CONFIDENTIAL TREATMENT REQUESTED FOR ALL BRACKETED ([]) INFORMATION. THE
CONFIDENTIAL PORTION HAS BEEN SO OMITTED AND FILED SEPARATELY WITH THE
COMMISSION.

                             MANUFACTURING AGREEMENT

               This Manufacturing Agreement (hereinafter the "Agreement"), made
and effective as of the 15th day of May, 1994, by and between Merck & Co., Inc.,
a corporation incorporated under the laws of the State of New Jersey, U.S.A.,
having its office at One Merck Drive, Whitehouse Station, New Jersey 08889,
U.S.A. (hereinafter referred to as "MERCK") and Koffolk, Ltd. and Philipp
Brothers Chemicals, Inc., companies organized and existing under the laws of
Israel and New York, respectively and having offices at P. 0. Box 1098, 61010
Tel Aviv, Israel and One Parker Plaza, Fort Lee, New Jersey 07024, U.S.A.,
respectively (hereinafter collectively referred to as "KOFFOLK').

                                   WITNESSETH:

               WHEREAS, KOFFOLK has experience MANUFACTURING quantities of
Amprolium; and

               WHEREAS, MERCK desires to engage the facilities and services of
KOFFOLK to MANUFACTURE, as defined below, for MERCK; and

               WHEREAS, KOFFOLK is willing to undertake MANUFACTURE of the
PRODUCT, as defined below, for MERCK in accordance with the terms and conditions
set forth herein.

               NOW, THEREFORE, in consideration of the foregoing premises and of
the mutual covenants of the parties hereinafter set forth, the parties hereto
agree as follows:

               The following terms are used in this Agreement and shall have the
meanings set forth in this Section:

1.1     The term "PRODUCT" shall mean Amprolium, which is to be MANUFACTURED in
        strict accordance with current GOOD MANUFACTURING PRACTICES and the
        KNOW-HOW, defined below, which is to meet the specifications set forth
        in Schedule A and which is to be packaged as set forth in Schedule B.
        Schedule A may be modified from time to time by MERCK in consultation
        with KOFFOLK

1.2     The term "MANUFACTURE/MANUFACTURING/MANUFACTURED" except as may
        otherwise be agreed in writing by the parties hereto, shall mean all
        operations in the production, packaging, quality control testing and
        storage of the PRODUCT and storage of all raw materials and packaging
        components for PRODUCT.

1.3     The term "KNOW-HOW' shall mean information and data which MERCK has
        determined to be necessary to MANUFACTURE the PRODUCT, whenever
        disclosed to KOFFOLK, including but not limited to the information
        contained in the designated binders referred to as "Technical Know-How
        Package" listed in Schedule C, which may be modified by MERCK at any
        time. "KNOW-HOW' is covered within the definition of "INFORMATION" in
        Section 3.1 below and is subject to the terms of that Section.

1.4     The term "AGENCY" shall mean any applicable Israeli government
        regulatory authority involved in granting approvals for the
        MANUFACTURING of the PRODUCT in Israel.

1.5     The term "CALENDAR QUARTER" shall mean the period of each three
        consecutive calendar months ending on March 31, June 30, September 30 or
        December 31, as the case may be.








1.6     The term "CALENDAR YEAR" shall mean the period from January 1 through
        December 31 in a given year.

1.7     The term "AFFILIATE" shall mean (i) any corporation, company or other
        business entity, fifty percent (50%) or more of the voting stock of
        which is owned directly or indirectly by MERCK or KOFFOLK, (ii) any
        corporation, company or business entity, which owns, directly or
        indirectly, fifty percent (50%) or more of the voting stock of MERCK or
        KOFFOLK or (iii) any corporation, company or other business entity under
        the direct or indirect control of a corporation, company or business
        entity described in (i) or (ii).

1.8     The term "FACILITY" shall mean KOFFOLK's facility located at Plant 04,
        Ramat Chovav, Israel, and all KOFFOLK facilities at that location used
        for the MANUFACTURING and storage of PRODUCT, raw materials and
        packaging components.

1.9     "IMMEDIATE/IMMEDIATELY" shall mean within forty-eight (48) hours.

1.10    "PROMPT/PROMPTLY' shall mean within thirty (30) days.

1.11    The term "current GOOD MANUFACTURING PRACTICES" shall mean all laws and
        regulations which have jurisdiction over the MANUFACTURE of the PRODUCT
        at the time of MANUFACTURE, including but not limited to the Good
        Manufacturing Practices as specified in the United States Code of
        Federal Regulations, the EEC Good Manufacturing Guidelines and any other
        applicable laws, guidelines and/or regulations.

1.12    The term "INTERMEDIATES" shall mean isolated chemical compounds in the
        MANUFACTURE of the PRODUCT as stated in the KNOW-HOW.

2.      APPOINTMENTS

2.1     (a)    MERCK hereby appoints KOFFOLK to act for and on behalf of MERCK
               to MANUFACTURE the PRODUCT at KOFFOLK's FACILITY subject to the
               conditions and terms set forth herein, and KOFFOLK accepts such
               appointment to MANUFACTURE the PRODUCT and to do such other acts
               as are herein authorized. All PRODUCT MANUFACTURED in accordance
               with this Agreement shall be the exclusive property of MERCK and
               shall be supplied to MERCK or any person or entity that MERCK
               shall designate in writing.

        (b)    During the term of this Agreement: (i) KOFFOLK shall not use the
               KNOW-HOW or any other information, data or material provided by
               MERCK hereunder or in connection with this Agreement, either in
               whole or part, for any purpose other than to MANUFACTURE PRODUCT
               for MERCK hereunder and (ii) KOFFOLK shall not sell or otherwise
               provide PRODUCT or any material made using any KNOW-HOW to anyone
               except MERCK, provided that KOFFOLK may sell INTERMEDIATES to a
               third party who shall agree to refrain from using such
               INTERMEDIATES to produce any product containing Amprolium and
               from providing such INTERMEDIATES to anyone else for such use.

        (c)    Upon termination or natural expiration of this Agreement, and
               continuing for the duration of KOFFOLK's obligations of
               confidentiality and non-use set forth in Section 3 below and in
               the Confidentiality Agreement referred to in Section 3.1(h)
               below, KOFFOLK shall cease using the KNOW-HOW for any purpose,
               unless otherwise agreed to in writing by MERCK.

2.2     The appointment of KOFFOLK to MANUFACTURE is exclusive for the PRODUCT.
        However, MERCK 


                                       2




        shall be able to (i) manufacture PRODUCT itself up to January 1, 1996,
        and (ii) make other arrangements for the manufacture of PRODUCT if at
        any time KOFFOLK is unable to fill orders placed by MERCK under Section
        7 below for three (3) consecutive months. Also, this Agreement has no
        effect on MERCK's right to sell its inventory of Amprolium.

2.3     (a)    The parties agree to comply with all laws and regulations of any
               regulatory authority necessary for MANUFACTURING of PRODUCT.
               KOFFOLK shall be responsible for obtaining all the necessary
               permits and licenses for the MANUFACTURE of PRODUCT. KOFFOLK
               agrees to prepare and file Type I and Type II Drug Master Files
               with the U. S. Food and Drug Administration to allow for the sale
               of PRODUCT in the U.S. MERCK will provide reasonable assistance
               to KOFFOLK in the preparation of the Type I and II Drug Master
               Files. KOFFOLK shall also undertake any actions to keep those
               Drug Master Files updated. KOFFOLK will fully cooperate with
               MERCK in connection with any filings that MERCK makes with
               regulatory authorities outside of the United States relating to
               the PRODUCT. KOFFOLK agrees to comply with all applicable
               regulations in order to allow for sale of PRODUCT in any market
               in which it may be sold.

        (b)    During the term of this Agreement KOFFOLK agrees to permit MERCK
               to reference those Drug Master Files in connection with MERCK's
               filing of any supplement with the FDA, or as otherwise needed by
               MERCK.

        (c)    During the term of this Agreement and thereafter KOFFOLK shall
               not permit anyone other than MERCK to reference or otherwise use
               the Type II Drug Master Files referred to in Section 2.3(a) above
               without the prior written consent of MERCK

2.4     The obligations of MERCK hereunder may be fulfilled either by MERCK or
        an AFFILIATE.

3.      CONFIDENTIALITY

3.1     KOFFOLK agrees that any and all KNOW-HOW or other information or data,
        whether written, graphic or oral which may be provided by MERCK to
        KOFFOLK (including any analysis, materials, product or conclusions drawn
        or derived therefrom) or which may be derived from or related to any
        visits by KOFFOLK personnel to MERCK or may be otherwise known to
        KOFFOLK through its visits or contact with MERCK (hereinafter
        individually and collectively referred to as"INFORMATION") shall be
        disclosed by MERCK and used by KOFFOLK subject to the following terms
        and conditions:

        (a)    KOFFOLK shall keep all INFORMATION in confidence and will not,
               without MERCK's prior written consent, disclose said INFORMATION
               to any person or entity, except those of KOFFOLK's officers and
               employees who directly require said INFORMATION for fulfillment
               of the purpose of this Agreement. Each officer or employee to
               whom INFORMATION is to be disclosed shall be advised by KOFFOLK
               of, and be bound by the terms of this Agreement. KOFFOLK shall
               take all reasonable precautions to prevent INFORMATION from being
               disclosed to any unauthorized person or entity.

        (b)    KOFFOLK shall not use, either directly or indirectly, any
               INFORMATION for any purpose other than to MANUFACTURE PRODUCT for
               MERCK hereunder without MERCK's prior written consent.

        (c)    KOFFOLK's obligations of confidentiality set forth herein shall
               not apply to any INFORMATION which is: 
               (i)     possessed by KOFFOLK prior to receipt from MERCK, other 
                       than through prior disclosure by MERCK, as evidenced by 
                       KOFFOLK's written records;


                                        3





               (ii)    published or available to the general public other than 
                       through a breach of this Agreement or other obligation of
                       confidentiality by KOFFOLK; or

               (iii)   obtained by KOFFOLK from a third party with a valid
                       right to disclose such INFORMATION, provided that
                       said third party is not under a confidentiality
                       obligation to MERCK or the disclosing party if other
                       than MERCK.

               Any combination of features or disclosures shall not be deemed to
               fall within the foregoing exclusions merely because individual
               features are published or available to the general public or in
               the rightful possession of KOFFOLK unless the combination itself
               and principle of operation are published or available to the
               general public or in the rightful possession of KOFFOLK.

        (d)    All INFORMATION, without limitation, shall remain the personal
               and proprietary property of MERCK. KOFFOLK shall not acquire any
               license or other intellectual property interest in any
               INFORMATION disclosed to it by MERCK. Further, disclosure of
               INFORMATION shall not result in any obligation to grant KOFFOLK
               any right in and to said INFORMATION.

        (e)    Any and all discoveries and/or inventions by KOFFOLK, whether or
               not patentable, resulting from KOFFOLK's use of INFORMATION shall
               be the sole and exclusive property of MERCK. Within thirty (30)
               calendar days of any discovery or invention, KOFFOLK shall notify
               MERCK, in writing, of the event and shall assist MERCK in
               protecting MERCK's proprietary rights to said discovery or
               invention.

        (f)    Upon request by MERCK, KOFFOLK shall immediately return to MERCK
               all INFORMATION, all notes which may have been made regarding the
               INFORMATION, and all copies thereof, except that KOFFOLK may
               retain one copy of each item of INFORMATION provided that said
               copy shall be retained and used solely for compliance purposes
               and shall be held in KOFFOLK's confidential legal files.

        (g)    In the event that KOFFOLK is required by judicial or
               administrative process to disclose any or all of the INFORMATION,
               KOFFOLK shall promptly notify MERCK and allow MERCK a reasonable
               time to oppose such process before disclosing any INFORMATION.

        (h)    The obligations of confidentiality and non-use created herein
               shall be binding upon KOFFOLK, its successors and assigns with
               respect to each successive disclosure of INFORMATION and, with
               respect to each disclosure, shall continue for fifteen (15) years
               from the date of said disclosure. The obligations of
               confidentiality and non-use under the Confidentiality Agreement
               between the parties last dated September 6, 1993 shall also
               continue for fifteen (15) years from the date of any disclosure
               under that Confidentiality Agreement.

4.      FACILITY

4.1     KOFFOLK hereby undertakes to MANUFACTURE PRODUCT at its FACILITY and
        store raw materials and packaging components at that FACILITY. The
        Facility shall meet current GOOD MANUFACTURING PRACTICES. KOFFOLK shall
        not change the location at which it MANUFACTURES PRODUCT without the
        prior written approval of MERCK. KOFFOLK may change the location at
        which it stores raw materials and packaging components provided that any
        such storage location meets current GOOD MANUFACTURING PRACTICES.

5.      EQUIPMENT

5.1     KOFFOLK agrees, at its cost, to operate the FACILITY and all equipment
        and machinery used, directly or 


                                        4





        indirectly, to MANUFACTURE PRODUCT in accordance with current GOOD
        MANUFACTURING PRACTICES and in accordance with applicable regulatory
        agency requirements, and to maintain said FACILITY, equipment and
        machinery in an acceptable state of repair and operating efficiency so
        as to meet specifications as set forth in Schedule A and the KNOW-HOW
        and all regulatory requirements. KOFFOLK will be responsible for
        validating the equipment and all processes and procedures involving
        production, cleaning, packaging and any other appropriate steps
        performed at the FACILITY. Such validation by KOFFOLK must meet the
        validation criteria set forth in the KNOW-HOW and all applicable
        regulatory requirements and receive all required regulatory approvals.

5.2     During the term of this Agreement, the FACILITY shall be dedicated
        solely to MANUFACTURING PRODUCT. However, if under Section 7.1 below
        MERCK places binding orders in any CALENDAR YEAR for less than [       
              ] of PRODUCT, KOFFOLK shall have the option to use the FACILITY to
        manufacture another product provided (i) KOFFOLK may not manufacture any
        other product without providing written notice to MERCK in advance in
        order to permit MERCK to consider any potential question of
        cross-contamination; (ii) if MERCK identifies a potential problem of
        cross-contamination, the parties will meet to attempt to resolve the
        problem and (iii) KOFFOLK shall not manufacture any product in the
        FACILITY which MERCK considers to present cross-contamination problems.
        KOFFOLK will supply MERCK PROMPTLY with a copy of all governmental
        and/or regulatory submissions associated with the FACILITY. KOFFOLK will
        IMMEDIATELY notify MERCK in the event that it becomes aware of any risks
        of contamination associated with MANUFACTURING PRODUCT at the FACILITY.

6.      SUPPLY OF MATERIALS

6.1     KOFFOLK shall purchase all necessary raw materials and packaging
        components in adequate quantities which are required for MANUFACTURING
        and shipping the PRODUCT and shall perform all quality control testing
        on those raw materials and packaging components as set forth in the
        KNOW-HOW. All such packaging components and raw materials shall meet the
        requirements set forth in Schedule B and the KNOW-HOW, respectively.
        MERCK reserves the right to approve all raw materials and packaging
        components and shall not unreasonably withhold such approval. For the
        purpose of approval by MERCK, KOFFOLK will also inform MERCK in writing
        prior to any changes to sources of supply. KOFFOLK warrants that all
        packaging components and raw materials supplied hereunder shall meet the
        requirements of Schedule B and the KNOW-HOW, respectively, and of the
        applicable regulatory agencies relative to such components and
        materials.

7       FORECASTING, PLACING AND SCHEDULING OF ORDERS

7.1     In order that KOFFOLK may forecast production planning needs, MERCK
        shall submit to KOFFOLK within one hundred and twenty (120) days of each
        CALENDAR QUARTER a non-binding estimate of its marketing requirements of
        PRODUCT for that CALENDAR QUARTER. MERCK shall, at least sixty (60) days
        before the beginning of each month, place a binding order with KOFFOLK
        for the quantity of PRODUCT required by MERCK for that month and which
        KOFFOLK shall have ready for delivery under Section 12 below for that
        month. MERCK's current non-binding estimate of its yearly requirements
        of PRODUCT is between [               ]. As soon as possible after 
        execution of the Agreement, MERCK will provide KOFFOLK with a
        non-binding estimate of its marketing requirements of PRODUCT for the
        following four (4) months and shall also provide its binding order of
        PRODUCT required by MERCK for the following two (2) months. Unless
        otherwise agreed to by the parties, MERCK shall place its orders in
        full container loads. MERCK will make its best effort to place its
        orders for a CALENDAR YEAR in approximately equal quarterly amounts.
        Notwithstanding the foregoing, KOFFOLK shall make every effort to
        comply with changes that MERCK wishes to make to a binding order, but
        shall not be held liable for its inability to do so.


                                        5





8.      QUALITY

8.1     The rights conferred by this Agreement are conditioned upon KOFFOLK
        undertaking the MANUFACTURE of PRODUCT strictly in accordance with the
        KNOW-HOW, current GOOD MANUFACTURING PRACTICES and all applicable
        regulatory requirements. KOFFOLK recognizes the serious nature of this
        Agreement and warrants that it will fully comply with the undertaking
        set forth in the preceding sentence.

8.2     KOFFOLK may not change the process by which PRODUCT is MANUFACTURED
        without prior written consent of MERCK.

8.3     KOFFOLK hereby agrees that MERCK or an AFFILIATE shall have the right to
        have reasonable access to the FACILITY during normal business hours in
        order to ascertain compliance by KOFFOLK with the terms of this
        Agreement, including but not limited to, inspection of MANUFACTURE of
        PRODUCT, storage facilities for PRODUCT, raw materials and packaging
        components, all equipment and machinery and all records relating to such
        MANUFACTURE, storage, equipment and machinery. Observations and
        conclusions of any MERCK audit will be discussed with and then issued to
        KOFFOLK, and corrective action shall be agreed upon by MERCK and KOFFOLK
        within twenty (20) days after MERCK delivers its audit report to
        KOFFOLK. Such corrective action will be implemented by KOFFOLK within
        forty-five (45) days of MERCK and KOFFOLK having agreed to the
        corrective action, unless otherwise agreed by the parties.

8.4     KOFFOLK hereby agrees to advise MERCK IMMEDIATELY of any proposed or
        unannounced visit or inspection of the FACILITY or relating to the
        PRODUCT or its MANUFACTURE by any regulatory authority and will permit
        MERCK to be present. If MERCK is not present during such a visit or
        inspection KOFFOLK shall IMMEDIATELY prepare and provide MERCK with a
        full report, in English, of the visit or inspection. KOFFOLK shall also
        IMMEDIATELY provide MERCK with copies of any letters, reports or other
        documents issued by any regulatory authority relative to such
        inspection. KOFFOLK shall prepare a response to any inspection report
        from a regulatory authority and shall submit it to MERCK for review and
        concurrence prior to submission to the regulatory authority. KOFFOLK
        shall also advise MERCK of any regulatory issues regarding any other
        product made, handled or stored at any other plant at KOFFOLK's Ramat
        Chovav operation which would affect MANUFACTURE of the PRODUCT.

8.5     KOFFOLK shall provide MERCK, at the cost and expense of KOFFOLK, samples
        in reasonable quantities and with relevant documentation from each
        production lot of PRODUCT. KOFFOLK and MERCK shall concurrently perform,
        at their respective quality control laboratories, such quality control
        tests as are indicated in the KNOW-HOW. KOFFOLK shall make the results
        of its quality control tests available to MERCK as directed. MERCK shall
        initiate all required quality control tests within fourteen (14) days of
        receipt of samples and MERCK shall advise KOFFOLK of the results without
        undue delay. Until such time as MERCK is satisfied that KOFFOLK's
        quality control laboratories are routinely achieving accurate test
        results within tolerance limits specified in MERCK's control procedures
        for the PRODUCT, no production lot of PRODUCT shall be released for
        delivery unless specific approval has been given in writing by MERCK.
        KOFFOLK is responsible for obtaining and retaining [     ] the amount of
        PRODUCT in [      ] required for quality control release testing as 
        indicated in the KNOW-HOW. KOFFOLK will perform annual stability testing
        at its cost in accordance with the specifications contained in the
        KNOW-HOW. When MERCK is satisfied that KOFFOLK routinely is reporting
        accurate test results within the approved tolerance limits, MERCK may
        inform KOFFOLK in writing that thereafter, until further notice, the
        PRODUCT may be released for delivery if KOFFOLK's tests, performed in
        accordance with procedures supplied by MERCK, show the PRODUCT to meet
        MERCK's acceptable quality standards. However, even after waiving such
        prior quality control approval, MERCK shall have the right 


                                        6





        to request representative samples of PRODUCT and KOFFOLK shall satisfy
        such requests. Any such waiver may be revoked at any time and shall not
        constitute a waiver of or affect in any way KOFFOLK obligations
        hereunder. KOFFOLK shall at all times ensure that PRODUCT is in
        conformity with the standards of quality currently applied by MERCK, and
        that the labels affixed to the PRODUCTS are those duly approved by MERCK
        and the relevant government authorities, where necessary, and shall bear
        the appropriate identification as may from time to time be determined by
        MERCK.

8.6     MERCK will specify all required labeling as agreed by the relevant
        government authorities, as necessary on the PRODUCT and all components
        and containers. KOFFOLK will comply with all specified labeling and use
        only labeling which has been approved in writing by MERCK in advance.

8.7     Should any production lot fail to meet the specifications set forth in
        Schedule A, such lot shall not be released. The loss resulting from such
        deficiency and the cost to dispose of or return the lot shall be borne
        by the party who is at fault, which shall be determined by MERCK's
        technical staff. If KOFFOLK does not agree with MERCK's determination of
        fault, the parties shall meet to attempt to resolve their differences.
        If the parties are unable to resolve their differences as to fault, then
        either party may refer the matter for final decision to a specialized
        firm of international reputation acceptable to both parties hereto. The
        decision of such firm shall be binding on both parties hereto. If MERCK
        is found to be at fault, it shall pay KOFFOLK the fee which it would
        have otherwise paid for the MANUFACTURE of the lot. If KOFFOLK is found
        to be at fault, it shall bear all costs for the lot. The party at fault
        shall pay the cost for the above-referenced specialized firm.

8.8     No PRODUCT or material made hereunder shall be re-worked unless such
        rework is permitted under the U.S. NADA for the PRODUCT.

8.9     KOFFOLK shall provide MERCK with quality control release certificates
        related to the PRODUCT for each batch. At MERCK's request, KOFFOLK shall
        provide MERCK with other MANUFACTURING records.

9.      RECALL

9.1     In the event MERCK or an AFFILIATE shall be required or shall
        voluntarily decide to recall any PRODUCT MANUFACTURED by KOFFOLK
        pursuant to this Agreement, then KOFFOLK shall fully cooperate with
        MERCK or its AFFILIATE in connection with the recall. If such recall is
        initiated because of a defect in the PRODUCT resulting from KOFFOLK's
        negligence in the MANUFACTURE or delivery of the PRODUCT, KOFFOLK will
        credit MERCK for the price it invoiced MERCK for all PRODUCT returned
        and, in addition, KOFFOLK will reimburse MERCK for all reasonable recall
        expenses in connection therewith.

9.2     KOFFOLK agrees to abide by all decisions of MERCK or an AFFILIATE to
        recall a PRODUCT and both parties shall fully cooperate with each other
        in the event of any recall of PRODUCT MANUFACTURED under this Agreement.

10.     COMPLAINTS

10.1    KOFFOLK and MERCK shall notify each other IMMEDIATELY if either receives
        any notice of a serious adverse reaction pertaining to the PRODUCT.
        KOFFOLK shall report monthly to MERCK all information concerning a
        complaint of any kind relating to the PRODUCT MANUFACTURED hereunder,
        its components or packaging, including but not limited to any PRODUCT
        quality complaint, or any side effect, injury, toxicity or sensitivity
        reaction.


                                        7





10.2    MERCK and KOFFOLK will maintain complaint files regarding components for
        packaging, including but not limited to any PRODUCT quality complaints.
        MERCK and KOFFOLK will notify each other IMMEDIATELY of any health
        hazards with respect to the PRODUCT which have impacted or may impact
        the employees involved in the production process.

11.     PURCHASES AND COMPENSATION

11.1    From the date of this Agreement through January 31, 1995, the price that
        MERCK shall pay for each kilogram of PRODUCT MANUFACTURED by KOFFOLK for
        MERCK hereunder shall be [                      ] one of the following 
        ports as designated per shipment by MERCK:  [                      ]  
        From February 1, 1995 through December 31, 1995, the price that MERCK
        shall pay for each [               ] of PRODUCT MANUFACTURED BY KOFFOLK 
        for MERCK hereunder shall be U.S. [                     ].  The period 
        from the date of this Agreement through December 31, 1995 shall be
        referred to herein as the "INITIAL PERIOD". During said INITIAL PERIOD
        MERCK shall purchase up to a maximum of [      ] metric tons of PRODUCT.

11.2    (a)    Upon termination of the INITIAL PERIOD, and for the remainder of 
               the term of this Agreement, the price that MERCK shall pay for 
               each [             ] of PRODUCT MANUFACTURED by KOFFOLK for MERCK
               hereunder shall be [                      ]  That price may be 
               adjusted only as set forth below except as otherwise agreed by 
               the parties in writing. Of the U.S. [             ] amount, 
               [               ] is attributed to the actual cost of the raw 
               material listed on Schedule D ("RAW MATERIAL COST ELEMENT") and 
               U.S. [                  ] is attributed to items other than raw 
               materials ("NON-RAW MATERIAL COST ELEMENT").

        (b)    If as of December 31, 1995, the cumulative actual cost of all the
               raw materials listed on Schedule D has increased by more than 
               [              ] over the cumulative actual cost of all such 
               materials as of [            ] listed on Schedule D, then within
               [              ] following [              ] KOFFOLK shall have 
               the right to request MERCK to meet and discuss such increase. The
               actual cost of a [           ] of any raw material under this 
               Agreement shall be determined by mulitplying the per [          ]
               purchase price of that raw material by the corresponding Factor 
               for that raw material listed on Schedule D. For example, if the 
               price at which raw material "X" is purchased is U.S. $1.00 per 
               [          ] and the Factor for raw material "X" is .2, then the 
               actual cost of raw material "X" is U.S. $0.20 per [             ]

        (c)    Commencing with the 4th CALENDAR QUARTER of 1996 and every
               subsequent 4th CALENDAR QUARTER during the term of the Agreement,
               the parties shall jointly review any changes in the actual cost
               of the raw material slisted on Schedule D during that CALENDAR
               YEAR. The parties review shall include, but not be limited to, a
               review of KOFFOLK's documentation as to raw material costs and
               contracts for raw materials.

        (d)    If under paragraph 11.2(c) above, the parties jointly determine
               that a change in the cumulative actual cost of all the raw
               materials has occurred, they wil then jointly determine what
               increase or decrease, if any, needs to be made to the RAW
               MATERIAL COST ELEMENT to account for that change. Any such
               increase or decrease shall be effective on January 1 of the
               following CALENDAR YEAR.

        (e)    Except as provided below, commencing January 1, 1997, and any
               subsequent January 1 during the term of this Agreement, the
               NON-RAW MATERIAL COST ELEMENT will be increased or decreased in
               accordance with the lesser of: (i) an increase or decrease in the
               cumulative actual 


                                        8





               cost of the energy and labor elements of the NON-RAW MATERIAL
               COST ELEMENT in the prior year, to be determined as set forth in
               paragraph 11.2(f) below; or (ii) [         ] of the percentage 
               increase or decrease in the Producer Price Index for Chemicals 
               and Allied Products in the prior year, as published by U.S. 
               Bureau of Labor Statistics. As the calculation of such increase 
               or decrease will likely not be made until after January 1, once 
               the calculation is made, it shall be retroactive to January 1. 
               Between the termination of the INITIAL PERIOD and December 21, 
               1996, MERCK will order a minimum of [            ] of PRODUCT. 
               None of those [            ] shall be subject to any increase 
               under this paragraph 11.2(e) even if they are delivered after 
               December 31, 1996.

        (f)    During the first CALENDAR QUARTER of 1997 and any subsequent
               first CALENDAR QUARTER during the term of this Agreement, the
               parties shall jointly review any changes in the cumulative actual
               cost of the energy and labor elements of the NON-RAW MATERIAL
               COST ELEMENT in the prior year. The parties review shall include,
               but not be limited to, a review of KOFFOLK's documentation as to
               energy and labor costs. If the parties jointly determine that a
               change in the cumulative actual cost of energy and labor has
               occurred, they will then jointly determine what the increase or
               decrease, if any, should be.

11.3    KOFFOLK shall submit an invoice covering each kilogram of PRODUCT
        MANUFACTURED by KOFFOLK for MERCK hereunder on the date that the PRODUCT
        is delivered under Section 12.3 below, and such invoice shall be
        accompanied by appropriate documentation evidencing performance of the
        invoiced activity. MERCK will pay such invoices with appropriate
        documentation within forty-five (45) days of MERCK's receipt of the
        PRODUCT.

11.4    KOFFOLK agrees that it shall keep accurate records in sufficient detail
        to enable the amounts due to KOFFOLK hereunder to be determined and,
        upon MERCK's request shall permit an independent chartered accountant,
        selected and paid for by MERCK, except one to whom KOFFOLK has
        reasonable objection, to have access during ordinary business hours to
        such of KOFFOLK's records as may be necessary to determine the
        correctness of any payment made or to be made under this Agreement. This
        right of audit shall apply to [           ] as described in Sections 
        11.1 and 11.2 above. Said accountant shall not disclose to MERCK any
        information other than information relating to the accuracy of reports
        and payments made under this Agreement, and in no event are the
        quantities and prices to individual customers or the names of those
        customers to be disclosed to MERCK. In the event of a determination by
        the independent chartered accountant that there has been an inaccurate
        calculation or payment, an appropriate adjustment shall be made to the
        next payment by MERCK. In the event that the adjustment requires payment
        from KOFFOLK to MERCK, subsequent payments by MERCK shall be reduced
        until no further payments are due from KOFFOLK.

11.5    Commencing January 1, 1996, if during any CALENDAR YEAR of this
        Agreement MERCK orders less than [               ] of PRODUCT, MERCK 
        agrees to meet with KOFFOLK to address the shortfall.

11.6    If through no fault of KOFFOLK withdrawal of PRODUCT is required by
        regulatory bodies in United States, France and the United Kingdom prior
        to January 1, 1996, MERCK and KOFFOLK will agree to negotiate in good
        faith, compensation for KOFFOLK's efforts.

11.7    If KOFFOLK is unable to obtain any license, permit or certificate which
        is necessary for it to perform its obligations hereunder or if MERCK is
        unable to supplement its registration for the PRODUCT in the United
        States, France or the United Kingdom in order to allow KOFFOLK to be
        MANUFACTURER of PRODUCT, the parties shall meet to determine in good
        faith whether the Agreement should be terminated and what, if any,
        compensation should be due to either party.


                                        9





12.     STORAGE AND DELIVERY OF PRODUCT

12.1    KOFFOLK shall, in accordance with the KNOW-HOW, maintain adequate
        storage accommodations for all the raw materials, packaging components
        and PRODUCT.

12.2    PRODUCT which has received quality control release shall be stored by
        KOFFOLK in a separate segregated area.

12.3    KOFFOLK shall deliver the PRODUCT to the port and under the terms
        identified by MERCK.

12.4    Claims that any shipment of PRODUCT does not meet the specifications
        contained in Schedule A or the indicated quantity shall be made by MERCK
        to KOFFOLK in writing within sixty (60) days following receipt thereof.
        Upon the receipt of a claim from MERCK, KOFFOLK shall assay its retained
        sample of PRODUCT. If KOFFOLK agrees with MERCK's claim and the defect
        is the fault of KOFFOLK, KOFFOLK shall replace the PRODUCT. If the
        parties are unable to resolve their differences, then either party may
        refer the matter for final analysis to a specialized firm of
        international reputation acceptable to both parties. The analysis of
        such firm shall be binding on both parties hereto. The party at fault
        shall pay the cost for such specialized firm and any costs associated
        with the disposal of PRODUCT.

13.     RECORDS

13.1    All records relating to MANUFACTURING of any PRODUCT shall be retained
        by KOFFOLK for a period of not less than seven (7) years from the date
        of MANUFACTURE of each lot of PRODUCT to which said records pertain.
        KOFFOLK shall provide MERCK with copies of the appropriate documents for
        each production lot, as requested by MERCK.

14.     TERM

14.1    The term of this Agreement shall begin on the date first written above
        and shall continue for a period of ten years from this date, unless
        terminated sooner as provided for below. At least six (6) months prior
        to the termination date of this Agreement, the parties shall decide
        whether the Agreement will be extended, and if so, on what terms.

15.     TERMINATION

15      1 MERCK shall have the right to terminate this Agreement in whole or in
        part, in the event KOFFOLK fails to fill orders placed by MERCK under
        Section 7 above for three (3) consecutive months.

15.2    Either party shall have the right to terminate this Agreement if the
        other party files a petition in bankruptcy, or enters into an agreement
        with its creditors, or applies for or consents to the appointment of a
        receiver or trustee, or makes an assignment for the benefit of
        creditors, or suffers or permits the entry of an order adjudicating it
        to be bankrupt or insolvent.

15.3    If either party materially breaches any of the provisions of this
        Agreement, and such breach is not cured within ninety (90) days after
        the giving of written notice by the other party specifying such breach,
        the other party shall have the right to terminate this Agreement without
        penalty upon a further sixty (60) days' written notice.

15.4    INFORMATION exchanged between MERCK and KOFFOLK for the MANUFACTURE of
        the PRODUCT shall be PROMPTLY returned to the disclosing party upon
        termination or natural expiration of the AGREEMENT or, at any time, upon
        request by the disclosing party.


                                       10





15.5    In the event of the sale of the controlling interest of the business of
        KOFFOLK, other than through a public offering of stock for which a
        registration is filed with the applicable regulatory authority, or the
        assignment or delegation by either party of its rights or obligations
        hereunder in violation of Section 20 below, KOFFOLK, in the event of
        such sale, or either party, in the event of such assignment, shall be
        required to provide IMMEDIATE notice to the other party and said other
        party shall have the right to terminate this Agreement within forty-five
        (45) days of receipt of such notice. Any notice of termination must be
        in writing and shall give rise to immediate termination of the
        Agreement. Furthermore, no penalty shall be due either party if the
        other party terminates pursuant to this Paragraph.

15.6     KOFFOLK shall not be entitled in connection with the termination or
         natural expiration of this Agreement, in accordance with its terms, to
         claim any indemnity, reimbursement or compensation for alleged losses
         of clientele, good will, loss of profits on anticipated sales or the
         like, and MERCK shall have no liability for losses or damages which
         might result from said termination or natural expiration of the
         Agreement. KOFFOLK acknowledges that it had decided and will decide on
         all investment expenditures and commitments in full awareness of the
         possibility of losses or damages resulting from termination or natural
         expiration of the Agreement and is willing to bear the risk thereof.

15.7    Upon termination of this Agreement, the provisions of Sections 2.1(c),
        2.3(c), 3, 9, 10, 11.4, 12.4, 13, 15.4, 15.6, 15.7, 18, 21, 22, 23-27,
        29 and 30 shall survive. The definitions in Section 1 above needed for
        the above surviving provisions shall also survive.

16.     AMENDMENTS

16.1    No modifications, changes, alterations, or additions to this Agreement
        shall be effective unless in writing, properly executed by authorized
        representatives of both parties, and identified as an Amendment to this
        Agreement.

17.     FORCE MAJEURE

17.1    Unless expressly provided for within this Agreement, neither party shall
        be responsible for any failure to comply with the terms of this
        Agreement where such failure is due to force majeure, which shall
        include, without limitation, fire, flood, explosion, strike, labor
        disputes, labor shortages, picketing, lockout, transportation embargo,
        or failures or delays in transportation, strikes or labor disputes
        affecting supplies, or acts of God, civil riot or insurrection, war,
        acts of the Government or any agency thereof judicial action or other
        reason of a like nature not the fault of the party delayed in performing
        work or doing acts required under the terms of this Agreement.
        Specifically excluded from this definition are those acts of Government
        (of the U.S. or Israel) or any agency thereof or judicial action which
        could have been avoided by compliance with such laws or regulations,
        publicly available and reasonably expected to be known by KOFFOLK or
        MERCK

17.2    Paragraph 17.1 shall not be available, however, to any party who fails
        to use reasonable diligence to remedy, remove or mitigate such cause and
        the effects thereof in an adequate manner and with all reasonable
        dispatch. The requirement that any force majeure hereunder and the
        effects thereof be remedied, removed or mitigated with all reasonable
        dispatch shall not require the settlement of strikes or labor
        controversies by acceding to the demands of the opposing party or
        parties.

17.3    The party affected by any such force majeure shall promptly notify the
        other, explaining the nature, details and expected duration thereof Such
        party shall also advise the other from time to time as to when the other
        can expect the affected party to resume performance in whole or in part
        of its obligations hereunder, as well as notify the other at the
        expiration of any such force majeure. If a party anticipates that force
        majeure may occur, including but not limited to a strike, that party
        shall also promptly notify the other explaining 


                                       11





        the nature, details and expected duration thereof Should any force
        majeure excusing performance hereunder result in a delay in performance
        or nonperformance in whole or in part which extends for a period
        exceeding ninety (90) days, either party may terminate this Agreement
        after such ninety (90) days on fifteen (15) days prior written notice.

18.     INDEMNITY

18.1    KOFFOLK shall indemnify and hold MERCK and its AFFILIATES harmless from
        and against any and all claims, losses, liabilities and expenses
        (including but not limited to reasonable lawyers' fees and other
        litigation costs) arising out of or resulting from KOFFOLK's (i)
        negligence or failure to follow the KNOW-HOW, including but not limited
        to the specifications contained therein, in the MANUFACTURE of PRODUCT;
        (ii) use of raw materials and packaging components, storage and disposal
        of PRODUCT, raw materials or packaging components in the MANUFACTURE of
        PRODUCT; or (iii) sale or provision of INTERMEDIATES to third parties
        under Section 2.1(b) above. MERCK shall indemnify and hold KOFFOLK and
        its AFFILIATES harmless from and against any and all claims, losses,
        liabilities and expenses (including but not limited to reasonable
        lawyers' fees and other litigation costs) arising out of or resulting
        from MERCK's negligence hereunder.

18.2    Each party agrees to give the other prompt written notice of any claims
        made, for which the other might be liable under the foregoing
        indemnification, together with the opportunity to defend, negotiate, and
        settle such claims. The party seeking indemnification under this
        Agreement shall provide the other party with all information in its
        possession, authority, and assistance to enable the indemnifying party
        to carry on the defense of such suit.

18.3    Neither party shall be responsible or bound by any settlement made
        without its prior written consent.

19.     COOPERATION

19.1    Each party agrees to execute such further papers, agreements, documents,
        instruments and the like as may be necessary to effect the purpose of
        this Agreement and to carry out its provisions.

19.2    At MERCK's written request, KOFFOLK shall cooperate with MERCK and
        provide such information as may be necessary to secure a duty suspension
        for the PRODUCT or any formulation derived from or a precursor to the
        PRODUCT in any jurisdiction where duty suspensions are allowed by law,
        regulation or authorized procedures. Any cost reductions derived from
        the award of any such duty suspension shall inure solely to MERCK.

20.     ASSIGNMENT/DELEGATION

20.1    This Agreement shall not be assignable by KOFFOLK, other than to an
        AFFILIATE, nor shall the obligations of KOFFOLK be delegatable without
        the prior written consent of MERCK, which consent shall not be
        unreasonably withheld. Any such attempted assignment or delegation by
        KOFFOLK without such prior written consent shall be void. If approved in
        writing by an authorized representative of MERCK, then once assigned or
        delegated, all of the provisions of this Agreement and all rights and
        obligations of the parties hereunder shall be binding upon and inure to
        the benefit of and be enforceable by and against the successors and
        assigns of KOFFOLK. In addition, in the event KOFFOLK seeks and obtains
        MERCK's consent to assign or delegate its rights or obligations to
        another party, the obligations of the assignee or transferee must be
        guaranteed in writing by KOFFOLK. At the sole discretion of MERCK, this
        guarantee of obligations may include the posting of a performance bond
        or establishment of an escrow account to guarantee performance.


                                       12





20.2    MERCK retains the right to assign its rights or delegate its obligations
        under this Agreement to a third party without the consent of KOFFOLK. In
        the event of such an assignment or delegation, all of the provisions of
        this Agreement and all rights and obligations of the parties hereunder
        shall be binding upon and inure to the benefit of and be enforceable by
        and against the successors and assigns of MERCK

21.     RELATIONSHIP CREATED

21.1    The relationship between KOFFOLK and MERCK is that of an independent
        contractor and a customer, respectively, and under no circumstances
        shall either party, its agents or employees be deemed agents or
        representatives of the other party. Neither party shall have the right
        to enter into any contracts or commitments in the name of or on behalf
        of the other party in any respect whatsoever. In addition, neither party
        shall hold itself out to anyone, or otherwise represent, that it has any
        such authority vis-a-vis the other party.

21.2    Nothing herein shall be construed as granting any license or right under
        any patent, trademark or KNOW- HOW or other right of either party, by
        implication or otherwise, to the other.

22.     INSURANCE

22.1    During the term of this Agreement KOFFOLK will maintain
        general/comprehensive liability including products liability insurance
        in an amount not less than one million dollars per occurrence and five
        million dollars in the aggregate. Such policy shall name Merck & Co.,
        Inc. as an "Additional Insured". KOFFOLK shall provide Certificates of
        Insurance evidencing said insurance, which will be placed with insurers
        acceptable to MERCK, and KOFFOLK shall provide written notice to MERCK
        at least thirty (30) days prior to cancellation, non-renewal or material
        change in such insurance.

23.     JURISDICTION

23.1    This Agreement shall be governed by, interpreted and construed, and all
        claims and disputes, whether in tort, contract or otherwise be resolved
        in accordance with the substantive laws of the State of New York, United
        States of America, without reference to any rules of conflict of laws or
        renvoi. In the event of any controversy or claim arising our of or
        relating to this Agreement, performance hereunder, termination hereof,
        or relationship created hereby, each party irrevocably submits to the
        exclusive jurisdiction of the courts of the Supreme Court of the State
        of New York and the U.S. District Court for the Southern District of New
        York for the purposes of any suit, action or other proceeding arising
        out of this Agreement or transactions contemplated hereby. Each party
        irrevocably and unconditionally waives any objection to the laying of
        venue in the courts of New York as stated above and that any such action
        was brought in an inconvenient forum. Notwithstanding the foregoing, in
        the event of a threatened disclosure in violation of this Agreement,
        MERCK shall have the right to seek injunctive relief from any competent
        court in the jurisdiction where the disclosure is threatened to prevent
        such disclosure pending resolution of the merits of the dispute.

24.     HEADINGS

24.1    The headings used in this Agreement are intended for convenience only
        and shall not be considered part of the written understanding between
        the parties and shall not affect the construction of the Agreement.

25.     ENTIRE AGREEMENT

25.1    This Agreement and the attached Schedules constitute the entire
        Agreement between the parties relating to the subject matter hereof and
        all prior proposals, discussions, and writings by and between the
        parties and 


                                       13





        relating to the MANUFACTURING of the PRODUCT are superseded, except that
        the Confidentiality Agreement between the parties last dated September
        6,1993 and the Letter Agreement between MERCK and Philipp Brothers
        Chemicals, Inc. last dated February 7,1994 shall continue in effect for
        all information communicated by MERCK under those Agreements. As set
        forth in Section 3.1(h) above, the term of confidentiality and non-use
        in the Confidentiality Agreement has been changed to fifteen (15) years
        from disclosure.

25.2    All work performed by KOFFOLK for MERCK shall be subject to the
        provisions of this AGREEMENT and attached Schedules and shall not be
        subject to the terms and conditions contained in any purchase order of
        MERCK or confirmation of KOFFOLK except insofar as any such purchase
        order or confirmation provides the identity of PRODUCT, delivery date
        and place of delivery and labeling or packaging changes.

26.     WAIVER

26.1    Failure by MERCK or KOFFOLK at any time to enforce any of the terms or
        conditions of this Agreement shall not affect or impair such terms or
        conditions in any way, or the right of MERCK or KOFFOLK at any time to
        avail itself of such remedies as it may have for any breach of such
        terms or conditions under the provisions of this Agreement, in equity or
        at law.

27.     SEVERABILITY

27.1    If any term or provision of this Agreement shall be held invalid or
        unenforceable, the remaining terms hereof shall not be affected but
        shall be valid and enforced to the fullest extent permitted by law. The
        parties hereto shall use best efforts to substitute a valid, legal and
        enforceable provision which, in so far as practical, implements the
        purpose hereof.

28.     WASTE

28.1    KOFFOLK shall assume responsibility for disposing of all waste and
        rejected raw material, components, or PRODUCT generated during the
        performance of this Agreement in accordance with all applicable
        governmental laws, rules and regulations.

29.     ENVIRONMENTAL

29.1    KOFFOLK will comply with all applicable governmental laws, rules and
        regulations as well as any other applicable laws, rules and regulations,
        including but not limited to those relating to the protection of human
        health and the environment.

29.2    KOFFOLK agrees to indemnify, defend, and hold harmless MERCK, its
        employees, agents, heirs and assigns from and against any and all
        damage, claim, liability, or loss, including reasonable attorneys' and
        other fees, arising out of or in any way connected to (1) any condition
        in, on, or near the FACILITY; or (2) any condition caused by KOFFOLK,
        its employees or agents or arising out of or in any way connected to any
        act or omission whatsoever of KOFFOLK, and/or with KOFFOLK's operations,
        employees or agents. KOFFOLK's duty of indemnification shall include,
        but not be limited to, damage, liability, or loss pursuant to any
        applicable government's environmental laws; or pursuant to claims for
        injury to person or damage to property including natural resources and
        further including claims for environmental investigation and/or
        remediation of property at or around the FACILITY or any off-site
        location where material from the FACILITY may have been transported or
        otherwise came to be located. This provision will not be construed, nor
        interpreted as an assumption of acknowledgment by KOFFOLK of any
        obligation to any person or entity other than MERCK. KOFFOLK has the
        option of selecting the attorneys for the defense of claims under this
        provision. MERCK may elect to have its own attorneys as additional


                                       14





        counsel, in which case MERCK shall be responsible for the fees of said
        attorneys. KOFFOLK shall have a continuing obligation to fully cooperate
        with MERCK in the defense of any such claim. If MERCK's negligence is
        the sole cause of the referred damage, claim, liability or loss, KOFFOLK
        shall not be required to indemnify MERCK.

30.     NOTICE

30.1    All notices and demands required or permitted to be provided under the
        terms of this Agreement shall be in writing and in English unless
        otherwise expressly provided in this Agreement and shall be conclusively
        presumed for all purposes of this Agreement to be given or made at the
        time the same is received by one of the parties via certified mail,
        return receipt requested with sufficient first-class postage, prepaid,
        addressed as follows:

         If to KOFFOLK:
         Koffolk, Ltd.
         P.0. Box 1098
         61010 Tel Aviv, Israel
         Telephone:        (011) 972-3-921-9961
         Panafax:          (011) 972-3-923-0341
         Attention:        Avraham Raz

         Philipp Brothers Chemicals, Inc.
         One Parker Plaza
         Fort Lee, New Jersey 07024 U.S.A.
         Telephone:        (201) 944-6020
         Panafax:          (201) 944-5937
         Attention:        Jack C. Bendheim

         If to MERCK:
         Merck & Co., Inc.
         One Merck Drive
         Whitehouse Station, New Jersey 08889 U.S.A.
         Telephone: (908) 423-3068
         Panafax:  (908) 735-1106
         Attention:        Vice President, Business Affairs, Merck Manufacturing
                           Division

               IN WITNESS WHEREOF, the parties hereto have caused this Agreement
to be executed in duplicate by their representatives duly authorized as of the
day and year first above written.

MERCK & CO.

By:  /s/
Title:  V.P.

KOFFOLK, LTD.
By:  /s/
Title:  G.M.

PHILIPP BROTHERS CHEMICALS, INC.
By:  /s/_Jack_C._Bendheim
Title:  President



                                       15






Schedule A

Specifications

CONFIDENTIAL TREATMENT REQUESTED FOR ALL BRACKETED ([]) INFORMATION.  THE
CONFIDENTIAL PORTION HAS BEEN SO OMITTED AND FILED SEPARATELY WITH THE
COMMISSION.

[                                ]







Schedule B

Packaging

CONFIDENTIAL TREATMENT REQUESTED FOR ALL BRACKETED ([]) INFORMATION.  THE
CONFIDENTIAL PORTION HAS BEEN SO OMITTED AND FILED SEPARATELY WITH THE
COMMISSION.

[                              ]








Schedule C

Technical Know-How Package

CONFIDENTIAL TREATMENT REQUESTED FOR ALL BRACKETED ([]) INFORMATION.  THE
CONFIDENTIAL PORTION HAS BEEN SO OMITTED AND FILED SEPARATELY WITH THE
COMMISSION.

[                               ]







Schedule D

Raw Material Costs

CONFIDENTIAL TREATMENT REQUESTED FOR ALL BRACKETED ([]) INFORMATION.  THE
CONFIDENTIAL PORTION HAS BEEN SO OMITTED AND FILED SEPARATELY WITH THE
COMMISSION.

[                               ]