Exhibit 10.74

CONFIDENTIAL TREATMENT HAS BEEN REQUESTED FOR PORTIONS OF THIS AGREEMENT 
PURSUANT TO AN APPLICATION DATED JANUARY 27, 1997, AS SEPARATELY FILED WITH 
THE SECURITIES AND EXCHANGE COMMISSION.  CONFIDENTIAL PORTIONS ARE INDICATED 
WITH AN ASTERISK ("*"), EXCEPTING THOSE ASTERISKS CONTAINED IN SCIENTIFIC 
FORMULAS CONTAINED IN SECTION 2(A) OF EXHIBIT A.

                                LETTER OF INTENT

     THIS LETTER OF INTENT is made on the 17th day of January 1997, by and 
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 called "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 called "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 called "Roche").  Agouron, JT and Roche are sometimes 
hereinafter referred to as a party (collectively "parties") to this 
Agreement.

                                 Background

     In December 1994, Agouron and JT entered into a Development and 
License Agreement ("D&L Agreement") under which they have collaborated in 
the development and commercialization of the chemical compound known as 
"nelfinavir mesylate" to treat and prevent Human Immunodeficiency Virus 
infections.  Agouron, JT and Roche now agree to enter into a license 
agreement under which Roche will be licensed to sell nelfinavir mesylate in 
certain countries of the world.  This Letter of Intent ("LOI") which shall 
be binding on the parties sets forth the basic license terms upon which the 
parties have agreed.  The full terms of the license will be set forth in a 
definitive agreement to be prepared as described below.

     NOW THEREFORE, the parties agree as follows:

     1.     Terms.  The parties hereby enter into this Letter of Intent to 
confirm their entering into a license agreement on terms substantially in 
accordance with those contained in Exhibit A attached hereto.  The parties 
acknowledge that Exhibit A only states the basic terms of the understanding 
between the parties and is subject to the further negotiation and 
preparation of an agreement containing the full terms of the license between 
the parties ("Definitive Agreement").  Each party agrees to act in good 
faith in an effort to negotiate, execute and deliver the Definitive 
Agreement on or before *                .

     2.     Disclosure.  The parties shall jointly prepare and release a 
statement about the existence of this Letter of Intent and of the license 
between Agouron, JT and Roche.  Except as agreed to by the parties, Agouron, 
JT and Roche shall not release any further information to any third party 
who is not under an obligation of confidentiality with respect thereto about 
any of the terms of this Letter of Intent or of the license without the 
prior written consent of the other parties, 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.  If a party determines that it is 
required by law to release information to any third party regarding the 
terms of this Letter of Intent or the subject matter of the license, it 
shall notify the other parties of this fact prior to releasing the 
information.  The notice to the other parties shall include the text of the 
information proposed for release.  The other parties



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.

     3.     Miscellaneous.  This Letter of Intent contains the entire 
agreement between the parties as to the matters set forth herein and shall 
be construed in accordance with the laws of the State of California, United 
States of America.  Exhibit A describes the parties' understanding with 
respect to the development and sale of nelfinavir mesylate by Roche in 
certain countries of the world.  This Letter of Intent, including Exhibit A, 
shall not be amended, supplemented or otherwise modified, except by an 
instrument in writing signed by duly authorized officers of all of the 
parties.  Roche shall bear all of the expenses incurred by it in connection 
with the negotiation and preparation of this Letter of Intent and the 
Definitive Agreement.  Agouron and JT shall bear all of the expenses 
incurred by them in connection with the negotiation and preparation of this 
Letter of Intent and the Definitive Agreement.  Notwithstanding the 
preceding, the use and disclosure of confidential and proprietary 
information disclosed to Roche for the purpose of determining Roche's 
interest in entering into (and for the subsequent negotiation and 
performance of) a license agreement for Viracept for certain countries of 
the world shall be governed by the terms of the Confidentiality Agreement 
between the parties with an effective date of January 7, 1997.

     IN WITNESS WHEREOF, the parties hereto have executed this Letter of 
Intent by their respective officers thereunto duly authorized, the day and 
year hereinabove written.  This Letter of Intent may be executed in 
counterparts and all of such counterparts taken together shall be deemed to 
constitute one and the same instrument.

AGOURON PHARMACEUTICALS, INC.      JAPAN TOBACCO INC.

By:     /s/ Kent Snyder            By:     /s/ Masamichi Nishimoto          
Name:  Kent Snyder                 Name:   Masamichi Nishimoto               
Title: Vice President              Title:  Executive Vice President          

By:    /s/ Gary Friedman           By:     /s/ Masakazu Kakei               
Name:  Gary Friedman               Name:   Masakazu Kakei               
Title: Vice President              Title:  Managing Director               

F. HOFFMANN-LA ROCHE LTD     

By:    /s/ Werner Henrich                    
Name:  Werner Henrich                    
Title: Director                         

By:    /s/ Dr. Bruno Maier                    
Name:  Dr. Bruno Maier                    
Title: Deputy Director                    



                                  Exhibit A
 
 
1.     JT and Agouron, individually and directly, under terms and conditions 
specified below, hereby grant Roche the exclusive right, even as to 
Agouron and JT, to sell the Product in the Field in the Licensed 
Territory.
 
2.     Definitions:  Except as otherwise set forth herein, items containing 
an initial capitalized letter shall have the meaning stated in the 
Letter of Intent ("LOI") and/or this Exhibit A.
 
      (a) "Product" means nelfinavir mesylate, however formulated, whose 
          chemical name is as follows:
 
           [3S-(3R*, 4aR*, 8aR*, 2'S*, 3'S*)]-2-[2'-hydroxy-3'-
           phenylthiomethyl-4'-aza-5'-oxo-5'-(2''-methyl-3''-
           hydroxyphenyl)pentyl]-decahydroisoquinoline-3-N-t-butyl 
           carboxamide methanesulfonic acid salt,
 
           and whose chemical structure is as follows:
 
<DIAGRAM>
  
 
     (b) "Licensed Territory" means all countries of the world, except 
          for the United States (and its territories, possessions and 
          protectorates, and the District of Columbia), Canada, Mexico, 
          Japan, Taiwan, South Korea, North Korea, and all the countries 
          of Asia listed on Schedule 1 attached hereto.
 
     (c) "Field" means the treatment and prevention of Human 
         Immunodeficiency Virus ("HIV") infections.
 
     (d) "Affiliate" means any person, organization or entity which is, 
         directly or indirectly, controlling, controlled by, or under 
         common control with Roche, Agouron or JT, 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 or entity, means the possession, 
         directly or indirectly, of the power to direct or cause the 
         direction of the management and 
 
                                     A-1
 
 
        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.  For purposes of this Agreement, 
        Genentech, Inc. shall be considered to be an Affiliate of Roche.
 
     (e) "Major European Country" means the *                                   
 
 
     (f) "MAA" means Marketing Authorization Application.
 
     (g) "EMEA" means the European Agency for the Evaluation of Medicinal 
         Products.
 
     (h) "D&L Agreement" means the December 1, 1994 Development and 
         License Agreement between Agouron and JT.
 
3.     The term of this license will extend on a country-by-country basis 
from the effective date of the signing of the LOI to which this 
Exhibit A is an attachment, until the later of:  (i) the last to 
expire of any patents covering the Product in a country; or (ii) *   years 
after the date of the initial commercial launch of the Product in such 
country.
 
4.     With the consent of JT and Agouron, whose consent shall not be 
unreasonably withheld, Roche shall have the right to sublicense its 
rights in the Product in one or more countries of the Licensed 
Territory.
 
5.     Subject to the provisions of the D&L Agreement, Agouron may *         

be agreed upon by the parties after discussions between Roche and 
Agouron.  Subject to the provisions of the D&L Agreement, JT may *            
 
                                                         to 
be agreed upon by the parties after discussions between Roche and JT.  
The terms of the *     

                     modified to reflect the *                      
 

 
6.     Until *               except for the countries of *                  
 
            in countries where either JT or Agouron control the 
exclusive rights to the Product, *                                      
 

                            On or before *            
               the parties agree to further discuss the *                       
 


 
                                     A-2
 
 
                           For purposes of this paragraph, JT and 
Agouron shall not be considered independent third parties.
 
7.     Except as otherwise agreed to by the parties, Agouron and JT will be 
responsible for
completing in a reasonable manner and funding the studies  *                   
 
studies include the core development program studies designed to 
achieve registration of the Product in the Field in the major 
countries of the Licensed Territory.  The parties acknowledge that 
Agouron and JT despite reasonable diligence may be unable to *        





 
8.     In collaboration with Roche, Agouron will be responsible for *          
 

                                              and will have 
the primary responsibility for *                                               
 


             Roche and its Affiliates will provide assistance, as 
necessary, to *             





                                                    Roche 
will have the primary responsibility for the *                                  
  
                                               Roche will be 
responsible for *                                                        
 

 
9.     Alterations to the *           which are required for *                  
 
                                         will be the 
responsibility of *                                Except as 
otherwise agreed to by the parties, Roche will be responsible for *         
 




 
10.     Roche will be responsible for *                                    
(other than those *               ) which involve the *                       
 
               (including *                                        
 
                                   ). Roche will be responsible 
for the 
 
                                     A-3
 
 
*

 
11.    A party conducting a study involving the Product will assist the other 
parties in the incorporation of the data from such study into their  
dossiers, if necessary.  *               





 
12.    Roche will be responsible for the cost and implementation (possibly in 
cooperation with a previously-contracted contract research 
organization) of an expanded access program in Europe and Australia 
which will be consistent in scope with the expanded access program 
implemented by Agouron in North America. 
 
13.    Roche shall use reasonable diligence in the development and 
registration of the Product in the Field in the countries of the 
Licensed Territory.  Reasonable diligence shall mean at least the 
comparable standard of effort used by Roche in *                       
 

                                               If, after *   
days written notice of the failure by Roche to use reasonable 
diligence in the development and registration of the Product in the 
Field in a country located in the Licensed Territory Roche fails to 
fulfill its obligations under this paragraph, such failure shall be 
deemed to be an election pursuant to *                                        
 

 
14.    Roche will purchase the Product from JT or Agouron directly as 
determined by JT and Agouron,*


 
15.    Roche will make the following license issue fee payments to Agouron 
and JT directly.
 
 
 On January 24, 1997
      To Agouron                            USD 9 million
      To JT                                 USD 9 million
 
 Within thirty (30) days of first regulatory approval
 in a Major European Country or upon marketing 
 authorization from the European Commission
      To Agouron                           USD 11 million
      To JT                                USD 11 million
                                           --------------
                    TOTAL                  USD 40 million 
 
 
                                     A-4
 
 
16.    * 
                                    will be consistent with the 
*           
                                         will modify the *           
 
          only to the extent required to respond to *          
           and implement *                                                   
 

                                                         As 
they deem appropriate, Agouron, JT and their licensees will *                 
 


 
17.    It is the intent of the parties that a single trademark be identified 
and developed for use in connection with marketing the Product in the 
Field wherever possible throughout the Territory.  The parties 
acknowledge their intention to  use the VIRACEPT (R) trademark in 
connection with the marketing of the Product in the Field wherever 
possible.  Unless otherwise agreed and as permitted by law, Roche will  
sell the Product under the VIRACEPT brand name in all countries of the 
Licensed Territory.  The parties also acknowledge their intention to  
use, if appropriate, the same trade dress in connection with the 
marketing of the Product in the Field wherever possible.  In  
countries where Roche is  exclusively marketing the Product, unless 
prohibited by law or regulation, the labeling for the Product shall 
state that the Product is licensed from Agouron and JT.
 
18.    *












 
19.     *                                   Roche using diligent 
marketing efforts, agrees to provide sales and other promotional 
support for the Product in each country in the Licensed Territory 
which is equivalent to or greater than that which Roche, its 
Affiliates and/or sublicenses are providing *                              
After the *            Roche will provide a reasonable level of 
sales and other promotional support for the Product in each country in 
the Licensed Territory which, when measured as a percentage of 
adjusted gross product sales in such country, is equivalent to or 
greater than that which Roche, its Affiliates and/or sublicenses are 
providing for *                        

shall be attributed to          *.  If, after *           written 
notice of the failure by Roche to 
 
                                     A-5
 
 
provide the agreed upon level of 
sales and other promotional support for the Product in a country 
located in the Licensed Territory Roche fails to fulfill its 
obligation under this Paragraph, Agouron and JT shall have the right, 
*                             







 
20.     Roche shall keep Agouron and JT informed of its progress in the 
development and registration of the Product.  This shall include, at 
least *                the regular meetings of the parties and such 
written progress reports as are agreed to by the parties summarizing 
Roche's activities during each reporting period and Roche's planned 
activities for the succeeding period.  Agouron and JT shall keep Roche 
informed of their development and registration activities to the 
extent that such development and registration activities are relevant 
to the development and registration of the Product by Roche in the 
Licensed Territory.  Each of the parties will *                             
 
                               each representative shall report 
to his/her management on the matters discussed at each of the meetings 
of the parties.  Each party, prior to the implementation of *     
                     will provide the other parties with a copy of 
the *                     and an opportunity in a timely manner to 
comment on the *                                         


                                Roche agrees to use its diligent 
efforts in responding in a timely manner, but not more than *     
      to requests from Agouron or JT for information *
 
21.     Roche shall keep Agouron and JT informed of *                          
 
                   This shall include, at least *                    
the regular meetings of the parties and such written progress reports 
as are agreed to by the parties summarizing Roche's activities during 
each reporting period and Roche's planned activities for the Product 
for the succeeding period.  Each of the parties will *                     
 
                               each representative shall report 
to his management on the matters discussed at each of the meetings of 
the parties.  The representatives of the parties at the meeting will 
review and discuss *                      


                                                        Each 
party agrees to inform the other parties, *                                    
 

 
                                     A-6
 
 
 
22.     Agouron, JT and Roche each acknowledge the interests of the other 
parties *                    


            The parties also recognize their mutual interests in 
obtaining *                  
                      Consequently, a party, its employees or 
consultants 
*




                     Furthermore, in acknowledgment that certain *         
 

                               the parties agree that each party 
shall 
*







                           After giving reasonable consideration 
to the suggestions of the objecting party, the party wishing to *               
 

 
23.     Roche will pay JT and Agouron directly, a royalty based on the net 
sales of the Product by Roche, its Affiliates and sublicenses, 
consolidated into CHF, in amounts which equal the greater of:  (i) the 
royalty amounts calculated according to Schedule 1 below (Product 
only); or (ii) the royalty amounts calculated according to Schedule 2 
below (Product and any formulations of INVIRASE which Roche markets 
with royalties being calculated separately for the consolidated annual 
net sales of the Product and INVIRASE).  Schedule 2 shall not apply to 
net sales in a country until the Product is approved and available for 
sale in such country.  The following royalties shall be divided 
equally between JT and Agouron.
 
 Schedule 1
 
 Royalty Rate 
 Per Consolidated                     Consolidated Annual Net Sales Level 
 Annual Net Sales Level               of the Product in Licensed Territory
 ----------------------             --------------------------------------
      *                              <= CHF   *                
      *                               > CHF   *             / <= CHF    * 
      *                               > CHF   *                 
 
 
                                     A-7
 
 
 Schedule 2
 
                                    Consolidated Annual Net Sales Level for
                                    the Product and INVIRASE in the Licensed
                                    Territory (With Royalties Being 
 Royalty Rate                       Calculated Separately for the 
 Per Consolidated                   Consolidated Annual Net Sales of the
 Annual Net Sales Level             Product and INVIRASE) 
 ----------------------             --------------------------------------
      *                             <= CHF   *                
      *                             > CHF   *             / <= CHF    * 
      *                             > CHF   *                 
 
24.    If either:  (i) regulatory approval for the Product is not obtained in 
a Major European Country prior to *           or (ii) marketing 
authorization for the Product is not obtained from the European 
Commission prior to *                the royalty rate for Schedule 2 
will be adjusted as follows:
 
 Schedule 2
 
                                    Consolidated Annual Net Sales Level for
                                    the Product and INVIRASE in the 
                                    Licensed Territory (With Royalties
 Royalty Rate                       Being Calculated Separately for the
 Per Consolidated                   Consolidated Annual Net Sales of the
 Annual Net Sales Level             Product and INVIRASE)                  
 ----------------------             --------------------------------------
      *                             <= CHF   *                
      *                             > CHF   *             / <= CHF    * 
      *                             > CHF   *                 
 
25.    If either:  (i) regulatory approval for the Product is not obtained in 
a Major European Country prior to *           or (ii) marketing 
authorization for the Product is not obtained from the European 
Commission prior to *                Schedule 2 will not apply and 
Roche will be obligated to pay JT and Agouron directly, royalties 
according to Schedule 1 only.
 
26.     Roche agrees not to market any other HIV protease inhibitors in the 
Licensed Territory during the term of the agreement, unless sales for 
such product(s) are included in the consolidated net sales calculation 
according to Schedule 2.
 
27.     *      despite reasonable efforts to * 
 


                                                   provided, 
however, that in no case will *                                     

                The parties acknowledge that the *                 



                that the provisions of this paragraph do not apply 
to *           

                                     A-8


                                                 The parties 
specifically acknowledge that *                                           
 


                                   Notwithstanding the 
preceding, *      


which are then being commercially used in the manufacture of the 
Product, the parties will * 

 
28.     In any country where the amount of third party unlicensed sales of 
drug products containing nelfinavir mesylate for a quarterly period 
exceed *     of the total sales of all drug products containing 
nelfinavir mesylate in such country for such quarterly period, 
royalties due on the net sales of the Product in such country for such 
quarterly period will be *  
 
29.     Roche will purchase the Product from Agouron or JT directly, for sale 
in the Licensed Territory at a price which *      
  


 
30.     *                                                        and 
if Agouron or JT, independently or jointly, *      
 




 
31.     Roche will assist Agouron and JT in the  identification of low-cost 
manufacturing sources for the Product.  Roche will also provide 
without charge, to the extent available,  technical and manufacturing 
assistance and use of its technology and proprietary information to 
Agouron and JT in an effort to decrease the production costs of the 
Product.  Agouron and JT agree to discuss in good faith with Roche an 
arrangement under which Roche could  be the contract manufacturer of 
the Product to be used in the Licensed Territory, including the 
prerequisite requirement that *                                           
 


Notwithstanding the preceding, Agouron and JT shall be entitled to *
             
 

      including the right to continue their *    
 

 
32.      *





                                     A-9


      Subject to the provisions of the D&L Agreement, in the event 
that * 

                            Agouron and JT, their Affiliates and 
sublicensees shall be free, without any further action by Agouron, JT 
or Roche and without any further obligation to Roche and its 
Affiliates, to *                                               


                               provided that Agouron and JT 
shall not 
*

           For purposes of this paragraph, Roche's *
 


                                In the event of *
 
                                                     pursuant 
to the terms of this paragraph:  (i) the *
 
                    (ii) Agouron and JT, their Affiliates and 
sublicensees shall 
*

           (iii) Roche shall *                                  
                                                 and 
(iv) Roche shall 
*
                                                   Roche 
shall be responsible for *                                               
 



 
33.     Roche may elect to *                                               
           In the event that Roche elects to *                           
 
            , subject to the provisions of the D&L Agreement:  (i) 
Agouron and JT shall 
*
                          (ii) Agouron and JT will *                     
 
                                        (iii) Roche shall *                    
 

                and (iv) Roche shall *                                       
 

 
34. This Agreement shall be assignable by Agouron and JT, but shall not be 
assignable by Roche, except to an Affiliate, without the prior written 
consent of Agouron and JT, which consent may be withheld at the sole 
discretion of Agouron and JT.  Any such assignment without the prior 
written consent of Agouron and JT shall be void.  If this Agreement is 
assigned to an Affiliate, Roche shall still be responsible for all of 
its obligations specified in this Agreement.  Notwithstanding the 
preceding, in the event of:  (i) a sale or transfer of all or 
substantially all of Roche's assets; or (ii) the merger or 

                                     A-10


consolidation of Roche with another company, this Agreement shall be 
assignable to the transferee or successor company. 
 
35.     *




                                     A-11




 
   
                          SCHEDULE 1 TO EXHIBIT A
                              ASIAN COUNTRIES


*
*
*
*
*
*
*
*
*
*
*
*
*
*

Licenses in the above-listed countries shall be subject to compliance by 
Roche with the United States laws and regulations governing exports and re-
exports of the Product and any technology developed or disclosed as a result 
of this Agreement.

                                       S1-1


                            SCHEDULE 2 TO EXHIBIT A
                       NELFINAVIR MESYLATE *                        


Protocol      Title
  *           *
  *           *
  *           *
  *           *
  *           *
  *           *
  *           *
  *           *
  *           *
  *           *
  *           *
  *           *
  *           *
  *           *
  *           *
  *           *
  *           *


                                       S2-1


Protocol      Title
  *           *
  *           *
  *           *
  *           *
  *           *
  *           *

                                       S2-2


Protocol      Title
  *           *
  *           *
  *           *
  *           *
  *           *
  *           *
  *           *
  *           *
  *           *

                                       S2-3