work Plans for topical indications are
            considered to be completed when the conditions described in
            paragraph 3.2.2 (ii) or (iii) apply.

            3.1.2 DEVELOPMENT PROGRAM FOR OTHER INDICATIONS. Revotar will be
            responsible for conducting all the Development Programs regarding
            the Compound and the Products for all indications in the Field of
            Use other than the topical indications, and will be responsible for
            all costs associated therewith. TBC will have no responsibilities
            under and bear none of the expense for such efforts.

            3.1.3 PARTICIPATION BY TBC IN DEVELOPMENT PROGRAMS. Except where TBC
            and Revotar agree that it is necessary for obtaining regulatory
            approval, TBC does not intend to develop the Compound or it's
            Products in the Territory and in the Field of Use pursuant to the
            Development Program or the Work Plans. TBC, at its own expense, may
            undertake development work on the Compound or it's Products for use
            in topical indications in North America, or organ transplantation,
            organ reperfusion injury or immunologic tissue rejection throughout
            the world.

            3.1.4 LIMITATION ON CLINICAL TRIAL SPENDING BY REVOTAR.
            Notwithstanding the foregoing to the contrary, the parties
            contemplate that Revotar will not be required under the Development
            Program and the Work Plans to conduct and pay for any Phase III
            Clinical Trials involving the Compound or it's Products. The parties
            instead contemplate that Revotar will enter into a Licensing
            Transaction whereby a Third Party will conduct such trials.

            3.1.5 SHARING OF INFORMATION. Any safety data or information
            generated by TBC or Revotar (the "Parties") regarding the Compound
            will be shared with the


                                       11


            other party in English without cost for use as safety data and for
            the maintenance of the worldwide safety database. Any non-safety
            information generated by Revotar in topical indications will be
            shared with TBC in English without cost. Any information which is
            relevant for registration purposes generated by the Parties for
            non-topical indications will be shared in English upon reimbursement
            of 50% of the Development Costs associated with such work. Once
            information is paid for by a Party, its uses will be limited in the
            following manner; (i) for internal evaluation, (ii) non-confidential
            summary information may be shared with Third Parties without prior
            consent from either Party, (iii) detailed data can be used by the
            Parties or their licensees for registration or regulatory purposes
            necessary to obtain approvals from governmental agencies, (iv)
            detailed data may also be shared with a Third Party pursuant to a
            separate confidentiality agreement subject to the limitations
            contained in paragraph 8.2 and (v) any publication or public
            presentation of information will require prior approval of the
            originating party; such approval not to be unreasonably withheld.
            Revotar and TBC will endeavor to oblige any of its sublicensees, at
            their option, to pass on information concerning the Compound and
            Products relating to non-topical indications and to assent to
            passing on such information to Revotar and TBC on the same basis as
            provided above. Regarding topical indications, Revotar and TBC will
            endeavor to oblige any sublicensee to provide information regarding
            Compound or it's Products to Revotar or TBC in English without cost.
            TBC and Revotar will treat information in a manner consistent with
            (i) through (v) above.


                                       12


            3.1.6 BEST EFFORTS. While the parties agree to use best efforts to
            achieve the goals of the Development Program, neither TBC nor
            Revotar warrants or guarantees that their efforts will result in a
            marketable or approvable Product or that the goals specified in the
            Work Plan will be achieved within the periods set forth therein.

      3.2   PROGRAM ADMINISTRATION.

            3.2.1 PROJECT REPRESENTATIVE. The parties have each designated one
            Project Representative to facilitate liaison between it and the
            other party, oversee and review the progress of the Work Plans. In
            addition, the Project Representatives will agree on the Work Plans,
            will select which topical indications to pursue, determine the
            development program of the Work Plans for topical indications,
            develop clinical trial protocols, manage the clinical/regulatory
            process and discuss potential competition and other relevant matters
            to assure rapid development and commercialization of the Compound
            and the Products for topical indications within the Work Plans.

            3.2.2 DISAGREEMENTS. All decisions made hereunder relating to the
            Work Plans for topical indications shall require the approval of the
            Project Representatives. The Project Representatives shall attempt
            in good faith to reach consensus on all matters regarding such Work
            Plans. As long as (i) at least 30% of clinical spending in any
            calendar year by Revotar is related to topical indications, or as
            long as (ii) the Phase II clinical development for psoriasis and/or
            atopic dermatitis is completed, or as long as (iii) Revotar
            completes a Licensing Transaction for psoriasis and/or atopic
            dermatitis involving the European Union, then the final


                                       13


            decision making regarding any disagreements with the Work Plan will
            reside with the CEO of Revotar. In any year where none of (i)
            through (iii) above do occur, then the Project Representatives shall
            promptly present the disagreement to the chief executive officers of
            the Parties or their designees, who shall attempt resolution of the
            matter. If the chief executives or designees cannot promptly resolve
            such disagreement within thirty (30) days, then the dispute shall be
            resolved under the arbitration provisions of Section 11.7.

            3.2.3 WORK PLANS. The parties hereto will agree on the initial Work
            Plan for 2003 within 90 days of the Effective Date. If the Project
            Representatives agree to pursue New Indications, then a new Work
            Plan for those indications will be developed. The Work Plan for
            topical indications shall be the plan and budget as approved by both
            parties in writing. Prior to November 1 of each year, the Project
            Representatives shall prepare and recommend to each party a proposed
            Work Plan for the next calendar year. Each Work Plan adopted shall
            be agreed upon and signed by an officer of both parties no later
            than January 10 of the year covered by the Work Plan. The Project
            Representatives shall actively consult with one another throughout
            the term of the Development Program so as to adjust the specific
            work performed under each Work Plan to conform to evolving
            developments in technology and the results of the development work
            performed. While minor adjustments to a Work Plan may be made from
            time to time upon approval by the Project Representatives,
            significant changes to the scope or direction of the work in a Work
            Plan shall be agreed to in writing by each party,


                                       14


            in the absence of which the most recently approved Work Plan shall
            remain in effect.

            3.2.4 TOPICAL WORK OUTSIDE OF WORK PLAN BY TBC. TBC may conduct
            development work with the Product in topical indications outside of
            the Work Plan at TBC's expense. Revotar or its sublicensee will gain
            access to this information by reimbursing TBC 100% of its costs to
            generate such information and use of this information is limited to
            the terms of 3.1.5 (i) through 3.1.5 (v).

            3.2.5 PROGRESS REPORTS. Within 10 business days following the end of
            each six-month period, (a) the Project Representatives shall jointly
            produce a summary written report which shall describe the work
            performed by the respective party during the six month period on the
            Work Plans for topical indications and if appropriate, recommend any
            revisions to such Work Plan that would improve the progress of such
            Development Program, and (b) Revotar will provide TBC via the
            Revotar Supervisory Board with a progress report of the development
            program for all indications.

            3.2.6 MEETINGS. The Project Representatives and other employees or
            consultants of the parties responsible for management of the Work
            Plans for topical indications shall consult each other and meet as
            needed during the term of the Work Plans for review. Such meetings
            shall be at such times as may be agreed to by the Project
            Representatives, and may be conducted telephonically or in person as
            necessary at a time and location to be agreed upon by the Project
            Representatives. Revotar shall be responsible for the organization
            of such meetings, including payment for transportation and hotel
            accommodations. The


                                       15


            Project Representatives shall jointly produce minutes summarizing
            the matters reviewed and any actions taken at such meetings within
            10 business days following each meeting. Each party may invite
            additional colleagues to participate at meetings as appropriate and
            acceptable to the other party. Revotar shall be responsible for the
            preparation and communication to TBC of the specific agenda of each
            meeting in advance of each meeting and either party may place items
            for consideration on the agenda.

      3.3   PERFORMANCE OF SERVICES. Each party shall perform the work assigned
            to it in a prudent and skillful manner in accordance, in all
            material respects, with the Work Plan then in effect and applicable
            laws. Revotar shall reimburse TBC its Development Costs, and its out
            of pocket costs, including travel, lodging, salaries and benefits
            for all labor, supervision, facilities, supplies and materials
            necessary to perform the work assigned to TBC in accordance with the
            Work Plan. All cost allocations for developmental work to be
            performed by either party will be defined in detail in the Work Plan
            and are binding to both parties. Revotar and TBC agree that all
            development activities performed by either party will be conducted
            according to accepted guidelines of the International Conference on
            Harmonisation.

      3.4   RECORDS AND DATA. Each party shall maintain records in sufficient
            detail and in good scientific manner appropriate for patent and
            regulatory purposes and so as to properly reflect all work done by
            TBC and Revotar, and results achieved in the performance of the Work
            Plans. Such records shall include books, records, reports, research
            notes, charts, graphs, comments, computations, analyses,


                                       16


            recordings, photographs, computer programs and documentation
            thereof, computer information storage means, samples of materials
            and other graphic or written data generated in connection with the
            Work Plans, including any data required to be maintained pursuant to
            applicable governmental regulations. Each party shall provide the
            other the right to inspect all such records, and shall provide
            copies in the English language of all such requested records.

      3.5   VISIT OF FACILITIES. Representatives of each party may, upon
            reasonable notice and at times reasonably acceptable to the other
            party, (a) visit the facilities at their own expense where the Work
            Plans are being conducted and/or the facilities where the other
            party manufactures any Product or Compound contained therein (or has
            a Product or such a Compound manufactured by a Third Party), (b)
            consult informally, during such visits and by telephone, with
            personnel of the other party performing work on the Work Plans and
            (c) with the other party's prior approval, which approval shall not
            be unreasonably withheld, visit the sites of any clinical trials or
            other experiments being conducted by such other party in connection
            with the Work Plans, but only to the extent in each case as such
            trials or other experiments relate to the Work Plans.

4. PAYMENTS AND REPORTS.

      4.1   Development Funding. All Development Costs relating to the Compound
            and Products in the Field of Use in the Territory, whether incurred
            before or after marketing approval of any Product, shall be borne by
            Revotar. Except as provided in Section 3.1.5 and 3.2.4 above, TBC
            will bear its Development Costs regarding the Compound and Products
            for use in topical indications in North


                                       17


            America and for organ transplantation, organ reperfusion injury and
            immunologic tissue rejection.

      4.2   ROYALTIES.

            4.2.1 PAYMENTS TO TBC WHEN NO LICENSING TRANSACTION. In the event
            that Revotar commences sales of Products without having entered into
            any Licensing Transaction, Revotar or its Affiliates shall pay TBC
            the following amounts:

                  (a) [*] of Net Sales relating to sales of Products in the
            Territory for use in topical indications, asthma or COPD.

                  (b) [*] of Product EBITDA relating to sales of Products in the
            Territory for use in all indications other than asthma, topical
            indications or COPD.

            4.2.2 PAYMENTS BY TBC TO REVOTAR. In the event that TBC or its
            licensees commences sales of any products incorporating a Compound
            relating to any organ transplantation, organ reperfusion injury or
            immunologic tissue rejection, TBC or its Affiliates shall pay
            Revotar [*] of TBC's Product EBITDA for sales of such products by
            TBC, its licensees and its Affiliates. In the event TBC, its
            licensees and its Affiliates commence sales of Products for topical
            indications in North America, TBC or its Affiliates shall pay
            Revotar [*] of TBC's Product EBITDA for such Product sales by TBC,
            its licensees and its Affiliates; provided, that if Revotar is
            successful in obligating a licensee to share data with TBC as
            desired in 3.1.5, then TBC or its Affiliates shall pay Revotar [*]
            (instead of [*]) of TBC's Product EBITDA for such Product sales by
            TBC, its licensees and its Affiliates.

            4.2.3 ROYALTY RATES PAID TO TBC AFTER LICENSING TRANSACTION BY
            REVOTAR.

- ----------
[*]   This information has been omitted in reliance on Rule 24B-2 under the
      Securities Exchange Act of 1934, and has been filed separately with the
      Securities and Exchange Commission.


                                       18


                  (a) If Revotar enters into a Worldwide License pursuant to
            Sec. 2.4 with a Third Party covering the asthma indication alone or
            covering the asthma indication and COPD, then all royalties, license
            fees, milestone payments and other payments or revenues of any kind
            received by Revotar and its Affiliates pursuant to such Worldwide
            License relating to the asthma indication and COPD shall be shared
            equally with TBC. For purposes of this Section 4.2.3(a), in the
            event that Revotar enters into any Worldwide License with a Third
            Party covering Products for the treatment of asthma and then enters
            into a Licensing Transaction with the same Third Party covering COPD
            within nine (9) months before or after the Worldwide License
            involving asthma, then Revotar shall be considered for purposes of
            this Section 4.2.3 to have entered into a Worldwide License covered
            by the provisions of this subparagraph (a) as to asthma and COPD.

                  (b) In the event Revotar enters into any Licensing Transaction
            involving Products covering (i) any topical indication, or (ii) the
            asthma indication alone or the asthma and COPD indications together
            (which will include the series of Licensing Transactions described
            in the second sentence of Section 4.2.3(a)), that includes only
            countries within the European Market, and TBC is not required to
            fund a Phase III Clinical Trial to obtain FDA approval regarding the
            Product, then Revotar shall pay to TBC [*] of Revotar's royalty
            revenues relating to such Products by Revotar and its Affiliates.
            This applies to Revotar only to the royalty revenues generated out
            of the European Market as defined above .

- ----------
[*]   This information has been omitted in reliance on Rule 24B-2 under the
      Securities Exchange Act of 1934, and has been filed separately with the
      Securities and Exchange Commission.


                                       19


                  (c) In the event Revotar enters into any Licensing Transaction
            involving Products covering topical indications that includes only
            countries within the European Market, and TBC is required to fund a
            Phase III Clinical Trial to obtain FDA approval regarding the
            Product, then Revotar shall pay to TBC [*] of Revotar's royalty
            revenues relating to such Products by Revotar and its Affiliates.
            This applies to Revotar only to the royalty revenues generated out
            of the European Market as defined above.

                  (d) In the event Revotar enters into any Licensing Transaction
            involving Products covering (i) topical indications, or (ii) the
            asthma indication alone or the asthma and COPD indications together
            (which will include the series of License Transactions described in
            the second sentence of Section 4.2.3(a)), which includes the
            European Market and any other countries in the Territory (i) all
            royalties and other revenues received by Revotar for sales generated
            outside the European Market which are in excess of Development Costs
            incurred by Revotar in the development of the Product in question
            shall be shared equally by Revotar and TBC, and (ii) Revotar shall
            make payments to TBC according to subparagraphs (b) or (c) above for
            Product sales within the European Market.

                  (e) In the event Revotar enters into any Licensing Transaction
            (including a Worldwide License) not covered or described in Sections
            4.2.3(a) through (d) above, then Revotar will pay TBC [*] of
            Revotar's Product EBITDA for sales of such Products by Revotar and
            its Affiliates.

- ----------
[*]   This information has been omitted in reliance on Rule 24B-2 under the
      Securities Exchange Act of 1934, and has been filed separately with the
      Securities and Exchange Commission.


                                       20


                  (f) TBC is entitled to review and provide comments to, for a
            period not to exceed 14 days prior to execution by Revotar, any
            Licensing Transaction entered into by Revotar and a Third Party.
            Revotar may not enter into any Licensing Transaction, the terms of
            which cause TBC to incur liabilities or obligations with a Third
            Party, or agreements to indemnify or hold harmless a Third Party, of
            any type.

                  (g) Revotar and TBC shall impose on their third party
            licensees the duty to report on their Net Sales classified to the
            regions defined for TBC and Revotar.

            4.2.4 [NOT USED]

            4.2.5 REPORTS AND PAYMENT. Each party shall keep, and shall require
            all Affiliates and sublicensees to keep, accurate records in
            sufficient detail to enable the amounts due to the other party to be
            determined. Each party shall deliver to the other party within 60
            days after the end of each calendar quarter a written accounting in
            the English language, including quantities and monetary amounts of
            sales of each Product by such party and its Affiliates and
            sublicensees, on a country-by-country basis, and the amount of the
            payments, if any, due to the other party for such quarter. Each
            party or its Affiliates, simultaneously with the delivery of each
            such accounting, shall tender payment of all amounts due hereunder.
            In the event the Parties are being compensated by securities, the
            Parties may choose to compensate each other either by cash or
            securities.

      4.3   AUDIT RIGHTS. Each party shall permit the other party or its
            representatives to have access, at its own expense, no more than
            once in each calendar year during


                                       21


            the term of this Agreement and twice during the three (3) calendar
            years following the termination hereof, during regular business
            hours and upon reasonable notice, to its records and books for the
            sole purpose of determining the appropriateness of all amounts
            payable hereunder or verifying the royalties and profit sharing
            amounts payable hereunder. If such examination reveals that such
            amounts have been overstated or such royalties have been understated
            for any calendar year, such overpayment shall be promptly refunded
            or in the case of any underpayment, such party shall promptly pay
            the amount of any underpayment; provided that if such examination
            was not conducted by an independent accountant, the party whose
            records were examined shall have the right to engage an independent
            accountant reasonably acceptable to examining party to verify the
            results of such examination. Any sublicense granted by Revotar
            hereunder shall contain audit provisions as set forth in this
            Section 4.4, mutatis mutandis.

      4.4   PAYMENT CURRENCY. All payments to be made under this Agreement shall
            be made (a) if to TBC, in United States dollars and (b) if to
            Revotar, in Euros. In the case of sales in foreign currencies, the
            rate of exchange to be used in computing the amount of currency
            equivalent in United States dollars due to TBC for the calendar
            quarter just ended shall be made at the rate of exchange prevailing
            on the last day of such calendar quarter published by a New York
            money center bank designated by Revotar which Revotar uses for
            currency conversion in the preparation of Revotar financial reports.


                                       22


      4.5   PAYMENT MECHANICS. All payments under this Agreement shall be made
            by wire transfer of immediately available funds to such account as
            the receiving party shall specify or by other payment method
            acceptable to the parties.


                                       23


5. COMMERCIALIZATION.

      5.1   TBC TO MANUFACTURE. TBC has the right, but not the obligation,
            subject to the provisions of Section 2.1 above, to manufacture all
            Revotar's requirements for the Compound and/or Products, subject to
            customary forecast and order procedures. If TBC or its subcontractor
            is manufacturing the Compound and/or Products, TBC's (or its
            subcontractor's) responsibilities shall include all aspects of the
            manufacturing process, including maintenance of manufacturing
            inventory, quality control and shipment of Compound and/or Products
            in accordance with orders placed by Revotar. TBC and Revotar will
            also agree to negotiate in good faith a manufacturing agreement
            which will include provisions on forecasts, delivery time, quality
            control, quality assurance, delivery location, insurance, packaging,
            inventories, term and time of payment and such other provisions as
            are customarily included in agreements of this type. As compensation
            for such manufacturing services, TBC shall be entitled to receive
            payment of its COGS. Revotar shall have the right to audit at its
            expense the manufacturer or submanufacturer of the Compound or
            Products.

      5.2   REVOTAR AND TBC TO SELL IN TERRITORY AND NORTH AMERICA,
            RESPECTIVELY. Following regulatory approval in any country in the
            Territory or in North America, Revotar and TBC shall use
            commercially reasonable efforts to market and sell the Products in
            such country. Revotar and TBC will use all resources in such
            marketing and sales efforts that it would use regarding any of its
            other products with similar commercial potential. All terms of sale,
            including pricing policies, credit terms, cash discounts and returns
            and allowances, shall be set by


                                       24


            Revotar or TBC in their respective regions. Revotar and TBC shall be
            responsible for invoicing the customers in their respective regions
            for Products and collecting payment therefore. The Parties will
            consult each other regarding the selection of the trademarks to be
            used for the sale of Products in the Territory, which selection will
            take into account the desirability for worldwide trademarks. Such
            trademarks regarding sales of Products in the Territory will be
            owned by Revotar. In the event TBC is marketing and selling
            Products, TBC will have the right to use such trademarks outside the
            Territory at no cost to TBC.

      5.3   SUBLICENSING. If Revotar or TBC will grant a sublicense to Third
            Parties then Revotar and TBC will impose to the sublicensee to
            assume the obligations entered into by Revotar and TBC in section
            5.2, sentences 1 and 2.

6. TBC REPRESENTATIONS AND WARRANTIES.

            TBC represents and warrants to Revotar as follows:

      6.1   NO THIRD PARTY AGREEMENTS. Except for the Participation Agreement
            and the Side Letter to the Participation Agreement dated July 21,
            2000, there are no agreements with third parties relating to the
            Products.

      6.2   NO THIRD PARTY RIGHTS. TBC owns or possesses adequate licenses or
            other rights to use all patents, patent rights, inventions and
            know-how necessary for the manufacture, use and sale of the Compound
            and Products and to grant the licenses granted herein. To the best
            knowledge of TBC, the manufacture, use or sale of the Products and
            Compound pursuant to this Agreement will not infringe or conflict
            with any Third Party right or patent and TBC is not aware of any
            pending patent


                                       25


            application that if issued would be infringed by the manufacture,
            use or sale of the Products pursuant to this Agreement. TBC has not
            received any notice from a third party that any manufacture, use or
            sale of the Products and Compound pursuant to this Agreement
            infringes or conflicts with any Third party right or patent.


                                       26


7. PROPRIETARY RIGHTS.

      7.1   IMPROVEMENTS. Improvements conceived or made solely by the employees
            of either party during the term of this Agreement shall be the sole
            property of such party. Improvements made jointly by employees of
            both parties during the term of this Agreement shall be owned by
            Revotar. All Improvements no matter if conceived solely by one party
            to this Agreement or jointly shall be automatically included in the
            license granted to Revotar under Section 2; provided, that the
            parties agree to negotiate in good faith appropriate modifications
            to the terms of this Agreement which reflect the fact that an
            Improvement has been jointly developed or developed only by TBC.
            Each party shall promptly disclose to the other any Improvements
            developed by its employees or agents acting on its behalf. Each
            party agrees that all employees and other persons acting on its
            behalf under this Agreement shall be obligated under a binding
            written agreement to assign (or exclusively license in the case of
            academics) to such party or as such party shall direct all
            Improvements made or conceived by such employee or other person.

            New Chemical Entities, including Compound follow-up molecules
            discovered by Revotar will be the exclusive intellectual property of
            Revotar. TBC agrees to waive patent infringement litigation against
            Revotar related to such discoveries.

      7.2   PATENT PROSECUTION AND MAINTENANCE. The parties agree that they will
            coordinate with each other in all reasonable respects the worldwide
            prosecution of the Patents, subject to the provisions of this
            Section 7. TBC shall be responsible,


                                       27


            at its expense, for prosecuting and maintaining any patents and
            patent applications relating to the Patents in existence on the date
            of the License Agreement. Revotar shall be responsible, at its
            expense, for filing, prosecuting and maintaining the Patents to the
            extent they are not in existence on the date of the License
            Agreement (including Improvements owned by Revotar or jointly
            developed by Revotar and TBC, but excluding Improvements owned
            exclusively by TBC). Each party shall furnish the other party with
            copies of any patent application concerning Subject Technology or
            Improvements sufficiently in advance of the anticipated filing date
            (but in no event less than 5 working days before filing) so as to
            give the other party a reasonable opportunity to review and comment.
            Each party shall also furnish copies to the other party of all
            communications to and from United States and foreign patent offices
            regarding patents or patent applications relating to this Agreement
            within a reasonable time prior to filing such communication or
            promptly following the receipt thereof. Each party shall reasonably
            consider any comments the other party may have related to such
            patent applications or communications. Each party shall have the
            right at its expense to file, prosecute and maintain patents in the
            United States and all foreign countries on Improvements owned solely
            by it. Notwithstanding the foregoing, beyond best efforts, neither
            party assumes liability to the other for the successful prosecution
            of any patent application. However, if either party shall fail to
            pay an annuity, tax or other maintenance fee with respect to a
            Patent or Patent application or otherwise decide not to pursue a
            Patent relating to Improvements owned solely by


                                       28


            it, it shall give the other party timely notice and the opportunity
            to take such action and assume all ownership rights to such Patent
            or Patent application.

      7.3   THIRD PARTY CLAIM OF INFRINGEMENT. Each party shall give the other
            prompt notice of each claim or allegation that the exercise of
            rights hereunder constitutes an infringement of one or more patents
            or other rights of a Third Party. Revotar shall use all commercially
            reasonable efforts to defend the parties against any such claim or
            allegation with counsel of its own choice reasonably acceptable to
            Revotar. The costs of such defense and any costs of settling or
            otherwise satisfying such claim (including damage awards, if any)
            shall be borne as follows:

            7.3.1 TBC COSTS. TBC shall bear all costs associated with claims
            based on any patent issued or patent application published as of the
            date of the License Agreement. If Revotar continues to sell the
            Products following notice of such claim against explicit requests to
            the contrary by TBC, then Revotar shall have the obligation to
            satisfy all claims in connection with such continued sales activity.
            At all times, Revotar shall have the right to defend itself at its
            cost against this with counsel of its own choice reasonably
            acceptable to TBC.

            7.3.2 REVOTAR COSTS. Revotar shall bear all costs associated with
            claims based on any patent or patent application that was not issued
            or published as of the date of the License Agreement.

            7.3.3 COOPERATION. Each party agrees to cooperate with the other in
            the defense of any such claim or allegation, including, to the
            extent able, furnishing testimony by its employees and providing
            technical support and information as requested. Neither party shall
            settle or discontinue defense of any such case without the


                                       29


            other's prior written consent, which shall not be unreasonably
            withheld. In the case of any proposed settlement involving a
            cross-license with a Third Party, neither party may unreasonably
            refuse to enter into such a cross-license. The provisions of this
            Section 7.3 shall also apply to actions for declaratory relief which
            raise or are in response to an issue of infringement of a Third
            Party patent.

      7.4   INFRINGEMENT BY THIRD PARTIES. Each party shall give the other party
            prompt written notice of any incident of infringement of Patents
            that comes to its attention. The parties shall thereupon confer as
            to what steps are to be taken to stop or prevent such infringement.
            Revotar agrees to use reasonable efforts to stop any such
            infringement, but shall not be obligated to commence proceedings
            against the infringer. If Revotar decides to commence proceedings,
            however, Revotar shall be responsible for any legal costs incurred
            and will be entitled to retain any settlement or damage award
            received, and TBC agrees to cooperate with Revotar in such
            proceeding. TBC shall have the right at its expense to engage its
            own counsel in connection with such proceedings. Should Revotar
            decide not to commence proceedings, and should the infringement
            represent a substantial threat to the commercial value of any
            Products, TBC shall be entitled (but not obligated) to do so in its
            own name and/or in Revotar's name against the infringer, in which
            event TBC shall be responsible for all legal costs incurred, and
            will be entitled to retain any settlement or damage award received,
            and Revotar agrees to cooperate with TBC in such proceedings and
            Revotar shall have the right at its expense to engage its own
            counsel in connection with such proceedings.


                                       30


8. CONFIDENTIALITY.

      8.1   GENERAL. Any party receiving Confidential Information pursuant to
            this Agreement shall maintain the confidential and proprietary
            status of such Confidential Information, keep such Confidential
            Information and each part thereof within its possession or under its
            control sufficient to prevent any activity with respect to the
            Confidential Information that is not specifically authorized by this
            Agreement and prevent the disclosure of any Confidential Information
            to any Third Party using the same degree of care it would use with
            respect to its own information of like importance; provided,
            however, that such restrictions shall not apply to any Confidential
            Information that is (a) independently developed outside the scope of
            this Agreement by employees of the receiving party having no access
            to or knowledge of the Confidential Information disclosed hereunder,
            (b) in the public domain at the time of its receipt or thereafter
            becomes part of the public domain through no fault of the receiving
            party, (c) lawfully received without an obligation of
            confidentiality from a Third Party having the right to disclose such
            information, (d) released from the restrictions of this Section 8 by
            the express written consent of the disclosing party, (e) disclosed
            to any permitted assignee, sublicensee or subcontractor or customer
            of Revotar or TBC, provided that such assignee, sublicensee,
            subcontractor or customer is subject to the provisions of this
            Section 8 or substantially similar provisions or (f) required by
            law, statute, rule or court order to be disclosed, including
            requirements of the Securities and Exchange Commission, the FDA, any
            PRA, and other regulatory authorities, provided that the disclosing
            party uses commercially reasonable efforts to obtain


                                       31


            confidential treatment of any such disclosure. Without limiting the
            generality of the foregoing, Revotar and TBC each shall use all
            commercially reasonable efforts to obtain, if not already in place,
            confidentiality agreements from its respective relevant employees
            and agents, to protect the Confidential Information as herein
            provided.

      8.2   DISCLOSURE OF AGREEMENT. Neither party shall make a public
            announcement or otherwise disclose the terms of this Agreement to
            any Third Party without the prior written consent of the other
            except that the parties may without such consent disclose (a) the
            existence of this Agreement, (b) the identity of the other party and
            (c) the general subject matter of this Agreement. Notwithstanding
            the foregoing statement, both parties may disclose details of this
            agreement to third parties, pursuant to a confidentiality agreement,
            for the purpose of business negotiations with potential licensees,
            financial investors, financial advisors, patent attorneys and
            governmental agencies.

            Each party shall also be permitted to make such disclosure of the
            terms of this Agreement as its counsel reasonably determines is
            necessary to comply with law, provided that such party shall use
            commercially reasonable efforts to obtain confidential treatment of
            any such disclosure.


                                       32


9. INDEMNIFICATION.

      9.1   MUTUAL RIGHT TO INDEMNIFICATION. Each party shall defend, indemnify
            and hold harmless the other and its directors, officers, employees
            and agents from and against any and all claims, liabilities, losses
            and expenses, including attorneys' fees, incurred by or asserted
            against it or any of the foregoing arising out of the development,
            testing, manufacture, handling or storage of any Product by such
            party, including without limitation (i) any actual or alleged bodily
            injury, death or property damage resulting from the use of any
            Product manufactured by such party, (ii) any actual or alleged
            violation of law applicable to the development, testing,
            manufacture, handling or storage of the Products by such party and
            (iii) any Product recall of Product manufactured by such party that
            is ordered by a governmental agency or required by a confirmed
            Product failure as reasonably determined by the parties, except as
            otherwise provided herein and except to the extent that such
            liabilities, losses and expenses result from the negligence or
            willful misconduct of a party, in which case the party who engaged
            in such negligence or willful misconduct shall indemnify and hold
            harmless the other party and its directors, officers, employees and
            agents. Each party shall defend, indemnify and hold harmless the
            other party and its directors, officers, employees and agents from
            and against any and all claims, liabilities, losses and expenses,
            including attorneys' fees, incurred by or asserted against the other
            party or any of the foregoing arising out of a misrepresentation
            regarding any sales of Products by such party, it Affiliates or
            sublicensees which is not in accordance with


                                       33


            approved Product claims.

      9.2   PROCEDURE. Any person that intends to claim indemnification under
            this Section 9 (an "Indemnitee") shall promptly notify the other
            party (the "Indemnitor") of any claim, in respect of which the
            Indemnitee intends to claim such indemnification, and the Indemnitor
            shall assume the defense thereof with counsel mutually satisfactory
            to the parties; provided, however, that an Indemnitee shall have the
            right to retain its own counsel, with the fees and expenses to be
            paid by the Indemnitor, if representation of such Indemnitee by the
            counsel retained by the Indemnitor would be inappropriate due to
            actual or potential differing interests between such Indemnitee and
            any other party represented by such counsel in such proceedings. The
            indemnity agreement in this Section 9 shall not apply to amounts
            paid in settlement of any loss, claim, liability or action if such
            settlement is effected without the consent of the Indemnitor, which
            consent shall not be withheld unreasonably. The failure to deliver
            notice to the Indemnitor within a reasonable time after the
            commencement of any such action, if prejudicial to its ability to
            defend such action, shall relieve such Indemnitor of any liability
            to the Indemnitee under this Section 9, but not any liability that
            it may have to any Indemnitee otherwise than under this Section 9.
            The Indemnitee and its employees and agents shall cooperate fully
            with the Indemnitor and its legal representatives in the
            investigation of any action, claim or liability covered by this
            indemnification. In the event that each party claims indemnity from
            the other and one party is finally held liable to indemnify the
            other, the Indemnitor shall additionally be liable to pay the
            reasonable legal costs


                                       34


            and attorneys' fees incurred by the Indemnitee in establishing its
            claim for indemnity.

      9.3   PRODUCT LIABILITY INSURANCE. Each party shall use all commercially
            reasonable efforts to maintain product liability insurance with
            respect to its manufacture and sale of the Products hereunder. Such
            insurance shall be in such amounts and subject to such deductibles
            as the parties may agree based upon standards prevailing in the
            industry at the time such manufacturing commences. At such time as a
            Product is being launched by a party for commercial sale, the
            parties shall attempt to maximize the product liability insurance
            coverage for both parties. TBC shall maintain such insurance for so
            long as Revotar continues to sell any Product manufactured by TBC,
            and thereafter for so long as TBC maintains insurance for itself
            covering such manufacture or sales. Revotar shall maintain such
            insurance for as long as Revotar continues to sell any Product
            pursuant to this Agreement manufactured by it, and thereafter for so
            long as Revotar maintains insurance for itself covering such
            manufacture or sales.

10. TERM AND TERMINATION.

      10.1  LICENSE TERM. The obligations of Revotar under the license granted
            in section 2 shall terminate on a country by country and Product
            formulation by Product formulation basis upon the legal sale by a
            Third Party of a generic version of TBC1269 for that particular
            formulation in that particular country. Thereafter, Revotar shall
            have a license to and perpetual rights in such Patents and Subject
            Technology in such country as to the Product or Compound in
            question.


                                       35


      10.2  TERMINATION FOR BREACH. Either party may terminate this Agreement by
            written notice to the other in the event that (i) the other party
            fails to perform any material obligation hereunder and such failure
            is not cured within 60 days following prompt notice thereof from the
            non-defaulting party, or (ii) any bankruptcy, receivership,
            insolvency or bankruptcy reorganization proceedings are instituted
            by the other party or any such proceedings are instituted against
            the other party and not dismissed within 120 days. The bankruptcy of
            a party shall not give rise to the right of the bankrupt party to
            terminate any license granted herein.

      10.3  TERMINATION FOR FAILURE TO PROCEED.

            Regarding the asthma indication, if more than 18 months lapse
            between the last patient completing treatment in a clinical trial
            for asthma conducted by Revotar and (i) enrollment of the next
            patient in a new clinical trial for asthma conducted by Revotar, or
            (ii) the submission of a marketing application for asthma to the
            EMEA or any country within the European Union by Revotar or (iii)
            entering into a license(s) agreement(s) between Revotar and a Third
            Party covering the asthma indication in at least the European
            Market, Japan and/or North America market, then the license will
            terminate for asthma. In the event that Revotar has entered into a
            license agreement for Japan, an additional 6 months will be added to
            the 18 month lapse period. Revotar must assure that adequate due
            diligence provisions obligate its licensee(s) to timely conduct
            clinical development and regulatory submissions. In case of breach
            of contract by the licensee(s), the license will revert to Revotar
            and Revotar will reassume the obligations as the licensee of TBC as
            stated in this Agreement.


                                       36


            Regarding the topical indications, if more than 18 months lapse
            between the last patient completing treatment in a clinical trial
            for a topical indication conducted by Revotar and (i) enrollment of
            the next patient in a new clinical trial for a topical indication
            conducted by Revotar, or (ii) the submission of a marketing
            application for a topical indication to the EMEA or any country
            within the European Union by Revotar or (iii) entering into a
            license(s) agreement(s) between Revotar and a Third Party covering
            the topical indications in at least the European Market and/or
            Japan, then the license will terminate for the topical indications.
            Revotar must assure that adequate due diligence provisions obligate
            its licensee(s) to timely conduct clinical development and
            regulatory submissions. In case of breach of contract by the
            licensee(s), the license will revert to Revotar and Revotar will
            reassume the obligations as the licensee of TBC as stated in this
            Agreement

            Regarding TBC's obligations for developing the topical indications,
            following provision by Revotar to TBC of a Phase II package, as
            defined in APPENDIX 2, TBC's rights in North America with respect to
            the topical indications shall revert to Revotar upon the occurrence
            of any of the following: (i) more than 36 months lapses between the
            receipt of the Phase II package and the initiation of a Phase III
            clinical trial for a topical indication in North America by TBC and
            TBC has not entered into a license(s) covering a topical indication
            within North America within 36 months of receipt of the Phase II
            package, or (ii) more than 36 months lapses between the last patient
            completing treatment in a clinical trial for a topical


                                       37


            indication conducted by TBC and the enrollment of the next patient
            in a new clinical trial for a topical indication (except where TBC
            has submitted a regulatory approval dossier in any country within
            North America) and TBC has not entered into a license(s) covering a
            topical indication within North America. TBC must assure that
            adequate due diligence provisions obligate its licensee(s) to timely
            conduct clinical development and regulatory submissions.

      10.4  SURVIVAL OF OBLIGATIONS. No termination of this Agreement shall
            eliminate any rights and obligations accrued prior to such
            termination. Promptly following any termination of this Agreement,
            each party shall return all written materials containing
            Confidential Information, except one copy that may be retained by
            counsel for each of the parties for record keeping purposes only.
            The provisions of Sections 7.3, 9, 10.4, 11.6 and 11.7 shall survive
            any termination of this Agreement. The provisions of Section 8 shall
            survive until five years after the expiration of the license as to
            all of the Products.

11. MISCELLANEOUS.

      11.1  FORCE MAJEURE. Each Party shall be excused for any failure or delay
            in performing any of its obligations under this Agreement, if such
            failure or delay is caused by Force Majeure. For purposes of this
            Agreement, "Force Majeure" shall mean any act of God, accident,
            explosion, fire, storm, earthquake, flood, drought, riot, embargo,
            civil commotion, war, act of war or any other circumstances or event
            beyond the reasonable control of the party relying upon such
            circumstance or event.


                                       38


      11.2  RELATIONSHIP OF THE PARTIES. The parties agree that each is acting
            as an independent contractor with respect to the other and nothing
            contained in this Agreement is intended, or is to be construed, to
            constitute Revotar and TBC as partners or joint venturers or TBC an
            agent of Revotar. Neither party hereto shall have any express or
            implied right or authority to assume or create any obligations on
            behalf of or in the name of the other party or to bind the other
            party to any contract, agreement or undertaking.

      11.3  NOTICES. Any notice or other communication hereunder shall be in
            writing and shall be deemed given when so delivered in person, by
            overnight courier (with receipt confirmed) or by facsimile
            transmission (with receipt confirmed by telephone or by automatic
            transmission report) or on the tenth business day after being sent
            by registered or certified mail (postage prepaid, return receipt
            requested), as follows (or to such other person's address as may be
            specified in writing to the other party hereto):

            Texas Biotechnology Corporation
            7000 Fannin, 20th Floor
            Houston, Texas 77030
            Attention: President
            Facsimile: (713) 796-8232

            Revotar Biopharmaceuticals AG
            Attention: President
            Neuendorfstrasse 24a
            16761 Hennigsdorf
            Germany
            Facsimile: +49 3302 202 5011

      11.4  SUCCESSORS AND ASSIGNS. The terms and provisions of this Agreement
            shall inure to the benefit of, and be binding upon, Revotar, TBC,
            and their respective


                                       39


            successors (including a successor pursuant to a merger of a party
            hereto) and assigns. This Agreement, or any of the rights granted
            hereunder, may be assigned by Revotar or TBC to any of their
            respective Affiliates; provided, that such assignment expressly
            provides that the assignor remains liable for its obligations
            hereunder and the performance of its Affiliate under this Agreement.

      11.5  AMENDMENTS AND WAIVERS. No amendment, modification, waiver,
            termination or discharge of any provision of this Agreement, nor
            consent to any departure by Revotar or TBC therefrom, shall in any
            event be effective unless the same shall be in writing specifically
            identifying this Agreement and the provision intended to be amended,
            modified, waived, terminated or discharged and signed by the party
            against whom enforcement of such amendment is sought, and each
            amendment, modification, waiver, termination or discharge shall be
            effective only in the specific instance and for the specific purpose
            for which given. No provision of this Agreement shall be varied,
            contradicted or explained by any oral agreement, course of dealing
            or performance or any other matter not set forth in an agreement in
            writing and signed by the party against whom enforcement of such
            variance, contradiction or explanation is sought.

      11.6  GOVERNING LAW. This Agreement shall be governed by and construed in
            accordance with the laws of the Federal Republic of Germany.

      11.7  DISPUTE RESOLUTION

            11.7.1 The parties agree to effect all reasonable efforts to resolve
            any and all disputes between them in connection with this Agreement
            in an amicable manner. The parties agree that any dispute that
            arises in connection with this Agreement


                                       40


            and which cannot be amicably resolved by the parties shall be
            resolved by binding Alternative Dispute Resolution (ADR) in the
            manner set forth in the following Section 11.7.2

            11.7.2 All disputes arising in connection with this Agreement or its
            validity which cannot be amicably resolved by the parties shall be
            finally settled in accordance with the Arbitration Rules of the
            German Institution of Arbitration e.V. (DIS) without recourse to the
            ordinary courts of law if not agreed otherwise in this section
            11.7.2.

                  The place of arbitration shall be Berlin. The language of the
            arbitral proceedings shall be English.

                  The arbitral tribunal shall consist of a single neutral
            individual selected according to the following subsection.

                  If a party intends to begin ADR to resolve a dispute, such
            party shall provide written notice to the other party informing the
            other party of such intention and the issues to be resolved. Within
            ten (10) business days after its receipt of such notice, the other
            party may, by written notice to the party initiating ADR, add
            additional issues to be resolved. If the parties cannot agree upon
            the selection of a neutral within twenty (20) business days
            following receipt of the original ADR notice, a neutral shall be
            selected by the then President ("Vorstandsvorsitzender") of the
            German Institution of Arbitration (D.I.S.), Bonn. The neutral shall
            be a single individual having relevant experience in the
            pharmaceutical industry. The neutral selected shall not be an
            employee, director or shareholder of either party or of an
            Affiliate. Each party shall have ten (10)


                                       41


            business days from the date the neutral is selected to object in
            good faith to the selection of that person. If either party makes
            such an objection, the then President of the DIS shall, as soon as
            possible thereafter, select another neutral under the same
            conditions as set forth above.

      11.8  SEVERABILITY. If any provision hereof should be held invalid,
            illegal or unenforceable in any respect in any jurisdiction, then,
            to the fullest extent permitted by law, (a) all other provisions
            hereof shall remain in full force and effect in such jurisdiction
            and shall be liberally construed in order to carry out the
            intentions of the parties hereto as nearly as may be possible and
            (b) such invalidity, illegality or unenforceability shall not affect
            the validity, legality or enforceability of such provision in any
            other jurisdiction.

      11.9  HEADINGS. Headings used herein are for convenience only and shall
            not in any way affect the construction of, or be taken into
            consideration in interpreting, this Agreement.

      11.10 EXECUTION IN COUNTERPARTS. This Agreement may be executed in any
            number of counterparts, each of which counterparts, when so executed
            and delivered, shall be deemed to be an original, and all of which
            counterparts, taken together, shall constitute one and the same
            instrument.

      11.11 ENTIRE AGREEMENT. This Agreement and the Research Agreement, as
            amended and attached hereto, contains the entire agreement and
            understanding of the parties hereto, and supersedes any prior
            agreements or understandings between the parties with respect to the
            subject matter hereof.


                                       42


      IN WITNESS HEREOF, the parties hereto have caused this Agreement to be
duly executed on this 24th day of January, 2003.


                             TEXAS BIOTECHNOLOGY CORPORATION

                             By: /s/ Dr. Bruce D. Given
                                ------------------------------------------------

                             Title: President and CEO
                                   ---------------------------------------------


                             REVOTAR BIOPHARMACEUTICALS AG

                             By: /s/ Dr. Gunter Rosskamp
                                ------------------------------------------------

                             Title: CEO
                                   ---------------------------------------------


                                       43