AGOURON PHARMACEUTICALS INC
10-K/A, 1998-08-07
PHARMACEUTICAL PREPARATIONS
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                UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                    FORM 10-K/A
                          Amendment No. 1 to Form 10-K
(Mark One)
  X ANNUAL REPORT  PURSUANT TO SECTION 13 OR 15(d) OF THE  SECURITIES  EXCHANGE
    ACT OF 1934 For the fiscal year ended June 30, 1998
                                       OR
   TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE 
    ACT OF 1934

Commission file number 0-15609

                          Agouron Pharmaceuticals, Inc.
             (Exact name of registrant as specified in its charter)


          California                                      33-0061928
(State or other jurisdiction of              (I.R.S. EmployerIdentification No.)
 incorporation or organization)

10350 North Torrey Pines Road, La Jolla, California                92037-1020
(Address of principal executive offices)                           (Zip Code)

Registrant's telephone number, including area code:              (619) 622-3000

Securities registered pursuant to Section 12(b) of the Act:                None

Securities registered pursuant to Section 12(g) of the Act:

                         Common Stock, without par value
                                (Title of class)

     Indicate  by check mark  whether the  registrant  (1) has filed all reports
required to be filed by Section 13 or 15(d) of the  Securities  Exchange  Act of
1934  during  the  preceding  12 months  (or for such  shorter  period  that the
registrant  was required to file such  reports) and (2) has been subject to such
filing requirements for the past 90 days. Yes X No
                                             ---

     Indicate by check mark if disclosure of delinquent  filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's  knowledge,  in definitive proxy or information  statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. [ ]

     On July 28, 1998,  the  aggregate  market value of the common stock held by
nonaffiliates  totaled  approximately  $724,738,000  based on the closing  stock
price as reported by The Nasdaq Stock Market.

     On July 28,  1998,  there were  approximately  31,097,000  shares of common
stock, without par value, of the registrant issued and outstanding.

                       DOCUMENTS INCORPORATED BY REFERENCE

         The registrant's  definitive proxy statement to be prepared pursuant to
Regulation  14A and filed in  connection  with  solicitation  of proxies for its
Annual Meeting of Stockholders,  to be held on October 28, 1998, is incorporated
by reference into Part III of this Form 10-K.

                                       1
<PAGE>


                                     PART IV


Item 14.      EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K

 (a)          List of documents filed as part of this report:

              (1)     Financial Statements and Supplementary Data
                      Reference is made to the Index to Financial Statements and
                      Schedules  under  Item 8 in Part II  hereof,  where  these
                      documents are listed.
              (2)     Exhibits - see (c) below

 (b)          Reports on Form 8-K

     No reports on Form 8-K were filed during the fourth quarter of fiscal 1998.

(c)           Exhibits

         Exhibit
         Number                             Exhibit
         --------     ----------------------------------------------------------

           2.1(a)     Agreement and Plan of Reorganization dated as of April 28,
                      1997,  between  Agouron  Pharmaceuticals,   Inc.,  Agouron
                      Acquisition Corporation and Alanex Corporation.
           3.1(b)     Restated Articles of Incorporation (December 10, 1992).
           3.2(c)     Amended and Restated Bylaws (Restated June 17, 1991).
           4.1(d)     Rights  Agreement  dated  November 7, 1996,  as amended on
                      November  27,  1996,  between the Company and Chase Mellon
                      Shareholder  Services.  L.L.C., which includes, as Exhibit
                      A,  the  Certificate  of  Determination,  Preferences  and
                      Rights of Series B Participating  Preferred Stock as filed
                      with the  California  Secretary  of State on November  20,
                      1996.
         10.01(h)     1990 Stock Option Plan (Restated November 2, 1995).
         10.02(k)     Form of 1990 Incentive Stock Option Agreement.
         10.03(k)     Form of 1990 Non-Statutory Stock Option Agreement for 
                      Employees/Officers/Directors.
         10.04(k)     Form of 1990 Non-Statutory Stock Option Agreement for 
                      Consultants.
         10.05(c)     1985 Stock Option Plan (Last Amended August 14, 1991).
         10.06(e)     Agouron Pharmaceuticals, Inc. 401(k) Plan
                      (Amended August 1992).
         10.07(b)     Agouron Pharmaceuticals, Inc. Employee Stock Purchase Plan
                      (October 15, 1992).
         10.08(b)     Agouron Pharmaceuticals, Inc. Flexible Benefits Plan 
                      (December 10, 1992).
         10.09(f)     Agreement  Two  dated  February  28,  1994  between  Japan
                      Tobacco  Inc.  and  the  Company.
                      (Portions of the agreement receive confidential  treatment
                      pursuant to an application  filed April 25, 1994; File No.
                      0-15609).

                                       35
<PAGE>


         Exhibit
         Number                             Exhibit
         --------     ----------------------------------------------------------

         10.10(g)     Development  and License  Agreement dated December 1, 1994
                      between  Japan  Tobacco Inc. and the Company  (Portions of
                      the agreement receive  confidential  treatment pursuant to
                      an application dated January 31, 1995).
         10.11(h)     First  Amendment  to  Development  and  License  Agreement
                      effective  December 1, 1994 between Japan Tobacco Inc. and
                      the Company.  (Confidential  treatment has been  requested
                      for portions of this agreement  pursuant to an application
                      dated January 31, 1996. The underlying agreement was filed
                      as  Exhibit  10.54  on  Form  10-Q  for the  period  ended
                      December  31,   1994,   and   portions   thereof   receive
                      confidential   treatment  pursuant  to  an  order  of  the
                      Securities and Exchange Commission dated June 28, 1995.)
         10.12(i)     Amendment effective January 1, 1996 to the Agouron
                      Pharmaceuticals, Inc. 401(k) Plan.
         10.13(j)     1996 Stock Option Plan.
         10.14(j)     Form of 1996 Incentive Stock Option Agreement.
         10.15(j)     Form  of  1996  Non-Statutory   Stock  Option  Agreement
                      for Employees/Officers/Directors.
         10.16(j)     Form  of  1996  Stock  Option
                      Agreement for Consultants  10.17(l) Second Amendment to 
                      Development and License Agreement effective January 17, 
                      1997 between Japan   Tobacco  Inc.   and  the  Company
                      (Confidential treatment   has  been   requested  for  
                      portions  of  this agreement  pursuant  to an  application
                      dated  August 21, 1997, as separately filed with the
                      Securities and Exchange Commission.  The underlying 
                      agreement was filed as Exhibit 10.54 on Form 10-Q for the
                      period ended December 31, 1994, and  portions  thereof  
                      receive   confidential   treatment pursuant  to an  orde
                      of  the  Securities  and  Exchange Commission dated
                      June 28, 1995.)
         10.18(l)     Third  Amendment  to  Development  and  License  Agreement
                      effective  December 1, 1996 between Japan Tobacco Inc. and
                      the Company.  (Confidential  treatment has been  requested
                      for portions of this agreement  pursuant to an application
                      dated  August  21,  1997,  as  separately  filed  with the
                      Securities   and  Exchange   Commission.   The  underlying
                      agreement  was filed as Exhibit 10.54 on Form 10-Q for the
                      period  ended  December 31,  1994,  and  portions  thereof
                      receive confidential treatment pursuant to an order of the
                      Securities and Exchange Commission dated June 28, 1995.)
         10.19(l)     VIRACEPT License  Agreement  between the Company and Japan
                      Tobacco Inc. and F.  Hoffmann-La  Roche Ltd dated June 30,
                      1997.  (Confidential  treatment  has  been  requested  for
                      portions  of this  agreement  pursuant  to an  application
                      dated  August  21,  1997,  as  separately  filed  with the
                      Securities and Exchange Commission.)
         10.20(m)     Form of 1998 Employee Stock Option Plan.
         10.21(m)     Form of 1998 Employee Non-Statutory Stock Option
                      Agreement.


                                       36
<PAGE>


         Exhibit
         Number                             Exhibit
         --------     ----------------------------------------------------------

         10.22        License and Supply Agreement between the Company and Japan
                      Energy   Corporation   effective  as  of  June  30,  1998.
                      (Confidential treatment has been requested for portions of
                      this agreement  pursuant to an application dated August 4,
                      1998, as separately filed with the Securities and Exchange
                      Commission.)
         10.23        Common  Stock  Purchase   Agreement   between  The  Immune
                      Response  Corporation and the Company dated June 11, 1998.
                      (Confidential treatment has been requested for portions of
                      this agreement  pursuant to an application dated August 4,
                      1998, as separately filed with the Securities and Exchange
                      Commission.)
         10.24        Amendment to the VIRACEPT  License  Agreement  between the
                      Company and Japan  Tobacco Inc. and F.  Hoffmann-La  Roche
                      Ltd as of May 1, 1998.  (Confidential  treatment  has been
                      requested  for portions of this  agreement  pursuant to an
                      application dated August 4, 1998, as separately filed with
                      the Securities and Exchange Commission.)
         21/#/        Subsidiaries of Agouron Pharmaceuticals, Inc.
         23.1/#/      Consent of Independent Accountants.
         27/#/        Financial  Data  Schedule.  (Exhibit 27 is  submitted  as
                      an exhibit  only in the  electronic format of this  Annual
                      Report on Form 10-K submitted to the Securities and
                      Exchange Commission.)
         99/#/        Important Factors Regarding Forward-Looking Statements.

     #  Previously filed

     (a) Incorporated by Reference to Form 8-K filed on May 23, 1997.
     (b)  Incorporated  by  Reference  to Form 10-Q filed for the quarter  ended
     December 31, 1992. (c) Incorporated by Reference to Form 10-K filed for the
     year ended June 30, 1991.  (d)  Incorporated  by  Reference  for Form 8-K/A
     filed on December  20,  1996.  (e)  Incorporated  by Reference to Form 10-K
     filed for the year ended June 30, 1992.  (f)  Incorporated  by Reference to
     Form 10-Q/A filed for the quarter ended March 31, 1994. (g) Incorporated by
     Reference to Form 10-Q filed for the quarter ended  December 31, 1994.  (h)
     Incorporated by Reference to Form 10-Q filed for the quarter ended December
     31, 1995. (i)  Incorporated by Reference to Form 10-Q filed for the quarter
     ended March 31, 1996.  (j)  Incorporated  by Reference to Form S-8 filed on
     November  26,  1996.  (k)  Incorporated  by  Reference to Form 10-Q for the
     quarter ended December 31, 1996. (l) Incorporated by Reference to Form 10-K
     for the year ended June 30, 1997. (m) Incorporated by Reference to Form S-8
     filed on February 19, 1998.

                                       37
<PAGE>


                                   Signatures

     Pursuant  to the  requirements  of  Section  13 or 15(d) of the  Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized.
                                   AGOURON PHARMACEUTICALS, INC.

August 7, 1998                     By:  /s/ Steven S. Cowell
                                   ---------------------------------
                                   Steven S. Cowell
                                   Corporate Vice President
                                   Chief Financial Officer


                                       38
<PAGE>

  PORTIONS OF THIS DOCUMENT HAVE BEEN OMITTED (DESIGNATED BY AN ASTERISK (*)
     AND WHITE SPACE) AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
          COMMISSION PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT
                     DATED AUGUST 4, 1998; FILE NO. 0-15609


                          LICENSE AND SUPPLY AGREEMENT

     This License and Supply Agreement ("Agreement"),  effective as of the 30th
day of June 1998, is by and between Japan Energy Corporation, a corporation duly
organized and existing under the laws of Japan and having its principal place of
business  at  10-1,  Toranomon  2-chome,   Minato-ku,   Tokyo  105-8407,   Japan
(hereinafter  referred  to  as  "JE"),  and  Agouron  Pharmaceuticals,  Inc.,  a
corporation  duly  organized  and  existing  under  the  laws  of the  State  of
California,  U.S.A.,  and having its principal  place of business at 10350 North
Torrey Pines Road, La Jolla,  California 92037, U.S.A.  (hereinafter referred to
as "Agouron").  JE and Agouron are sometimes  hereinafter  each referred to as a
Party (collectively "Parties") to this Agreement.

                          BACKGROUND

     JE possesses  technical  information  and know-how  pertaining to a certain
pharmaceutical compound designated JE-2147 and its related compounds that may be
useful  in  the  treatment  and  prevention  of  Human   Immunodeficiency  Virus
infections and other diseases.

     The Parties entered into a Confidentiality Agreement effective December 31,
1997  (the  "Confidentiality  Agreement")  and  a  Material  Transfer  Agreement
effective  December 31, 1997 (the "Material  Transfer  Agreement"),  pursuant to
which Agouron has undertaken certain evaluations of JE-2147.

     JE holds patents rights pertaining to JE-2147 and its related compounds.

     Agouron  desires to obtain a license  from JE to enable  Agouron to develop
and commercialize  Product (as hereinafter  defined) in certain countries of the
world,  and JE is  willing to grant  such  license  on the terms and  conditions
hereinafter  set forth.

     The Parties wish to cooperate under the terms of this Agreement to optimize
the development and commercialization of Product.

     The Parties also wish to confirm their arrangement  regarding the supply of
Compound by JE to Agouron and the supply of Product by Agouron to JE (both terms
as hereinafter defined).

     On June 30,  1998,  the parties  executed and  delivered to each other,  by
telefax,  a prior version of this  Agreement.  The parties now wish to supersede
such prior  version of this  Agreement  and to formally  enter into this revised
version of this Agreement.

     NOW, THEREFORE, in consideration of the premises, and the mutual covenants,
benefits and obligations set forth herein, the Parties agree as follows:
<PAGE>


                        ARTICLE I - DEFINITIONS

     When used in this  Agreement,  the following  terms shall have the meanings
set  out in this  Article  I.  Except  as  otherwise  explicitly  provided,  all
references to Articles and Sections  shall refer to the Articles and Sections of
this Agreement, and all references to Attachments,  Exhibits and Schedules shall
refer to the Attachments, Exhibits and Schedules to this Agreement, all of which
are incorporated herein by reference.

     Section 1.01 "Affiliate"  means any person, organization or entity that is,
directly or indirectly, controlling, controlled by, or under common control with
JE or  Agouron,  as the  case  may  be.  The  term  "control"  (including,  with
correlative meaning, the terms "controlled by" and "under common control with"),
as  used  with  respect  to  any  person,  organization  or  entity,  means  the
possession,  directly  or  indirectly,  of the  power to  direct,  or cause  the
direction  of, the  management  and  policies of such  person,  organization  or
entity,  whether through the ownership of voting  securities,  or by contract or
court  order or  otherwise.  The  ownership  of voting  securities  of a person,
organization  or entity shall not, in and of itself,  constitute  "control"  for
purposes  of this  definition,  unless  said  ownership  is of a majority of the
outstanding securities entitled to vote of such person,  organization or entity.
Affiliate shall also mean a limited partnership in which a subsidiary of Agouron
and/or JE is a general partner.

      Section 1.02      "Combination Product" means *



     Section 1.03  "Compound"  means the chemical compound known by the JE code
name JE-2147 ("JE-2147"), whose chemical structure is as follows:
                                                         *

                          (chemical structure)




The definition of Compound also means:  (i) *



     Section  1.04  "Compound  Supply Plan" means the supply plan under which JE
will provide  Compound to Agouron in accordance  with the  provisions of Section
4.04.

     Section 1.05      "Control," "Controlled" or "Controlling" means *




                                       2
<PAGE>



     Section 1.06      "Development Program" means *














      Section 1.07      "Development Program Patent Rights" means *


















        Section 1.08      "Development Program Technology" means *











                                       3
<PAGE>



     Section 1.09  "Dossier"  means the document that is filed with and approved
by a government or health authority for purposes of Registration, for example, a
Marketing Authorization Application.

     Section 1.10   "Effective Date" means June 30, 1998.

     Section  1.11  "EMEA"  means the  European  Agency  for the  Evaluation  of
Medicinal Products.

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

     Section 1.13   "Field" means *


     Section 1.14 "Initial Commercial Sale" means the first commercial sale of a
Product *



     Section  1.15 "JE  Territory"  means Japan,  Taiwan,  South Korea and North
Korea.

     Section 1.16 "JE Patent Rights" means: *






     Section 1.17 "JE Technology" means *








     Section 1.18 "Licensed  Territory" means all countries of the world, except
for Japan, Taiwan, South Korea and North Korea.

     Section 1.19 "MAA" means Marketing Authorization Application.



                                       4
<PAGE>


     Section 1.20 "Major  Market  European  Country"  means the United  Kingdom,
France, Germany, Spain or Italy.

     Section  1.21 "Net Sales"  means the gross  amount  invoiced for Product by
Agouron, its Affiliates and sublicensees to non-Affiliated third parties,  other
than separately itemized  transportation  costs, and sales taxes and other taxes
that are  directly  linked to and  included  in the gross  amount  invoiced,  as
computed on a product-by-product basis for the countries concerned, less: *







     Section 1.22 "New Drug  Application" or "NDA" means a new drug application,
product license application or comparable  regulatory submission to the FDA, the
EMEA or an equivalent  agency of a country in the  Territory  for  permission to
commence commercial sale of a Product.

     Section 1.23 "Patent Rights" means, collectively, *


     Section 1.24     "Product" means any *



     Section 1.25  "Registration"  means the official approval by the government
or health authority in a country (or  supra-national  organization,  such as the
European Agency for the Evaluation of Medicinal Products) that is required for a
Product to be offered for sale in such country, including such authorizations as
may be required for the production, importation, pricing, reimbursement and sale
of such  Product,  and for  subsequent  regulatory  filings for line  extensions
and/or additional indications of such Product.

     Section 1.26 "Territory" means *

     Section 1.27 "Trade  Dress" means any  materials  directly  supporting  the
commercialization  of a  Product,  including,  but not  limited  to,  packaging,
package inserts,  advertising or selling aids, brochures,  mailings and/or other
marketing or packaging materials.

     Section 1.28  "Trademark(s)"  means any  trademark  selected and owned by a
Party and  registered  (or applied  for) by such  Party,  its  Affiliate(s)  and
sublicensee(s)  in the  Territory  for use in  connection  with the marketing of
Products.  The  definition  of  Trademark(s)  shall not refer to trade  names or
designs such as logos used by a Party to designate the name of such Party.


                                       5
<PAGE>


     Section 1.29 "United  States" or "U.S." means the United States of America,
its territories,  possessions and protectorates (including Puerto Rico), and the
District of Columbia.

     Section 1.30 "Valid Claim" means a *




                        ARTICLE II - COMMERCIAL RIGHTS

     Section   2.01  License   Grants.   To  implement   the   development   and
commercialization of Compound and/or Products, the Parties, subject to the other
applicable  provisions of this  Agreement,  grant and accept the license  rights
provided below in this Article II.

     (a) Subject to the provisions of Section 2.01(c),  and Article V, JE grants
Agouron the exclusive right,  even as to JE (with right of sublicense),  to use,
offer for sale, sell and/or import in or into the Licensed  Territory,  Compound
and Products under  applicable JE Patent Rights and  Development  Program Patent
Rights, and using applicable JE Technology and Development Program Technology.

     (b) *















     (c) *










                                       6
<PAGE>





     (d) *





     (e) Agouron grants JE *




     (f) Agouron grants JE *









     (g) Agouron grants JE *











                                       7
<PAGE>






     (h) Subject to the provisions of Section 4.04, Agouron shall have *




     Subject to the provisions of Section 4.04, JE shall have a *











     (i) *












     (j) *








     (k) *







                                       8
<PAGE>





     (l) Agouron  agrees to use  reasonable  efforts to not sell  Product in the
Licensed  Territory to persons who it knows,  or has reason to know, will resell
and/or transfer such Product outside of the Licensed Territory.

     Section 2.02 Discontinuance of the Development Program

     (a) Agouron  shall,  in a timely manner,  use  reasonable  diligence in the
development  and  Registration  of a  Product  in  the  Field  in  the  Licensed
Territory.  Reasonable  diligence  means a commercially  reasonable  standard of
effort  based on the  commercial  potential  for such  Product  in the  Licensed
Territory.   Development   efforts   undertaken  by  Agouron's   Affiliates  and
sublicensees shall be attributed to Agouron. *













     (b) *
















                                       9
<PAGE>




     Section 2.03 Diligent Efforts to Market *


















           ARTICLE III - SHARING AND PROTECTION OF INTELLECTUAL PROPERTY

     Section 3.01 Patents.

     (a) *



















                                       10
<PAGE>


     (b) *








     (c) *










     (d) *











     (e) *









                                       11
<PAGE>



     (f) *





     (g) *













     (h) *


















     (i) *




                                       12
<PAGE>



     (j) *









     (k) *






















     (l) *



     Section 3.02  Infringement  of Patents of Third  Parties.  Each Party,  its
Affiliates and sublicensees, and their respective employees and agents shall use
diligent efforts to avoid known 


                                       13
<PAGE>

infringement  of patents of any third party *



































          Section 3.03 Trademarks. *







                                       14
<PAGE>













          Section 3.04 Information Exchange. *











          Section 3.05 Confidentiality.  Except as otherwise expressly specified
     in this Agreement and except for the proper  exercise of any license rights
     granted or rights reserved under this Agreement,  JE and Agouron shall each
     keep in  confidence  and  shall  each use its  best  efforts  to cause  its
     respective Affiliates,  employees, directors, agents, consultants, clinical
     research  associates,  outside  contractors,   clinical  investigators  and
     sublicensees  to whom it is permitted to disclose  information  pursuant to
     the terms of this  Agreement to retain in confidence all  confidential  and
     proprietary information of the other Party, including the *



          Without limiting the foregoing, JE and Agouron shall each exercise the
     same  degree of  diligence  and care with  respect  to the  above-described
     information  as  it  exercises  with  respect  to  its  other   proprietary
     information.  Each Party  represents  to the other Party that it  maintains
     policies and procedures designed to prevent the unauthorized  disclosure of
     its proprietary data and information. *






                                       15
<PAGE>






          The preceding  obligations  of  confidentiality  shall be waived as to
     information  that the  Party  claiming  waiver  can  demonstrate,  based on
     written  records:  (i) was in the public  domain at the time of  disclosure
     hereunder;  (ii) comes into the public domain through no fault of the Party
     claiming waiver;  (iii) was known to the Party claiming waiver prior to its
     disclosure under this Agreement,  unless such information was obtained from
     the  other  Party  on  a  confidential   basis;  (iv)  is  disclosed  on  a
     non-confidential basis to the Party claiming waiver by a third party having
     a lawful right to make such disclosure on a non-confidential  basis; (v) is
     published  with the prior mutual  agreement  of the  Parties,  after having
     given consideration to appropriate  commercial factors; (vi) comes into the
     public domain through governmental publication of a patent application;  or
     (vii) is  required  to be  disclosed  to file a patent or other  regulatory
     application or to comply with applicable laws and regulations. *



          The  Parties  acknowledge  and  agree  that the  Parties'  rights  and
     obligations under the  Confidentiality  Agreement and the Material Transfer
     Agreement  between the Parties which were both  originally  entered into on
     December 22, 1997 are hereby  superseded by the  provisions of this Section
     3.05.

          Section  3.06  Publication.  JE  and  Agouron  each  acknowledges  the
     interests  of the other Party in  publishing  certain of the results of its
     development and Registration of a Product to obtain  recognition within the
     scientific community and to advance the state of scientific knowledge.  The
     Parties also  recognize  their mutual  interests in obtaining  valid patent
     protection for their drug products. Consequently, a Party, its employees or
     consultants wishing to make a publication shall *



















                                       16
<PAGE>










              ARTICLE IV - DEVELOPMENT AND COMMERCIALIZATION STRUCTURE

          Section 4.01  Coordination.  Coordination of the Parties'  development
     and  commercialization  efforts for  Compound  and Products in the Licensed
     Territory shall be carried out as specified in Sections 4.02 and 4.03.

          Section  4.02  Development  and   Registration;   Responsibility   for
     Development  Costs. JE and Agouron  acknowledge  their mutual  intention to
     cooperate in a commercially  reasonable manner in the timely development of
     Compound and Products in the  Territory.  The Parties  further  acknowledge
     their  mutual  willingness  to  discuss  ad  hoc  agreements  to  establish
     appropriate mechanisms for such cooperation.  Recognizing the importance of
     timely initiation of development activities,  however, JE and Agouron agree
     to the following  basic approach to development of Compound and Products in
     the Licensed Territory,  and to the conduct and funding of their respective
     development activities.

         (a)      *








          (b) The Parties  acknowledge  that it will be  necessary  to amend and
     update the Development Program as additional  information becomes available
     concerning the  prerequisites  necessary for Registration of Product in the
     Licensed Territory. *





                                       17
<PAGE>





          (c) As soon as possible  after the  execution of this  Agreement,  the
     Parties shall  promptly  reach  agreement on the basic terms under which JE
     will  manufacture  and supply  Compound  to  Agouron,  its  Affiliates  and
     sublicensees *



          (d) Agouron shall be responsible *







          (e) Agouron,* , shall be responsible  for submission of Dossiers for a
     Product to the regulatory  authorities in the Licensed Territory in pursuit
     of approvals to sell such Product and *


          All Dossiers for Product in the Licensed  Territory  shall be owned by
     and be in the name of Agouron.

         (f)      JE shall cooperate with Agouron to *




         (g)      JE will be responsible for *



         (h)      JE shall be responsible *



          (i) To the extent required to support Registrations of a Product (such
     as for  Investigational  New Drug Applications and New Drug  Applications),
     Agouron shall have

                                       18
<PAGE>


*





          (j) Each Party agrees to use its diligent  efforts in  responding in a
     timely manner, *






          (k) Agouron shall keep JE informed of its progress in the  development
     and Registration of Products. This information exchange shall include, *




















          (l) JE and Agouron shall each use qualified persons in the development
     activities of the Development Program.

          (m) All  work in  connection  with  the  development  of  Compound  or
     Products,  to the extent required by applicable laws or regulations,  shall
     be  conducted  in  accordance   with  Good   Laboratory   Practices,   Good
     Manufacturing  Practices  and Good  Clinical  Practices,  as such  rules of
     practice  are amended  from time to time.  Each Party in the conduct of its
     activities  shall comply with all applicable laws, rules and regulations of
     each  jurisdiction   within  the  Territory 

                                       19
<PAGE>

     that are applicable to the  development,  testing,  manufacture,  labeling,
     packaging,  storage,  marketing,  distribution,  sale,  promotion  and
     import or export of  Product.distribution,  sale, promotion and import
     or export of Product.


          (n) *



          Section 4.03 Marketing.  * JE and Agouron agree to the following basic
     approach to the marketing of Products in the Licensed Territory, and to the
     conduct  of  their  marketing  activities  in  their  respective  marketing
     territories.

         (a)      Agouron shall be responsible for *






         (b)      *




          (c) Agouron  shall keep JE informed of  Agouron's  current and planned
     marketing activities in the Licensed Territory. *

          JE shall keep Agouron informed of JE's marketing  activities in the JE
     Territory. *











          (d) Unless prohibited by law or regulation, the labeling for a Product
     in the countries in the Licensed Territory shall *

                                       20
<PAGE>




         (e)      *





          (f) Agouron and JE shall each use  qualified  persons in its marketing
     activities for a Product in its respective marketing territories.

          (g) Agouron shall be responsible for responding, in a timely manner, *















          (h) Each Party, its Affiliates and sublicensees, agrees throughout the
     duration of this Agreement to notify the other Party immediately in English
     of *













                                       21
<PAGE>









          (i) Each Party further agrees to immediately notify the other Party of
     any information *





          The information to be provided hereunder shall be provided in English.

          (j) Without  limiting the foregoing,  it is also  understood that each
     Party may notify its Affiliates or sublicensees of *

          Section  4.04  Supply  of  Compound.  It is  anticipated  that  timely
     development  of Compound  and/or a Product will require the  manufacture of
     significant  amounts  of  the  Compound,   and  that  successful  worldwide
     commercialization  of a Product will  require  annual  production  of large
     quantities of the Compound.

          (a) In accordance  with the provisions of Section 4.04,  Agouron shall
     purchase  from JE,  and JE shall  timely  deliver  Compound  for use in the
     development  and  Registration  activities  for  Compound  and/or  Product,
     including using Compound to make Product to be used in clinical studies and
     trials and for special license sales. *

















                                       22
<PAGE>





















          (b) In accordance  with the provisions of Section 4.04,  Agouron shall
     purchase  from JE, and JE shall timely  deliver  Compound for use in making
     the  finished  dosage  form(s)  of  Product  to be  sold  in  the  Licensed
     Territory, *


          (c) JE shall  maintain  books of account  and  complete  and  accurate
     records of all of its FBMCC of procuring and/or producing such Compound *












          (d) *







                                       23
<PAGE>







          (e) *


          (i)


          (ii)





          (iii)


                                       24
<PAGE>

                                                                                
          (iv) Sale and delivery of Compound  will be subject to an  agreed-upon
form of purchase order being issuedby Agouron and accepted by JE. *

                                                                                




          (v) *








          (vi) *











          (vii) *



          (f) *








                                       25
<PAGE>
 
               (i) *



               (ii) *

          (g) *















          Section 4.05 Supply of Product. The details for manufacturing  Product
     will be determined after the execution of this Agreement,  according to the
     following conditions:

          (a) Agouron shall be responsible for manufacturing Product.

          (b) *










          (c) *


                                       26
<PAGE>




          (d) *










         











          (e) *

                 (i)      *






                  (ii)     *







                                       27
<PAGE>



                  (iii)    *





                  (iv)     *










                  (v)      *




         (f)      *




         (g)      *












                                       28
<PAGE>




       (h)      *













                     ARTICLE V - ADVANCE PAYMENTS AND ROYALTIES

         Section 5.01      Advanced Payments and Royalties.

          (a)  Subject  to the terms and  conditions  of this  Agreement  and in
     consideration  for the  rights  granted to  Agouron  under this  Agreement,
     Agouron shall make the following one-time-only payments to JE:


 <TABLE>
<CAPTION>
                                                                                 PAYMENT
                          MILESTONE EVENT                                     (U.S. Dollars)
<S>                                                                            <C>                                

 (i)  Within thirty (30)days of execution of this Agreement                   $6,000,000
                                                                             
 (ii) *                                                                        *

 (iii)*                                                                        *

 (iv) *                                                                        *


 (v)  *                                                                        *

 (vi) *                                                                        *

      TOTAL PAYMENTS:                                                         $26,000,000
         *    *

</TABLE>

                                       29
<PAGE>








*











         (b)      *





          (c) The Parties agree that the  calculation of the amount of royalties
     due shall be subject to and in accordance with the following provisions:

                  (i)      *




                  (ii)     *










                  (iii)    *







                                       30
<PAGE>






                  (iv)     *





                  (v)      *









                  (vi)     *











                  (vii)    *









                  (viii)   *




                                       31
<PAGE>























         Section 5.02      General Licensing Terms.

         (a)      *








          (b) The Parties  agree that the  accounting  and payment of  royalties
     shall comply with the following terms and conditions:

                  (i)      *




                  (ii)     *







                                       32
<PAGE>







                  (iii)    *











          (iv) Agouron shall maintain and cause its Affiliates and  sublicensees
     to maintain books of account and complete and accurate  records  pertaining
     to the sale or other disposition of Products and of the royalties and other
     amounts payable under this Agreement in sufficient detail to *






















                                       33
<PAGE>



         (c)      *





         (d)      *



         Section 5.03      Foreign Currency.

          (a) Net Sales and any milestone and royalty amounts shall be stated in
     United States dollars.  Remittal of milestone  payments and royalties shall
     be made in United States dollars. *






         (b)      *


















                         ARTICLE VI - TERM AND TERMINATION

         Section 6.01      Termination for Breach  *




                                       34
<PAGE>














         Section 6.02      Termination by Agouron.

         (a)      *

















         (b)      *












                                       35
<PAGE>

         (c)      *



          Section 6.03 Termination by Mutual  Agreement.  The Parties may at any
     time  terminate  this  Agreement,  in part or in its  entirety,  by  mutual
     written agreement.

          Section 6.04 Termination Upon  Bankruptcy..  In the event that a Party
     is  subject  to  any  proceeding  under  the  bankruptcy  laws,   including
     appointment of a receiver,  trustee,  liquidator or other  custodian of its
     business  or  substantially  all of its  assets,  and such  proceeding,  if
     involuntary,  is not dismissed or discharged within one hundred fifty (150)
     days  after  such  proceeding  is  instituted,  or  upon  the  liquidation,
     dissolution,  or winding up of its business,  then this  Agreement,  at the
     election of the other Party,  shall be terminated in its entirety for cause
     upon a notice in writing of at least  fifteen  (15) days from the Party who
     is not bankrupt or insolvent.

          Section 6.05 Disposition of Inventory In the event of the cancellation
     or  termination  of any  license  rights  with  respect to a  Product,  the
     inventory  of  such  Product  may  be  sold  for  up  to *  after  date  of
     cancellation or termination,  provided the required  payments,  if any, are
     paid thereon.

         Section 6.06      Effect of Termination.  *










                    ARTICLE VII - WARRANTIES AND COVENANTS;
                   INDEMNITIES; INSURANCE; DISPUTE RESOLUTION

         Section 7.01      Warranties and Covenants.

          (a) Each Party  represents and warrants to the other Party that it has
     the legal power,  authority  and right to enter into this  Agreement and to
     perform all of its respective  obligations set forth herein,  including the
     attachments hereto.


                                       36
<PAGE>


          (b) JE  acknowledges  and  represents  that  the  patents  and  patent
     applications  listed  in  Schedule  2  are  the  only  patents  and  patent
     applications included within the JE Patent Rights that are jointly owned by
     JE and a third  party,  and that such patents and patent  applications  are
     only subject to the  conditions and  restrictions  noted on Schedule 2 and,
     except as otherwise noted on Schedule 2, that the license of such JE Patent
     Rights to Agouron  under the terms of this  Agreement  do not  require  the
     consent of such joint owner. *

          (c) JE represents  and warrants that, as of the date this Agreement is
     executed,  it was not aware of the existence of any patent  applications or
     patents owned and Controlled by a third party covering  Compound that might
     materially  prevent  the  Parties  from  commercializing  Compound  in  the
     Licensed  Territory,  except for the patent  application listed in Schedule
     7.01(c).

          (d) JE represents and warrants that: (i) it has the right to grant the
     licenses  set forth in Article  II; and (ii) there are no suits,  claims or
     proceedings  pending in any court or by or before any governmental  body or
     agency with  respect to the JE Patent  Rights or JE  Technology  that would
     materially  interfere  with the  ability of Agouron to fully  exercise  the
     licenses  granted  to it under  this  Agreement,  including  the  exclusive
     license rights under Section 2.01(a).  Agouron represents that, to the best
     of its knowledge, it does not have any know-how, trade secret, experimental
     data, formula, expert opinion, experimental procedure or other confidential
     and/or  proprietary  information   specifically  concerning  the  Compound,
     intermediates thereof, or a Product that was developed or acquired by or on
     behalf of  Agouron  before the  Effective  Date of this  Agreement  that is
     necessary for either:  (i)  the  formulation  (including  sustained-release
     formulations),  manufacture,  use and/or  application of Product;  or (ii)
     obtaining  Registration  of  Product,   including,   but  not  limited  to,
     information  and data  arising  out of  pre-clinical  and  clinical  trials
     involving Product and all NDA applications for Product,  and which is under
     the Control of Agouron.

          (e) Each Party  covenants  that it shall not commit any act or fail to
     take any action that, in any significant way, would be in conflict with its
     material obligations under this Agreement and the attachments hereto.

          (f) Each Party  promises to comply in all material  respects  with the
     terms of the  licenses  granted  to it under this  Agreement,  and with all
     federal, state, local and foreign laws, rules and regulations applicable to
     the development, manufacture,  distribution, import and export, and sale of
     pharmaceutical products pursuant to this Agreement.

          (g) EXCEPT AS OTHERWISE EXPRESSLY PROVIDED IN THIS AGREEMENT,  EACH OF
     THE PARTIES MAKES NO WARRANTIES,  EXPRESSED OR IMPLIED,  OF MERCHANTABILITY
     OR FITNESS FOR A PARTICULAR  PURPOSE OF ANY SUBJECT MATTER  INCLUDED WITHIN
     THE  CLAIMS OF THE PATENT  RIGHTS,  INCLUDING  THE  COMPOUND.  THE  PARTIES
     UNDERSTAND AND AGREE THAT  DEVELOPMENT  AND  COMMERCIALIZATION  OF COMPOUND
     AND/OR PRODUCTS WILL INVOLVE APPROVAL BY REGULATORY  AUTHORITIES,  AND THAT
     NO  PARTY IS  GUARANTEEING  THE  SAFETY  OR  EFFICACY  OF  COMPOUND  AND/OR
     PRODUCTS,  



                                       37
<PAGE>

    OR THAT  COMPOUND  AND/OR  PRODUCTS  WILL  RECEIVE THE  REQUIRED APPROVALS.


         Section 7.02      Indemnities; Insurance.


          (a) Agouron shall  indemnify and hold harmless JE and its  Affiliates,
     employees,  and agents (a "JE Indemnified  Party") from and against any and
     all liabilities,  losses, damages, costs, or expenses (including reasonable
     investigative  and  attorneys'  fees)  which the JE  Indemnified  Party may
     incur, suffer or be required to pay resulting from or arising in connection
     with any product  liability or other  claims  (other than claims for patent
     infringement)  arising  from the use by any person of any  Product,  to the
     extent such product  liability or other claim  results from the  negligent,
     reckless  or   intentional   misconduct  of  Agouron,   its  Affiliates  or
     sublicensees,  or their respective  employees and agents,  or on account of
     Agouron's  failure to fulfill its  obligations or  undertakings  under this
     Agreement; provided, however, that in no event shall Agouron be liable to a
     JE Indemnified Party for any indirect, incidental, special or consequential
     damages, including loss of revenues or profits from sales of Products.

          (b) JE shall  indemnify and hold harmless  Agouron and its Affiliates,
     employees, and agents (an "Agouron Indemnified Party") from and against any
     and  all  liabilities,  losses,  damages,  costs,  or  expenses  (including
     reasonable  investigative and attorneys' fees) that the Agouron Indemnified
     Party may incur, suffer or be required to pay, resulting from or arising in
     connection  with any product  liability or other claims  (other than claims
     for patent infringement) arising from the use by any person of any Product,
     to the extent  such  product  liability  or other  claim  results  from the
     negligent,  reckless or  intentional  misconduct  of JE, its  Affiliates or
     sublicensees,  or their respective  employees and agents,  or on account of
     JE's  failure  to  fulfill  its  obligations  or  undertakings  under  this
     Agreement;  provided,  however,  that in no event  shall JE be liable to an
     Agouron  Indemnified  Party  for  any  indirect,   incidental,  special  or
     consequential damages,  including loss of revenues or profits from sales of
     Products.

          (c) To the extent that a product  liability or other claim (other than
     a claim for patent  infringement)  results from the negligent,  reckless or
     intentional   misconduct  of  more  than  one  Party,   their   Affiliates,
     sublicensees,  or their respective  employees and agents, the Parties agree
     to share in an equitable manner such liabilities,  losses,  damages, costs,
     or expenses in  proportion  to the  relative  fault of each of the Parties,
     their Affiliates, sublicensees, or their respective employees and agents.

          (d) Unless the Parties agree otherwise, all other liabilities, losses,
     damages,  costs,  or  expenses  (including  reasonable   investigative  and
     attorneys' fees) under this Section 7.02 relating to or involving a Product
     in a country, except as provided by the terms of Sections 7.02(a),  (b) and
     (c),  shall be the  responsibility  of the Party  marketing such Product in
     such country.  The Party  marketing a Product in a country shall  indemnify
     the  non-marketing  Party  in such  country  from and  against  any and all
     liabilities,  losses,  damages,  costs, or expenses  (including  reasonable
     investigative  and  attorneys'  fees)  which such  non-marketing  Party may
     incur, suffer or be required to pay resulting from or arising in connection
     with any product  liability or other  claims  (other than claims for patent
     infringement)  arising  from the use by any person of such  Product in

                                       38
<PAGE>

     such country. Section 3.02 sets forth the Parties' liability obligations 
     arising from claims for patent infringement.


          (e) The  aforesaid  obligations  of the  indemnifying  Party  shall be
     subject to the indemnified Party fulfilling the following obligations:

          (i) The indemnified  Party shall fully cooperate with the indemnifying
     Party in the defense of any claims,  actions,  etc., which defense shall be
     controlled by the indemnifying Party.

          (ii)  The  indemnified  Party  shall  not,  except  at its  own  cost,
     voluntarily make any payment or incur any expense with respect to any claim
     or suit without the prior written consent of the indemnifying  Party, which
     consent such Party shall not be required to give.

          (iii) The  indemnified  Party  shall  notify  the  indemnifying  Party
     promptly after receipt of a notice of the commencement of any litigation or
     threat thereof that may reasonably lead to a claim for indemnification.

          (f) The  Parties  agree to  maintain  appropriate  amounts  of product
     liability  insurance  coverage  and to have the other Party  included as an
     additional insured on such policies.

          Section 7.03 Dispute  Resolution.  In the event of any  controversy or
     claim arising out of or relating to any provision of this  Agreement or any
     term or condition  hereof, or the performance by a Party of its obligations
     hereunder,  the  Parties  shall try to settle  their  differences  amicably
     between  themselves.  If the  representatives  of the Parties are unable to
     reach  agreement  on any such  issue,  the  issue  shall be  submitted  for
     consideration, in the case of Agouron, to a designee of its Chief Executive
     Officer and, in the case of JE, to a designee of its  Managing  Director of
     Pharmaceuticals and Biobusiness  Division.  If such designees are unable to
     agree,  then the issue shall be  resolved,  in the case of Agouron,  by its
     Chief Executive Officer and, in the case of JE, by its Managing Director of
     Pharmaceuticals  and Biobusiness  Division.  Any unresolved  issues arising
     between the Parties  relating to,  arising out of, or in any way  connected
     with this Agreement or any term or condition  hereof, or the performance by
     a Party of its obligations  hereunder,  whether before or after termination
     of this Agreement, except as otherwise provided in this Agreement, shall be
     finally resolved by binding  arbitration.  Whenever a Party shall decide to
     institute  arbitration  proceedings,  it shall give written  notice to that
     effect to the other Party.  The Party giving such notice shall refrain from
     instituting  the  arbitration  proceedings  for a period of sixty (60) days
     following such notice.  If JE is the Party initiating the arbitration,  the
     arbitration shall be held in San Diego, California,  according to the rules
     of the American  Arbitration  Association  ("AAA"). If Agouron is the Party
     initiating the arbitration,  the arbitration shall be held in Tokyo, Japan,
     according  to the rules of the  Japan  Commercial  Arbitration  Association
     "JCAA").  The  arbitration  shall  be  conducted  by a  single  arbitrator
     mutually  chosen by the Parties.  If the Parties cannot agree upon a single
     arbitrator   within  fifteen  (15)  days  after  the   institution  of  the
     arbitration proceeding,  then the arbitration shall be conducted by a panel
     of three  arbitrators  appointed in accordance  with applicable AAA or JCAA
    

                                       39
<PAGE>

     rules;  provided,  however,  that each Party shall, within thirty (30) days
     after  the  institution  of  the  arbitration   proceedings,   appoint  one
     arbitrator  with  the  third  arbitrator  being  chosen  by the  other  two
     arbitrators. If only one Party appoints an arbitrator, then such arbitrator
     shall be entitled to act as the sole arbitrator to resolve the controversy.
     Any arbitration  hereunder shall be conducted in the English  language,  to
     the maximum  extent  possible.  All  arbitrator(s)  eligible to conduct the
     arbitration must agree to render their opinion(s)  within  thirty (30) days
     of  the  final  arbitration  hearing.  The  arbitrator(s)  shall  have  the
     authority  to grant  injunctive  relief  and  specific  performance  and to
     allocate  between the Parties the costs of  arbitration  in such  equitable
     manner as he/she determines;  provided, however, that each Party shall bear
     its own costs and attorneys' and witness' fees.  Notwithstanding  the terms
     of this Section 7.03, a Party shall also have the right to obtain, prior to
     the arbitrator(s) rendering the arbitration decision, provisional remedies,
     including  injunctive relief or specific  performance,  from a court having
     jurisdiction  thereof.  The arbitrator(s) shall, upon the request of either
     Party,  issue a written  opinion of the findings of fact and conclusions of
     law and  shall  deliver  a copy to each of the  Parties.  Decisions  of the
     arbitrator(s) shall be final and binding on all of the Parties. Judgment on
     the award so  rendered  may be  entered  in any court  having  jurisdiction
     thereof.

                        ARTICLE VIII - DISCLOSURE OF AGREEMENT

               Section 8.01  Disclosure of Agreement  Except as agreed to by the
          Parties,  and as  required  for  the  performance  of its  obligations
          hereunder, neither JE nor Agouron shall release any information to any
          third party with respect to any of the terms of this Agreement without
          the prior written consent of the other Party,  which consent shall not
          unreasonably  be  withheld.  This  prohibition  includes,  but  is not
          limited to, press releases,  educational  and scientific  conferences,
          promotional  materials  and  discussions  with the media.  The Parties
          shall jointly prepare and release a public announcement  regarding the
          existence of this Agreement. If a Party determines that it is required
          by law,  including  securities  laws  and  regulations  pertaining  to
          publicly traded companies,  to release  information to any third party
          regarding the terms of this Agreement, it shall notify the other Party
          of this fact prior to  releasing  the  information.  The notice to the
          other Party shall  include the text of the  information  proposed  for
          release.  The other  Party  shall  have the  right to confer  with the
          notifying  Party  regarding the necessity for the  disclosure  and the
          text of the information  proposed for release, but the notifying Party
          shall have the  discretion  to  release  the  information  as it deems
          necessary to fulfill its requirements under law.  Notwithstanding  the
          preceding,  JE and Agouron  shall each have the right to disclose  the
          terms of this  Agreement to persons it proposes to enter into business
          relationships with, if such persons are subject to confidentiality and
          use obligations equivalent to those applicable to the disclosing Party
          hereunder.

                       ARTICLE IX - GENERAL PROVISIONS

               Section  9.01 No  Implied  Licenses  Only  the  licenses  granted
          pursuant to the express terms of this Agreement  shall be of any legal
          force and effect. No license rights shall be created by implication or
          estoppel.

                                       40
<PAGE>

               Section  9.02 No Waiver Any  failure  by a Party to  enforce  any
          right which it may have  hereunder in any instance shall not be deemed
          to waive any right  which it or the other  Party may have in any other
          instance  with respect to any provision of this  Agreement,  including
          the provision which such Party has failed to enforce.

               Section 9.03 Severability; Government Acts. In the event that any
          provision  of  this  Agreement  is  judicially,   or  by  a  competent
          authority,  determined to be unenforceable,  in part or in whole, with
          regard to any or all of the countries in the Territory,  the remaining
          provisions or portions of this Agreement shall be valid and binding to
          the  fullest  extent  possible,  and the  Parties  shall  endeavor  to
          negotiate  additional terms, as feasible,  in a timely manner so as to
          fully  effectuate  the original  intent of the Parties,  to the extent
          possible,  in the  applicable  countries.  In the event  that any act,
          regulation, directive, or law of a country, including its departments,
          agencies  or courts  should make  impossible  or  prohibit,  restrain,
          modify or limit any material act or  obligation  of a Party under this
          Agreement,  and if any Party to this Agreement is materially adversely
          affected thereby, the Parties shall attempt in good faith to negotiate
          a  lawful  and   enforceable   modification  to  this  Agreement  that
          substantially  eliminates the material adverse effect;  provided that,
          failing any  agreement  in that  regard,  the Party who is  materially
          adversely  affected shall have the right, at its option, to suspend or
          terminate this Agreement as to such country.

               Section 9.04 Ambiguities.  Ambiguities, if any, in this Agreement
          shall not be construed against any Party,  irrespective of which Party
          may be deemed to have authored the ambiguous provision.

               Section  9.05  Notification  and  Governmental  Approvals.  After
          execution of this Agreement,  to the extent required by law,  Agouron,
          after  consultation with JE, shall notify the appropriate  authorities
          in the Licensed Territory about the terms of this Agreement; JE, after
          consultation with Agouron, shall notify the appropriate authorities in
          the JE  Territory  about the terms of this  Agreement.  JE and Agouron
          shall  obtain  any  government  approval(s)  required  to enable  this
          Agreement to become  effective,  or to enable any payment hereunder to
          be  made,  or  any  other  obligation  hereunder  to  be  observed  or
          performed.  Third-party  costs  and  expenses  incurred  in  notifying
          governmental  authorities or obtaining  governmental approval shall be
          shared  equally  between the Parties.  Each Party shall keep the other
          Party  informed  of  its  progress  in  notifying  such   governmental
          authorities  and  obtaining  such  government   approval,   and  shall
          cooperate with the other Party in any such efforts.

               Section 9.06 U.S.  Export  Controls  The Parties  agree to comply
          with the United  States  laws and  regulations  governing  exports and
          re-exports  of  the   Compound,   intermediates   thereof,   Products,
          Development Program Technology,  JE Technology or any other technology
          or software developed or disclosed as a result of this Agreement.  The
          Parties  acknowledge  that any  performance  under this  Agreement  is
          subject to any restrictions  which may be imposed by the United States
          laws and  regulations  governing  exports and  re-exports.  Each Party
          agrees to  provide  the other  Party with any  reasonable  assistance,
          including  written  assurances  which may be  required  by a competent
          governmental  authority and by applicable  laws and  regulations  as a
          precondition for any disclosure of technology or software by the other
          Party  under  the terms of 


                                       41
<PAGE>

          this  Agreement.  The  obligations  of this Section  9.06  shall 
          survive   termination   or  expiration  of  this Agreement.

               Section 9.07 No Agency.  JE and Agouron  shall have the status of
          independent  contractors under this Agreement and, except as otherwise
          explicitly provided in this Agreement, nothing in this Agreement shall
          be construed as an  authorization of a Party to act as an agent of the
          other Party.

               Section 9.08 Captions; Number; Official Language. The captions of
          the  articles  and  sections  of  this   Agreement   are  for  general
          information  and  reference  only,  and this  Agreement  shall  not be
          construed by  reference to such  captions.  Where  applicable  in this
          Agreement,  the singular  includes  the plural and vice versa.  To the
          extent  appropriate,  the  meaning of terms  whose  first  letters are
          capitalized,  but  which  are  variations  of terms  that are  defined
          elsewhere in this  Agreement,  shall each have the same meaning as the
          defined term. English shall be the official language of this Agreement
          and  any  license   agreement   provided   for   hereunder,   and  all
          communications  between the Parties  hereto shall be conducted in that
          language.

               Section 9.09 Force  Majeure.  A Party shall not be responsible to
          the  other  Party  for  any  failure,  delay  or  interruption  in the
          performance  of any of its  obligations  under this  Agreement if such
          failure,   delay  or  interruption  is  caused  by  any  act  of  God,
          earthquake,  fire, casualty, flood, war, epidemic, riot, insurrection,
          or any act,  exercise,  assertion  or  requirement  of a  governmental
          authority,  or other cause beyond the reasonable  control of the Party
          affected  if the Party  affected  shall have used its best  efforts to
          avoid such occurrence. If a Party believes that the performance of any
          of  its   obligations   under  this  Agreement  shall  be  delayed  or
          interrupted  as a result of any of the reasons  stated in this Section
          9.09,  and  provided  such Party is able to do so,  such  Party  shall
          promptly notify the other Party of such delay or interruption  and the
          cause  therefor,  and shall provide such other Party with its estimate
          of when the performance of its obligations shall recommence.  When the
          Party  affected is able to recommence  the  performance of obligations
          delayed or  interrupted  as a result of any of the  reasons  stated in
          this Section 9.09,  it shall so notify the other Party and,  except as
          otherwise  provided in this  Agreement,  it shall promptly  resume the
          performance of such obligations.

               Section   9.10   Amendment.   This   Agreement,   including   the
          Attachments, Exhibits and Schedules, constitutes the full agreement of
          the Parties with respect to the subject matter of this Agreement,  and
          incorporates any prior  discussions  between them with respect to such
          subject matter.  This Agreement  supersedes the rights and obligations
          of JE and Agouron under the Confidential  Disclosure Agreement and the
          Material  Transfer  Agreement  between  the  Parties  which  were both
          originally   entered  into  on  December  22,  1997.  This  Agreement,
          including the attachments hereto,  shall not be amended,  supplemented
          or otherwise  modified,  except by an instrument in writing  signed by
          duly authorized officers of the Parties.

               Section 9.11  Applicable  Law. This Agreement  shall be construed
          and the rights of the Parties shall be  determined in accordance  with
          the laws of  Japan;  provided,  however,  that  with  regard to issues
          concerning the validity and  construction  of patents,  trademarks and
          other  


                                       42
<PAGE>

          intellectual  property,  the  rights  of the  Parties  shall be
          determined in accordance with the laws of the country under which such
          intellectual   property   rights   were   granted.under   which   such
          intellectual property rights were granted.

               Section  9.12  Notices.  Any notice  required or  permitted to be
          given under this  Agreement  shall be in writing and shall be given in
          person,  delivered by recognized  overnight delivery service,  sent by
          mail  (certified or registered,  or air mail for addresses  outside of
          the  continental  U.S.),  or by  telefax  (or other  similar  means of
          electronic  communication),  whose  receipt is confirmed by confirming
          telefax, and addressed, in the case of JE, to its Managing Director of
          Pharmaceuticals and Biobusiness  Division and, in the case of Agouron,
          to the Senior  Vice President,  Commercial Affairs (with a copy to the
          Legal  Department),  at the  addresses  shown at the beginning of this
          Agreement,  or such  other  person  and/or  address  as may have  been
          furnished in writing to the  notifying  Party in  accordance  with the
          provisions of this Section 9.12. Except as otherwise  provided herein,
          any notice shall be deemed delivered upon the earliest of:  (i) actual
          receipt; (ii) four (4) business days after delivery to such recognized
          overnight  delivery  service;  (iii)  eight (8)  business  days  after
          deposit in the mail;  or  (iv) the  date of receipt of the  confirming
          telefax.

               Section 9.13 Assignment.  This Agreement shall be assignable by a
          Party to its  Affiliates;  if this Agreement is assigned by a Party to
          an  Affiliate,  the Party  shall still be  responsible  for all of its
          obligations as specified in this Agreement.  This Agreement shall only
          be  assignable  by a Party to a  non-Affiliated  third  party with the
          prior  written  consent  of the  other  Party,  which  consent  may be
          withheld  at the  sole  discretion  of  such  other  Party.  Any  such
          assignment  without the prior written consent of the other Party shall
          be void. Notwithstanding the preceding, in the event of: (i) a sale or
          transfer of all or substantially  all of a Party's assets; or (ii) the
          merger  or  consolidation  of  a  Party  with  another  company,  this
          Agreement shall be assignable to the transferee or successor company.

               Section 9.14 Succession. This Agreement shall be binding upon all
          successors   in   interest,   assigns,   trustees   and  other   legal
          representatives of the Parties.

                                       43
<PAGE>

               IN  WITNESS  WHEREOF,  the  Parties  hereto  have  executed  this
          Agreement at a formal signing  ceremony on July 28, 1998, in duplicate
          originals, by their respective officers thereunto duly authorized.

JAPAN ENERGY CORPORATION             AGOURON PHARMACEUTICALS, INC.


By:      /s/  Akihiko Nimoyama       By:      /s/ Peter Johnson
Name:    Akihiko Nimoyama            Name:    Peter Johnson
Title:   Representative Director and Title:   Chief Executive Officer
         President                            and President

By:      /s/ Ken Irino               By:      /s/ Gary Friedman
Name:    Ken Irino                   Name:    Gary E. Friedman, Esq.
Title:   Senior Management Director  Title:   Corporate V.P. and General Counsel




WITNESSED BY:

By:      /s/ Toshinobu Miyake                  By:      /s/ R. Kent Snyder
Name:    Toshinobu Miyake                      Name:    R. Kent Snyder
Title:   Assoc. Dir., General Mgr. of          Title:   Senior Vice President
         Coordination                                   Business Development
         Pharmaceuticals & Biobusines
         Division
                                   

                                       44
<PAGE>

                                      S1-1
                                   SCHEDULE 1

                       JE PATENTS AND PATENT APPLICATIONS


                                       *

                                      S1-1
<PAGE>




















                                      S2-1
                                   SCHEDULE 2

                                        *

                                      S2-1
<PAGE>

                                        *


                                   
                                SCHEDULE 7.01(c)

                                        *
                                  

                                   S7.01(c)-1
<PAGE>
                                        *

                                    EXHIBIT 1

                               DEVELOPMENT PROGRAM


                                *


                                      E1-1
<PAGE>
                                 
                                  ATTACHMENT 1

                                TRADEMARK LICENSE


                                        *

                                      A1-1
<PAGE>

   PORTIONS OF THIS DOCUMENT HAVE BEEN OMITTED (DESIGNATED BY AN ASTERISK (*)
AND WHITE SPACE) AND FILED SEPARATELY WITH THE SECURITIES AND ECHANGE COMMISSION
     PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT DATED AUGUST 4, 1998;
                                FILE NO. 0-15609

                         COMMON STOCK PURCHASE AGREEMENT


       This Common Stock Purchase  Agreement  ("Agreement")  is made and entered
into as of June 11,  1998 by and  between THE IMMUNE  RESPONSE  CORPORATION.,  a
Delaware  corporation  (hereinafter  referred  to as the  Company)  and  AGOURON
PHARMACEUTICALS,  INC.,  a California  corporation  ("Agouron"),  which  parties
hereby agree as follows:

1.     Authorization; Commitment; Closing

       1.01 Authorization.  The Company proposes to authorize, issue and sell to
Agouron on or before  January 15,  2000,  certain  amounts of its common  stock,
$.0025 par value ("Common Stock"), as described and determined below.

       1.02  Commitment.  Subject to Paragraph 5.06 and the terms and conditions
hereof and on the basis of the  representations  and warranties  hereinafter set
forth,  the Company  agrees to issue and sell to Agouron,  and Agouron  agree to
purchase  from the Company as of the dates and for the  consideration  set forth
below, the number of shares of the Company's  Common Stock as determined  below.
The Common  Stock  which  Agouron  is  acquiring  pursuant  to the terms of this
Agreement is hereinafter  referred to as "Restricted  Common Stock".  Agouron is
hereinafter  sometimes  referred to as the  "Purchaser."  The  purchases  of the
Common Stock shall occur on the seven  purchase  dates set forth below.  On each
purchase  date,  Agouron  shall be entitled to acquire  such number of shares of
Restricted  Common  Stock  (rounded  up to the  nearest  whole  share) as may be
purchased for  $2,000,000,  at a purchase  price equal to the stated premium set
forth  opposite the applicable  purchase  date,  over the then fair market value
("FMV") of the Common Stock on The NASDAQ Stock Market.  FMV shall be defined as
the average closing price of the Common Stock on The NASDAQ Stock Market for the
five (5) trading days immediately preceding the referenced purchase date. In the
event  the  FMV is  *                      on any  purchase  date,  the  premium
applicable to such purchase date shall be adjusted to *  

<TABLE>
<CAPTION>
                 
                  Purchase Date                      Purchase Price                    *
                  -------------                      --------------
                  <S>                                 <C>                                <C>

                  June 11, 1998                      $2,000,000                           *
                  October 15, 1998                   $2,000,000                           *
                  January 15, 1999                   $2,000,000                           *
                  April 15, 1999                     $2,000,000                           *
                  July 15, 1999                      $2,000,000                           *
                  October 15, 1999                   $2,000,000                           *
                  January 15, 2000                   $2,000,000                           *

</TABLE>

       1.03  Closing.  Separate  closings  of  the  purchase  and  sale  of  the
Restricted Common Stock  ("Closings")  shall occur on each of the purchase dates
set forth  above and shall take place at such time and place as the  Company and
Purchaser  shall agree.  At each Closing the Company  shall deliver to Purchaser
the number of shares of  Restricted  Common Stock  required by  Paragraph  1.02,
above,  upon  delivery to the Company by Purchaser of a certified  check or wire
transfer of funds in the amount of $2,000,000. The Restricted Common Stock to be
delivered  to Agouron  hereunder  at each  Closing will be evidenced by a single
certificate


<PAGE>


registered  in  Agouron's  name or in the name of such  nominee as  Agouron  may
specify and, when issued in accordance  with the terms of this Agreement for the
consideration  expressed herein, will be duly authorized,  validly issued, fully
paid,  nonassessable  and free and clear of any liens or encumbrances  caused or
created by the Company (except that such Restricted  Common Stock of the Company
will be subject to restrictions  on transfer under federal and applicable  state
securities laws).

2.     Representations

       2.01  Representations of the Company. The Company represents and warrants
as follows:

                  (a) The  Company  is a  corporation  duly  organized,  validly
                  existing and in good  standing  under the laws of the State of
                  Delaware and has all requisite  power and authority  which are
                  necessary to own and operate its business and  properties  and
                  to carry on its business as it is being conducted. The Company
                  is duly  licensed and  qualified  and in good  standing in the
                  State of California and in such other  jurisdictions  in which
                  the  ownership  or lease of  property  or the  conduct  of its
                  business makes such licensing or qualification necessary.

                  (b) There are no  proceedings  pending or, to the knowledge of
                  the Company,  threatened  against or affecting  the Company in
                  any court or before any  governmental  authority  or agency or
                  arbitration board or tribunal which involve the possibility of
                  materially and adversely  affecting the properties,  business,
                  prospects  or  condition   (financial  or  otherwise)  of  the
                  Company.

                  (c) The issuance and sale of the  Restricted  Common Stock and
                  compliance  by the Company with all of the  provisions of this
                  Agreement are within the  corporate  powers of the Company and
                  have been duly  authorized by all proper  corporate  action on
                  the part of the  Company  and will  not (i)  conflict  with or
                  result  in any  breach  of any of  the  terms,  conditions  or
                  provisions  of, or  constitute a default under the Articles of
                  Incorporation  of the  Company or the  Bylaws of the  Company,
                  (ii)  conflict  with or  result  in any  breach  of any of the
                  terms,  conditions or  provisions  of, or constitute a default
                  under or give any party the right to terminate  or  accelerate
                  performance  under any other  agreement or instrument to which
                  the Company is a party (iii)  require  consent under any other
                  contract to which the  Company is a party,  (iv) result in the
                  creation or imposition of any lien, charge or encumbrance upon
                  any property or assets of the Company pursuant to the terms of
                  any  other  contract  to which the  Company  is a party or (v)
                  conflict  with  any  provision  of  any  applicable  judgment,
                  decree,  order,  statute,  rule, or regulation of any court or
                  any public,  governmental or regulatory  agency or body having
                  jurisdiction over the Company.

                  (d) This  Agreement  is a valid and binding  agreement  of the
                  Company and is  enforceable  against the Company in accordance
                  with the terms hereof,  except as such  enforceability  may be
                  affected by applicable bankruptcy laws and equitable remedies.


                                       2
<PAGE>

                  (e) The  authorized  capital stock of the Company  consists of
                  5,000,000  shares of  preferred  stock  (preferred  stock) and
                  40,000,000 shares of common stock. As of the date hereof,  200
                  shares  of  its  Series  F  Convertible  Preferred  Stock  are
                  outstanding.  This preferred stock is convertible  into common
                  stock initially at a conversion price equivalent to $14.07 per
                  share of common stock. If the Company's  common stock does not
                  trade at prices  higher than $14.07 per share over a period of
                  time, the conversion price will be adjusted  downward on April
                  24, 1999 (or sooner if the Company issues common stock at less
                  than $14.07 per share) and quarterly thereafter. As of June 9,
                  1998,   22,900,350   shares   of  voting   common   stock  are
                  outstanding.  As of the date hereof,  4,497,749  stock options
                  issued  pursuant to the  Company's  stock option plans and two
                  (2) warrants to purchase a total of 2,051,281 shares of voting
                  stock are outstanding.  Up to 6,180,000 shares of common stock
                  may be issued under the Company's  stock option plans.  Except
                  as set  forth  above,  there are no other  options,  warrants,
                  conversion  privileges,  preemptive rights, or rights of first
                  refusal  granted by the  Company in favor of any other  person
                  presently  outstanding  or in existence to purchase or acquire
                  any  of  the  authorized  but  unissued  Common  Stock  of the
                  Company, other than any of such items granted pursuant to this
                  Agreement. The Company has provided to Purchaser copies of its
                  currently in effect Articles of Incorporation and Bylaws,  its
                  Form  10-K for the year  ended  December  31,  1997,  its 1997
                  Annual Report,  its Proxy  statement  dated April 27, 1998 and
                  its Form  10-Q for the  quarter  ended  March  31,  1998.  The
                  Company  warrants  that  the  information  contained  in  such
                  documents as updated and supplemented prior to the date of the
                  Closing is true and correct and when taken as a whole does not
                  omit  a fact  necessary  to  make  the  information  contained
                  therein in light of the circumstance under which the documents
                  were made (taking into account,  without limitation,  the type
                  of  transaction   contemplated   by  this  Agreement  and  the
                  sophistication  and nature of the Purchaser),  not misleading.
                  The Company  acknowledges that the Purchaser is relying on the
                  written documentation  provided by the Company to Purchaser as
                  described  above  in  making  its  decision  to  purchase  the
                  Restricted Common Stock.

                  (f) Since March 31, 1998, except for the sale of 200 shares of
                  Series F Convertible  Preferred  Stock for $10 million,  there
                  has not been any change in the assets, liabilities,  financial
                  condition or  operations  of the Company other than changes in
                  the ordinary course of business, none of which individually or
                  in the aggregate  have had a material  adverse  affect on such
                  assets, liabilities,  financial condition or operations of the
                  Company.

       2.02  Representations  of the  Purchaser.  The Purchaser  represents  and
warrants as follows:

                  (a) It is the intent of the Purchaser that its purchase of the
                  Restricted  Common Stock  contemplated by this Agreement shall
                  constitute a transaction  exempt from  registration  under the
                  Securities Act of 1933, as amended (the "Securities  Act") and
                  any applicable state securities laws.

                                       3
<PAGE>

                  (b)  Purchaser  will not offer or sell any  Restricted  Common
                  Stock except pursuant to an effective  registration  statement
                  under  the  Securities  Act or in  transactions  which  do not
                  require registration under the Securities Act.

                  (c)  Purchaser is a  corporation  duly  organized  and validly
                  existing  under the laws of the State of California is in good
                  standing  under  such  laws  and has all  requisite  corporate
                  powers and authority to enter into this Agreement.

                  (d) On or prior to the date of the initial Closing,  Purchaser
                  will have taken all action  necessary  for the  authorization,
                  execution, delivery and performance of this Agreement.

                  (e) Purchaser has (i) reviewed this Agreement, and the written
                  statements, and documents, delivered to Purchaser as described
                  in Section 2.01(e);  and, (ii) received  satisfactory response
                  from the  Company  as to matters  about  which  Purchaser  has
                  inquired  relating  to this  Agreement,  and  other  documents
                  described  in Section  2.01(e) and  relating to the  Company's
                  business  condition,  prospects  and  plans  as  necessary  to
                  evaluate  the merits  and risks of  acquiring  the  Restricted
                  Common   Stock.   Purchaser  has  informed  the  Company  that
                  Purchaser is relying on all such  information and documents in
                  making its decision to purchase the Restricted Common Stock.

                  (f) Purchaser (i) has had the risks involved in the investment
                  represented  by this Agreement  explained;  (ii) has knowledge
                  and  experience in financial and business  matters to evaluate
                  the merits  and risks of the  investment  represented  by this
                  Agreement;  (iii)  is able to bear  the  economic  risk of the
                  investment represented by this Agreement (including a complete
                  loss of this  investment);  and (iv) has determined  that this
                  investment is suitable for  Purchaser in light of  Purchaser's
                  financial     circumstances    and    available     investment
                  opportunities.

                  (g) Purchaser is acquiring the Restricted Common Stock for its
                  own  account  and with its  general  assets for the purpose of
                  investment  and not  with a view to the  resale,  transfer  or
                  distribution thereof, and has no present intention of selling,
                  transferring,   negotiating  or  otherwise  disposing  of  any
                  Restricted  Common  Stock.  Notwithstanding  anything  in this
                  Agreement  to the  contrary,  it is agreed that the  Purchaser
                  shall  have the  right to assign or  transfer  the  Restricted
                  Common Stock to its Affiliates at any time without the consent
                  of the Company.

3.  Non-Disclosure.  Except as agreed to by the parties  neither the Company nor
the Purchaser  shall release any  information to any third party with respect to
any of the terms of this  Agreement  without  the prior  written  consent of the
other,  which  consent  shall not  unreasonably  be withheld.  This  prohibition
includes,  but is not limited to,  press  releases,  promotional  materials  and
discussions with the media. If the Company determines that it is required by law
to release information to any third party regarding the terms of this Agreement,
it shall notify the Purchaser of this fact prior to releasing  the  information.
The notice to the Purchaser shall include the text of the  information  proposed
for  release.  The  Purchaser  shall

                                       4
<PAGE>


have the  right to confer  with the  Company  regarding  the  necessity  for the
disclosure and the text of the information proposed for release.

4.     Compliance with Securities Act

       4.01 Certain Definitions.  As used herein, the following terms shall have
the following respective meanings:

                  (a)  Commission.   Shall  mean  the  Securities  and  Exchange
                  Commission,   or  any  other   Federal   agency  at  the  time
                  administering  the Securities Act or the Trust  Indenture Act,
                  as the case may be.

                  (b) Securities  Act. Shall mean the Securities Act of 1933, as
                  amended,  or any similar  Federal  statute,  and the rules and
                  regulations  of the  Commission  thereunder,  all as the  same
                  shall be in effect at the relevant time.

                  (c) Exchange Act.  Shall mean the  Securities  Exchange Act of
                  1934,  as amended,  or any similar  Federal  statute,  and the
                  rules and regulations of the Commission thereunder, all as the
                  same shall be in effect at the relevant time.

                  (d)  Restricted  Common Stock.  Shall mean the Common Stock of
                  the Company issued and sold pursuant to this  Agreement  which
                  by the terms  hereof is required to bear the legend  specified
                  in Section 4.02 hereof.

       4.02 Restriction of Transferability;  Legend. Shares of Restricted Common
Stock shall not be resold or transferred  unless registered under the Securities
Act or unless an  exemption  from  registration  is  available  for such sale or
transfer.  The conditions specified below are intended to ensure compliance with
the provisions of the  Securities Act in respect of any transfer of stock.  Each
certificate for shares of Restricted  Common Stock shall be stamped or otherwise
imprinted with a legend in substantially the following form:

                           The shares  evidenced  by this  certificate  have not
                           been registered  under the Securities Act of 1933, as
                           amended,  and may not be sold or  transferred  in the
                           absence  of  such   registration   or  an   exemption
                           therefrom  under said Securities Act and the transfer
                           of such  shares is  subject  to terms and  conditions
                           specified  in the  Common  Stock  Purchase  Agreement
                           dated as of June 11,  1998,  between  the Company and
                           Agouron Pharmaceuticals, Inc.

If shares of Restricted Common Stock evidenced by certificates  bearing a legend
required  by this  Section  4.02  are  sold in  accordance  with a  registration
statement which has become effective under the Securities Act, or if the Company
shall  receive an opinion of its counsel to the effect that any legend  required
under this  Section  4.02 is not, or is no longer,  necessary  or required  with
respect  to  such  shares  (including,   without  limitation,   because  of  the
availability  of the  exemption  afforded by Rule 144 of the  General  Rules and
Regulations  of the  Commission),  the  Company  shall,  or shall  instruct  its
transfer  agent and registrar  to, remove such legend or issue new  certificates
without such legend in lieu thereof.


                                       5
<PAGE>

       4.03   Information Requirements.  The Company agrees to:

                  (a) Make and keep public information  available,  as such term
                  is  understood  and  defined in  Commission  Rule 144 and Rule
                  144A, under the Securities Act;

                  (b) Use its best  efforts  to file  with the  Commission  in a
                  timely manner all reports and other documents  required of the
                  Company under the Securities Act and the Exchange Act; and

                  (c) Furnish to any holder of Restricted Common Stock a copy of
                  the most recent annual or quarterly report of the Company, and
                  such other  publicly  available  reports and  documents of the
                  Company,  so that such holder may avail  itself of any rule or
                  regulation  of the  Commission  allowing  it to sell  any such
                  securities without registration.

       4.04 Piggy-Back  Registration  Rights.  If the Company before January 15,
2001  contemplates  a  public  offering  of  shares  of its  Common  Stock to be
registered  under the Securities  Act, the Company shall so notify the Purchaser
in writing of its  intention  to do so, at least  twenty  (20) days prior to the
filing of a registration statement for such offering. If Purchaser gives written
notice to the  Company,  within ten (10) days of receipt of the notice  from the
Company,  of Purchaser's  desire to have its Restricted Common Stock included in
such  registration  statement,  Purchaser may, subject to the provisions of this
Section 4.04,  have its Restricted  Common Stock  included in such  registration
statement.   The  Company  shall  bear  all  expenses  in  connection  with  the
registration and sale of any such Restricted  Common Stock,  other than the fees
or  disbursements  of any  special  counsel  which the  Purchaser  may retain in
connection with the  registration of its Restricted  Common Stock or any portion
of the  underwriter's  commission,  discounts and expenses  attributable  to the
Restricted Common Stock being offered and sold by the Purchaser. Notwithstanding
the foregoing,  if the managing underwriter of any such offering determines that
the number of shares proposed to be sold by the Company,  by other  shareholders
having piggy-back rights,  and/or by the Purchaser is greater than the number of
shares which the underwriter believes feasible to sell at the time, at the price
and upon the terms approved by the Company,  then the number of shares which the
underwriter  believes  may be sold  shall  be  allocated  for  inclusion  in the
registration  statement in the  following  order of  priority:  (i) shares being
offered by the Company;  and (ii) pro rata among the other  shareholders and the
Purchaser,  based on the  number  of shares of  Common  Stock  each  shareholder
requested to be  registered.  The Company  shall have the right to designate the
managing   underwriter  in  respect  of  a  public  offering  pursuant  to  this
Section 4.04.

       4.05       Additional Covenants Concerning Sale of Shares.

                  (a) The Company will notify the Purchaser of the effectiveness
                  of any registration statement in which Purchaser has exercised
                  registration  rights granted  pursuant to the terms of Section
                  4.04,  together  with a list of the  jurisdictions  where  the
                  Company has  qualified  or is exempt from  registration  under
                  applicable state securities laws.

                                       6
<PAGE>

                  (b) The Company will prepare and file with the Commission such
                  amendments and supplements to any registration statement filed
                  pursuant to the terms of Section 4.04 (and any prospectus used
                  in  connection  with such  registration  statement)  as may be
                  necessary to comply with the  provisions of the Securities Act
                  with  respect to the sale of  Restricted  Common  Stock by the
                  Purchaser.

                  (c) The Company  will  furnish to the  Purchaser a  reasonable
                  number of copies of the prospectus  used in connection  with a
                  registration  statement filed pursuant to the terms of Section
                  4.04,  including a preliminary  prospectus,  which  prospectus
                  conforms to the  requirements  of the Securities Act, and such
                  other  documents as the Purchaser may reasonably  request,  in
                  order  to  facilitate  the   disposition  of  the  Purchaser's
                  Restricted Common Stock.

                  (d) In connection with any registration  statement referred to
                  in Section 4.04 of this  Agreement,  Purchaser will furnish to
                  the Company  such  information  as the Company may  reasonably
                  require  from  Purchaser  for  inclusion  in the  registration
                  statement (and the prospectus included therein).

                  (e) The  Company's  obligations  under  Section  4.04 shall be
                  conditioned  upon  Purchaser  executing and  delivering to the
                  Company its agreement,  in a form  satisfactory to counsel for
                  the  Company,   that  it  will  comply  with  all   applicable
                  provisions  of the  Securities  Act,  the  Exchange  Act,  the
                  securities  acts  of  applicable  states  and  any  rules  and
                  regulations  promulgated  under such acts and will  furnish to
                  the  Company  information  about  sales  made in  such  public
                  offering.

       4.06       Indemnification

         In the  event  any of the  Restricted  Common  Stock  of  Purchaser  is
included in a registration statement under Section 4.04 of this Agreement:

                  (a) To the extent permitted by law, the Company will indemnify
                  and hold harmless the Purchaser and its  Affiliates  and their
                  respective  officers,  directors  and  employees,  against any
                  losses, claims,  damages, or liabilities (joint or several) to
                  which they may become  subject under the  Securities  Act, the
                  Exchange  Act or other  federal or state law,  insofar as such
                  losses, claims, damages, or liabilities (or actions in respect
                  thereof)  arise out of or are based upon any of the  following
                  statements,  omissions or  violations  (hereinafter  sometimes
                  collectively referred to as a "Violation(s)"):  (i) any untrue
                  statement  or alleged  untrue  statement  of a  material  fact
                  contained  in  such  registration  statement,   including  any
                  preliminary  prospectus or final prospectus  contained therein
                  or any amendments or supplements thereto; (ii) the omission or
                  alleged  omission to state therein a material fact required to
                  be stated therein, or necessary to make the statements therein
                  not misleading; or (iii) any violation or alleged violation by
                  the Company of the Securities Act, the Exchange Act, any state
                  securities law or any rule or regulation promulgated under the
                  Securities Act, the Exchange Act or any state  securities law;
                  and the Company will

                                       7
<PAGE>

                 reimburse each such indemnified party for any legal or other
                 expenses   reasonably   incurred   by  it  in   connection  
                 with investigating  or  defending  any  such  loss,   claim,  
                 damage, liability  or  action;  provided,  however,  that  the
                 indemnity agreement  contained  in this  Section  4.06  shall 
                 not apply to amounts  paid in  settlement  of any such  loss, 
                 claim,  damage, liability or action if such  settlement  is
                 effected  without the consent of the Company (which  consent 
                 shall not be  unreasonably withheld or delayed), nor shall the
                 Company be liable in any such case for any such loss, claim, 
                 damage, liability or action to the extent that it arises out of
                 or is based upon a  Violation  which occurs  in  reliance upon,
                 and  in  conformity  with,   written information  furnished  
                 expressly for use in connection with such registration, by any 
                 such indemnified party.

                 (b) To  the  extent  permitted  by  law,  the  Purchaser  will
                 indemnify and hold harmless the Company and its Affiliates and
                 their respective officers, directors and employees against any
                 losses, claims,  damages, or liabilities (joint or several) to
                 which they may become  subject under the  Securities  Act, the
                 Exchange  Act or other  federal or state law,  insofar as such
                 losses, claims, damages, or liabilities (or actions in respect
                 thereof)  arise out of or are based  upon any  Violations,  in
                 each case to the  extent  (and only to the  extent)  that such
                 Violation  occurs in reliance  upon,  and in conformity  with,
                 written  information   furnished  by  the  Purchaser  and  its
                 Affiliates  and  their  respective  officers,   directors  and
                 employees to the Company  expressly for use in connection with
                 such registration;  and the Purchaser will reimburse each such
                 indemnified  party for any legal or other expenses  reasonably
                 incurred by it in connection with  investigating  or defending
                 any such loss, claim, damage,  liability or action;  provided,
                 however,  that  the  indemnity  agreement  contained  in  this
                 Section 4.06 shall not apply to amounts paid in  settlement of
                 any such  loss,  claim,  damage,  liability  or action if such
                 settlement is effected  without the consent of the  Purchaser,
                 which consent shall not be unreasonably withheld or delayed.

                  (c) Promptly after receipt by an indemnified  party under this
                  Section  4.06 of  notice  of the  commencement  of any  action
                  (including any governmental  action),  such indemnified  party
                  will, if a claim in respect  thereof is to be made against the
                  indemnifying   party  under  this  Section  4.06,  notify  the
                  indemnifying party in writing of the commencement  thereof and
                  the indemnifying party shall have the right to participate in,
                  and,  to the  extent the  indemnifying  party so  desires,  to
                  assume the defense thereof with counsel mutually  satisfactory
                  to the parties.

5.     Miscellaneous

       5.01 Expenses;  Finders Fees. Neither party shall pay expenses and finder
fees for or to the other in connection with this transaction.  Each party agrees
to  indemnify  and hold the other  party  harmless  from any  liability  for any
commission  or  compensation  in the nature of a  finder's  fee to any broker or
other person (and the costs and expenses of defending  against such liability or
asserted liability) claiming to have been hired or engaged by the party.

       5.02  Replacement  of  Certificates  for  Restricted  Common Stock.  Upon
receipt by the Company of evidence  reasonably  satisfactory  to it of the loss,
theft,  destruction or mutilation of

                                       8
<PAGE>

any  certificate  evidencing  any  Restricted  Common  Stock,  the Company  will
execute,  register and deliver,  in lieu thereof, a new certificate for an equal
number of shares  of  Restricted  Common  Stock.  In the case of loss,  theft or
destruction of a certificate,  at the election of the Company, the Purchaser may
be required to provide an indemnity reasonably satisfactory to the Company or to
post a surety bond in an amount equal to the value of the shares  represented by
the new certificate.

       5.03  Notice.  Any notice  required  to be given  under the terms of this
Agreement  shall be in  writing,  and shall be given in person,  transmitted  by
telecopier,   e-mail  or  similar  electronic  communication,   delivered  by  a
recognized  overnight  delivery  service such as Federal Express or sent by mail
(certified or  registered  or air mail for  addresses  outside of the country of
origin), return receipt requested,  postage prepaid and addressed to the Company
at 5935 Darwin Court,  Carlsbad,  California 92008, or such other address as the
Company may  designate  to  Purchaser  in writing and to the  Purchaser,  at the
address  appearing at the  beginning of this  Agreement or such other address as
Purchaser may designate to the Company in writing.  Except as otherwise provided
herein,  any notice so given shall be deemed  delivered  upon the earlier of (i)
actual receipt;  (ii) receipt by sender of confirmation if telecopied or sent by
e-mail or  similar  electronic  communication;  (iii) two  business  days  after
delivery to such overnight  delivery  service;  or (iv) five business days after
deposit in the mail.

       5.04  Successors and Assigns.  This  Agreement  shall be binding upon the
parties and their respective successors and assigns.

       5.05 Survival of Representations, Etc. All covenants, representations and
warranties  made by the  parties  herein  shall  survive  the  Closings  and the
delivery of this Agreement and the shares of Restricted  Common Stock  purchased
hereunder.

       5.06 Termination.  Purchaser's  obligation to purchase  Restricted Common
Stock  under  this  Agreement  shall  terminate  with  respect  to any  purchase
obligations  whose purchase dates under Paragraph 1.02 occur after Purchaser has
elected to terminate, in its entirety, all of Purchaser's rights and obligations
under the  Letter of  Intent  ("LOI")  dated  June 11,  1998 and the  Definitive
Agreement (as defined in the LOI) between the parties.

       5.07  Severability.  Should any part of this  Agreement for any reason be
declared  invalid,  such decision shall not affect the validity of any remaining
portion,  which  remaining  portion  shall remain in force and effect as if this
Agreement had been executed with the invalid portion  thereof  eliminated and it
is hereby  declared  the  intention  of the parties  hereto that they would have
executed the remaining  portion of this Agreement  without including therein any
such part,  parts, or portion which may, for any reason,  be hereafter  declared
invalid.

       5.08  Governing  Law. This  Agreement  shall be construed and enforced in
accordance  with,  and governed by, the laws of the State of California  without
regard to its conflict of law provisions.

       5.09 Captions,  Form of Pronouns. The descriptive headings of the various
sections  or parts of this  Agreement  are for  convenience  only and  shall not
affect the meaning or construction of any of the provisions hereof. All pronouns
used in this Agreement shall be deemed to include masculine, feminine and neuter
forms.

                                       9
<PAGE>

       5.10 Agreement is Entire Contract.  This Agreement constitutes the entire
contract  between  the  parties  hereto  related  to the  purchase  and  sale of
Restricted  Common  Stock and no party  shall be liable or bound to the other in
any  manner  by  any  warranties,   representations   or  covenants   except  as
specifically set forth herein.

       5.11 Third Parties.  Nothing in this Agreement is intended to confer upon
any  party,  other  than the  parties  hereto,  and their  respective  permitted
successors and assigns, any rights, remedies,  obligations, or liabilities under
or by reason of this Agreement, except as expressly provided herein.

       5.12 Amendment and Waiver. Any provision of this Agreement may be amended
and the  observance of any term hereof may be waived  (either  prospectively  or
retroactively  and either  generally or in a particular  instance) only with the
written consent of the Company and the Purchaser.

       5.13  Affiliates.  References  to  Purchaser in this  Agreement  shall be
deemed to  include  direct  or  indirect  subsidiaries  of  Purchaser.  The term
"Affiliate" shall have the meaning defined in the LOI.

       5.14 Dispute Resolution. In the event of any controversy or claim arising
out of or relating to any provision of this Agreement,  the parties shall try to
settle their differences  amicably between  themselves.  Any unresolved disputes
arising between the parties  relating to, arising out of or in any way connected
with this  Agreement  or any term or condition  hereof,  or the  performance  by
either party of its obligations  hereunder,  whether before or after termination
of this Agreement, shall be finally resolved by binding arbitration.  Whenever a
party shall decide to institute arbitration  proceedings,  it shall give written
notice to that effect to the other  party.  The party  giving such notice  shall
refrain from instituting the arbitration  proceedings for a period of sixty (60)
days  following  such  notice  The  arbitration  shall  be  held  in San  Diego,
California  according  to the  rules  of the  American  Arbitration  Association
("AAA")  applicable  to  commercial  securities  matters  of  this  nature.  The
arbitration  shall be  conducted  by a panel of three  arbitrators  appointed in
accordance  with AAA rules;  provided,  however,  that each party  shall  within
thirty (30) days after the  institution of the arbitration  proceedings  appoint
one  arbitrator  with  the  third  arbitrator  being  chosen  by the  other  two
arbitrators.  If only one party  appoints an  arbitrator,  then such  arbitrator
shall be entitled to act as the sole arbitrator to resolve the controversy.  Any
arbitration  hereunder  shall  be  conducted  in the  English  language  and the
arbitrator(s)  shall apply the law set forth in SectionE5.08.  All arbitrator(s)
eligible to conduct the arbitration must agree to render their opinion(s) within
thirty (30) days of the final arbitration  hearing. The arbitrator(s) shall have
the  authority  to grant  injunctive  relief and  specific  performance,  and to
allocate  between the parties the costs of arbitration in such equitable  manner
as he determines;  provided,  however,  that each party shall bear its own costs
and  attorney's  and witness'  fees.  Notwithstanding  the terms of this Section
5.14,  a party  shall also have the right to obtain  prior to the  arbitrator(s)
rendering the arbitration  decision,  provisional  remedies including injunctive
relief or specific  performance from a court having  jurisdiction  thereof.  The
arbitrator(s) will, upon the request of either party, issue a written opinion of
the findings of fact and  conclusions of law and shall deliver a copy to each of
the parties. Decisions of the arbitrator(s) shall be final and binding on all of
the  parties.  Judgment  on the award so  rendered  may be  entered in any court
having jurisdiction thereof.


                                       10
<PAGE>



       The execution  hereof by Purchaser shall constitute a contract between us
for the uses and  purposes  hereinabove  set forth,  and this  Agreement  may be
executed in any number of counterparts,  each executed counterpart  constituting
an original but all together only one agreement.

                                         THE IMMUNE RESPONSE CORPORATION


                                          By /s/ Dennis J. Carlo


                                          By /s/ Charles J. Cashion



ACCEPTED AND AGREED TO AS OF THE DAY AND YEAR AFORESAID.

                                   PURCHASER:

                                       AGOURON PHARMACEUTICALS, INC


                                       By /s/ Peter Johnson
                                          Peter Johnson
                                          President and Chief Executive Officer


                                       By /s/ Gary Friedman
                                          Gary Friedman
                                          Secretary


                                      11
<PAGE>

       
   PORTIONS OF THIS DOCUMENT HAVE BEEN OMITTED (DESIGNATED BY AN ASTERISK (*)
     AND WHITE SPACE) AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
          COMMISSION PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT
                     DATED AUGUST 4, 1998; FILE NO. 0-15609

AMENDMENT TO THE VIRACEPT (Nelfinavir Mesylate) LICENSE AGREEMENT


     This Amendment  ("Amendment") to the VIRACEPT (Nelfinavir Mesylate) License
Agreement  ("the  Agreement"),  effective  as of  this  1st  day  of  May,  1998
("Effective Date"), is between Agouron Pharmaceuticals, Inc., a corporation duly
organized  and  existing  under  the laws of the state of  California,  having a
principal  place of  business  at  10350  North  Torrey  Pines  Road,  La Jolla,
California,  United States of America  (hereinafter  referred to as  "Agouron"),
Japan Tobacco Inc., a corporation  duly organized and existing under the laws of
Japan,  having its principal  place of business at JT Building,  2-1,  Toranomon
2-chome,  Minato-ku,  Tokyo,  Japan  (hereinafter  referred  to  as  "JT"),  and
F. Hoffmann-La  Roche Ltd, a corporation  duly  organized and existing under the
laws of Switzerland,  having its principal  place of business at  CH-4002-Basel,
Switzerland (hereinafter referred to as "Roche"). Agouron, JT and Roche are each
sometimes  hereinafter  referred  to as a party  (collectively  "parties").  The
parties for good and valuable consideration hereby agree as follows:

                                 RECITALS

1.   Background

     1.01 All capitalized terms,  except as expressly  otherwise defined herein,
shall have the meanings set forth in the Agreement.

     1.02  Agouron,  JT and Roche entered into a Letter of Intent on January 17,
1997  and  the  VIRACEPT  (nelfinavir  mesylate)  License  Agreement  dated  for
reference purposes only June 30, 1997,  under which Agouron and JT granted,  and
Roche received, a license in the Licensed Territory to use, offer for sale, sell
and/or import Products in the Field under  applicable  Agouron/JT  Patent Rights
and  Development   Program  Patent  Rights  and  using   applicable   Agouron/JT
Technology, Roche Technology and Development Program Technology.

     1.03  Roche has  certain  capacities  to  manufacture  Compound  as well as
formulate  Product.  Roche  has  informed  Agouron  and  JT  of  its  desire  to
manufacture  Compound and formulate Product to be sold and/or distributed in the
Licensed    Territory   with   such   Roche    manufacturing   and   formulating
responsibilities to be phased-in over an agreed-to period of time.

     1.04 The parties,  in accordance  with the provisions of Section 4.04(f) of
the Agreement,  have  discussed in good faith an  arrangement  under which Roche
could be the  manufacturer  of Compound and the formulator of Product to be sold
and/or distributed in the Licensed Territory.

     1.05  Agouron and JT under  certain  conditions  are willing to grant Roche
certain rights to manufacture  Compound and formulate  Product to be sold and/or
distributed in the Licensed Territory.

     1.06     *



<PAGE>


     1.07      *







     1.08  To  effect  the  preceding  and  clarify  the  parties'   rights  and
obligations  under the  Agreement,  the parties  wish to amend the  Agreement as
provided below.

                              AMENDMENT

2.   Grant of Rights to Roche

     2.01     *








     2.02     *







     2.03     *





                                       2
<PAGE>


     2.04 Except as otherwise specifically provided in the Agreement, *





















     2.05 All licenses granted Roche in this Amendment in a country shall become
*

     2.06 Roche shall not have the right to use *



 3.  Limitations

     3.01 Roche's rights to manufacture Compound and formulate Product shall *











     3.02     *




                                       3
<PAGE>



     (a)      *





     (b)      *



     (c)      *



































     (d)      *



                                       4
<PAGE>






































     3.03     *



                                       5
<PAGE>


4.   Markup

     4.01 For the rights  granted  pursuant to the provisions of Paragraphs
     2.01-2.04, *















5.   License grant to Agouron and JT

     5.01 Roche grants Agouron and JT *







     5.02 For the rights granted pursuant to the provisions of Paragraph 5.01, *












     5.03     *


                                       6
<PAGE>


6.   Exchange of Information

     6.01 Immediately after execution of this Amendment by the parties, and
     on an ongoing basis thereafter, *









7.   Supply obligations

     7.01 *









     7.02 *













     7.03 *


      (a)  *





      (b) *





                                       7
<PAGE>







     (c)  *





     (d)  *









     (e)  *












     (f)  *







     7.04 *



                                       8
<PAGE>
















     7.05 *











8.  Schedule 2 of Agreement

     8.01 *















9.   Trademark/Labeling

     9.01 The labeling for any Product to be sold and/or distributed by Roche, *


                                       9
<PAGE>





10.  Remaining Agreement Terms

          10.01  Except as  expressly  amended  by the terms  contained  in this
     Amendment,  the provisions of the Agreement,  as previously amended,  shall
     remain in full force and effect.

          IN WITNESS  WHEREOF,  the parties  have caused  their duly  authorized
     representatives to enter into this Amendment to the VIRACEPT(TM)(Nelfinavir
     Mesylate) License Agreement, effective as of the Effective Date.





AGOURON  PHARMACEUTICALS, INC.         JAPAN TOBACCO INC.


By:  /s/ Gary Friedman                  By: /s/ Masakazu Kakei
Name:   Gary Friedman                   Name: Masakazu Kakei
Title:  Corp. Vice President            Title: Executive Director


By:/s/ R. Kent Snyder                   By: /s/ Tatsuya Yoneyama
Name: R. Kent Snyder                    Name: Tatsuya Yoneyama
Title: Sr. Vice President               Title: Vice President, Business Devel.,
                                               Pharmaceuticals Division
F. HOFFMANN-LA ROCHE LTD

By /s/ St. Arnold
Name: St. Arnold
Title: Vice Director

By: /s/ B. Scholl
Name: B. Scholl
Title: Vice Director






                                       10
<PAGE>





                                   SCHEDULE 1



*



                                      S1-1
<PAGE>



                                   SCHEDULE 2
                   ROCHE DEMAND SCHEDULE FOR VIRACEPT PRODUCT
*

                                      S2-1
<PAGE>
                                   SCHEDULE 2
                   ROCHE DEMAND SCHEDULE FOR VIRACEPT PRODUCT
*

                                      S2-2
<PAGE>
                                   SCHEDULE 2
                   ROCHE DEMAND SCHEDULE FOR VIRACEPT PRODUCT
*

                                      S2-3
<PAGE>
                                   SCHEDULE 2
                   ROCHE DEMAND SCHEDULE FOR VIRACEPT PRODUCT
*

                                   SCHEDULE 2
                   ROCHE DEMAND SCHEDULE FOR VIRACEPT PRODUCT
*

                                      S2-4
<PAGE>
                                   SCHEDULE 2
                   ROCHE DEMAND SCHEDULE FOR VIRACEPT PRODUCT
*

                                      S2-5
<PAGE>
                                  ATTACHMENT 1

1.   *

2.   *

3.   *

4.   *

5.   *

6.   *



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