LICENSE AGREEMENT
         THIS LICENSE  AGREEMENT (the  "Agreement")  is effective as of March 5,
1999  (the  "Effective  Date"),   between   IMMUNOMEDICS,   INC.   (hereinafter,
Immunomedics"),  having its  principal  place of business at 300 American  Road,
Morris Plains, New Jersey 07950, and IBC  PHARMACEUTICALS,  L.L.C.  (hereinafter
"IBC"),  having its  principal  place of  business  at c/o David M.  Goldenberg,
Immunomedics, Inc., 300 American Road, Morris Plains, New Jersey 07950.

                                   WITNESSETH

         WHEREAS,  Immunomedics  owns or controls  certain  Immunomedics  Patent
Property  and  Immunomedics  Biotechnology  Assets  (as such  terms are  defined
below), relating to the production and use of CEA-specific monoclonal antibodies
(Mabs), and has access to technology for the production of other humanized Mabs,
and certain adjuvant treatment; and

         WHEREAS,  IBC has  expressed  an  interest  in  obtaining  a license or
sublicense  under  certain  Immunomedics  Patent  Property and the  Immunomedics
Biotechnology Assets, and obtaining certain services and Mabs from Immunomedics;
and

         WHEREAS,  Immunomedics  is a member of IMG Technology,  LLC ("IMG"),  a
Delaware limited liability company which in turn is a member of IBC; and

         WHEREAS, IMG, as and for its capital contribution to IBC, has agreed to
arrange  for  the  licensing  or  sublicensing  by  Immunomedics  to  IBC of the
Immunomedics Patent Property and the Immunomedics Biotechnology Assets; and

         WHEREAS,  Immunomedics is willing, as and for its capital  contribution
to IMG, to license or sublicense to IBC said  Immunomedics  Patent  Property and
the Immunomedics Biotechnology Assets and provide such services and Mabs to IBC,
subject to the terms and conditions contained herein;

         NOW,  THEREFORE,  in  consideration  of  the  mutual  covenants  herein
contained and intending to be legally bound thereby, the parties hereto agree as
follows:

1.       DEFINITIONS.

         1.1 "Affiliate" of a party shall mean any corporation or other business
entity  controlled  by,  controlling  or under common control of a party to this
Agreement.  The word and root  "control" in the context of a  corporation  shall
mean direct or indirect beneficial  ownership of at least fifty percent (50%) of
the  shares  entitled  to vote for  members  of the Board of  Directors  of such
corporation;  and, in the  context of any other  business  entity,  the right to
receive at least fifty percent (50%) of the net income of such business  entity.



Notwithstanding  the  foregoing,  for purposes of this  Agreement,  Immunomedics
shall be deemed to be an Affiliate of IBC as long as Immunomedics  owns directly
or  beneficially at least fifteen percent (15%) of the shares of IBC entitled to
vote for members of the Board of  Directors  of IBC, but IBC shall not be deemed
to be an  Affiliate  of  Immunomedics,  and IBC  shall  not be  deemed  to be an
Affiliate of Coulter  Corporation,  Immunotech S.A. or Immunotech  Partners S.A.
nor shall Coulter  Corporation,  Immunotech S.A. or Immunotech  Partners S.A. be
deemed to be Affiliates of IBC.

         1.2  "Immunomedics  Patent  Property"  shall  mean  each and all of the
patents and  applications  contained in Exhibit 1; the patents  which issue from
such applications, as well as patents issuing from any continuation, substitute,
division, or continuation-in-part of the Exhibit 1 patents and applications, and
any reissues,  reexaminations  or  extensions of such patents;  and, all foreign
counterpart  applications and the patents which issue  therefrom,  including all
foreign   applications   which  claim   priority   from  any  of  the  foregoing
applications.  For  the  purposes  of this  agreement,  a  "foreign  counterpart
application"  is an  application  filed  in a  country  other  than  that of the
basic/parent  application which application claims subject matter disclosed,  in
whole or in part, in such basic/parent application.

         1.3  "Immunomedics  Biotechnology  Assets"  shall  mean:  (a) Class III
CEA-specific monoclonal antibodies,  and methods,  processes,  and protocols for
their production;  (b) technology for producing humanized Class III CEA-specific
monoclonal antibodies;  and (c) patents and patent applications having claims to
the use of lysine to reduce renal toxicity of cancer  radioimmunotherapy  within
the IBC Field.  In each case the assets include those assets owned or controlled
by Immunomedics now or at any time during the term of this Agreement .

         1.4  "AES  Technology"  shall  mean  technology  in  which  bi-specific
antibodies and radiolabeled  bivalent haptens are used to increase dose delivery
to tumors and reduce  toxic side  effects  caused by high levels of compounds in
healthy  tissue and organs  and which is  covered by one or more  patent  claims
contained in one or more patents and patent applications listed in Exhibit 2.

         1.5 "Control"  "Controls" and "Controlled By" shall mean the ability to
grant the licenses or sublicenses  herein or to provide the Mabs or services set
forth herein,  as the case may be, without  violating the terms of any agreement
or other arrangement with any third party.

         1.6 "IBC Field"  shall mean the field of  radioimmunotherapy  (RAIT) of
cancer using AES Technology,  including  applications  solely for laboratory and
clinical research purposes.

         1.7      "Mabs" shall mean monoclonal antibodies or fragments thereof.

                                       2


2.       GRANTS AND SERVICES.

         2.1      Grant to IBC.

                  2.1.1   Immunomedics   hereby   grants  to  IBC  a  worldwide,
royalty-free,   exclusive   license,   limited  to  the  IBC  Field,  under  the
Immunomedics  Patent  Property and the  Immunomedics  Biotechnology  Assets,  to
practice any and all methods,  and to use,  offer for sale, and sell any and all
kits, components,  reagents,  Mabs and products which are covered by one or more
claims in said Immunomedics  Patent Property or are included in the Immunomedics
Biotechnology Assets.

                  2.1.2 IBC has the right to sublicense its rights  described in
Section 2.1.1 to its Affiliates,  comarketers and  distributors,  subject to the
same limitations that apply to the underlying  license,  except for the right to
further sublicense.

         2.2      Supply of Mabs and Products to IBC

                  2.2.1   Immunomedics   shall,  in  accordance  with  a  supply
agreement to be hereafter  mutually  agreed upon,  supply to IBC its  reasonable
requirements of CEA-specific  Mabs covered by the  Immunomedics  Patent Property
and Immunomedics Biotechnology Assets, on reasonable commercial terms.

                  2.2.2 Immunomedics shall, once a product or products have been
developed by IBC,  negotiate in good faith a supply agreement with IBC to supply
to IBC its reasonable  requirements of finished products comprising CEA-specific
Mabs, on reasonable commercial terms.

                  2.2.3 In the event that the  parties  are unable to agree upon
the terms of the supply  agreement  described in Sections  2.2.1 and 2.2.2,  the
terms of that agreement will be determined in a binding  arbitration  proceeding
as described in Section 15 below.

                  2.2.4  To  ensure  supply  of the  Immunomedics  Biotechnology
Assets,  Immunomedics  shall  establish and maintain  viable samples of all cell
lines necessary to manufacture the Mabs and humanized Mabs described in Sections
1.3(a) and 1.3(b) at an off-site location.



         2.3      Access to Technology

                  2.3.1   Immunomedics   has  licenses  and  rights  to  certain
technology for producing  humanized Mabs (hMabs) and shall, upon written request

                                       3


from IBC, use reasonable commercial efforts to apply such technology to generate
humanized  anti-hapten  Mab  for  use  with  the  AES  Technology,   subject  to
Immunomedics'  right to practice  such  technology  on behalf of others and also
subject to the payment by IBC of any  royalties  owed by  Immunomedics  to third
parties by reason of Immunomedics  applying such technology on behalf of IBC. If
Immunomedics   is  successful  in   constructing   a  suitable   humanized  Mab,
Immunomedics shall negotiate in good faith a supply agreement with IBC to supply
to IBC on  reasonable  commercial  terms  its  reasonable  requirements  of such
humanized anti-hapten Mab.

                  2.3.2  Immunomedics  has licenses and rights to certain lysine
adjuvant treatment technology for mitigating the side effects of RAIT and agrees
to make such  technology  available to IBC for use in the IBC Field , subject to
Immunomedics'  right to grant  sublicenses  thereunder  and also  subject to the
payment by IBC if any royalties owed by  Immunomedics to third parties by reason
of Immunomedics applying such technology on behalf of IBC.

         2.4      Use of Biotechnology Assets.

                  2.4.1 IBC agrees  that it will not itself  produce nor use any
third party to produce the Mabs to be supplied by Immunomedics  under the supply
agreement to be hereafter negotiated, and that it will use the CEA-specific Mabs
supplied by Immunomedics  solely for products and applications in the IBC Field.
IBC will protect the  confidentiality  of the intellectual  property relating to
the Immunomedics Biotechnology Assets with at least the same care as used by IBC
to  protect  its own  biotechnology  assets of  comparable  value.  IBC will use
reasonable  commercial  efforts  to keep  records of the use,  distribution  and
location of each lot of CEA-specific Mabs provided by Immunomedics.

         2.5      Right of First Negotiation for New Technology

                  2.5.1  Immunomedics  hereby  grants  to IBC the right of first
negotiation  to license,  on  reasonable  commercial  terms,  future  technology
developed or acquired by Immunomedics and under which Immunomedics has the right
to grant  licenses or  sublicenses in the IBC Field that may be useful to IBC to
improve its products in the IBC Field.  This right of first negotiation shall be
in force for a period of 60 days from the date that IBC  requests a license  for
any such technology.

         2.6      Right   of   First  Negotiation  for  Marketing,  Selling  and
                  Distribution

                  2.6.1  Upon   request  by   Immunomedics,   IBC  shall  inform
Immunomedics of the territories where IBC is marketing IBC products. For any IBC
products that are marketed,  sold, or distributed in at least one territory, IBC
hereby grants to Immunomedics the right of first negotiation to market, sell and
distribute  those products in any other  territory where  Immunomedics  markets,

                                       4


sells or distributes its own products but where IBC does not itself market, sell
or  distribute  the  IBC  products   (hereinafter   the   "Available   Marketing
Territories"). This right of first negotiation shall be in force for a period of
60 days  from  the date  that  Immunomedics  requests  marketing  rights  in the
Available Marketing Territories.


3.       CONSIDERATION.

         3.1 IBC  Stock  Consideration  To IMG.  As full  consideration  for the
grants set forth in Section 2.1 of this Agreement, IBC shall sell and deliver to
IMG the  ownership  of Three  Million  Seven  Hundred  Twenty-Nine  Thousand Six
Hundred  (3,729,600)  shares of IBC's  Series A  Preferred  Membership  Interest
Units, pursuant to that certain Operating Agreement of IBC, dated as of March 5,
1999, by and among IMG.,  IBC and certain other parties,  said  conveyance to be
made on the Effective Date hereof.


4.       IMMUNOMEDICS REPRESENTATIONS AND WARRANTIES,
         DISCLAIMERS AND INDEMNIFICATION.

         Immunomedics represents and warrants:

         4.1      Property.

                  4.1.1  Immunomedics  owns or Controls the Immunomedics  Patent
Property and Immunomedics Biotechnology Assets applicable to AES Technology.

                  4.1.2  If  Immunomedics  should  do  anything  or  fail  to do
anything  it is  required  to do in  the  agreements  granting  it  licenses  of
Immunomedics  Patent  Property  which  result  in the loss of such  licenses  or
jeopardize the sublicense granted hereunder to IBC, Dr. David M. Goldenberg, the
licensor of such Immunomedics Patent Property,  by his  countersignature to this
Agreement,  agrees to directly license IBC so as to maintain the same rights and
conditions under which IBC is licensed under this Agreement.

                  4.1.3 Immunomedics has not been sued or charged as a defendant
in any claim,  suit, action or proceeding which involves a claim of infringement
of any patents or violation of any trade  secret or other  proprietary  right of
any third  party  with  respect  to the  Immunomedics  Biotechnology  Assets and
Immunomedics  Patent  Property.   The  Immunomedics   Biotechnology  Assets  and
Immunomedics Patent Property are not subject to any outstanding order, judgment,
decree, stipulation or agreement restricting in any manner the sale, assignment,
licensing or sublicensing thereof by Immunomedics.

                  4.1.4 Except for current litigation against  Hoffmann-La Roche
("Roche")  and claims or defenses  by Roche and its  affiliates  of  invalidity,
Immunomedics  has no knowledge  of any claims with  respect to the  Immunomedics

                                       5


Patent Property that have been asserted or threatened,  by any other person,  or
of any  valid  grounds  for any bona  fide  claims  challenging  the  ownership,
validity or enforceability of any of the Immunomedics Patent Property,  nor does
any officer of Immunomedics have any knowledge of any material unauthorized use,
infringement or  misappropriation  of any of the Immunomedics Patent Property by
any third party, including any employee or former employee of Immunomedics.

                  4.1.5  Nothing  in this  agreement  shall  be  construed  as a
warranty or  representation  by Immunomedics  that anything made by Immunomedics
and sold to IBC or made, used,  sold, or otherwise  disposed of by IBC under any
license  or  sublicense  granted  in this  agreement  is or  will  be free  from
infringement  of  patents  of third  parties.  Immunomedics  makes no  warranty,
express or implied,  concerning  the fitness for any  particular  purpose of any
products licensed or the property rights licensed to IBC.

         4.2  DISCLAIMER.  NOTHING  IN THIS  AGREEMENT  SHALL BE  DEEMED TO BE A
REPRESENTATION  OR  WARRANTY  BY  IMMUNOMEDICS  OF  THE  ACCURACY,   SAFETY,  OR
USEFULNESS  FOR  ANY  PURPOSE  OF  ANY  TECHNICAL  INFORMATION,  TECHNIQUES,  OR
PRACTICES AT ANY TIME MADE AVAILABLE BY IMMUNOMEDICS. IMMUNOMEDICS SHALL HAVE NO
LIABILITY WHATSOEVER TO IBC OR ANY OTHER PERSON FOR OR ON ACCOUNT OF ANY INJURY,
LOSS, OR DAMAGE, OF ANY KIND OR NATURE,  SUSTAINED BY, OR ANY DAMAGE ASSESSED OR
ASSERTED  AGAINST,  OR ANY OTHER LIABILITY  INCURRED BY OR IMPOSED ON IBC OR ANY
OTHER  PERSON,  ARISING OUT OF OR IN CONNECTION  WITH OR RESULTING  FROM (A) THE
PRODUCTION,  USE, OR SALE OF ANY  APPARATUS  OR PRODUCT,  OR THE PRACTICE OF THE
PATENTS;  (B) THE USE OF ANY  TECHNICAL  INFORMATION,  TECHNIQUES,  OR PRACTICES
DISCLOSED  BY  IMMUNOMEDICS;   OR  (C)  ANY  ADVERTISING  OR  OTHER  PROMOTIONAL
ACTIVITIES WITH RESPECT TO ANY OF THE FOREGOING.

         4.3  Indemnification.  IBC  shall  hold  Immunomedics,  its  directors,
officers,  employees  and agents,  harmless from and against any and all claims,
expenses  (including  reasonable  attorneys  fees),  proceedings,   demands  and
liability  of any  kind  whatsoever  arising  out of or in  connection  with  or
resulting from any of the matters described in Section 4.2 hereof.

         4.4  Insurance.  IBC shall  obtain  and carry in full  force and effect
liability  insurance which shall fully protect  Immunomedics in regard to events
covered by Section 4.2 above.  IBC shall cause  Immunomedics to be included as a
named insured on any such insurance.  IBC shall furnish  certificate(s)  of such
insurance to  Immunomedics,  upon request.  The amount of such coverage shall be
the maximum obtainable at reasonable cost.

5.       IBC REPRESENTATIONS AND WARRANTIES.

                                       6


         IBC represents and warrants:

         5.1  Organization  and  Good  Standing.  IBC  is  a  limited  liability
corporation,  legally and validly incorporated,  organized, existing and in good
standing under the laws of the State of Delaware.

         5.2      Authority Regarding this Agreement.

                  5.2.1 IBC has the  complete  and  unrestricted  right,  power,
authority and capacity to: (a) execute and deliver this Agreement; and (b) carry
out and perform IBC's obligations pursuant to this Agreement.

                  5.2.2  No  further  corporate  or  shareholder   approvals  or
proceedings  are necessary on the part of IBC to authorize this Agreement or any
of the transactions contemplated hereby. The execution, delivery and performance
of this  Agreement  by IBC does not  require  notice to, or consent or  approval
from, any governmental body or other regulatory authority.

                  5.2.3 This  Agreement  has been duly and validly  executed and
delivered  by  IBC  and  is a  legal,  valid  and  binding  obligation  of  IBC,
enforceable in accordance with its terms.


6.       PATENT PROPERTY.

         6.1  Prosecution  and  Maintenance.  Immunomedics  shall,  at  its  own
expense,  (i) file and prosecute all patent  applications  contained  within the
Immunomedics  Patent Property and (ii) maintain all patents contained within the
Immunomedics Patent Property; provided that Immunomedics may abandon one or more
applications or patents  contained  within the  Immunomedics  Patent Property if
Immunomedics  and IBC agree that the prospect for  obtaining  commercial  useful
protection  does not justify the cost of pursuing or maintaining the application
or patent.

         6.2      Infringement of Patent Property by Third Parties.

                  6.2.1 Notice.  Each party shall  promptly  notify the other in
writing of any alleged or threatened  infringement  of the  Immunomedics  Patent
Property of which it becomes aware and which may adversely  impact the rights of
IBC hereunder.

                  6.2.2 Enforcement Action. In the event that the parties become
aware of any such alleged or threatened  infringement of the Immunomedics Patent
Property by a person or entity who is a direct  competitor of IBC,  Immunomedics
shall have the right, but not the obligation, to take appropriate action against
such  person  or  entity.  In the  event  Immunomedics  fails  to  institute  an
infringement   suit  or  take  other  reasonable  action  in  response  to  such

                                       7


infringement  within  sixty  (60) days,  IBC shall  have the right,  but not the
obligation upon thirty (30) days notice to Immunomedics,  to institute such suit
or take other  appropriate  action in its own name;  provided  however,  that if
necessary,  Immunomedics agrees to be joined as a party plaintiff. Regardless of
which party brings such  enforcement  action,  the other party hereby  agrees to
cooperate reasonably in any such effort. The party not bringing the action shall
have the right to  participate  in such action at its own  expense  with its own
counsel and any recovery  obtained by settlement or otherwise shall be disbursed
as follows:  each party shall first recover any reasonable  expenses incurred in
such action (including  counsel fees).  Thereafter,  the parties shall share any
remaining recovery in the same proportion as their recovered costs. In the event
that the party not  bringing  the  action  does not want to  participate  in the
recovery obtained by settlement or otherwise, then the party instituting the law
suit shall be  responsible  for all costs and expenses of the  non-participating
party in cooperating with the party instituting the law suit.

         6.3      Infringement of Third Party Patent Rights.

                  6.3.1  In the  event  that  the use or sale  of a  process  or
product  incorporating  AES  Technology  in the IBC  Field  and  covered  by the
Immunomedics Patent Property becomes the subject of a claim of infringement of a
patent or other proprietary  right, the parties shall promptly confer to discuss
the claim and whether a joint defense is feasible or desirable.

                  6.3.2 Unless the parties otherwise agree, IBC shall assume the
responsibility  and  expense  for the  conduct of the  defense of any such claim
described  in Section  6.3.1.  Immunomedics  shall  have the right,  but not the
obligation,  to  participate  in any such suit at its sole option and at its own
expense.  Each party shall  reasonably  cooperate with the party  conducting the
defense of the claim.  No party shall enter into any settlement that affects any
other party's rights or interests  without such other party's  written  consent,
not to be unreasonably withheld.

         6.4      Joint inventions.

                  6.4.1  "Joint  Invention(s)"  means  any  discovery,   whether
patentable or otherwise, relating to the AES Technology which is jointly made by
one or more  employees  of IBC and one or more  employees of  Immunomedics,  the
inventorship  to be determined  by the criteria  used to determine  inventorship
under U.S. patent law, and any U.S. or foreign patent  application  claiming the
discovery, together with all divisions,  continuations, or continuations-in-part
thereof, and any patents issued thereon or reissues or extensions thereof.

                  6.4.2. IBC and Immunomedics shall be joint owners of the Joint
Invention(s),  all  know-how  and  information  necessary  to practice the Joint
Invention(s),  any  applications  for  patent  which  may be filed on the  Joint
Invention(s),   and  any   improvements   thereon  which  arise  from  continued

                                       8


collaborative  research between the parties,  and each and every patent covering
the Invention(s), or such improvements,  that may be issued in the United States
of America and in any foreign country.  IBC and  Immunomedics  shall each have a
fifty percent (50%) interest in each Joint Invention.

                  6.4.3 Responsibility for preparing,  filing, prosecuting,  and
maintaining all patent applications and patents embodying the Joint Invention(s)
shall be with Immunomedics, who will consult with and keep IBC fully informed as
to  the  preparation,   filing,   prosecution  and  maintenance  of  all  patent
applications  and patents  relating to the Joint  Invention(s).  Prosecution  or
maintenance  of any  patent or patent  application  shall  not be  abandoned  by
Immunomedics without the written consent of IBC.
                  6.4.4  Immunomedics  and IBC will  each use  their  reasonable
efforts to assure that the inventors and other employees thereof fully cooperate
in  the  preparation,   filing,  prosecution,  and  maintenance  of  all  patent
applications and patents embodying the Joint Invention(s).

                  6.4.5 IBC shall pay all reasonable  expenses  associated  with
preparing,  filing,  prosecuting,  and maintaining all patent  applications  and
patents relating to the Joint  Invention(s),  unless  Immunomedics is also using
the technology  covered by the claims of the application or patent in which case
the parties shall share equally in such costs and expenses.  Immunomedics  shall
maintain  adequate records showing all expenses incurred in connection with such
patent  applications  and  patents,  which  shall be made  available  to IBC for
inspection on reasonable notice. In the event that Immunomedics  anticipates the
possibility  of any  extraordinary  expenditures  arising from the  preparation,
filing,  prosecution,  or  maintenance  of  any  patent  application  or  patent
contemplated  by this  Agreement,  Immunomedics  shall  provide  IBC  with  full
particulars  and shall  discuss  with IBC mutually  acceptable  course of action
prior to incurring such expenditures.  IBC shall reimburse Immunomedics for such
costs  and  expenses  within  sixty  (60)  days of  receiving  an  invoice  from
Immunomedics for such expenses.

                  6.4.6 Either party may elect to discontinue  its obligation to
pay or reimburse  expenses  associated with any selected  patent  application or
patent for a Joint Invention within any national  jurisdiction,  upon sixty (60)
days written notice by such party (the  "Terminating  Party") to the other party
(the "Continuing Party").

                  6.4.7 The Continuing Party may elect to request  assignment of
the  selected  patent  rights  owned  by the  Terminating  Party  in  the  Joint
Invention(s) and any licenses issued for said Joint Invention(s). The Continuing
Party shall make its election and shall advise the Terminating  Party in writing
within  thirty  (30) days  after  receipt  of a notice of  discontinuance  under
Section  6.4.6.  Subject  to the  assumption  by the  Continuing  Party  of sole
responsibility  for the  management and expense of the Joint  Invention(s),  the
Terminating  Party  shall  convey  to the  Continuing  Party  assignment  of the

                                       9


Invention(s)  and licenses,  and shall do all things  necessary to transfer file
wrappers and other files  related to such rights and licenses to the  Continuing
Party or its designee.  Upon  perfection of such  assignments,  the  Terminating
Party shall have no further  rights or  obligations  with  respect to such Joint
Invention, and the Continuing Party may thereafter separately license such Joint
Invention, without accounting to the Terminating Party.


7.       TERM AND TERMINATION.

         7.1 Term. This Agreement shall become  effective  immediately  upon the
Effective Date and, unless earlier  terminated by the provisions for termination
herein,  shall continue in effect until the last to expire of the patents within
the  Immunomedics  Patent  Property  to which IBC has a license  or  sublicense,
whether  such patent is currently  issued or issues from any patent  application
contained within the Immunomedics Patent Property.

         7.2      Termination.

                  7.2.1 Material Default By Licensee Upon any material breach or
default  under  this  Agreement  by IBC,  Immunomedics  shall  have the right to
terminate  this  Agreement  and  the  rights,  privileges  and  license  granted
hereunder by forty-five  (45) days advance notice to IBC specifying such default
or  breach.  Such  termination  shall  become  effective  unless  IBC shall have
substantially  cured any such breach or default  prior to the  expiration of the
said forty- five (45) day period, or, if the breach or default cannot reasonably
be cured within such forty-five  (45) day period,  IBC shall have commenced such
cure within such forty-five (45) day period and shall diligently  prosecute such
cure to completion  within not more than an additional  forty-five (45) days. In
the event IBC: (i) becomes insolvent, makes a general assignment for the benefit
of its creditors,  or admits in writing its inability to pay its debts generally
as they  become  due;  (ii) files a voluntary  petition  in  bankruptcy,  or, by
voluntary petition,  answer or consent, seeks relief under the provisions of any
bankruptcy or other similar law providing for its  reorganization or winding up,
or  providing  for an  agreement,  composition,  extension  or  adjustment  with
creditors;  petitions  or  consents  to  the  appointment  of a  receiver,  this
Agreement may be terminated  immediately  and without notice by  Immunomedics at
Immunomedics'  option.  In the  event  of an  involuntary  bankruptcy  petition,
Immunomedics  may immediately  suspend the license granted under this Agreement,
subject to  reinstatement  only if the bankruptcy is dismissed within sixty (60)
days or, in the case of a receiver,  such appointment is being contested in good
faith and such appointment is dismissed within sixty (60) days.



8. ASSIGNABILITY. Neither this Agreement nor any part hereof shall be assignable
by either party  without the prior,  express,  written  permission  of the other

                                       10


party,  which  permission  shall not be  unreasonably  withheld or delayed.  Any
attempted  assignment  without such consent shall be void.  Notwithstanding  the
preceding two sentences,  any party may assign this Agreement to an Affiliate or
in connection with the merger, consolidation,  transfer or sale of substantially
all of its assets relating to this Agreement.

9. NOTICES.  All notices  required or permitted to be given under this Agreement
shall be in writing and shall be mailed by registered or certified mail, postage
prepaid and receipt requested, addressed to the signatory to whom such notice is
required  or  permitted  to be given  or sent by  facsimile  or when  personally
delivered.  All  notices  shall be deemed to have been  given  when  mailed,  as
evidenced  by the return  receipt or, when sent by  facsimile,  as  evidenced by
acknowledgment  of transmission,  or by overnight  delivery e.g.,  Express Mail,
Fed. Ex., UPS, DHL, with receipt in good order requested and received.
                  To Immunomedics:

                                    Robert J. DeLuccia
                                    President and CEO
                                    Immunomedics, Inc.
                                    300 American Road
                                    Morris Plains, New Jersey 07950
                                    Facsimile: 973-605-8282


                  To IBC:

                                    IBC Pharmaceuticals, Inc.
                                    c/o  Dr. David Goldenberg
                                    Immunomedics, Inc.
                                    300 American Road
                                    Morris Plains, New Jersey 07950
                                    Facsimile: 973-605-8311


Any party may, by written  notice to the others,  designate a new  addressee  or
address to which  notices to the party  giving the notice  shall  thereafter  be
mailed or sent by facsimile.

10. SEVERABILITY. If a court of competent jurisdiction declares any provision of
this Agreement  invalid or  unenforceable,  or if any government or other agency
having jurisdiction over either  Immunomedics,  or IBC deems any provision to be
contrary to any laws,  then that provision shall be severed and the remainder of
the Agreement shall continue in full force and effect.  To the extent  possible,

                                       11


the parties shall revise such invalidated provision in a manner that will render
such provision valid without impairing the parties' original interests.

11. ENTIRE AGREEMENT.  This instrument contains the entire Agreement between the
parties  relative to its subject matter.  No verbal  agreement,  conversation or
representation  between any officers,  agents or employees of the parties hereto
before the execution of this  Agreement  shall affect or modify any of the terms
or obligations herein contained.

12. MODIFICATIONS IN WRITING. No change, modification, extension, termination or
waiver of this Agreement,  or any of the provisions herein  contained,  shall be
valid unless made in writing and signed by a duly authorized  representative  of
each party.

13.  GOVERNING  LAW. The validity and  interpretation  of this Agreement and the
legal  relations of the parties to it shall be governed by the laws of the State
of New Jersey, excluding New Jersey's conflict of laws principles

14.  CONSTRUCTION.  The parties agree that they have participated equally in the
formation  of this  Agreement  and that the  language  herein  should  be not be
presumptively construed against any of them.

15.      ARBITRATION.

         15.1 Any  controversy  or claim  arising  out of, or  relating  to this
Agreement  shall be resolved by final and binding  arbitration in Morris Plains,
New Jersey under the Commercial  Arbitration  Rules of the American  Arbitration
Association then obtaining.

         The arbitration shall be subject to the following terms:

                  (a)      The  number of arbitrators  shall be three (3) unless
otherwise agreed to by the parties to the dispute.

                  (b) The arbitrators  shall each be an  independent,  impartial
third party having no direct or indirect  personal or financial  relationship to
either of the parties to the dispute,  who has agreed to accept the  appointment
as arbitrator on the terms set forth in this Article 15.

                  (c)  The  arbitrators  shall  each  be an  active  or  retired
attorney,  law  professor  or  judicial  officer  with at least  five (5)  years
experience in general  commercial  matters and a familiarity with the technology
relating to this  agreement and with the laws  governing  proprietary  rights in
intellectual property to the extent necessary to adjudicate the dispute.

                  (d) The arbitrators shall be selected as follows:

                                       12


                           (i)      Within   thirty  (30)  days of a request for
arbitration made by either party,  Immunomedics  shall select one arbitrator and
IBC shall select one  arbitrator and these two  arbitrators  shall then agree on
the selection of a third arbitrator.

                           (ii)     If  the  method  of  selection  set  out  in
Section  15.1(d)(i)  fails for any reason,  then either  party may  petition the
American   Arbitration   Association  for  appointment  of  the  arbitrators  in
accordance  with its rules,  provided  that the  arbitrators  must  satisfy  the
requirements of (b) and (c) above.

                   (e) The dispute  shall be submitted to the three  arbitrators
within  ninety  (90) days after  they have been  selected.  A decision  shall be
rendered within sixty (60) days after the dispute is submitted.

                   (f) The  arbitrators  shall  render  a  decision  in  writing
accompanied by written  findings  explaining the facts  determined in support of
the decision and any relevant conclusions of law.

                   (g) The fees of the  arbitrators and any other costs and fees
associated with the arbitration shall be paid in accordance with the decision of
the arbitrators.

                   (h) The  arbitrators  shall have no power to add to, subtract
from, or modify any of the terms or conditions of this  Agreement.  Any decision
rendered  in such  arbitration  may be  enforced  by either  party in the United
States  District  Court  for the  Northern  District  of New  Jersey,  to  whose
jurisdiction  for such  purposes the parties to the dispute  hereby  irrevocably
consent and submit.

16. FURTHER ASSURANCES.  Each party agrees to furnish, upon request of the other
party,  such  further  information  as may be  required  to give  effect  to the
transactions  contemplated  by this  Agreement and to permit each party to fully
enjoy the benefit of the rights and grants  provided  hereunder.  In the event a
party makes a good faith  determination that it is necessary for the other party
to take  certain  additional  actions  to give full  effect to the  transactions
contemplated  by this  Agreement  and to permit  each  party to fully  enjoy the
benefit of the rights transferred  hereunder,  such party shall notify the other
of its  determination and the parties agree to meet to discuss in good faith the
possibility of such additional actions being taken.

17.      CONFIDENTIALITY

         17.1 Non-Disclosure and Non-Use of Confidential  Information.  Anything
in this  Agreement to the contrary  notwithstanding,  all  knowledge,  know-how,
practices,   process  or  other   information   (hereinafter   referred   to  as
"Confidential Information") disclosed or submitted, either orally, in writing or
in other  tangible  or  intangible  form  which is  designated  as  Confidential
Information by either party to the other shall be received and maintained by the
receiving  party in strict  confidence  and shall not be  disclosed to any third

                                       13


party,  except that  disclosure may be made to Coulter  Corporation  and Beckman
Coulter Inc.  (hereinafter  collectively  "Coulter"),  and  Immunotech  S.A. and
Immunotech  Partners,   S.A.   (hereinafter   collectively   "Immunotech")  with
disclosing  parties  assuring  that Coulter and  Immunotech,  shall abide by the
obligations  of this Article 17. Oral  disclosures of  Confidential  Information
which the  disclosing  party wishes to be maintained  in  confidence  under this
Article 17 shall be reduced to writing within  fourteen (14) days of disclosure.
Furthermore,  neither  party  shall  use the  Confidential  Information  for any
purpose other than those purposes  specified in this Agreement.  The parties may
disclose  Confidential  Information  to the  minimum  number of their  employees
reasonably  requiring  access  thereto  for  the  purposes  of  this  Agreement,
provided,  however, that prior to making any such disclosures each such employee
or other  recipient  shall be  apprised of the duty and  obligation  to maintain
Confidential  Information  in  confidence  and  not  to  use  such  Confidential
Information  for any  purpose  other  than in  accordance  with  the  terms  and
conditions  of  this  Agreement.  The  confidentiality   obligation  under  this
paragraph shall survive the expiration or early termination of this Agreement.

         17.2     Limitation on Confidentiality

                  17.2.1 Subject to Section  17.2.2,  nothing  contained  herein
will in any way restrict or impair  either  party's right to use,  disclose,  or
otherwise deal with any Confidential Information which:

                           (i)  At   the   time  of  its  receipt  is  generally
available to the public or thereafter becomes available to the public through no
act or failure to act of the receiving party; or

                           (ii) Was independently known prior to receipt thereof
as shown by written  records,  or thereafter is made available to such receiving
party as a matter of lawful  right by a third party who does not require that it
be maintained confidential.

                           (iii) Is  thereafter  independently  developed by the
receiving party without use of or access to the Confidential  Information of the
disclosing party.

                  17.2.2 If any designated Confidential  Information received by
a party is believed to be exempt from the confidentiality  obligation of Section
17.2.1,  the receiving party shall notify the disclosing party in writing within
ten (10) days of receipt  and shall  provide  documentation  substantiating  the
claim for  exemption,  failing which the  purported  exemption is waived and the
confidentiality  obligation  of Section  17.2.1 shall  continue to apply to such
designated Confidential Information.

18.  COUNTERPARTS.  This Agreement may be executed in one or more  counterparts,
each of which shall be an original  and all of which shall  constitute  together
the same document.

                                       14



         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed in duplicate by their duly authorized  representatives  as of the dates
noted below.








IMMUNOMEDICS, INC.                          IBC PHARMACEUTICALS, L.L.C.



By: ____________________________            By:  ___________________________
       Robert J. DeLuccia
Title: President and CEO                    Title:


Date:___________________________            Date:___________________________



I agree to the provisions of Section 4.1.2 of this Agreement.


________________________________
David M. Goldenberg, Sc.D., M.D.


Date:___________________________







                                    EXHIBIT 1

                          IMMUNOMEDICS PATENT PROPERTY

(a)      U.S. PATENTS:

         US 4,818,709

(b)      U.S. PATENT APPLICATIONS:

         US 08/318,157 (now allowed - to issue 2/25/99)

(c)      CORRESPONDING FOREIGN PATENTS AND APPLICATIONS

         Japan 2,598,893, Japan 254809/94 (Div.), Japan 8-512588

         Australia 629,213, Australia 582,731, Australia 37196/95

         Canada 1,274,794, Canada 2,200,868

         Israel 70746

         EPO  131,627,   (Austria,   Belgium,  France,  G. Britain,  W. Germany,
         NetherlandS, Luxembourg, Sweden, Switzerland/Liechtenstein)

         EPO 95935020.8







                                    EXHIBIT 2

                           IMMUNOTECH PATENT PROPERTY


I.       PRIORITY PATENT APPLICATIONS:

         A.  PRIORITY PATENT APPLICATIONS:

         1.       FRENCH  PATENT  APPLICATION  NO. 8613146  FILED  SEPTEMBER 19,
1986, AND GRANTED AS FRENCH PATENT NO.  2604092,  ON APRIL 13, 1990 AND ENTITLED
"AFFINITY ENHANCEMENT  IMMUNOLOGICAL  REAGENTS FOR IN VIVO DETECTION AND KILLING
OF  SPECIFIC  TARGET  CELLS"  AND  ASSIGNED  TO  IMMUNOTECH,  S.A.  (HEREINAFTER
"AFFINITY ENHANCEMENT PATENT")

         2.       FRENCH  PATENT  APPLICATION   NO. 8912622 FILED  SEPTEMBER 21,
1989, AND GRANTED AS FRENCH PATENT NO. 2652004, ON OCTOBER 28, 1994 AND ENTITLED
"HYDROPHILIC  DERIVATIVES,  THEIR  APPLICATION TO DIAGNOSIS AND TO THERAPEUTICS,
DIAGNOSTIC  OR  THERAPEUTIC  KITS  AND  IMMUNOLOGICAL   REAGENTS"   (HEREINAFTER
"HYDROPHILIC DERIVATIVES PATENT")

         3.       FRENCH  PATENT  APPLICATION   NO.  9213267  FILED  OCTOBER 27,
1992,  AND GRANTED AS FRENCH  PATENT NO.  2697255 ON JANUARY  13, 1995  ENTITLED
"TECHNETIUM  OR  RHENIUM-BINDING  BI-HAPTEN  DERIVATIVES,  A  PROCESS  FOR THEIR
PREPARATION,  DIAGNOSTIC AND THERAPEUTIC APPLICATION, AND KITS AND IMMUNOLOGICAL
REAGENTS  CONTAINING  THE SAME"  ASSIGNED TO  IMMUNOTECH  PARTNERS  (HEREINAFTER
"TECH-RHE BIVALENT HAPTENS PATENT")

         B. CORRESPONDING FOREIGN PATENTS AND APPLICATIONS:

         1. CORRESPONDING TO AFFINITY ENHANCEMENT PATENT

                  (a)     EUROPEAN  PATENT   NO.  263046 GRANTED APRIL 15, 1992.
         NATIONALIZED IN  AUSTRIA AS PATENT NO. 74769,  GERMANY AS PATENTSCHRIFT
         NO. 3778281 AND SPAIN AS PATENT NO. 2032468.

                  (b)     AUSTRALIAN PATENT NO. 613318, ACCEPTED AUGUST 1, 1991.

                  (c)     CANADIAN PATENT NO. 1306414, GRANTED AUGUST 18, 1992.

                  (d)     FRENCH  PATENT NO. 2604092, GRANTED APRIL 13, 1990.



                  (e)     JAPANESE  PATENT APPLICATION NO. 2612454, EXAMINED MAY
         21, 1997.

                  (f)     KOREAN  PATENT  APPLICATION NO. 9005622, EXAMINED JULY
         31, 1990.

                  (g)     U.S. PATENT NO. 5,256,395 GRANTED OCTOBER 26, 1993.

         2. CORRESPONDING TO HYDROPHILIC DERIVATIVE PATENT

                  (a)     EUROPEAN PATENT NO. 419387, GRANTED NOVEMBER 20, 1996.
         NATIONALIZED  IN  AUSTRIA  AS PATENT NO. 145338 AND SPAIN AS PATENT NO.
         2094750.

                  (b)     AUSTRALIAN PATENT NO. 638488, ACCEPTED JULY 1, 1993.

                  (c)     CANADIAN PATENT NO. 2025607, GRANTED MARCH 22, 1991.

                  (d)     FRENCH PATENT NO. 2652004, GRANTED OCTOBER 28, 1994.

                  (e)     GERMAN PATENT PUBLICATION NO. 69029184, PUBLISHED JUNE
         5, 1997.

                  (f)     JAPANESE  PATENT  APPLICATION NO. 3173900, UNEXAMINED,
         JULY 29, 1991.

                  (g)     U.S. PATENT NO. 5,274,076 ISSUED DECEMBER 28, 1993.

         3. CORRESPONDING TO TECH-RHE BIVALENT HAPTENS PATENT

                  (a)     EUROPEAN PATENT PUBLICATION NO. 595743,  PUBLISHED MAY
         4, 1994.

                  (b)     AUSTRALIAN PATENT APPLICATION NO. 669219, ACCEPTED MAY
         30, 1996.

                  (c)     CANADIAN PATENT NO. 2109256, GRANTED APRIL 28, 1994.

                  (d)     JAPANESE  PATENT APPLICATION NO.  6321809, UNEXAMINED,
         NOVEMBER 22, 1994.