TRIANGLE PHARMACEUTICALS INC
SC 13D, 1996-11-12
PHARMACEUTICAL PREPARATIONS
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549



                                  SCHEDULE 13D

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934

                          (AMENDMENT NO. ___________)*

                         TRIANGLE PHARMACEUTICALS, INC.
- -------------------------------------------------------------------------------
                                (Name of Issuer)
                     Common Stock, $.001 par value per share
- -------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                  89589H 10 4
                                 (CUSIP Number)

R.S.M. Baird                                     Robin A. Painter
The Wellcome Trust Limited as                    Testa, Hurwitz & Thibeault, LLP
   Trustee for The Wellcome Trust                125 High Street
183 Euston Road                                  Boston, MA 02110
London NW1 2BE                                   617-248-7000
ENGLAND

- --------------------------------------------------------------------------------
            (Name, Address and Telephone Number of Person Authorized
                     to Receive Notices and Communications)

                                November 1, 1996
- --------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)


If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [ ].

Check the following box if a fee is being paid with the statement [ ]. (A fee is
not required only if the reporting person:  (1) has a previous statement on file
reporting  beneficial  ownership  of more  than  five  percent  of the  class of
securities  described  in Item 1;  and (2) has  filed  no  amendment  subsequent
thereto reporting  beneficial  ownership of five percent or less of such class.)
(See Rule 13d-7.)

NOTE: Six copies of this statement, including all exhibits, should be filed with
the  Commission.  See Rule  13d-1(a) for other  parties to whom copies are to be
sent.

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for any  subsequent  amendment  containing  information  which  would  alter the
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).







                                  SCHEDULE 13D

- ---------------------------                            -------------------------
CUSIP NO. 89589H 10 4                                   PAGE  2  OF  5 PAGES
- ---------------------------                            -------------------------

- ---------- ---------------------------------------------------------------------
    1      NAME OF REPORTING  PERSON THE WELLCOME  TRUST  LIMITED AS TRUSTEE FOR
           THE WELLCOME TRUST S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON:
           98 6038 021
- ---------- ---------------------------------------------------------------------

    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*       (a) [  ]
                                                                   (b) [  ]
- ---------- ---------------------------------------------------------------------
    3      SEC USE ONLY

- ---------- ---------------------------------------------------------------------
    4      SOURCE OF FUNDS*

           WC
- ---------- ---------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED    [  ]
           PURSUANT TO ITEMS 2(d) or 2(e)
- ---------- ---------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION

           England
- ---------- ---------------------------------------------------------------------
                                7     SOLE VOTING POWER

         NUMBER OF                    1,300,000
          SHARES             -------- ------------------------------------------
       BENEFICIALLY             8     SHARED VOTING POWER
         OWNED BY
          EACH
        REPORTING            -------- ------------------------------------------
         PERSON                  9     SOLE DISPOSITIVE POWER
          WITH
                                       1,300,000
                             -------- ------------------------------------------
                                10     SHARED DISPOSITIVE POWER


- --------------------------------------------------------------------------------
   11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,300,000
- ---------- ---------------------------------------------------------------------

   12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN   [  ]
           SHARES*

- ---------- ---------------------------------------------------------------------

   13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

           7.5%
- ---------- ---------------------------------------------------------------------
  14      TYPE OF REPORTING PERSON *

           OO
- ---------- ---------------------------------------------------------------------


                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
      (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.



                              Page _2_ of _5_ Pages






Item 1.    SECURITY AND ISSUER:

           This  Statement  relates to the  common  stock,  par value $0.001 per
           share, of Triangle  Pharmaceuticals,  Inc., whose principal executive
           offices are located at 4 University  Place,  4611  University  Drive,
           Durham, North Carolina 27707.

Item 2.    IDENTITY AND BACKGROUND:

           The Wellcome  Trust  Limited is Trustee for the  Wellcome  Trust (the
           "Trust")  which is an English  charity  registered  with the  Charity
           Commissioners  for  England  and  Wales  under  number  210,183,  the
           principal  objectives  of which are the  advancement  of  research in
           human and animal medicine and the support of the history of medicine.
           The Trust's principal business and office address is 183 Euston Road,
           London NW1 2BE, England. During the last five years the Trust has not
           been  convicted in a criminal  proceeding  or been a party to a civil
           proceeding  of  a  judicial  or  administrative   body  of  competent
           jurisdiction  as a result of which the Trust was or is  subject  to a
           judgment,  decree or final order enjoining  future  violations of, or
           prohibiting  or  mandating  activities  subject to,  Federal or State
           securities laws or finding any violation with respect to such laws.

ITEM 3.    SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION:

           The Trust  acquired  the  securities  of the Issuer  through the cash
           purchase of 1,000,000 shares of Series B Convertible  Preferred Stock
           at a price  of $5.00  per  share on June  11,  1996  (the  "Preferred
           Shares") and the cash purchase of 300,000 shares of common stock at a
           price of $10.00 per share in  connection  with the  Issuer's  initial
           public offering (the "IPO").  Upon the  effectiveness of the IPO, all
           of the Trust's  Preferred Shares were converted into the common stock
           of the Issuer.  As a consequence of such  conversion and the purchase
           of  the  common  stock  in  connection  with  the  IPO,  the  Trust's
           beneficial  ownership in the Issuer  currently  consists of 1,300,000
           shares of common stock (the "Shares").

Item 4.    PURPOSE OF TRANSACTION:

           Shares reported as being beneficially owned by the Trust are held for
           investment  purposes.  The Trust has no present  plan or  proposal or
           purpose to effect substantial changes in the business,  organization,
           form or control of the Issuer.

Item 5.    INTEREST IN SECURITIES OF THE ISSUER:

           (a) On November  1, 1996,  the  aggregate  number of shares of common
           stock of the Issuer  beneficially  owned by the Trust was  1,300,000,
           representing  7.5%  of  the  issued  and  outstanding  shares  of the
           Issuer's  common stock (based on  information  provided to the filing
           entity by the Issuer).

           (b)  The Trust has the sole power to vote and dispose of the Shares.

           (c) On November 1, 1996 in  connection  with  Issuer's IPO, the Trust
           acquired  300,000  shares  of  the  common  stock  of the  Issuer  as
           described in Item 3 above.

Item 6.    CONTRACTS,  ARRANGEMENTS,   UNDERSTANDINGS   OR  RELATIONSHIPS   WITH
           RESPECT TO SECURITIES OF THE ISSUER.

           Restated Investors' Rights Agreement.

           Upon the  effectiveness  of the Issuer's IPO,  shares of the Issuer's
           preferred  stock were  converted  into common  stock (the  "Converted
           Shares"). The Trust and other holders of the Converted



                              Page _3_ of _5_ Pages




           Shares  (the  "Holders")  and the  Issuer  are  parties  to a certain
           Restated  Investors'  Rights Agreement  pursuant to which the Holders
           are entitled to certain  rights with respect to the  registration  of
           the  Converted  Shares under the  Securities  Act of 1933, as amended
           (the "Securities Act"). If the Issuer proposes to register any of its
           securities  under the Securities  Act,  either for its own account or
           for the account of other Holders exercising registration rights, such
           Holders are entitled to notice of such  registration and are entitled
           to include shares of common stock therein. A majority of such Holders
           are also entitled to certain demand  registration  rights pursuant to
           which they may  require the Issuer to file a  registration  statement
           under the Securities Act. Further, the Holders may require the Issuer
           to file additional registration statements on Form S-3.

Item 7.    MATERIAL TO BE FILED AS EXHIBITS.

           Exhibit 1.  Restated Investors' Rights Agreement





                              Page _4_ of _5_ Pages



                                  SCHEDULE 13D


- --------------------------------                     ---------------------------
CUSIP NO. 89589H 10 4                                PAGE  5  OF  5  PAGES
- -------------------------------                      ---------------------------


SIGNATURE

         After reasonable  inquiry and to the best of my knowledge and belief, I
certify that the information  set forth in this statement is true,  complete and
correct.


Date:        November 12, 1996                    THE WELLCOME TRUST LIMITED AS
     -----------------------------                TRUSTEE OF THE WELLCOME TRUST


                                                  By:/s/ Robert Baird
                                                     ---------------------------
                                                  Its:   Investment Manager



                              Page _5_ of _5_ Pages




                                                                       EXHIBIT 1

                         TRIANGLE PHARMACEUTICALS, INC.
                      RESTATED INVESTORS' RIGHTS AGREEMENT

                              --------------------

                                  June 11, 1996



                                TABLE OF CONTENTS

                                                                            Page
                                                                            ----

 l.      Registration Rights                                                  1

         1.1      Definitions                                                 1
         1.2      Request for Registration                                    2
         1.3      Company Registration                                        4
         1.4      Obligations of the Company                                  4
         1.5      Furnish Information                                         6
         1.6      Expenses of Demand Registration                             6
         1.7      Expenses of Company Registration                            6
         1.8      Underwriting Requirements                                   7
         1.9      Delay of Registration                                       7
         1.10     Indemnification                                             7
         1.11     Reports Under Securities Exchange Act of 1934              10
         1.12     Form S-3 Registration                                      11
         1.13     Assignment of Registration Rights                          12
         1.14     Limitations on Subsequent Registration Rights              12
         1.15     "Market Stand-Off" Agreement                               13
         1.16     Termination of Registration Rights                         13

2.      Covenants of the Company                                             14

         2.1      Delivery of Financial Statements                           14
         2.2      Inspection                                                 14
         2.3      Termination of Information, Inspection and First
                    Offer Covenants                                          14
         2.4      Right of First Offer                                       15
         2.5      Key-Person Insurance                                       16
         2.6      Indemnification                                            17

3.       Miscellaneous                                                       17

         3.1      Successors and Assigns                                     17
         3.2      Governing Law                                              17
         3.3      Counterparts                                               17
         3.4      Titles and Subtitles                                       17
         3.5      Notices                                                    17
         3.6      Expenses                                                   17
         3.7      Amendments and Waivers                                     18
         3.8      Additional Investors                                       18
         3.9      Severability                                               18
         3.10     Aggregation of Stock                                       19
         3.11     Entire Agreement                                           19
         3.12     Representation                                             19
         3.13     Board Representation                                       19
         3.14     Restatement of Prior Agreement                             20

SCHEDULE A Schedule of Investors

                                       i.




                  RESTATED INVESTORS' RIGHTS AGREEMENT

                  THIS RESTATED  INVESTORS'  RIGHTS  AGREEMENT is made as of the
11th day of June, 1996, by and among Triangle Pharmaceuticals,  Inc., a Delaware
corporation  (the  "Company"),  and each of the persons and  entities  listed on
Schedule  A  hereto,  each of which is  referred  to herein  individually  as an
"Investor"  and  all  of  which  are  referred  to  herein  collectively  as the
"Investors."
                                RECITALS

                  WHEREAS, the Company and certain of the Investors (the "Series
A Investors")  are parties to a certain Amended and Restated  Investors'  Rights
Agreement  dated as of October  31, 1995 (the  "Prior  Agreement"),  pursuant to
which the Company has granted to the Series A Investors  certain rights to cause
the  Company  to  register  shares  of Common  Stock  issuable  to the  Series A
Investors upon conversion of the Company's Series A Preferred Stock, and certain
other matters as set forth therein;

                  WHEREAS, the Company and certain of the Investors (the "Series
B Investors") are parties to the Series B Preferred Stock Purchase  Agreement of
even date herewith (the "Series B Agreement"); and

                  WHEREAS,  in order to induce  the  Company  to enter  into the
Series B Agreement  and to induce the Series B Investors  to purchase  shares of
the Company's  Series B Preferred Stock pursuant to the Series B Agreement,  the
Investors  and the Company  hereby agree that this  Agreement  shall restate the
Prior  Agreement  so that this  Agreement  shall govern the rights of all of the
Investors to cause the Company to register  shares of Common  Stock  issuable to
the Investors upon conversion of their shares of the Company's  Preferred Stock,
and certain other matters as set forth herein.

                  NOW, THEREFORE, THE PARTIES HEREBY AGREE AS FOLLOWS:

                  1. Registration  Rights.  The Company covenants and agrees as
         follows:

                  1.1 Definitions. For purposes of this Section 1:

                  (a) The term  "Act"  means  the  Securities  Act of  1933,  as
         amended.

                  (b) The term  "Form  S-3"  means such form under the Act as in
         effect  on the date  hereof  or any  registration  form  under  the Act
         subsequently   adopted   by  the  SEC  which   permits   inclusion   or
         incorporation   of  substantial   information  by  reference  to  other
         documents filed by the Company with the SEC.






                  (c) The term  "Holder"  means any person  owning or having the
right to acquire  Registrable  Securities or any assignee  thereof in accordance
with Section 1.13 hereof.

                  (d) The term "1934 Act" shall mean the Securities Exchange Act
of 1934, as amended.

                  (e) The  term  "register",  "registered,"  and  "registration"
refer  to a  registration  effected  by  preparing  and  filing  a  registration
statement or similar document in compliance with the Act, and the declaration or
ordering of effectiveness of such registration statement or document.

                  (f) The term  "Registrable  Securities"  means (i) the  Common
Stock issuable or issued upon conversion of the Series A Preferred  Stock,  (ii)
the Common Stock  issuable or issued upon  conversion  of the Series B Preferred
Stock and (iii) any Common Stock of the Company  issued as (or issuable upon the
conversion or exercise of any warrant,  right or other  security which is issued
as) a dividend or other  distribution  with respect to, or in exchange for or in
replacement  of the shares  referenced  in (i) and (ii) above,  excluding in all
cases, however, any Registrable  Securities sold by a person in a transaction in
which his rights under this Section 1 are not assigned.

                  (g) The  number  of  shares of  "Registrable  Securities  then
outstanding"  means the number of shares of Common Stock  outstanding which are,
and the number of shares of Common Stock issuable  pursuant to then  exercisable
or convertible securities which are, Registrable Securities. 


                  (h) The term "SEC"  shall  mean the  Securities  and  Exchange
Commission.


                  1.2 Request for Registration.

                  (a) If the Company shall receive at any time after the earlier
of (i) July 19,  2000,  or (ii) six (6) months after the  effective  date of the
first registration  statement for a public offering of securities of the Company
(other than a registration  statement  relating either to the sale of securities
to  participants  in a  Company  stock  plan or a SEC Rule 145  transaction),  a
written  request  from the Holders of a majority of the  Registrable  Securities
then  outstanding  that the Company file a registration  statement under the Act
covering the  registration  of at least thirty percent (30%) of the  Registrable
Securities then  outstanding (or a lesser percent of the Registrable  Securities
if the anticipated  aggregate offering price, net of underwriting  discounts and
commissions, would exceed $10,000,000), then the Company shall:

                           (i) within ten (10) days of the receipt thereof, give
written notice of such request to all Holders; and


                                       2.




                           (ii) effect as soon as practicable,  and in any event
within ninety (90) days of the receipt of such request,  the registration  under
the  Act  of  all  Registrable  Securities  which  the  Holders  request  to  be
registered, subject to the limitations of subsection 1.2(b).

                  (b)  If  the  Holders  initiating  the  registration   request
hereunder ("Initiating Holders") intend to distribute the Registrable Securities
covered by their request by means of an  underwriting,  they shall so advise the
Company as a part of their request made  pursuant to  subsection  1.2(a) and the
Company  shall include such  information  in the written  notice  referred to in
subsection  1.2(a). The underwriter will be selected by the Company and shall be
reasonably  acceptable to a majority in interest of the Initiating  Holders.  In
such event,  the right of any Holder to include his  Registrable  Securities  in
such registration shall be conditioned upon such Holder's  participation in such
underwriting  and the inclusion of such Holder's  Registrable  Securities in the
underwriting  (unless otherwise mutually agreed by a majority in interest of the
Initiating  Holders and such Holder) to the extent provided herein.  All Holders
proposing  to  distribute  their  securities  through  such  underwriting  shall
(together  with the  Company as  provided in  subsection  1.4(e))  enter into an
underwriting  agreement in customary form with the  underwriter or  underwriters
selected  for such  underwriting.  Notwithstanding  any other  provision of this
Section 1.2, if the underwriter  advises the Initiating  Holders in writing that
marketing   factors  require  a  limitation  of  the  number  of  shares  to  be
underwritten,  then the  Initiating  Holders  shall so  advise  all  Holders  of
Registrable  Securities  which would otherwise be underwritten  pursuant hereto,
and the number of shares of Registrable  Securities  that may be included in the
underwriting  shall be  allocated  among  all  Holders  thereof,  including  the
Initiating  Holders,  in proportion (as nearly as  practicable) to the amount of
Registrable Securities of the Company owned by each Holder;  provided,  however,
that the  number of shares of  Registrable  Securities  to be  included  in such
underwriting shall not be reduced unless all other securities are first entirely
excluded from the underwriting.

                  (c)  Notwithstanding  the  foregoing,  if  the  Company  shall
furnish to Holders requesting a registration  statement pursuant to this Section
1.2, a certificate  signed by the  President of the Company  stating that in the
good  faith  judgment  of the Board of  Directors  of the  Company,  it would be
seriously  detrimental to the Company and its stockholders for such registration
statement to be filed and it is therefore  essential to defer the filing of such
registration statement,  the Company shall have the right to defer taking action
with  respect to such  filing for a period of not more than one  hundred  twenty
(120) days after  receipt of the request of the  Initiating  Holders;  provided,
however,  that the Company  shall be entitled to issue such a  certificate  only
once in any given twelve (12) month period.

                  (d) In addition, the Company shall not be obligated to effect,
or to take any action to effect, any registration pursuant to this Section 1.2:


                                       3.



                                 (i)  After  the   Company  has   effected   two
registrations  pursuant  to this  Section 1.2 and such  registrations  have been
declared or ordered effective;

                                 (ii) During the period  starting  with the date
thirty  (30) days  prior to the  Company's  good faith  estimate  of the date of
filing  of,  and  ending  on a date one  hundred  eighty  (180)  days  after the
effective date of, a registration  subject to Section 1.3 hereof;  provided that
the Company is actively  employing in good faith all reasonable efforts to cause
such registration statement to become effective; or

                                 (iii)  If the  Initiating  Holders  propose  to
dispose of shares of Registrable  Securities that may be immediately  registered
on Form S-3 pursuant to a request made pursuant to Section 1.12 below.

                  1.3 Company Registration. If (but without any obligation to do
so) the Company proposes to register  (including for this purpose a registration
effected by the  Company for  stockholders  other than the  Holders)  any of its
stock or other  securities  under the Act in connection with the public offering
of such securities solely for cash (other than a registration relating solely to
the sale of securities to  participants  in a Company stock plan, a registration
on any form which does not include  substantially  the same information as would
be required to be included in a registration  statement covering the sale of the
Registrable  Securities,  a  registration  in  connection  with a SEC  Rule  145
transaction or a registration in which the only Common Stock being registered is
Common Stock issuable upon  conversion of debt  securities  which are also being
registered),  the Company shall, at such time, promptly give each Holder written
notice of such  registration.  Upon the  written  request of each  Holder  given
within  twenty  (20)  days  after  mailing  of such  notice  by the  Company  in
accordance  with Section 3.5, the Company  shall,  subject to the  provisions of
Section  1.8,  cause  to be  registered  under  the Act  all of the  Registrable
Securities that each such Holder has requested to be registered.

                  1.4 Obligations of the Company.  Whenever  required under this
Section 1 to effect the registration of any Registrable Securities,  the Company
shall, as expeditiously as reasonably possible:

                  (a)  Prepare  and file with the SEC a  registration  statement
with respect to such  Registrable  Securities  and use its best efforts to cause
such registration  statement to become  effective,  and, upon the request of the
Holders of a majority of the Registrable Securities registered thereunder,  keep
such registration  statement  effective for a period of up to the earlier of one
hundred  twenty  (120)  days  or  until  the  distribution  contemplated  in the
Registration  Statement has been  completed;  provided,  however,  that (i) such
120-day  period  shall be extended  for a period of time equal to the period the
Holder refrains from selling any securities included in such registration at the
request of an underwriter of Common Stock (or other  securities) of the Company;
and

                                       4.




(ii) in the case of any registration of Registrable Securities on Form S-3 which
are intended to be offered on a continuous or delayed basis, such 120-day period
shall be extended,  if necessary,  to keep the registration  statement effective
until all such Registrable  Securities are sold,  provided that Rule 415, or any
successor  rule under the Act,  permits an offering on a  continuous  or delayed
basis,  and provided  further that applicable  rules under the Act governing the
obligation  to file a  post-effective  amendment  permit,  in lieu of  filing  a
post-effective  amendment which (I) includes any prospectus  required by Section
10(a)(3) of the Act or (II) reflects facts or events  representing a material or
fundamental  change in the information set forth in the registration  statement,
the incorporation by reference of information required to be included in (I) and
(II) above to be contained in periodic  reports filed  pursuant to Section 13 or
15(d) of the 1934 Act in the registration statement.

                  (b)  Prepare  and  file  with  the  SEC  such  amendments  and
supplements to such registration statement and the prospectus used in connection
with  such  registration  statement  as may be  necessary  to  comply  with  the
provisions of the Act with respect to the disposition of all securities  covered
by such registration statement.

                  (c)  Furnish  to the  Holders  such  numbers  of  copies  of a
prospectus,   including  a  preliminary  prospectus,   in  conformity  with  the
requirements of the Act, and such other documents as they may reasonably request
in order to facilitate the disposition of Registrable Securities owned by them.

                  (d)  Use  its  best   efforts  to  register  and  qualify  the
securities covered by such registration statement under such other securities or
Blue Sky laws of such  jurisdictions  as shall be  reasonably  requested  by the
Holders; provided that the Company shall not be required in connection therewith
or as a condition thereto to qualify to do business or to file a general consent
to service of process in any such states or jurisdictions.

                  (e) In the event of any underwritten  public  offering,  enter
into and perform its obligations under an underwriting  agreement,  in usual and
customary  form,  with the managing  underwriter of such  offering.  Each Holder
participating  in such  underwriting  shall  also  enter  into and  perform  its
obligations under such an agreement.

                  (f) Notify each Holder of  Registrable  Securities  covered by
such  registration  statement at any time when a prospectus  relating thereto is
required to be delivered under the Act of the happening of any event as a result
of which the prospectus  included in such  registration  statement,  as then  in
effect,  includes  an untrue  statement  of a material  fact or omits to state a
material fact required to be stated  therein or necessary to make the statements
therein not misleading in the light of the circumstances then existing.


                                       5.




                  1.5 Furnish Information.

                  (a) It shall be a condition  precedent to the  obligations  of
the Company to take any action  pursuant to this  Section 1 with  respect to the
Registrable  Securities of any selling  Holder that such Holder shall furnish to
the Company such information  regarding itself, the Registrable  Securities held
by it, and the intended  method of  disposition  of such  securities as shall be
required to effect the registration of such Holder's Registrable Securities.

                  (b) The Company shall have no  obligation  with respect to any
registration  requested  pursuant to Section 1.2 or Section  1.12 if, due to the
operation  of  subsection  1.5(a),  the  number  of  shares  or the  anticipated
aggregate  offering  price of the  Registrable  Securities to be included in the
registration  does not equal or exceed the  number of shares or the  anticipated
aggregate offering price required to originally trigger the Company's obligation
to initiate such  registration  as specified in subsection  1.2(a) or subsection
1.12(b), whichever is applicable.

                   1.6 Expenses of Demand Registration.  All expenses other than
underwriting   discounts   and   commissions   incurred   in   connection   with
registrations,  filings or  qualifications  pursuant to Section  1.2,  including
(without limitation) all registration,  filing and qualification fees, printers'
and accounting fees, fees and disbursements of counsel for the Company,  and the
reasonable fees and  disbursements  of one counsel for the selling Holders shall
be borne by the  Company;  provided,  however,  that the  Company  shall  not be
required to pay for any expenses of any  registration  proceeding begun pursuant
to Section 1.2 if the  registration  request is  subsequently  withdrawn  at the
request  of the  Holders  of a  majority  of the  Registrable  Securities  to be
registered (in which case all  participating  Holders shall bear such expenses),
unless the Holders of a majority of the Registrable  Securities agree to forfeit
their  right to one  demand  registration  pursuant  to  Section  1.2;  provided
further,  however,  that if at the time of such  withdrawal,  the  Holders  have
learned of a material adverse change in the condition, business, or prospects of
the Company from that known to the Holders at the time of their request and have
withdrawn the request with  reasonable  promptness  following  disclosure by the
Company of such material adverse change,  then the Holders shall not be required
to pay any of such  expenses and shall  retain their rights  pursuant to Section
1.2.

                   1.7 Expenses of Company Registration.  The Company shall bear
and pay all expenses  incurred in connection  with any  registration,  filing or
qualification  of  Registrable  Securities  with  respect  to the  registrations
pursuant to Section 1.3 for each  Holder,  including  (without  limitation)  all
registration,  filing,  and  qualification  fees,  printers and accounting  fees
relating or apportionable  thereto and the reasonable fees and  disbursements of
one counsel for the selling Holders,  but excluding  underwriting  discounts and
commissions relating to Registrable Securities.


                                       6.




                  1.8 Underwriting Requirements. In connection with any offering
involving an underwriting of shares of the Company's  capital stock, the Company
shall  not be  required  under  Section  1.3  to  include  any  of the  Holders'
securities in such underwriting unless they accept the terms of the underwriting
as agreed upon  between the Company and the  underwriters  selected by it (or by
other  persons  entitled  to  select  the  underwriters),  and then only in such
quantity  as the  underwriters  determine  in  their  sole  discretion  will not
jeopardize  the success of the offering by the  Company.  If the total amount of
securities,  including Registrable  Securities,  requested by stockholders to be
included in such offering  exceeds the amount of  securities  sold other than by
the  Company  that the  underwriters  determine  in  their  sole  discretion  is
compatible with the success of the offering,  then the Company shall be required
to  include  in the  offering  only that  number of such  securities,  including
Registrable   Securities,   which  the  underwriters  determine  in  their  sole
discretion  will not jeopardize  the success of the offering (the  securities so
included to be apportioned pro rata (as nearly as practicable) among the selling
stockholders according to the total amount of securities entitled to be included
therein owned by each selling  stockholder or in such other proportions as shall
mutually be agreed to by such  selling  stockholders)  but in no event shall (i)
the amount of  securities  of the selling  Holders  included in the  offering be
reduced below thirty percent (30%) of the total amount of securities included in
such  offering,  unless  such  offering is the  initial  public  offering of the
Company's  securities in which case the selling  stockholders may be excluded if
the  underwriters   make  the   determination   described  above  and  no  other
stockholder's  securities are included or (ii)  notwithstanding  (i) above,  any
shares  being  sold by a  stockholder  exercising  a demand  registration  right
similar to that  granted in Section  1.2 be  excluded  from such  offering.  For
purposes  of the  preceding  parenthetical  concerning  apportionment,  for  any
selling  stockholder which is a holder of Registrable  Securities and which is a
partnership or corporation,  the partners,  retired partners and stockholders of
such holder,  or the estates and family members of any such partners and retired
partners and any trusts for the benefit of any of the foregoing persons shall be
deemed to be a single  "selling  stockholder,"  and any pro rata  reduction with
respect to such "selling  stockholder"  shall be based upon the aggregate amount
of shares  carrying  registration  rights owned by all entities and  individuals
included in such "selling stockholder," as defined in this sentence.

                  1.9 Delay of  Registration.  No Holder shall have any right to
obtain  or seek  an  injunction  restraining  or  otherwise  delaying  any  such
registration as the result of any  controversy  that might arise with respect to
the interpretation or implementation of this Section 1.

                  1.10 Indemnification.  In the event any Registrable Securities
are included in a registration statement under this Section 1:

                  (a) To the extent permitted by law, the Company will indemnify
and hold harmless each Holder, any partner or former partner of a Holder that is
a  partnership,  any  shareholder  or former  shareholder  of a Holder that is a
corporation, any


                                       7.





underwriter (as defined in the Act) for such Holder and each person, if any, who
controls  such Holder or  underwriter  within the meaning of the Act or the 1934
Act, against any losses,  claims,  damages, or liabilities (joint or several) to
which they may become  subject  under the Act, or the 1934 Act,  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  (collectively,  a "Violation"):  (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 Act,  the 1934 Act,  or any rule or  regulation
promulgated  under the Act, or the 1934 Act;  and the  Company  will pay to each
such Holder,  underwriter or controlling person, as incurred, any legal or other
expenses  reasonably  incurred  by  them in  connection  with  investigating  or
defending any such loss, claim, damage, liability, or action; provided, however,
that the  indemnity  agreement  contained in this  subsection  1.10(a) 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),  nor shall the Company be
liable in any such case to a Holder,  underwriter or controlling  person 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 such Holder, underwriter or controlling person.

                  (b) To the extent  permitted by law, each selling  Holder will
indemnify  and hold  harmless the Company,  each of its  directors,  each of its
officers who has signed the  registration  statement,  each person,  if any, who
controls the Company within the meaning of the Act, any  underwriter,  any other
Holder selling  securities in such  registration  statement and any  controlling
person of any such  underwriter  or other  Holder,  against any losses,  claims,
damages, or liabilities (joint or several) to which any of the foregoing persons
may become  subject,  under the Act,  or the 1934 Act,  insofar as such  losses,
claims,  damages, or liabilities (or actions in respect thereto) arise out of or
are  based  upon any  Violation,  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 such Holder  expressly  for use in connection
with such registration; and each such Holder will pay, as incurred, any legal or
other  expenses  reasonably  incurred by any person  intended to be  indemnified
pursuant  to this  subsection  1.10(b),  in  connection  with  investigating  or
defending any such loss, claim, damage, liability, or action; provided, however,
that the  indemnity  agreement  contained in this  subsection  1.10(b) 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 Holder,
which consent shall not be unreasonably  withheld;  provided  further that in no
event shall any Holder's  cumulative,  aggregate liability under this subsection
1.10(b), or under subsection 1.10(d), or under


                                       8.




such subsections together,  exceed the gross proceeds from the offering received
by such Holder.

                  (c) Promptly after receipt by an indemnified  party under this
Section  1.10  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 any indemnifying party under this Section 1.10, deliver to
the  indemnifying  party a written  notice of the  commencement  thereof and the
indemnifying  party shall have the right to  participate  in, and, to the extent
the indemnifying  party so desires,  jointly with any other  indemnifying  party
similarly  noticed,   to  assume  the  defense  thereof  with  counsel  mutually
satisfactory  to the  parties;  provided,  however,  that an  indemnified  party
(together with all other  indemnified  parties which may be represented  without
conflict by one counsel)  shall have the right to retain one  separate  counsel,
with  the  fees  and  expenses  to  be  paid  by  the  indemnifying   party,  if
representation  of  such  indemnified  party  by  the  counsel  retained  by the
indemnifying  party would be inappropriate due to actual or potential  differing
interests between such indemnified party and any other party represented by such
counsel  in such  proceeding.  The  failure  to  deliver  written  notice to the
indemnifying  party within a  reasonable  time of the  commencement  of any such
action,  if materially  prejudicial to its ability to defend such action,  shall
relieve such indemnifying  party of any liability to the indemnified party under
this  Section  1.10,  but the  omission  so to  deliver  written  notice  to the
indemnifying  party  will  relieve it of any  liability  that it may have to any
indemnified party otherwise than under this Section 1.10.

                  (d) If the  indemnification  provided for in this Section 1.10
is held by a court of competent jurisdiction to be unavailable to an indemnified
party with respect to any loss, liability, claim, damage, or expense referred to
therein,  then the indemnifying  party, in lieu of indemnifying such indemnified
party  hereunder,  shall  contribute  to the  amount  paid  or  payable  by such
indemnified party as a result of such loss, liability, claim, damage, or expense
in such  proportion  as is  appropriate  to reflect  the  relative  fault of the
indemnifying  party on the one hand and of the indemnified party on the other in
connection  with  the  statements  or  omissions  that  resulted  in such  loss,
liability,  claim,  damage,  or expense as well as any other relevant  equitable
considerations.  The  relative  fault  of  the  indemnifying  party  and  of the
indemnifying  party shall be  determined  by reference  to, among other  things,
whether  the  untrue or  alleged  untrue  statement  of a  material  fact or the
omission  to state a  material  fact  relates  to  information  supplied  by the
indemnifying party or by the indemnified party and the parties' relative intent,
knowledge,  access to  information,  and  opportunity to correct or prevent such
statement or omission;  provided,  however,  that in no event shall any Holder's
cumulative,   aggregate  liability  under  this  subsection  1.10(d),  or  under
subsection  1.10(b),  or under  such  subsections  together,  exceed  the  gross
proceeds from the offering received by such Holder.  Notwithstanding anything to
the  contrary  herein,  no party  shall be liable  for  contribution  under this
subsection  1.10(d),  except to the extent and under the  circumstances  as such
party would have been liable to indemnity under subsection


                                       9.




1.10(a) or subsection 1.10(b), as the case may be, if such  indemnification were
enforceable under applicable law.

                  (e)  Notwithstanding  the  foregoing,  to the extent  that the
provisions on  indemnification  and  contribution  contained in the underwriting
agreement  entered into in connection with the underwritten  public offering are
in conflict with the foregoing  provisions,  the provisions in the  underwriting
agreement  shall control with respect to the rights and  obligations  of each of
the parties to such underwriting agreement.

                  (f) The  obligations  of the Company  and  Holders  under this
Section  1.10 shall  survive  the  completion  of any  offering  of  Registrable
Securities in a registration statement under this Section 1, and otherwise.

                  1.11 Reports  Under  Securities  Exchange Act of 1934.  With a
view to making  available  to the Holders the  benefits of Rule 144  promulgated
under the Act and any other rule or  regulation  of the SEC that may at any time
permit  a  Holder  to sell  securities  of the  Company  to the  public  without
registration or pursuant to a registration on Form S-3, the Company agrees to:

                  (a) make and keep public information available, as those terms
are  understood and defined in SEC Rule 144, at all times after ninety (90) days
after  the  effective  date of the  first  registration  statement  filed by the
Company for the offering of its securities to the general public;

                  (b) take such action,  including the voluntary registration of
its Common Stock under Section 12 of the 1934 Act, as is necessary to enable the
Holders to utilize Form S-3 for the resale of their Registrable Securities, such
action to be taken as soon as  practicable  after the end of the fiscal  year in
which the first registration  statement filed by the Company for the offering of
its securities to the general public is declared effective;

                  (c) file with the SEC in a timely manner all reports and other
documents required of the Company under the Act and the 1934 Act; and

                  (d)  furnish to any  Holder,  so long as the  Holder  owns any
Registrable  Securities,  forthwith upon request (i) a written  statement by the
Company that it has complied with the reporting requirements of SEC Rule 144 (at
any  time  after  ninety  (90)  days  after  the  effective  date  of the  first
registration  statement filed by the Company),  the Act and the 1934 ACT (at any
time after it has become  subject to such  reporting  requirements),  or that it
qualifies as a registrant  whose  securities may be resold  pursuant to Form S-3
(at any time after it so  qualifies),  (ii) a copy of the most recent  annual or
quarterly report of the Company and such other reports and documents so filed by
the Company,  and (iii) such other information as may be reasonably requested in
availing


                                       10.





any Holder of any rule or regulation of the SEC which permits the selling of any
such securities without registration or pursuant to such form.

                  1.12 Form S-3 Registration.  In case the Company shall receive
a written  request or requests from Holders of at least twenty  percent (20%) of
the Registrable Securities outstanding that the Company effect a registration on
Form S-3 and any related  qualification  or compliance  with respect to all or a
part of the Registrable  Securities owned by such Holder or Holders, the Company
will:

                  (a) promptly give written notice of the proposed registration,
and any related qualification or compliance, to all other Holders; and

                  (b) as soon as practicable,  effect such  registration and all
such  qualifications  and compliances as may be so requested and as would permit
or facilitate the sale and  distribution of all or such portion of such Holder's
or Holders'  Registrable  Securities as are specified in such request,  together
with all or such portion of the  Registrable  Securities  of any other Holder or
Holders  joining in such  request as are  specified in a written  request  given
within  fifteen (15) days after receipt of such written notice from the Company;
provided,  however,  that the Company  shall not be obligated to effect any such
registration, qualification or compliance, pursuant to this section 1.12: (i) if
Form S-3 is not available for such offering by the Holders; (ii) if the Holders,
together  with the holders of any other  securities  of the Company  entitled to
inclusion in such registration,  propose to sell Registrable Securities and such
other  securities  (if  any) at an  aggregate  price to the  public  (net of any
underwriters'  discounts or  commissions)  of less than  $500,000;  (iii) if the
Company shall  furnish to the Holders a  certificate  signed by the President of
the Company stating that in the good faith judgment of the Board of Directors of
the  Company,  it  would  be  materially  detrimental  to the  Company  and  its
stockholders  for such Form S-3  registration  statement  to be effected at such
time, in which event the Company shall have the right to defer the filing of the
Form S-3  registration  statement  for a period of not more than sixty (60) days
after  receipt of the request of the Holder or Holders  under this Section 1.12;
provided,  however, that the Company shall not utilize this right more than once
in any twelve  month  period;  (iv) if the Company  has,  within the twelve (12)
month  period  preceding  the  date  of  such  request,   already  effected  two
registrations  on Form S-3 for the Holders pursuant to this Section 1.12; or (v)
in any particular jurisdiction in which the Company would be required to qualify
to do  business  or to  execute a general  consent  to  service  of  process  in
effecting such registration, qualification or compliance.

                  (c)  Subject  to  the  foregoing,  the  Company  shall  file a
registration  statement covering the Registrable Securities and other securities
so  requested  to be  registered  as soon as  practicable  after  receipt of the
request or  requests  of the  Holders.  All  expenses  other  than  underwriting
discounts and commissions  incurred in connection with a registration  requested
pursuant to Section  1.12,  including  (without  limitation)  all  registration,
filing,  qualification,  printer's and accounting  fees and the reasonable  fees


                                      11. 




and  disbursements  of one counsel for the selling  Holder or Holders,  shall be
paid by the Company.  Registrations effected pursuant to this Section 1.12 shall
not be counted as demands for registration or registrations effected pursuant to
Section 1.2.

                  1.13  Assignment of Registration  Rights.  The rights to cause
the Company to register Registrable Securities pursuant to this Section 1 may be
assigned (but only with all related  obligations) by a Holder to a transferee or
assignee of such  securities  who, after such  assignment or transfer,  holds at
least 99,000 shares of Registrable Securities (subject to appropriate adjustment
for stock splits,  stock dividends,  combinations and other  recapitalizations),
provided:  (a) the Company is,  within a  reasonable  time after such  transfer,
furnished  with  written  notice of the name and address of such  transferee  or
assignee and the Registrable  Securities with respect to which such registration
rights are being assigned;  (b) such transferee or assignee agrees in writing to
be bound by and subject to the terms and conditions of this Agreement, including
without limitation the provisions of Section 1.15 below; and (c) such assignment
shall be  effective  only if  immediately  following  such  transfer the further
disposition  of such  Registrable  Securities  by the  transferee or assignee is
restricted  under the Act. For the purposes of determining  the number of shares
of  Registrable  Securities  held by a transferee  or assignee,  the holdings of
transferees and assignees of a partnership who are partners or retired  partners
of such partnership  (including  spouses and ancestors,  lineal  descendants and
siblings of such partners or spouses who acquire Registrable Securities by gift,
will or  intestate  succession)  shall  be  aggregated  together  and  with  the
partnership,  and the holdings of transferees and assignees who are "affiliates"
(as defined in SEC Rule 405) of a Holder shall be aggregated  together with such
Holder;  provided,  that all  assignees  and  transferees  who would not qualify
individually  for  assignment  of  registration   rights  shall  have  a  single
attorney-in-fact for the purpose of exercising any rights,  receiving notices or
taking any action under this Section 1.

                  1.14 Limitations on Subsequent  Registration  Rights. From and
after the date of this  Agreement,  the  Company  shall not,  without  the prior
written  consent of the  Holders of a majority  of the  outstanding  Registrable
Securities,  enter into any agreement with any holder or  prospective  holder of
any  securities  of the Company  which  would  allow such holder or  prospective
holder (a) to include such  securities in any  registration  filed under Section
1.2 or Section 1.3 hereof, unless under the terms of such agreement, such holder
or prospective  holder may include such securities in any such registration only
to the extent that the inclusion of his securities will not reduce the amount of
the  Registrable  Securities  of the Holders  which is included or (b) to make a
demand  registration  which could result in such  registration  statement  being
declared  effective  prior to the  earlier  of  either of the dates set forth in
subsection  1.2(a) or within one hundred twenty (120) days of the effective date
of any registration  effected pursuant to Section 1.2. Each of the Investors (i)
acknowledges  that the Company has granted  registration  and related  rights to
certain  individuals and entities pursuant to the terms of a certain Amended and
Restated  Investors'  Rights  Agreement  dated  April  17,  1996,  and a certain
Investors' Rights Agreement dated May 21, 1996 (the "Subordinate Rights


                                       12.




Agreements"),  (ii)  acknowledges  that it has had the opportunity to review the
Subordinate  Rights  Agreements  and  (iii)  consents  to the  execution  of the
Subordinate  Rights  Agreements  by the  Company  and the  grant  of the  rights
contained therein.

                  1.15 "Market Stand-Off" Agreement. Each Investor hereby agrees
that, during the period of duration  specified by the Company and an underwriter
of Common Stock or other securities of the Company  following the effective date
of a registration statement of the Company filed under the Act, it shall not, to
the extent requested by the Company and such underwriter, directly or indirectly
sell, offer to sell, contract to sell (including,  without limitation, any short
sale),  grant any option to purchase or otherwise  transfer or dispose of (other
than to donees who agree to be similarly  bound) any  securities  of the Company
held by it at any time during such period except  Common Stock  included in such
registration; provided, however, that:

                  (a) Such  agreement  shall not exceed one hundred eighty (180)
days for the first such  registration  statement  of the  Company  which  covers
Common Stock (or other  securities) to be sold on its behalf to the public in an
underwritten offering;

                  (b) Such  agreement  shall not exceed ninety (90) days for any
subsequent  registration  statement of the Company which covers Common Stock (or
other  securities)  to be sold on its  behalf to the  public in an  underwritten
offering; and

                  (c) An Investor shall not be subject to such agreement  unless
all  executive  officers  and  directors  of  the  Company  enter  into  similar
agreements and all other Investors and holders of other registration  rights are
subject to or obligated to enter into similar agreements.

                  In order to enforce the foregoing  covenants,  the Company may
impose stop-transfer  instructions with respect to the Registrable Securities of
each Investor (and the shares or securities of every other person subject to the
foregoing  restriction)  until  the  end of such  period.

                  1.16 Termination of Registration Rights.

                  (a) No Holder shall be entitled to exercise any right provided
for in this  Section 1 after the  earlier  of (i) five (5) years  following  the
consummation  of the sale of  securities  pursuant to a  registration  statement
filed  by the  Company  under  the  Act in  connection  with  the  initial  firm
commitment  underwritten  offering of its securities to the general  public,  or
(ii) such time as the Holder can sell all of such  stock  under Rule  144(k) (or
successor rule) promulgated by the SEC.


                                       13.



                  2. Covenants of the Company.

                  2.1  Delivery  of  Financial  Statements.  The  Company  shall
deliver:

                  (a) to each Investor as soon as practicable,  but in any event
within  ninety (90) days after the end of each fiscal  year of the  Company,  an
income  statement  for such  fiscal  year,  a balance  sheet of the  Company and
statement of stockholder's  equity as of the end of such year, and a schedule as
to the sources and applications of funds for such year, such year-end  financial
reports to be in  reasonable  detail,  prepared  in  accordance  with  generally
accepted  accounting   principles   ("GAAP"),   and  audited  and  certified  by
independent public accountants of nationally recognized standing selected by the
Company;

                  (b) to each Investor  holding at least 99,000 shares of Series
A Preferred  Stock and/or Series B Preferred  Stock  (together,  the  "Preferred
Stock")  (subject to appropriate  adjustment for stock splits,  stock dividends,
combinations  and other  recapitalizations)  (each such Investor  being a "Major
Investor" for purposes of Sections 2.1, 2.2 and 2.3) as soon as practicable, but
in any event  within  forty-five  (45)  days  after the end of each of the first
three (3)  quarters of each fiscal year of the Company,  an unaudited  profit or
loss  statement,  schedule as to the sources and  application  of funds for such
fiscal  quarter  and an  unaudited  balance  sheet as of the end of such  fiscal
quarter;

                  (c) to each Major Investor  within thirty (30) days of the end
of each month, an unaudited  income statement and schedule as to the sources and
application  of funds and balance sheet for and as of the end of such month,  in
reasonable detail;

                  (d) to each Major Investor as soon as practicable,  but in any
event  thirty  (30) days  prior to the end of each  fiscal  year,  a budget  and
business plan for the next fiscal year,  prepared on a monthly basis,  including
balance sheets and sources and  applications of funds statements for such months
and, as soon as prepared,  any other budgets or revised budgets  prepared by the
Company.

                  2.2 Inspection.  The Company shall permit each Major Investor,
at such Major Investor's expense, to visit and inspect the Company's properties,
to examine  its books of  account  and  records  and to  discuss  the  Company's
affairs,  finances and accounts with its officers,  all at such reasonable times
as may be requested by the Major Investor;  provided,  however, that the Company
shall not be  obligated  pursuant to this  Section 2.2 to provide  access to any
information  which it  reasonably  considers  to be a trade  secret  or  similar
confidential information.

                  2.3  Termination  of  Information  Inspection  and First Offer
Covenants.  Subject to their earlier termination  pursuant to the specific terms
of each  Section,  the  covenants  set forth in Sections  2.1, 2.2 and 2.4 shall
terminate as to Investors and Major


                                      14.




Investors  and be of no  further  force or  effect  when the sale of  securities
pursuant  to a  registration  statement  filed by the  Company  under the Act in
connection with the firm commitment  underwritten  offering of its securities to
the general public is  consummated or when the Company first becomes  subject to
the periodic reporting  requirements of Sections 12(g) or 15(d) of the 1934 Act,
whichever event shall first occur.

                  2.4 Right of First Offer.  Subject to the terms and conditions
specified  in this  paragraph  2.4,  the  Company  hereby  grants to each  Major
Investor (as hereinafter  defined) a right of first offer with respect to future
sales by the Company of its Shares (as  hereinafter  defined).  For  purposes of
this  Section 2.4, a Major  Investor  shall mean any Investor who holds at least
99,000 shares of Registrable  Securities (subject to appropriate  adjustment for
stock splits, stock dividends,  combinations and other  recapitalizations).  For
purposes of this Section 2.4,  Investor  includes any partners and affiliates of
an Investor. An Investor shall be entitled to apportion the right of first offer
hereby  granted  it  among  itself  and  its  partners  and  affiliates  in such
proportions as it deems appropriate.

                  Each time the  Company  proposes  to offer any  shares  of, or
securities  convertible  into or exercisable for any shares of, any class of its
capital  stock  ("Shares"),  the  Company  shall  first make an offering of such
Shares to each Major Investor in accordance with the following provisions:

                  (a)  The  Company  shall   deliver  a  notice   ("Notice")  in
accordance  with  Section 3.5 to the Major  Investors  stating (i) its bona fide
intention  to offer such  Shares,  (ii) the number of such Shares to be offered,
and (iii) the price and  terms,  if any,  upon which it  proposes  to offer such
Shares.

                  (b) Within  twenty  (20)  calendar  days after  receipt of the
Notice,  the Major Investor may elect to purchase or obtain, at the price and on
the terms  specified  in the Notice,  up to that  portion of such  Shares  which
equals the proportion that the number of shares of Common Stock issued and held,
or issuable upon conversion of Preferred Stock then held, by such Major Investor
bears to the  total  number  of  shares  of  Common  Stock of the  Company  then
outstanding  (assuming  full  conversion  of all  convertible  securities).  The
Company shall promptly,  in writing,  inform each Major Investor which purchases
all the shares available to it ("Fully-Exercising  Major Investor") of any other
Major Investor's  failure to do likewise.  During the ten-day period  commencing
after receipt of such information, each Fully-Exercising Major Investor shall be
entitled to obtain that  portion of the Shares for which  Major  Investors  were
entitled to subscribe but which were not subscribed  for by the Major  Investors
which is equal to the  proportion  that the  number of  shares  of Common  Stock
issued and held,  or issuable upon  conversion of Preferred  Stock then held, by
such  Fully-Exercising  Major  Investor  bears to the total  number of shares of
Common Stock issued and held, or issuable upon conversion of the Preferred Stock
then held, by all Fully-Exercising  Major Investors who wish to purchase some of
the unsubscribed shares.


                                      15.




                  (c) If all Shares which Major Investors are entitled to obtain
pursuant  to  subsection  2.4(b) are not  elected to be  obtained as provided in
subsection  2.4(b) hereof,  the Company may, during the 60-day period  following
the expiration of the period  provided in subsection  2.4(b)  hereof,  offer the
remaining  unsubscribed  portion  of such  Shares to any  person or persons at a
price not less than,  and upon terms no more  favorable to the person or persons
than  those  specified  in the  Notice.  If the  Company  does not enter into an
agreement for the sale of the Shares within such period, or if such agreement is
not  consummated  within 30 days of the execution  thereof,  the right  provided
hereunder  shall be deemed to be revived  and such  Shares  shall not be offered
unless first reoffered to the Major Investors in accordance herewith.

                  (d) The right of first offer in this  Section 2.4 shall not be
applicable  (i) to the  issuance  or sale of no more  than  1,500,000  shares of
Common  Stock (or options  therefor)  to  employees,  consultants,  directors or
officers  of the  Company  (and  not  repurchased  at  cost  by the  Company  in
connection  with  the   termination  of  employment  or  service   relationship)
subsequent  to the date of this  Agreement,  (ii) to the  issuance or sale of no
more than  1,000,000  shares of Common  Stock  (or  options  therefor)  to third
parties in connection  with the license of rights by the Company from such third
parties subsequent to the date of this Agreement, (iii) to or after consummation
of a bona fide, firmly  underwritten  public offering of shares of Common Stock,
registered  under the Act  pursuant to a  registration  statement on Form S-1 or
similar  successor  form,  (iv) to the  issuance of  securities  pursuant to the
conversion or exercise of  convertible  or  exercisable  securities,  (v) to the
issuance of securities in connection with a bona fide business acquisition of or
by the  Company,  whether by  merger,  consolidation,  sale of  assets,  sale or
exchange of stock or  otherwise  or (vi) to the  issuance of stock,  warrants or
other  securities or rights to persons or entities with which the Company has or
is establishing  business  relationships,  provided such issuances are for other
than primarily equity financing purposes.

                  (e) The right of first offer set forth in this Section 2.4 may
not be assigned or transferred, except that (i) such right is assignable by each
Major  Investor  to  any  wholly-owned  subsidiary  or  parent  of,  or  to  any
corporation  or entity  that is,  within the  meaning  of the Act,  controlling,
controlled by or under common  control with,  any such Major  Investor or to any
partner or  shareholder  of such Major  Investor,  provided that such partner or
shareholder  holds at least 99,000 shares of Registrable  Securities at the time
of or immediately  after such assignment,  (ii) such right is assignable by each
Major Investor that is a trust to any successor  trustee of such trust, and (ii)
such right is assignable between and among any of the Major Investors.

                  2.5  Key-Person  Insurance.  The  Company  has as of the  date
hereof or shall within  ninety (90) days of the date hereof use its best efforts
to obtain from financially  sound and reputable  insurers term life insurance on
the life of Dr. David Barry in the amount of  $10,000,000  (subject to review by
the Company's board of 


                                      16.




directors  based upon the amount of the premium)  with  proceeds  payable to the
Company.

                  2.6  Indemnification.  The  Company  shall  take  all  actions
necessary  to  indemnify  its  directors  to the  maximum  extent  permitted  by
applicable  law,   including,   without   limitation,   amending  the  Company's
Certificate  of  Incorporation  and Bylaws and entering into  contracts with the
directors to provide such indemnification;  provided,  however, that the Company
shall not be required to obtain directors insurance unless directed by the Board
of Directors.

                  3. Miscellaneous.

                  3.1  Successors  and  Assigns.  Except as  otherwise  provided
herein, the terms and conditions of this Agreement shall inure to the benefit of
and be  binding  upon the  respective  successors  and  assigns  of the  parties
(including transferees of any shares of Registrable Securities). Nothing in this
Agreement,  express or implied,  is intended to confer upon any party other than
the  parties  hereto or their  respective  successors  and  assigns  any rights,
remedies,  obligations,  or  liabilities  under or by reason of this  Agreement,
except as expressly provided in this Agreement.

                  3.2  Governing  Law. This  Agreement  shall be governed by and
construed under the laws of the State of Delaware as applied to agreements among
Delaware residents entered into and to be performed entirely within Delaware.

                  3.3  Counterparts.  This  Agreement  may be executed in one or
more counterparts,  each of which shall be deemed an original,  but all of which
together shall constitute one and the same instrument.

                  3.4 Titles and  Subtitles.  The titles and  subtitles  used in
this  Agreement  are used for  convenience  only and are not to be considered in
construing or interpreting this Agreement.

                  3.5 Notices. Unless otherwise provided, any notice required or
permitted under this Agreement  shall be sent to the address  indicated for such
party on the  signature  page  hereof  (provided  that any party at any time may
change  its  address  by ten (10)  days'  advance  written  notice  to the other
parties),  and shall be deemed  effectively  given upon (i) personal delivery to
the party to be notified,  (ii) the time of successful facsimile transmission to
the party to be notified, (iii) sending by reputable overnight delivery service,
or (iv) upon  deposit  with the United  States Post  Office,  by  registered  or
certified mail, postage prepaid.

                  3.6  Expenses.  If any action at law or in equity is necessary
to enforce or interpret the terms of this Agreement,  the prevailing party shall
be entitled to


                                       17.





reasonable attorneys' fees, costs and necessary disbursements in addition to any
other relief to which such party may be entitled.

                  3.7 Amendments and Waivers.  Any term of this Agreement may be
amended and the  observance of any term of this  Agreement may be waived (either
generally   or  in  a   particular   instance   and  either   retroactively   or
prospectively), only with the written consent of the Company and (i) the holders
of a majority of the Common Stock then issuable or issued upon conversion of the
Series A  Preferred  Stock and any  Common  Stock of the  Company  issued as (or
issuable upon the conversion or exercise of any warrant, right or other security
which is issued as) a dividend  or other  distribution  with  respect  to, or in
exchange  for or in  replacement  of such  shares of  Common  Stock and (ii) the
holders  of a  majority  of the  Common  Stock  then  issuable  or  issued  upon
conversion  of the Series B Preferred  Stock and any Common Stock of the Company
issued as (or issuable upon the conversion or exercise of any warrant,  right or
other security which is issued as) a dividend or other distribution with respect
to, or in exchange for or in  replacement  of such shares of Common  Stock.  Any
amendment or waiver  effected in accordance with this paragraph shall be binding
upon each holder of any  Registrable  Securities then  outstanding,  each future
holder of all such Registrable Securities, and the Company.

                  3.8 Additional Investors.  After obtaining the written consent
of the Company, any individuals and/or entities that hold or purchase any shares
of the  Preferred  Stock of the  Company  shall be entitled to become a party to
this Agreement,  and the addition of such individuals and/or entities as parties
to this  Agreement  and any  required  amendment  of  Schedule  A in  connection
therewith  shall not be considered an amendment of this Agreement  requiring the
consent of the Investors. Upon execution of a counterpart signature page to this
Agreement  by the  Company and any of such  individuals  and/or  entities,  such
individuals  and/or  entities shall become parties to this Agreement to the same
extent as if they had executed this Agreement as of the date hereof and shall be
included in the definition of "Investor"  under this Agreement for all purposes.
Schedule A to this Agreement  shall be  automatically  amended as appropriate to
reflect the addition of such individuals and/or entities as Investors under this
Agreement.   The   definition  of   "Registrable   Securities"   shall  also  be
automatically  amended  to  include  the shares of Common  Stock  issuable  upon
conversion of the Preferred  Stock issued to such  individuals  and/or  entities
without the need to obtain the consent or signature of the Investors.

                  3.9 Severability.  If one or more provisions of this Agreement
are held to be  unenforceable  under  applicable  law, such  provision  shall be
excluded  from  this  Agreement  and  the  balance  of the  Agreement  shall  be
interpreted  as if such  provision  were so excluded and shall be enforceable in
accordance with its terms.


                                       18.





                  3.10   Aggregation   of  Stock.   All  shares  of  Registrable
Securities  held  or  acquired  by  affiliated  entities  or  persons  shall  be
aggregated  together  for the purpose of  determining  the  availability  of any
rights under this Agreement.

                  3.11 Entire Agreement.  This Agreement (including the Exhibits
hereto) constitutes the full and entire  understanding and agreement between the
parties with regard to the subject hereof.

                  3.12  Representation.   By  executing  this  Agreement,   each
Investor acknowledges and agrees that Brobeck, Phleger & Harrison represents the
Company  solely  and that such  Investor  has been  advised  to,  and has had an
opportunity to, consult with its own attorney in connection with this Agreement.

                  3.13 Board Representation.

                  (a) The  Investors  that own Series A  Preferred  Stock of the
Company agree that they shall  cooperate and use their best efforts,  including,
without  limitation,  voting  their  shares of Series A  Preferred  Stock of the
Company (but not voting their shares of Common Stock or any other  securities of
the Company held by them other than shares of Series A Preferred  Stock owned by
them) so that

                           (i) One member of the  Company's  Board of  Directors
shall be a person designated from time to time by a majority in interest held by
Venrock  Associates and Venrock  Associates II, L.P.; and 

                           (ii) One member of the  Company's  Board of Directors
shall be a person designated from time to time by a majority in interest held by
Forward Ventures II, L.P. and Forward Ventures Vanguard Fund.

                  (b) The  Investors  that own Series B  Preferred  Stock of the
Company as of the  closing  agree that they shall  cooperate  and use their best
efforts,  including,  without  limitation,  voting  their  shares  of  Series  B
Preferred  Stock of the Company  (but not voting their shares of Common Stock or
any other  securities  of the Company held by them other than shares of Series B
Preferred Stock owned by them) so that

                           (i) One member of the  Company's  Board of  Directors
shall be a person  designated from time to time by The Wellcome Trust Limited as
trustee of The Wellcome Trust; and

                           (ii) One member of the  Company's  Board of Directors
shall be a person designated from time to time by a majority in interest held by
George  McFadden,  John H. McFadden,  Carol  McFadden,  Lesley Taylor,  George &
Lesley  Taylor  McFadden  Trustees,  U/A DTD  9/22/71  F/B/O  Elizabeth  Cutting
McFadden Trust, Alexander B.


                                       19.



McFadden deceased, Mellon Bank N.A., Alexander Cushing & George McFadden U/W and
McFadden Brothers.

                  The  cooperation  and use of  best  efforts  required  of each
Investor  pursuant  to  subitems  (a)  and  (b)  above  shall  include,  without
limitation, the voting of each Investor's Series A Preferred Stock and/or Series
B Preferred  Stock,  as the case may be, to remove the  designee of the party or
parties  that  designated  such  person if  requested  to do so by such party or
parties.  The right of any of the  entities  identified  in subitems  (a) or (b)
above to designate a member to the Company's  Board of Directors and, as to that
Board position, the obligations of the Investors to vote for a person designated
by such entities, shall cease forever when the total number of shares of "Stock"
(as  defined  below)  collectively  held by the  parties  identified  in subitem
(a)(i),  or collectively held by the parties  identified in subitem (a)(ii),  or
held by the party  identified in subitem  (b)(i),  or  collectively  held by the
parties  identified in subitem (b)(ii),  as the case may be, becomes at any time
less than  five  hundred  thousand  (500,000)  shares  (subject  to  appropriate
adjustment  for  stock  splits,   stock   dividends,   combinations   and  other
recapitalizations).  The term  "Stock"  shall mean the shares of Common Stock of
the  Company  issued  and/or  issuable  upon the  conversion  or exchange of any
outstanding convertible or exchangeable securities of the Company. Investors are
subject  to the  terms of this  Section  3.13 only to the  extent  that they own
Series A Preferred  Stock and/or  Series B Preferred  Stock of the Company,  and
shall be free to vote any other  voting  securities  of the Company held by them
unencumbered by the terms of this Section 3.13. Subitem (a) of this Section 3.13
and all obligations  under subitem (a) of this Section 3.13 shall  automatically
terminate forever if and when the number of directors that the holders of Series
A  Preferred  Stock are  entitled to elect under the  Company's  Certificate  of
Incorporation  (as it may be amended) is less than two (2).  Subitem (b) of this
Section 3.13 and all  obligations  under  subitem (b) of this Section 3.13 shall
automatically  terminate  forever if and when the number of  directors  that the
holders of Series B Preferred  Stock are  entitled to elect under the  Company's
Certificate of Incorporation (as it may be amended) is less than two (2).

                  3.14   Restatement   of  Prior   Agreement.   This   Agreement
constitutes  a  restatement  in its  entirety of the Prior  Agreement.  Upon the
effectiveness of this Agreement,  the Prior Agreement shall be terminated and of
no further force or effect,  and neither the Company nor any other party to such
Prior  Agreement  shall have any further rights or obligations  under such Prior
Agreement.


                [REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]



                                       20.






                  IN WITNESS  WHEREOF,  the parties have executed this Agreement
as of the date first above written.

                                         THE COMPANY: 

                                         TRIANGLE PHARMACEUTICALS, INC.


                                         By: /s/ David Barry
                                         ---------------------------------------
                                            Dr. David Barry, Chairman and Chief
                                            Executive Officer

                                Address: 4 University Place
                                         4611 University Drive
                                         Durham, NC 27707


                                         THE INVESTORS:


                                              /s/ David Barry
                                         ---------------------------------------
                                                  Dr. David Barry

                                Address: 1810 South Lakeshore Drive
                                         Chapel Hill, North Carolina 27514


            [SIGNATURE PAGE TO RESTATED INVESTORS' RIGHTS AGREEMENT]






                  IN WITNESS  WHEREOF,  the parties have executed this Agreement
as of the date first above written.

                                         THE COMPANY: 

                                         TRIANGLE PHARMACEUTICALS, INC.


                                         By: /s/ David Barry
                                         ---------------------------------------
                                            Dr. David Barry, Chairman and Chief
                                            Executive Officer

                                Address: 4 University Place
                                         4611 University Drive
                                         Durham, NC 27707


                                         THE INVESTORS:


                                              /s/ M. Nixon Ellis
                                         ---------------------------------------
                                                  Dr. M. Nixon Ellis


                                Address: 5915 St. Mary's Road
                                         Hillsborough, North Carolina 27278



            [SIGNATURE PAGE TO RESTATED INVESTORS' RIGHTS AGREEMENT]





                  IN WITNESS  WHEREOF,  the parties have executed this Agreement
as of the date first above written.


                                       THE COMPANY:

                                       TRIANGLE PHARMACEUTICALS, INC.


                                       By
                                       ----------------------------------------
                                       Dr. David Barry, Chairman and Chief
                                       Executive Officer

                              Address: 4 University Place
                                       4611 University Drive
                                       Durham, NC 27707


                                       THE INVESTORS: 
                
                                        /s/ Karl Y. Hostetler
                                       -----------------------------------------
                                       Dr. Karl Y. Hostetler, Co-Trustee of the
                                       Hostetler Family Trust UTD March 18, 1992


                                        /s/ Margaretha Hostetler
                                       -----------------------------------------
                                       Margaretha Hostetler, Co-Trustee of the
                                       Hostetler Family Trust UTD March 18, 1992

                              Address: 14024 Rue St. Raphael
                                       Del Mar, California 92014



            [SIGNATURE PAGE TO RESTATED INVESTORS' RIGHTS AGREEMENT]



                  IN WITNESS  WHEREOF,  the parties have executed this Agreement
as of the date first above written.


                                         THE COMPANY:

                                         TRIANGLE PHARMACEUTICALS, INC.  


                                         By:
                                         ---------------------------------------
                                             Dr. David Barry, Chairman and Chief
                                             Executive Officer

                             Address:    4 University Place
                                         4611 University Drive
                                         Durham, NC 27707


                                         THE INVESTORS:

                                         FORWARD VENTURES II, L.P.



                                         By: /s/ Standish M.Fleming
                                         ---------------------------------------
                                            Standish M. Fleming, General Partner

                             Address:    10975 Torreyana Road, Suite 230
                                         San Diego, California 92121




                                         FORWARD VENTURES VANGUARD
                                         FUND

                                         By: Forward III Associates L.L.C.


                                         By: /s/ Standish M. Fleming
                                         ---------------------------------------
                                             Standish M. Fleming, Member
                 
                             Address:    10975 Torreyana Road, Suite 230
                                         San Diego, California 92121



            [SIGNATURE PAGE TO RESTATED INVESTORS' RIGHTS AGREEMENT]





                  IN WITNESS  WHEREOF,  the parties have executed this Agreement
as of the date first above written.


                                         THE COMPANY:

                                         TRIANGLE PHARMACEUTICALS, INC.


                                         By: 
                                         ---------------------------------------
                                            Dr. David Barry, Chairman and Chief
                                            Executive Officer

                               Address:  4 University Place
                                         4611 University Drive
                                         Durham, NC 27707


                                         THE INVESTORS:


                                         /s/ Sandra Lehrman
                                         ---------------------------------------
                                         Sandra Lehrman

                              Address:   60 Watch Hill
                                         East Greenwich, Rhode Island 02818


            [SIGNATURE PAGE TO RESTATED INVESTORS' RIGHTS AGREEMENT






                  IN WITNESS  WHEREOF,  the parties have executed this Agreement
as of the date first above written.

                                         THE COMPANY:


                                         TRIANGLE PHARMACEUTICALS, INC.


                                         By: 
                                         ---------------------------------------
                                            Dr. David Barry, Chairman and Chief 
                                            Executive Officer

                             Address:    4 University Place
                                         4611 University Drive
                                         Durham, NC 27707


                                         THE INVESTORS: 
                                            
                                         GS TRIANGLE HOLDINGS


                                         By:           illegible
                                         ---------------------------------------


                                         Its: Attorney-in-fact
                                         ---------------------------------------
                             Address:    85 Broad Street
                                         New York, New York 10004


            [SIGNATURE PAGE TO RESTATED INVESTORS' RIGHTS AGREEMENT]






                  IN WITNESS  WHEREOF,  the parties have executed this Agreement
as of the date first above written.


                                         THE COMPANY:


                                         TRIANGLE PHARMACEUTICALS, INC.


                                         By:
                                         ---------------------------------------
                                             Dr. David Barry, Chairman and Chief
                                             Executive Officer

                             Address:    4 University Place
                                         4611 University Drive
                                         Durham, NC 27707


                                         THE INVESTORS:

                
                                         /s/ George McFadden
                                         ---------------------------------------
                                         George McFadden

                             Address:    c/o McFadden Brothers
                                         745 Fifth Avenue
                                         New York, New York 10151-0050


                
                                         /s/  John H. McFadden
                                         ---------------------------------------
                                         John H. McFadden
                                         Attorney-in-fact

                             Address:    c/o McFadden Brothers
                                         745 Fifth Avenue
                                         New York, New York 10151-0050


            [SIGNATURE PAGE TO RESTATED INVESTORS' RIGHTS AGREEMENT]








                  IN WITNESS  WHEREOF,  the parties have executed this Agreement
as of the date first above written.


                                         THE COMPANY:

                                         TRIANGLE PHARMACEUTICALS, INC.


                                         By:                                    
                                         ---------------------------------------
                                             Dr. David Barry, Chairman and Chief
                                             Executive Officer

                             Address:    4 University Place
                                         4611 University Drive
                                         Durham, NC 27707


                                         THE INVESTORS:


                                         McFADDEN BROTHERS

              
                                         By:            illegible
                                         ---------------------------------------

                                          
                                         Its: Partner
                                         ---------------------------------------

                             Address:    c/o McFadden Brothers
                                         745 Fifth Avenue
                                         New York, New York 10151-0050



                                         /s/ Lesley Taylor 
                                         ---------------------------------------
                                         Lesley Taylor
                                         Attorney-in-fact

                             Address:    c/o McFadden Brothers
                                         745 Fifth Avenue
                                         New York, New York 10151-0050



            [SIGNATURE PAGE TO RESTATED INVESTORS' RIGHTS AGREEMENT]







                  IN WITNESS  WHEREOF,  the parties have executed this Agreement
as of the date first above written.


                                         THE COMPANY:

                                         TRIANGLE PHARMACEUTICALS, INC.


                                         By:
                                         ---------------------------------------
                                             Dr. David Barry, Chairman and Chief
                                             Executive Officer

                             Address:    4 University Place
                                         4611 University Drive
                                         Durham, NC 27707


                                         THE INVESTORS:

                                         SCHRODER VENTURE MANAGERS
                                         LIMITED, as manager for
                                         Schroder Ventures International Life
                                         Sciences Fund LPI,
                                         Schroder Ventures International Life 
                                         Sciences Fund LP2,
                                         Schroder Ventures International Life
                                         Sciences Fund Trust and
                                         Schroder Venture Managers Inc., as 
                                         investment manager for the Schroder 
                                         Ventures International Life Sciences
                                         Co-investment Scheme



                                         By:           illegible
                                         ---------------------------------------


                                       
                                         Its: Director
                                         ---------------------------------------
                                                 
                             Address:    22 Church Street
                                         Hamilton HM 11, Bermuda



            [SIGNATURE PAGE TO RESTATED INVESTORS' RIGHTS AGREEMENT







                  IN WITNESS  WHEREOF,  the parties have executed this Agreement
as of the date first above written.


                                         THE COMPANY:

                                         TRIANGLE PHARMACEUTICALS, INC.

                                         By:
                                         ---------------------------------------
                                             Dr. David Barry, Chairman and Chief
                                             Executive Officer

                             Address:    4 University Place
                                         4611 University Drive
                                         Durham, NC 27707


                                         THE INVESTORS:

                                         VENROCK ASSOCIATES


                                         By: /s/ Anthony Evnin
                                         ---------------------------------------
                                         Anthony Evnin, General Partner

                             Address:    30 Rockefeller Plaza
                                         New York, NY 10112



                                        VENROCK ASSOCIATES II, L.P.


                                        By: /s/ Anthony Evnin
                                        ----------------------------------------
                                        Anthony Evnin, General Partner

                             Address:   30 Rockefeller Plaza
                                        New York, NY 10112



            [SIGNATURE PAGE TO RESTATED INVESTORS' RIGHTS AGREEMENT]









                  IN WITNESS  WHEREOF,  the parties have executed this Agreement
as of the date first above written.


                                         THE COMPANY:

                                         TRIANGLE PHARMACEUTICALS, INC.

                                         By:
                                         ---------------------------------------
                                             Dr. David Barry, Chairman and Chief
                                             Executive Officer

                             Address:    4 University Place
                                         4611 University Drive
                                         Durham, NC 27707


                                         THE INVESTORS:

                                         THE WELCOMED TRUST LIMITED as
                                         trustee of THE WELCOME TRUST


                                         By: /s/ illegible
                                         ---------------------------------------


                                         Its: Company Secretary
                                         ---------------------------------------
                                        
                             Address:    183 Euston Road
                                         London, England NW1 2BE






            [SIGNATURE PAGE TO RESTATED INVESTORS' RIGHTS AGREEMENT]









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