TRIANGLE PHARMACEUTICALS INC
8-A12G, 1999-02-10
PHARMACEUTICAL PREPARATIONS
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<PAGE>

                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

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

                                    FORM 8-A

                FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES
                     PURSUANT TO SECTION 12(b) OR (g) OF THE
                         SECURITIES EXCHANGE ACT OF 1934



                         TRIANGLE PHARMACEUTICALS, INC.
- ------------------------------------------------------------------------------
               (Exact name of registrant as specified in charter)

               DELAWARE                      000-21589       56-1930728
- ------------------------------------------------------------------------------
(State of incorporation or organization)    (Commission     (IRS Employer
                                            File Number)  Identification No.)

4 UNIVERSITY PLACE, 4611 UNIVERSITY DRIVE, DURHAM, NORTH CAROLINA 27707
- ------------------------------------------------------------------------------
(Address of principal executive offices)


Registrant's telephone number, including area code      (919) 493-5980
                                                   ---------------------------


SECURITIES TO BE REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT:

                                      NONE
- ------------------------------------------------------------------------------
                                (TITLE OF CLASS)

SECURITIES TO BE REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT:

                         PREFERRED STOCK PURCHASE RIGHTS
- ------------------------------------------------------------------------------
                                (TITLE OF CLASS)


<PAGE>

Item 5.  OTHER EVENTS.

                  On January 29, 1999, the Board of Directors of Triangle 
Pharmaceuticals, Inc. (the "Company") declared a dividend of one preferred 
share purchase right (a "Right") for each outstanding share of Common Stock 
(the "Common Stock"), par value $.001 per share, of the Company. In addition, 
the holders of outstanding Series A Preferred Stock will receive one Right 
for each share of Common Stock issuable upon conversion of the Series A 
Preferred Stock. The dividend is payable on February 16, 1999 (the "Record 
Date") to the stockholders of record on that date. Each Right entitles the 
registered holder to purchase from the Company one one-thousandth of a share 
(a "Unit") of Series B Junior Participating Preferred Stock, par value $.001 
per share (the "Series B Preferred Stock"), of the Company at a price of $100 
per Unit (the "Purchase Price"), subject to adjustment. The description and 
terms of the Rights are set forth in a Rights Agreement dated as of February 
1, 1999 (the "Rights Agreement") between the Company and American Stock 
Transfer & Trust Company, as Rights Agent (the "Rights Agent").

                  Until the earlier to occur of (i) the close of business on 
the first date of a public announcement that a person or group of affiliated 
or associated persons (an "Acquiring Person") have acquired beneficial 
ownership of 15% or more of the outstanding Common Stock or (ii) 10 business 
days (or such later date as may be determined by action of the Board of 
Directors prior to such time as any Person becomes an Acquiring Person) 
following the commencement of, or announcement of an intention to make, a 
tender offer or exchange offer the consummation of which would result in the 
beneficial ownership by a person or group of 15% or more of such outstanding 
Common Stock (the earlier of such dates being called the "Distribution 
Date"), the Rights will be evidenced, with respect to any of the Common Stock 
certificates outstanding as of the Record Date, by such Common Stock 
certificate with a copy of this Summary of Rights attached thereto.

                  The Rights Agreement provides that, until the Distribution 
Date, the Rights will be transferred with and only with the Common Stock. 
Until the Distribution Date (or earlier redemption or expiration of the 
Rights), new Common Stock certificates issued after the Record Date, upon 
transfer or new issuance of Common Stock will contain a notation 
incorporating the Rights Agreement by reference. Until the Distribution Date 
(or earlier redemption or expiration of the Rights), the surrender for 
transfer of any certificates for Common Stock, outstanding as of the Record 
Date, even without such notation or a copy of this Summary of Rights being 
attached thereto, will also constitute the transfer of the Rights associated 
with the Common Stock represented by such certificate. As soon as practicable 
following the Distribution Date, separate certificates evidencing the Rights 
("Rights Certificates") will be mailed to holders of record of the Common 
Stock as of the Close of Business on the Distribution Date and such separate 
Rights Certificates alone will evidence the Rights.

                  The Rights are not exercisable until the Distribution Date. 
The Rights will expire at the close of business on February 16, 2009, (the 
"Final Expiration Date"), unless the Final Expiration Date is extended or 
unless the Rights are earlier redeemed or exchanged by the Company, in each 
case as described below.

                  The Purchase Price payable, and the number of Units of 
Series B Preferred Stock or other securities or property issuable, upon 
exercise of the Rights are subject to adjustment from time to time to prevent 
dilution (i) in the event of a stock dividend on, or a subdivision, 
combination or reclassification of, the Series B Preferred Stock, (ii) upon 
the grant to holders of the Units of Series B Preferred Stock of certain 
rights or warrants to subscribe for or purchase Units of Series B Preferred 
Stock at a price, or securities convertible into Units of Series B Preferred 
Stock with a conversion price, less than the then current market price of the 
Units of Series B Preferred Stock or (iii) upon the distribution to holders 
of the Units of Series B Preferred Stock of evidences of indebtedness or 
assets (excluding regular periodic cash dividends paid out of earnings or 
retained earnings or dividends payable in Units of Series B Preferred Stock) 
or of subscription rights or warrants (other than those referred to above).

                  The number of outstanding Rights and the number of Units of 
Series B Preferred Stock issuable upon exercise of each Right are also 
subject to adjustment in the event of a stock split of the Common Stock or a 
stock dividend on the Common Stock payable in Common Stock or subdivisions, 
consolidations or combinations of the Common Stock occurring, in any such 
case, prior to the Distribution Date.

                  Units of Preferred Stock purchasable upon exercise of the 
Rights will not be redeemable. Each Unit of Preferred Stock will be entitled 
to a dividend equal to any dividend declared per share of Common Stock. In 
the event of liquidation, each Unit of Preferred Stock will be entitled to a 
payment equal to any payment made per share of Common Stock. Each Unit of 
Preferred Stock will have one vote, voting together with the Common Stock.


                                      2
<PAGE>

Finally, in the event of any merger, consolidation or other transaction in 
which shares of Common Stock are exchanged, each Unit of Preferred Stock will 
be entitled to receive an amount equal to the amount received per share of 
Common Stock. These rights are protected by customary antidilution provisions.

                  Because of the nature of the dividend, liquidation and 
voting rights, and the value of the Series B Preferred Stock, the Units of 
Series B Preferred Stock purchasable upon exercise of each Right should 
approximate the value of one share of Common Stock.

                  In the event that, after the Rights become exercisable, the 
Company is acquired in a merger or other business combination transaction 
with an Acquiring Person or an affiliate thereof, or 50% or more of its 
consolidated assets or earning power are sold to an Acquiring Person or an 
affiliate thereof, proper provision will be made so that each holder of a 
Right will thereafter have the right to receive, upon exercise thereof at the 
then current exercise price of the Rights, that number of shares of common 
stock of the acquiring company which at the time of such transaction will 
have a market value of two times the exercise price of the Rights.

                  In the event that any person or group of affiliated or 
associated persons becomes the beneficial owner of 15% or more of the 
outstanding shares of Common Stock, proper provision shall be made so that 
each holder of a Right, other than Rights beneficially owned by the Acquiring 
Person (which will thereafter be void), will thereafter have the right to 
receive upon exercise Units of Series B Preferred Stock (or cash, Common 
Stock, other securities or property) having a market value of two times the 
exercise price of the Rights.

                  At any time after the acquisition by a person or group of 
affiliated or associated persons of beneficial ownership of 15% or more of 
the outstanding shares of Common Stock and prior to the acquisition by such 
person or group of 50% or more of the outstanding Common Stock, the Board of 
Directors of the Company may exchange the Rights (other than Rights owned by 
such person or group which have become void), in whole or in part, at an 
exchange ratio of one Unit of Series B Preferred Stock (subject to 
adjustment) which shall equal, subject to adjustment to reflect stock splits, 
stock dividends and similar transactions occurring after the date hereof, 
that number obtained by dividing the Purchase Price by the then current per 
share market price per Unit of Series B Preferred Stock on the earlier of (i) 
the date on which any Person becomes an Acquiring Person and (ii) the date on 
which a tender or exchange offer is announced by any Person, if upon 
consummation thereof such Person would be the Beneficial Owner of 15% or more 
of the shares of Company Common Stock then outstanding.

                  With certain exceptions, no adjustment in the Purchase 
Price will be required until cumulative adjustments require an adjustment of 
at least 1% in such Purchase Price. No fractional shares of Series B 
Preferred Stock will be issued (other than fractions which are integral 
multiples of one one-thousandth of a share of Series B Preferred Stock, which 
may, at the election of the Company, be evidenced by depositary receipts) 
and, in lieu thereof, an adjustment in cash will be made based on the market 
price of the Units of Series B Preferred Stock on the last trading day prior 
to the date of exercise.

                  At any time on or prior to the close of business on the 
first date of a public announcement that a person or group of affiliated or 
associated persons acquire beneficial ownership of 15% or more of the 
outstanding Common Stock (unless the Board of Directors extends such ten-day 
period), the Board of Directors of the Company may redeem the Rights in 
whole, but not in part, at a price of $.001 per Right (the "Redemption 
Price"). The redemption of the rights may be made effective at such time on 
such basis and with such conditions as the Board of Directors in its sole 
discretion may establish. Immediately upon any redemption of the Rights, the 
right to exercise the Rights will terminate and the only right of the holders 
of Rights will be to receive the Redemption Price. The Rights are also 
redeemable under other circumstances as specified in the Rights Agreement.

                  The terms of the Rights may be amended by the Board of 
Directors of the Company without the consent of the holders of the Rights 
except that from and after a Distribution Date no such amendment may 
adversely affect the interests of the holders of the Rights.

                  Until a Right is exercised, the holder thereof, as such, 
will have no rights as a stockholder of the Company, including, without 
limitation, the right to vote or to receive dividends.


                                      3
<PAGE>

                  The Rights have certain anti-takeover effects. The Rights 
will cause substantial dilution to a person or group that attempts to acquire 
the Company on terms not approved by the Company's Board of Directors, except 
pursuant to an offer conditioned on a substantial number of Rights being 
acquired. The Rights should not interfere with any merger or other business 
combination approved by the Board of Directors since the Rights may be 
redeemed by the Company at the Redemption Price prior to the occurrence of a 
Distribution Date.

                  The Rights Agreement, dated as of February 1, 1999 between 
the Company and the Rights Agent, specifying the terms of the Rights, is 
attached hereto as an exhibit and is incorporated herein by reference. The 
foregoing description of the Rights is qualified in its entirety by reference 
to such exhibit. The Certificate of Designation for the Series B Junior 
Participating Preferred Stock is attached hereto as an exhibit. The foregoing 
description of the Series B Junior Participating Preferred Stock is qualified 
in its entirety by reference to such exhibit.

Item 2.  EXHIBITS.

1.       Rights Agreement, dated as of February 1, 1999, between the Company 
         and American Stock Transfer & Trust Company, which includes the form of
         Certificate of Designation for the Series B Junior Participating
         Preferred Stock as Exhibit A, the form of Rights Certificate as Exhibit
         B and the Summary of Rights to Purchase Series B Preferred Stock as
         Exhibit C. Pursuant to the Rights Agreement, printed Right Certificates
         will not be mailed until as soon as practicable after the earlier of
         (i) the close of business on the first date of a public announcement
         that a person or group has acquired beneficial ownership of 15% or more
         of the shares of Common Stock or (ii) the tenth (10th) business day (or
         such later date as may be determined by action of the Board of
         Directors) after a person commences, or announces its intention to
         commence, a tender offer or exchange offer the consummation of which
         would result in the beneficial ownership by a person or group of 15% or
         more of the shares of Common Stock.




                                      4
<PAGE>

                                   SIGNATURE

         Pursuant to the requirements of Section 12 of the Securities 
Exchange Act of 1934, the registrant has duly caused this registration 
statement to be signed on its behalf by the undersigned, thereto duly 
authorized.

                                 TRIANGLE PHARMACEUTICALS, INC.



                                 By:  /s/  James A. Klein, Jr.
                                    -------------------------------------------
                                         Name:  James A. Klein, Jr.
DATE:  February 5, 1999                Chief Financial Officer and Treasurer




                                      5
<PAGE>

                                  EXHIBIT INDEX

<TABLE>
<CAPTION>

EXHIBIT 
NUMBER                         DOCUMENT DESCRIPTION
- -------                        --------------------
<C>    <S>
1.       Rights Agreement, dated as of February 1, 1999, between the Company 
         and American Stock Transfer & Trust Company, which includes the form of
         Certificate of Designation for the Series B Junior Participating
         Preferred Stock as Exhibit A, the form of Rights Certificate as Exhibit
         B and the Summary of Rights to Purchase Preferred Stock as Exhibit C.
         Pursuant to the Rights Agreement, printed Right Certificates will not
         be mailed until as soon as practicable after the earlier of (i) the
         close of business on the first date of a public announcement that a
         person or group has acquired beneficial ownership of 15% or more of the
         shares of Common Stock or (ii) the tenth (10th) business day (or such
         later date as may be determined by action of the Board of Directors)
         after a person commences, or announces its intention to commence, a
         tender offer or exchange offer the consummation of which would result
         in the beneficial ownership by a person or group of 15% or more of the
         shares of Common Stock.

</TABLE>



                                      6

<PAGE>

                           TRIANGLE PHARMACEUTICALS, INC.

                                          
                                        AND
                                          

                      AMERICAN STOCK TRANSFER & TRUST COMPANY
                                          

                                   (RIGHTS AGENT)
                                          

                                  RIGHTS AGREEMENT
                                          

                            DATED AS OF FEBRUARY 1, 1999



                                      
<PAGE>

                                  TABLE OF CONTENTS

<TABLE>
<CAPTION>

                                                                                 Page
                                                                                 ----
<C>          <S>                                                                 <C>
Section 1.     Certain Definitions.. . . . . . . . . . . . . . . . . . . . . . . . .1

Section 2.     Appointment of Rights Agent.. . . . . . . . . . . . . . . . . . . . .5

Section 3.     Issue of Rights Certificates. . . . . . . . . . . . . . . . . . . . .5

Section 4.     Form of Rights Certificates.. . . . . . . . . . . . . . . . . . . . .7

Section 5.     Countersignature and Registration.. . . . . . . . . . . . . . . . . .8

Section 6.     Transfer, Split-Up, Combination and Exchange of Rights
               Certificates; Mutilated, Destroyed, Lost or Stolen Rights
               Certificates. . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Section 7.     Exercise of Rights; Purchase Price; Expiration Date of Rights.. . . .9

Section 8.     Cancellation and Destruction of Rights Certificates.. . . . . . . . 11

Section 9.     Reservation and Availability of Preferred Stock.. . . . . . . . . . 11

Section 10.    Preferred Stock Record Date.. . . . . . . . . . . . . . . . . . . . 12

Section 11.    Adjustment of Purchase Price, Number of Shares or Number of 
               Rights. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Section 12.    Certificate of Adjusted Purchase Price or Number of Shares. . . . . 20

Section 13.    Consolidation, Merger or Sale or Transfer of Assets or Earning 
               Power.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Section 14.    Fractional Rights and Fractional Shares.. . . . . . . . . . . . . . 24

Section 15.    Rights of Action. . . . . . . . . . . . . . . . . . . . . . . . . . 25

Section 16.    Agreement of Rights Holders.. . . . . . . . . . . . . . . . . . . . 25

Section 17.    Rights Certificate Holder Not Deemed a Stockholder. . . . . . . . . 26

Section 18.    Concerning the Rights Agent.. . . . . . . . . . . . . . . . . . . . 26

Section 19.    Merger or Consolidation or Change of Name of Rights Agent.. . . . . 26

Section 20.    Duties of Rights Agent. . . . . . . . . . . . . . . . . . . . . . . 27

Section 21.    Change of Rights Agent. . . . . . . . . . . . . . . . . . . . . . . 29

Section 22.    Issuance of New Rights Certificates.. . . . . . . . . . . . . . . . 30

Section 23.    Redemption and Termination. . . . . . . . . . . . . . . . . . . . . 31

Section 24.    Exchange. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Section 25.    Notice of Certain Events. . . . . . . . . . . . . . . . . . . . . . 33

Section 26.    Notices.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Section 27.    Supplements and Amendments. . . . . . . . . . . . . . . . . . . . . 34

Section 28.    Successors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Section 29.    Determinations and Actions by the Board of Directors. . . . . . . . 35

</TABLE>

                                      i
<PAGE>

                                  TABLE OF CONTENTS

                                     (CONTINUED)

<TABLE>
<CAPTION>

                                                                                 Page
                                                                                 ----
<C>          <S>                                                                 <C>
Section 30.    Benefits of This Agreement. . . . . . . . . . . . . . . . . . . . . 35

Section 31.    Severability. . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Section 32.    Governing Law.. . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Section 33.    Counterparts. . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Section 34.    Descriptive Headings. . . . . . . . . . . . . . . . . . . . . . . . 36

EXHIBITS

Exhibit A -    Form of Certificate of Designation of Series B Junior
               Participating Preferred Stock

Exhibit B -    Form of Rights Certificate

Exhibit C -    Summary of Rights to Purchase Shares of Series B Junior
               Participating Preferred Stock

</TABLE>



                                      ii.
<PAGE>

                                RIGHTS AGREEMENT

              RIGHTS AGREEMENT, dated as of February 1, 1999, between 
Triangle Pharmaceuticals, Inc., a Delaware corporation (the "Company"), and 
American Stock Transfer & Trust Company (the "Rights Agent").

              WHEREAS, effective January 29, 1999 (the "Rights Dividend 
Declaration Date"), the Board of Directors authorized and declared a 
distribution of one Right (each, a "Right") for each share of Common Stock 
(as hereinafter defined) of the Company outstanding as of the Close of 
Business (as hereinafter defined) on February 16 (the "Record Date"), each 
Right initially representing the right to purchase one one-thousandth of a 
share (a "Unit") of Preferred Stock (as hereinafter defined) upon the terms 
and subject to the conditions herein set forth, and has further authorized 
and directed the issuance of one Right with respect to each share of Common 
Stock that shall become outstanding between the Record Date and the earliest 
of the Distribution Date, the Redemption Date or the Final Expiration Date 
(as such terms are hereinafter defined).

              NOW, THEREFORE, in consideration of the premises and the mutual 
agreements herein set forth, the parties hereby agree as follows:

              Section 1.    CERTAIN DEFINITIONS.  For purposes of this 
Agreement, the following terms have the meanings indicated:

              (a)    "Acquiring Person" shall mean any Person (as such term 
is hereinafter defined) who or which, together with all Affiliates and 
Associates (as such terms are hereinafter defined) of such Person, shall be 
the Beneficial Owner (as such term is hereinafter defined) of 15% or more of 
the shares of Common Stock of the Company then outstanding but shall not 
include the Company, any Subsidiary (as such term is hereinafter defined) of 
the Company, any employee benefit plan of the Company or any Subsidiary of 
the Company, or any entity holding shares of Common Stock for or pursuant to 
the terms of any such plan.  Notwithstanding the foregoing:

              (i)    no Person shall become an "Acquiring Person" as the result
       of an acquisition of shares of Common Stock by the Company which, by
       reducing the number of shares outstanding, increases the proportionate
       number of shares beneficially owned by such Person to 15% or more of the
       shares of Common Stock of the Company then outstanding; PROVIDED,
       HOWEVER, that if a Person shall become the Beneficial Owner of 15% or
       more of the shares of Common Stock of the Company then outstanding by
       reason of share purchases by the Company and shall, after such share
       purchases by the Company, become the Beneficial Owner of any additional
       shares of Common Stock of the Company, then such Person shall be deemed
       to be an "Acquiring Person" hereunder; and

              (ii)   if the Board of Directors of the Company determines in good
       faith that a Person who would otherwise be an "Acquiring Person" as
       defined pursuant to the foregoing provisions of this paragraph (a), has
       become such inadvertently, and such Person divests as promptly as
       practicable a sufficient number of shares of Common Stock 


                                      1.
<PAGE>

       so that such Person would no longer be an "Acquiring Person" (as defined 
       pursuant to the foregoing provisions of this paragraph (a)), then such 
       Person shall not be deemed to be an "Acquiring Person" for any purpose of
       this Agreement.

              (b)    "Adjustment Shares" has the meaning set forth in Section 
11(a)(ii).

              (c)    "Affiliate" and "Associate" shall have the respective 
meanings ascribed to such terms in Rule 12b-2 of the General Rules and 
Regulations under the Securities Exchange Act of 1934, as amended (the 
"Exchange Act"), as in effect on the date of this Agreement.

              (d)    A Person shall be deemed the "Beneficial Owner" of, and 
shall be deemed to "beneficially own," any securities:

              (i)    which such Person or any of such Person's Affiliates or
       Associates beneficially owns, directly or indirectly, for purposes of
       Section 13(d) of the Exchange Act and Rule 13d-3 thereunder (or any
       comparable or successor law or regulation); or

              (ii)   which such Person or any of such Person's Affiliates or
       Associates, directly or indirectly, has (A) the right to acquire (whether
       such right is exercisable immediately or only after the passage of time)
       pursuant to any agreement, arrangement or understanding (whether or not
       in writing, other than customary agreements with and between underwriters
       and selling group members with respect to a bona fide public offering of
       securities), or upon the exercise of conversion rights, exchange rights,
       rights (other than the Rights), warrants or options, or otherwise;
       PROVIDED, HOWEVER, that a Person shall not be deemed the Beneficial Owner
       of, or to beneficially own, securities tendered pursuant to a tender or
       exchange offer made by or on behalf of such Person or any of such
       Person's Affiliates or Associates until such tendered securities are
       accepted for purchase or exchange; or (B) the right to vote pursuant to
       any agreement, arrangement or understanding; PROVIDED FURTHER, HOWEVER,
       that a Person shall not be deemed the "Beneficial Owner" of, or to
       "beneficially own," any security under this subparagraph (ii) as a result
       of an agreement, arrangement or understanding to vote such security if
       such agreement, arrangement or understanding: (x) arises solely from a
       revocable proxy given in response to a public proxy or consent
       solicitation made pursuant to, and in accordance with, the applicable
       provisions of the Exchange Act and the Exchange Act Regulations, and
       (y) is not reportable by such Person on Schedule 13D under the Exchange
       Act (or any comparable or successor report); or

              (iii)  which are beneficially owned, directly or indirectly, by
       any other Person (or any Affiliate or Associate thereof) with which such
       Person (or any of such Person's Affiliates or Associates) has any
       agreement, arrangement or understanding, (whether or not in writing,
       other than customary agreements with and between underwriters and selling
       group members with respect to a bona fide public offering of securities),
       for the purpose of acquiring, holding, voting (except to the extent
       contemplated by the proviso to subparagraph (i) of this paragraph (d)) or
       disposing of any securities of the Company; PROVIDED, HOWEVER, that in no
       case shall an officer or director of the Company be deemed (A) the
       Beneficial Owner of any securities beneficially owned by another officer
       or director of the Company solely by reason of actions undertaken by such
       persons in their 


                                      2.
<PAGE>

       capacity as officers or directors of the Company or (B) the Beneficial 
       Owner of securities held of record by the trustee of any employee benefit
       plan of the Company or any Subsidiary of the Company for the benefit of 
       any employee of the Company or any Subsidiary of the Company, other than 
       the officer or director, by reason of any influence that such officer or 
       director may have over the voting of the securities held in the plan;

              (iv)   Notwithstanding anything in this definition of "Beneficial
       Owner" and "beneficially own" to the contrary, the phrase "then
       outstanding," when used with reference to a Person who is the Beneficial
       Owner of securities of the Company, shall mean the number of such
       securities then issued and outstanding together with the number of such
       securities not then actually issued and outstanding which such Person
       would be deemed to beneficially own hereunder.

              (e)    "Business Day" shall mean any day other than a Saturday, 
a Sunday, or a day on which banking institutions in the State of California 
are authorized or obligated by law or executive order to close.

              (f)    "Close of Business" on any given date shall mean 5:00 
P.M., Eastern time, on such date; PROVIDED, HOWEVER, that if such date is not 
a Business Day it shall mean 5:00 P.M., California time, on the next 
succeeding Business Day.

              (g)    "Common Stock" when used with reference to the Company 
shall mean the shares of common stock of the Company, par value $0.001 per 
share.  "Common Stock" when used with reference to any Person other than the 
Company shall mean the capital stock (or other equity interest) with the 
greatest voting power of such other Person or, if such other Person is a 
Subsidiary of another Person, the Person or Persons which ultimately control 
such first-mentioned Person.

              (h)    "Company" shall have the meaning set forth in the 
recitals to this Agreement.

              (i)     "current per share market price" shall have the meaning 
set forth in Section 11(d)(i) hereof.

              (j)    "Current Value" shall have the meaning set forth in 
Section 11(a)(iii) hereof. 

              (k)    "Directors" shall mean the members of the Board of 
Directors of the Company. 

              (l)    "Distribution Date" shall have the meaning set forth in 
Section 3(a) hereof.

              (m)    "equivalent preferred stock" shall have the meaning set 
forth in Section 11(b) hereof.

              (n)    "Exchange Act" shall mean the Securities Exchange Act of 
1934, as amended.


                                      3.
<PAGE>

              (o)    "Exchange Act Regulations" shall mean the General Rules 
and Regulations under the Exchange Act.

              (p)    "Exchange Ratio" shall have the meaning set forth in 
Section 24 hereof.

              (q)    "Expiration Date" shall have the meaning set forth in 
Section 7(a) hereof.

              (r)    "Final Expiration Date" shall have the meaning set forth 
in Section 7(a) hereof.

              (s)    "Nasdaq" shall have the meaning set forth in Section 
11(d) hereof.

              (t)    "Person" shall mean any individual, firm, corporation or 
other entity, and shall include any successor (by merger or otherwise) of 
such entity.

              (u)    "Preferred Stock" shall mean shares of Series B Junior 
Participating Preferred Stock, par value $0.001, of the Company having the 
rights and preferences set forth in the Form of Certificate of Designation 
attached to this Agreement as EXHIBIT A.

              (v)    "preferred stock equivalents" shall have the meaning set 
forth in Section 11(a)(iii) hereof.

              (w)    "Purchase Price" shall have the meaning set forth in 
Section 7(b) hereof.

              (x)    "Record Date" shall have the meaning set forth in the 
recitals to this Agreement.

              (y)    "Redemption Date" shall have the meaning set forth in 
Section 7(a) hereof.

              (z)    "Redemption Price" shall have the meaning set forth in 
Section 23(a) hereof.

              (aa)   "Right" shall have the meaning set forth in the recitals 
to this Agreement.

              (bb)   "Rights Agent" shall have the meaning set forth in the 
recitals to this Agreement.

              (cc)   "Rights Certificate" shall have the meaning set forth in 
Section 3(a) hereof.

              (dd)   "Rights Dividend Declaration Date" shall have the 
meaning set forth in the recitals to this Agreement.

              (ee)   "Section 11(a)(ii) Event" shall mean any event described 
in Section 11(a)(ii)(A), (B) or (C) hereof.


                                      4.
<PAGE>

              (ff)   "Section 11(a)(iii) Trigger Date" shall have the meaning 
set forth in Section 11(a)(iii) hereof.

              (gg)   "Section 13 Event" shall mean any event described in 
clause (x), (y) or (z) of Section 13(a) hereof.

              (hh)   "Section 24(a) Exchange Ratio" has the meaning set forth 
in Section 24(a) hereof.

              (ii)   "Securities Act" shall mean the Securities Act of 1933, 
as amended.

              (jj)   "Shares Acquisition Date" shall mean the first date of 
public announcement (which, for purposes of this definition, shall include, 
without limitation, a report filed pursuant to Section 13(d) of the Exchange 
Act) by the Company or an Acquiring Person that an Acquiring Person has 
become such.

              (kk)   "Spread" shall have the meaning set forth in Section 
11(a)(iii) hereof.

              (ll)   "Subsidiary" of any Person shall mean any corporation or 
other entity of which a majority of the voting power of the voting equity 
securities or equity interest is owned, directly or indirectly, by such 
Person.

              (mm)   "Summary of Rights" shall have the meaning set forth in 
Section 3(b) hereof.

              (nn)   "Trading Day" shall have the meaning set forth in 
Section 11(d)(i) hereof.

              (oo)   "Triggering Event" shall mean any Section 11(a)(ii) 
Event or any Section 13 Event.

              Section 2.    APPOINTMENT OF RIGHTS AGENT.  The Company hereby 
appoints the Rights Agent to act as agent for the Company in accordance with 
the terms and conditions hereof, and the Rights Agent hereby accepts such 
appointment.  The Company may from time to time appoint such co-Rights Agents 
as it may deem necessary or desirable.

              Section 3.    ISSUE OF RIGHTS CERTIFICATES.  

              (a)    Until the earlier of (i) the Close of Business on the 
Shares Acquisition Date and (ii) the Close of Business on the tenth Business 
Day (or such later date as may be determined by a majority of the Directors 
prior to such time as any Person becomes an Acquiring Person and of which the 
Company will give the Rights Agent prompt written notice) after the date that 
a tender or exchange offer by any Person (other than the Company, any 
Subsidiary of the Company, any employee benefit plan of the Company or of any 
Subsidiary of the Company or any entity holding shares of Common Stock for or 
pursuant to the terms of any such plan) is first published or sent or given 
within the meaning of Rule 14d-4(a) of the Exchange Act Regulations or any 
successor rule or of the first public announcement of the intention of any 
Person (other than the Company, any Subsidiary of the Company, any employee 
benefit plan of the Company or of any Subsidiary of the Company or any entity 
holding shares of Common 


                                      5.
<PAGE>

Stock for or pursuant to the terms of any such plan) to commence a tender or 
exchange offer, if upon consummation thereof such Person would be the 
Beneficial Owner of 15% or more of the shares of Company Common Stock then 
outstanding (the earlier of (i) and (ii) above being the "Distribution 
Date"), (x) the Rights will be evidenced (subject to the provisions of 
Section 3(b) hereof) by the certificates for shares of Common Stock 
registered in the names of the holders thereof (which certificates shall also 
be deemed to be Rights Certificates) and not by separate Rights Certificates, 
and (y) the right to receive Rights Certificates will be transferable only in 
connection with the transfer of shares of Common Stock.  As soon as 
practicable after the Distribution Date, the Company will notify the Rights 
Agent thereof and the Company will prepare and execute, the Rights Agent will 
countersign, and the Company will send or cause to be sent (and the Rights 
Agent will, if requested, send) by first-class, insured, postage-prepaid 
mail, to each record holder of shares of Common Stock as of the Close of 
Business on the Distribution Date, at the address of such holder shown on the 
records of the Company, a Rights Certificate, in substantially the form of 
EXHIBIT B hereto (a "Rights Certificate"), evidencing one Right for each 
share of Common Stock so held.  As of the Distribution Date, the Rights will 
be evidenced solely by such Rights Certificates.

              (b)    On the Record Date, or as soon as practicable 
thereafter, the Company will send a copy of a Summary of Rights to Purchase 
Shares of Series B Junior Participating Preferred Stock, in substantially the 
form of EXHIBIT C hereto (the "Summary of Rights"), by first-class, 
postage-prepaid mail, to each record holder of shares of Common Stock as of 
the Close of Business on the Record Date, at the address of such holder shown 
on the records of the Company. With respect to certificates for shares of 
Common Stock outstanding as of the Record Date, until the Distribution Date, 
the Rights will be evidenced by such certificates registered in the names of 
the holders thereof together with a copy of the Summary of Rights attached 
thereto.  Until the Distribution Date (or the Expiration Date), the surrender 
for transfer of any certificate for shares of Common Stock outstanding on the 
Record Date, with or without a copy of the Summary of Rights attached 
thereto, shall also constitute the transfer of the Rights associated with the 
shares of Common Stock represented thereby.

              (c)    Certificates for shares of Common Stock which become 
outstanding (including, without limitation, reacquired shares of Common Stock 
referred to in the last sentence of this paragraph (c)) after the Record Date 
but prior to the earlier of the Distribution Date and the Expiration Date 
shall have impressed on, printed on, written on or otherwise affixed to them 
the following legend:

              This certificate also evidences and entitles the
              holder hereof to certain rights as set forth in a
              Rights Agreement between Triangle Pharmaceuticals,
              Inc. and American Stock Transfer & Trust Company,
              dated as of February 1, 1999 (the "Rights
              Agreement"), the terms of which are hereby
              incorporated herein by reference and a copy of which
              is on file at the principal executive offices of
              Triangle Pharmaceuticals, Inc.  Under certain
              circumstances, as set forth in the Rights Agreement,
              such Rights will be evidenced by separate
              certificates and will no longer be evidenced by this
              certificate. Triangle Pharmaceuticals, Inc. will
              mail to the holder of this certificate a copy of the
              Rights Agreement without charge after 


                                      6.
<PAGE>

              receipt of a written request therefor.  Under certain 
              circumstances, as set forth in the Rights Agreement, 
              Rights issued to, or held by, any Person who is, was or 
              becomes an Acquiring Person or any Affiliate or Associate 
              thereof (as such terms are defined in the Rights 
              Agreement), whether currently held by or on behalf of 
              such Person or by any subsequent holder, may become null 
              and void.
              
With respect to such certificates containing the foregoing legend, until the 
earlier of the Distribution Date and the Expiration Date, the Rights 
associated with the shares of Common Stock represented by such certificates 
shall be evidenced by such certificates alone, and the surrender for transfer 
of any such certificate shall also constitute the transfer of the Rights 
associated with the shares of Common Stock represented thereby.  In the event 
that the Company purchases or acquires any shares of Common Stock after the 
Record Date but prior to the Distribution Date, any Rights associated with 
such shares of Common Stock shall be deemed cancelled and retired so that the 
Company shall not be entitled to exercise any Rights associated with the 
shares of Common Stock which are no longer outstanding.

              Section 4.    FORM OF RIGHTS CERTIFICATES.  

              (a)    The Rights Certificates (and the forms of election to 
purchase Units of Preferred Stock and of assignment to be printed on the 
reverse thereof) shall be substantially the same as EXHIBIT B hereto and may 
have such marks of identification or designation and such legends, summaries 
or endorsements printed thereon as the Company may deem appropriate and as 
are not inconsistent with the provisions of this Agreement, or as may be 
required to comply with any applicable law or with any rule or regulation 
made pursuant thereto or with any rule or regulation of any stock exchange or 
transaction reporting system on which the Rights may from time to time be 
listed, or to conform to usage.  Subject to the provisions of Section 11 and 
Section 22 hereof, the Rights Certificates shall entitle the holders thereof 
to purchase the number of Units of Preferred Stock as shall be set forth 
therein at the price per Unit of Preferred Stock set forth therein, but the 
number of such Units of Preferred Stock and the Purchase Price shall be 
subject to adjustment as provided herein.

              (b)    Any Rights Certificate issued pursuant hereto that 
represents Rights beneficially owned by: (i) an Acquiring Person or any 
Associate or Affiliate of an Acquiring Person, (ii) a transferee of an 
Acquiring Person (or of any such Associate or Affiliate) who becomes a 
transferee after the Acquiring Person becomes such or (iii) a transferee of 
an Acquiring Person (or of any such Associate or Affiliate) who becomes a 
transferee prior to or concurrently with the Acquiring Person becoming such 
and receives such Rights pursuant to either (A) a transfer (whether or not 
for consideration) from the Acquiring Person to holders of equity interests 
in such Acquiring Person or to any Person with whom such Acquiring Person has 
any continuing agreement, arrangement or understanding regarding the 
transferred Rights or (B) a transfer which a majority of the Directors of the 
Company has determined is part of a plan, arrangement or understanding which 
has as a primary purpose or effect avoidance of Section 7(e) hereof shall 
contain (to the extent feasible) the following legend:

              The Rights represented by this Rights Certificate are or were
              beneficially owned by a Person who was or became an Acquiring
              Person or an Affiliate or Associate 


                                      7.
<PAGE>

              of an Acquiring Person (as such terms are defined in the 
              Rights Agreement between Triangle Pharmaceuticals, Inc. and 
              American Stock Transfer & Trust Company, as Rights Agent, 
              dated as of February 1, 1999 (the "Rights Agreement").  
              Accordingly, this Rights Certificate and the Rights 
              represented hereby may become null and void in the 
              circumstances specified in Section 7(e) of the Rights 
              Agreement.

              Section 5.    COUNTERSIGNATURE AND REGISTRATION. 

              (a)    The Rights Certificates shall be executed on behalf of 
the Company by its Chairman of the Board, its Chief Executive Officer, its 
President, any of its Vice Presidents, or its Treasurer or Chief Financial 
Officer, either manually or by facsimile signature, shall have affixed 
thereto the Company's seal or a facsimile thereof, and shall be attested by 
the Secretary or an Assistant Secretary of the Company, either manually or by 
facsimile signature.  The Rights Certificates shall be manually countersigned 
by the Rights Agent and shall not be valid for any purpose unless 
countersigned. In case any officer of the Company who shall have signed any 
of the Rights Certificates shall cease to be such officer of the Company 
before countersignature by the Rights Agent and issuance and delivery by the 
Company, such Rights Certificates, nevertheless, may be countersigned by the 
Rights Agent and issued and delivered by the Company with the same force and 
effect as though the person who signed such Rights Certificates had not 
ceased to be such officer of the Company; and any Rights Certificate may be 
signed on behalf of the Company by any person who, at the actual date of the 
execution of such Rights Certificate, shall be a proper officer of the 
Company to sign such Rights Certificate, although at the date of the 
execution of this Rights Agreement any such person was not such an officer.

              (b)    Following the Distribution Date, the Rights Agent will 
keep or cause to be kept, at its office designated for such purpose, books 
for registration and transfer of the Rights Certificates issued hereunder.  
Such books shall show the names and addresses of the respective holders of 
the Rights Certificates, the number of Rights evidenced on its face by each 
of the Rights Certificates and the date of each of the Rights Certificates.

              Section 6.    TRANSFER, SPLIT-UP, COMBINATION AND EXCHANGE OF 
RIGHTS CERTIFICATES; MUTILATED, DESTROYED, LOST OR STOLEN RIGHTS 
CERTIFICATES.  

              (a)    Subject to the provisions of Sections 4(b), 7(e) and 14 
hereof, at any time after the Close of Business on the Distribution Date, and 
at or prior to the Close of Business on the Expiration Date, any Rights 
Certificate or Rights Certificates may be transferred, split up, combined or 
exchanged for another Rights Certificate or Rights Certificates, entitling 
the registered holder to purchase a like number of Units of Preferred Stock 
(or, following a Triggering Event, other securities, cash or other assets, as 
the case may be) as the Rights Certificate or Rights Certificates surrendered 
then entitled such holder to purchase.  Any registered holder desiring to 
transfer, split up, combine or exchange any Rights Certificate or Rights 
Certificates shall make such request in writing delivered to the Rights 
Agent, and shall surrender the Rights Certificate or Rights Certificates to 
be transferred, split up, combined or exchanged at the office of the Rights 
Agent designated for such purpose. Neither the Rights Agent nor the Company 
shall be obligated to take any action whatsoever with respect to the 


                                      8.
<PAGE>

transfer of any such surrendered Rights Certificate until the registered 
holder shall have completed and signed the certificate contained in the form 
of assignment on the reverse side of such Rights Certificate and shall have 
provided such additional evidence of the identity of the Beneficial Owner (or 
former Beneficial Owner) or Affiliates or Associates thereof as the Company 
shall reasonably request.  Thereupon the Rights Agent shall, subject to 
Sections 4(b), 7(e) and 14 hereof, countersign and deliver to the person 
entitled thereto a Rights Certificate or Rights Certificates, as the case may 
be, as so requested.  The Company may require payment of a sum sufficient to 
cover any tax or governmental charge that may be imposed in connection with 
any transfer, split up, combination or exchange of Rights Certificates.

              (b)    Upon receipt by the Company and the Rights Agent of 
evidence reasonably satisfactory to them of the loss, theft, destruction or 
mutilation of a Rights Certificate, and, in case of loss, theft or 
destruction, of indemnity or security reasonably satisfactory to them, and, 
at the Company's request, reimbursement to the Company and the Rights Agent 
of all reasonable expenses incidental thereto, and upon surrender to the 
Rights Agent and cancellation of the Rights Certificate if mutilated, the 
Company will make and deliver a new Rights Certificate of like tenor to the 
Rights Agent for delivery to the registered holder in lieu of the Rights 
Certificate so lost, stolen, destroyed or mutilated.

              Section 7.    EXERCISE OF RIGHTS; PURCHASE PRICE; EXPIRATION 
DATE OF RIGHTS.  

              (a)    Except as provided in Sections 23(c) and 7(e), the 
registered holder of any Rights Certificate may exercise the Rights evidenced 
thereby (except as otherwise provided herein) in whole or in part at any time 
after the Distribution Date upon surrender of the Rights Certificate, with 
the form of election to purchase and certification on the reverse side 
thereof duly executed, to the Rights Agent at the office of the Rights Agent 
designated for such purpose, together with payment of the Purchase Price for 
each Unit of Preferred Stock as to which the Rights are exercised, at or 
prior to the earliest of (i) the Close of Business on the tenth anniversary 
hereof (the "Final Expiration Date"), (ii) the time at which the Rights are 
redeemed as provided in Section 23 hereof (the "Redemption Date"), or (iii) 
the time at which such Rights are exchanged as provided in Section 24 hereof 
(the earlier of (i), (ii) and (iii) being the "Expiration Date").

              (b)    The Purchase Price for each Unit of Preferred Stock 
pursuant to the exercise of a Right shall initially be One Hundred dollars 
($100.00), shall be subject to adjustment from time to time as provided in 
Sections 11 and 13 hereof and shall be payable in lawful money of the United 
States of America in accordance with paragraph (c) below.

              (c)    Upon receipt of a Rights Certificate representing 
exercisable Rights, with the form of election to purchase duly executed, 
accompanied by payment of the Purchase Price for the number of Units of 
Preferred Stock (or other securities or property, as the case may be) to be 
purchased and an amount equal to any applicable transfer tax required to be 
paid by the holder of such Rights Certificate in accordance with Section 9 
hereof in cash, or by certified check or cashier's check payable to the order 
of the Company, the Rights Agent shall, subject to Section 20(k) hereof, 
thereupon promptly (i) (A) requisition from any transfer agent of the 
Preferred Stock (or make available, if the Rights Agent is the transfer agent 
for the Preferred Stock) a 


                                      9.
<PAGE>

certificate or certificates for the number of Units of Preferred Stock to be 
purchased and the Company hereby irrevocably authorizes its transfer agent to 
comply with all such requests or (B) if the Company shall have elected to 
deposit the total number of Units of Preferred Stock issuable upon exercise 
of the Rights hereunder with a depositary agent, requisition from the 
depositary agent of a depositary receipt or depositary receipts representing 
such number of Units of Preferred Stock as are to be purchased (in which case 
certificates for the Units of Preferred Stock represented by such receipt or 
receipts shall be deposited by the transfer agent with the depositary agent) 
and the Company hereby directs the depositary agent to comply with such 
request, (ii) when appropriate, requisition from the Company the amount of 
cash to be paid in lieu of issuance of fractional shares in accordance with 
Section 14 hereof, (iii) after receipt of such certificates or depositary 
receipts, cause the same to be delivered to or upon the order of the 
registered holder of such Rights Certificate, registered in such name or 
names as may be designated by such holder and (iv) when appropriate, after 
receipt thereof, deliver such cash to or upon the order of the registered 
holder of such Rights Certificate.  The payment of the Purchase Price (as 
such amount may be reduced (including to zero) pursuant to Section 11(a)(iii) 
hereof) may be made in cash or by certified bank check or bank draft payable 
to the order of the Company.  In the event that the Company is obligated to 
issue other securities of the Company, pay cash and/or distribute other 
property pursuant to Section 11(a) hereof, the Company will make all 
arrangements necessary so that such other securities,cash and/or other 
property are available for distribution by the Rights Agent, if and when 
appropriate.

              (d)    In case the registered holder of any Rights Certificate 
shall exercise less than all the Rights evidenced thereby, a new Rights 
Certificate evidencing a number of Rights equivalent to the number of Rights 
remaining unexercised shall be issued by the Rights Agent to the registered 
holder of such Rights Certificate or to such registered holder's duly 
authorized assigns, subject to the provisions of Section 14 hereof.

              (e)    Notwithstanding anything in this Agreement to the 
contrary, from and after the first occurrence of a Triggering Event, any 
Rights beneficially owned by (i) an Acquiring Person or an Associate or 
Affiliate of an Acquiring Person, (ii) a transferee of an Acquiring Person 
(or of any such Associate or Affiliate) who becomes a transferee after the 
Acquiring Person becomes such (a "Post Transferee"), (iii) a transferee of an 
Acquiring Person (or of any such Associate or Affiliate) who becomes a 
transferee prior to or concurrently with the Acquiring Person becoming such 
and receives such Rights pursuant to either (A) a transfer (whether or not 
for consideration) from the Acquiring Person to holders of equity interests 
in such Acquiring Person or to any Person with whom the Acquiring Person has 
any continuing agreement, arrangement or understanding regarding the 
transferred Rights or (B) a transfer which a majority of the Directors of the 
Company has determined is part of a plan, arrangement or understanding which 
has as a primary purpose or effect the avoidance of this Section 7(e) (a 
"Prior Transferee") or (iv) any subsequent transferee receiving transferred 
Rights from a Post Transferee or a Prior Transferee, either directly or 
through one or more intermediate transferees, shall become null and void 
without any further action and no holder of such Rights shall have any rights 
whatsoever with respect to such Rights, whether under any provision of this 
Agreement or otherwise.  The Company shall use all reasonable efforts to 
ensure that the provisions of this Section 7(e) and Section 4(b) hereof are 
complied with, but shall have no liability to any holder of Rights 
Certificates or to any other Person as a result of its failure to 


                                      10.
<PAGE>

make any determinations with respect to an Acquiring Person or any of such 
Acquiring Person's Affiliates, Associates or transferees hereunder.

              (f)    Notwithstanding anything in this Agreement to the 
contrary, neither the Rights Agent nor the Company shall be obligated to 
undertake any action with respect to a registered holder upon the occurrence 
of any purported exercise as set forth in this Section 7 unless such 
registered holder shall have (i) completed and signed the certificate 
contained in the form of election to purchase set forth on the reverse side 
of the Rights Certificate surrendered for such exercise and (ii) provided 
such additional evidence of the identity of the Beneficial Owner (or former 
Beneficial Owner) or Affiliates or Associates thereof as the Company shall 
reasonably request.

              Section 8.    CANCELLATION AND DESTRUCTION OF RIGHTS 
CERTIFICATES. All Rights Certificates surrendered for the purpose of 
exercise, transfer, split up, combination or exchange shall, if surrendered 
to the Company or to any of its agents, be delivered to the Rights Agent for 
cancellation or in cancelled form, or, if surrendered to the Rights Agent, 
shall be cancelled by it, and no Rights Certificates shall be issued in lieu 
thereof except as expressly permitted by any of the provisions of this Rights 
Agreement.  The Company shall deliver to the Rights Agent for cancellation 
and retirement, and the Rights Agent shall so cancel and retire, any other 
Rights Certificate purchased or acquired by the Company otherwise than upon 
the exercise thereof.  The Rights Agent shall deliver all cancelled Rights 
Certificates to the Company, or shall, at the written request of the Company, 
destroy such cancelled Rights Certificates, and in such case shall deliver a 
certificate of destruction thereof to the Company.

              Section 9.    RESERVATION AND AVAILABILITY OF PREFERRED STOCK.

              (a)    The Company covenants and agrees that it will use its 
best efforts to cause to be reserved and kept available out of and to the 
extent of its authorized and unissued Units of Preferred Stock not reserved 
for another purpose that will be sufficient to permit the exercise in full of 
all outstanding Rights.  Upon the occurrence of any events resulting in an 
increase in the aggregate number of shares of Preferred Stock (or other 
equity securities of the Company) issuable upon exercise of all outstanding 
Rights above the number then reserved, the Company shall make appropriate 
increases in the number of shares so reserved.

              (b)    If the Units of Preferred Stock to be issued and 
delivered upon the exercise of the Rights are at any time listed on a 
national securities exchange or included for quotation on any transaction 
reporting system, the Company shall during the period from the Distribution 
Date to the Expiration Date use its best efforts to cause all shares reserved 
for such issuance to be listed on such exchange or included for quotation on 
any such transaction reporting system upon official notice of issuance upon 
such exercise.

              (c)    The Company shall use its best efforts to (i) file, as 
soon as practicable following the earliest date after the first occurrence of 
a Section 11(a)(ii) Event in which the consideration to be delivered by the 
Company upon exercise of the Rights has been determined in accordance with 
Section 11(a)(iii) hereof, or as soon as is required by law following the 
Distribution Date, as the case may be, a registration statement under the 
Securities Act, with respect to the securities purchasable upon exercise of 
the Rights on an appropriate form, 


                                      11.
<PAGE>

(ii) cause such registration statement to become effective as soon as 
practicable after such filing and (iii) cause such registration statement to 
remain effective (with a prospectus at all times meeting the requirements of 
the Securities Act) until the earlier of (A) the date as of which the Rights 
are no longer exercisable for such securities and (B) the Expiration Date.  
The Company will also take such action as may be appropriate under, or to 
ensure compliance with, the securities or "blue sky" laws of the various 
states in connection with the exercisability of the Rights. Notwithstanding 
any provision of this Agreement to the contrary, the Rights shall not be 
exercisable in any jurisdiction, unless the requisite qualification in such 
jurisdiction shall have been obtained, or an exemption therefrom shall be 
available and until a registration statement has been declared effective.

              (d)    The Company covenants and agrees that it will take all 
such action as may be necessary to ensure that all Units of Preferred Stock 
(and, following the occurrence of a Triggering Event, any other securities 
that may be delivered upon exercise of Rights) shall, at the time of delivery 
of the certificates for such Units of Preferred Stock (subject to payment of 
the Purchase Price), be duly and validly authorized and issued and fully paid 
and non-assessable.

              (e)    The Company further covenants and agrees that it will 
pay when due and payable any and all federal and state transfer taxes and 
charges which may be payable in respect of the issuance or delivery of the 
Rights Certificates or of any Units of Preferred Stock upon the exercise of 
Rights. The Company shall not, however, be required to pay any transfer tax 
which may be payable in respect of any transfer or delivery of Rights 
Certificates to a person other than, or the issuance or delivery of 
certificates or depositary receipts for Units of Preferred Stock in a name 
other than that of, the registered holder of the Rights Certificate 
evidencing Rights surrendered for exercise or to issue or to deliver any 
certificates or depositary receipts for Units of Preferred Stock upon the 
exercise of any Rights until any such tax shall have been paid (any such tax 
being payable by the holder of such Rights Certificate at the time of 
surrender) or until it has been established to the Company's reasonable 
satisfaction that no such tax is due.

              Section 10.   PREFERRED STOCK RECORD DATE.  Each person in 
whose name any certificate for Units of Preferred Stock (or, following the 
occurrence of a Triggering Event, other securities) is issued upon the 
exercise of Rights shall for all purposes be deemed to have become the holder 
of record of the Units of Preferred Stock (or, following the occurrence of a 
Triggering Event, other securities) represented thereby on, and such 
certificate shall be dated, the date upon which the Rights Certificate 
evidencing such Rights was duly surrendered and payment of the aggregate 
Purchase Price (and any applicable transfer taxes) was made; PROVIDED, 
HOWEVER, that if the date of such surrender and payment is a date upon which 
the Preferred Stock (or, following the occurrence of a Triggering Event, 
other securities) transfer books of the Company are closed, such person shall 
be deemed to have become the record holder of such shares on, and such 
certificate shall be dated, the next succeeding Business Day on which the 
Preferred Stock transfer books of the Company are open; PROVIDED FURTHER, 
HOWEVER, that if delivery of Units of Preferred Stock is delayed pursuant to 
Section 9(c), such Persons shall be deemed to have become the record holders 
of such Units of Preferred Stock only when such Units first become 
deliverable.  Prior to the exercise of the Rights evidenced thereby, the 
holder of a Rights Certificate shall not be entitled to any rights of a 
stockholder of the Company with respect to securities for which the Rights 
shall be exercisable, including, without limitation, the right to vote, to 
receive dividends or other distributions or to exercise any preemptive 
rights, and shall 


                                      12.
<PAGE>

not be entitled to receive any notice of any proceedings of the Company, 
except as provided herein.  Prior to the exercise of the Rights evidenced 
thereby, the holder of a Rights Certificate shall not be entitled to any 
rights of a holder of a Unit of Preferred Stock for which the Rights shall be 
exercisable, including, without limitation, the right to vote, to receive 
dividends or other distributions or to exercise any preemptive rights, and 
shall not be entitled to receive any notice of any proceedings of the 
Company, except as provided herein.

              Section 11.   ADJUSTMENT OF PURCHASE PRICE, NUMBER OF SHARES OR 
NUMBER OF RIGHTS.  The Purchase Price, the number and kinds of securities 
covered by each Right and the number of Rights outstanding are subject to 
adjustment from time to time as provided in this Section 11.

              (a)    (i)    In the event the Company shall at any time after 
the date of this Agreement (A) declare a dividend on the Preferred Stock 
payable in shares of Preferred Stock, (B) subdivide the outstanding shares of 
Preferred Stock, (C) combine the outstanding Preferred Stock into a smaller 
number of shares of Preferred Stock or (D) issue any shares of its capital 
stock in a reclassification of the Preferred Stock (including any such 
reclassification in connection with a consolidation or merger in which the 
Company is the continuing or surviving corporation), except as otherwise 
provided in this Section 11(a), the Purchase Price in effect at the time of 
the record date for such dividend or of the effective date of such 
subdivision, combination or reclassification, and the number and kind of 
shares of capital stock issuable on such date, shall be proportionately 
adjusted so that the holder of any Rights exercised after such time shall be 
entitled to receive the aggregate number and kind of shares of capital stock 
which, if such Rights had been exercised immediately prior to such date and 
at a time when the Preferred Stock transfer books of the Company were open, 
such holder would have owned upon such exercise and been entitled to receive 
by virtue of such dividend, subdivision, combination or reclassification; 
PROVIDED, HOWEVER, that in no event shall the consideration to be paid upon 
the exercise of one Right be less than the aggregate par value of the shares 
of capital stock of the Company issuable upon exercise of one Right. If an 
event occurs which would require an adjustment under both this Section 
11(a)(i) and Section 11(a)(ii), the adjustment provided for in this Section 
11(a)(i) shall be in addition to, and shall be made prior, to any adjustment 
required pursuant to Section 11(a)(ii).

                     (ii)   Subject to Section 24 of this Agreement, in the
       event that (A) any Acquiring Person or any Associate or Affiliate of any
       Acquiring Person, at any time after the date of this Agreement, directly
       or indirectly, shall (1) merge into the Company or otherwise combine with
       the Company and the Company shall be the continuing or surviving
       corporation of such merger or combination and shares of Company Common
       Stock shall remain outstanding and unchanged, (2) in one transaction or a
       series of transactions, transfer any assets to the Company or any of its
       Subsidiaries in exchange (in whole or in part) for shares of Company
       Common Stock, for other equity securities of the Company or any such
       Subsidiary, or for securities exercisable for or convertible into shares
       of equity securities of the Company or any of its Subsidiaries (whether
       shares of Company Common Stock or otherwise) or otherwise obtain from the
       Company or any of its Subsidiaries, with or without consideration, any
       additional shares of such equity securities or securities exercisable for
       or convertible into such equity securities other than pursuant to a pro
       rata distribution to all holders of shares of Company Common Stock, 


                                      13.
<PAGE>

       (3) sell, purchase, lease, exchange, mortgage, pledge, transfer or 
       otherwise acquire or dispose of, in one transaction or a series of 
       transactions, to, from or with the Company or any of its Subsidiaries or 
       any employee benefit plan maintained by the Company or any of its 
       Subsidiaries or any trustee or fiduciary with respect to such plan acting
       in such capacity, assets (including securities) on terms and conditions 
       less favorable to the Company or such Subsidiary or plan than those that 
       could have been obtained in arm's-length negotiations with an 
       unaffiliated third party, other than pursuant to a transaction set forth 
       in Section 13(a) hereof, (4) sell, purchase, lease, exchange, mortgage, 
       pledge, transfer or otherwise acquire or dispose of, in one transaction 
       or a series of transactions, to, from or with the Company or any of its 
       Subsidiaries or any employee benefit plan maintained by the Company or 
       any of its Subsidiaries or any trustee or fiduciary with respect to such 
       plan acting in such capacity (other than transactions, if any, consistent
       with those engaged in, as of the date hereof, by the Company and such 
       Acquiring Person or such Associate or Affiliate), 50% or more of the 
       Company's assets (including securities or intangible assets) other than 
       pursuant to a transaction set forth in Section 13(a) hereof, (5)  
       receive, or any designee, agent or representative of such Acquiring 
       Person or any Affiliate or Associate of such Acquiring Person shall 
       receive, any compensation from the Company or any of its Subsidiaries 
       other than compensation for full-time employment as a regular employee at
       rates in accordance with the Company's (or its Subsidiaries') past 
       practices, or (6) receive the benefit, directly or indirectly (except 
       proportionately as a holder of shares of Company Common Stock or as 
       required by law or governmental regulation), of any loans, advances, 
       guarantees, pledges or other financial assistance or any tax credits or 
       other tax advantages provided by the Company or any of its Subsidiaries 
       or any employee benefit plan maintained by the Company or any of its 
       Subsidiaries or any trustee or fiduciary with respect to such plan acting
       in such capacity; or (B) any Person shall become an Acquiring Person, 
       unless the event causing the Person to become an Acquiring Person is a 
       transaction set forth in Section 13(a); or (C) during such time as there 
       is an Acquiring Person, there shall be any reclassification of securities
       (including any reverse stock split), or recapitalization of the Company, 
       or any merger or consolidation of the Company with any of its 
       Subsidiaries or any other transaction or series of transactions involving
       the Company or any of its Subsidiaries, other than a transaction or 
       transactions to which the provisions of Section 13(a) apply (whether or 
       not with or into or otherwise involving an Acquiring Person), which has 
       the effect, directly or indirectly, of increasing by more than 1% the 
       proportionate share of the outstanding shares of any class of equity 
       securities of the Company or any of its Subsidiaries that is directly or 
       indirectly beneficially owned by any Acquiring Person or any Person or 
       any Associate or Affiliate of any Acquiring Person;
       
then promptly following the occurrence of an event described in Section 
11(a)(ii)(A), (B) or (C) (a "Section 11(a)(ii) Event"), proper provision 
shall be made so that each holder of a Right, except as provided in Section 
7(e) hereof, shall thereafter have the right to receive for each Right, upon 
exercise thereof in accordance with the terms of this Agreement and payment 
of the then-current Purchase Price, in lieu of the number of Units of 
Preferred Stock for which a Right was exercisable immediately prior to the 
first occurrence of a Section 11(a)(ii) Event, such number of Units of 
Preferred Stock as shall equal the result obtained by multiplying the 
then-current Purchase Price by the then number of Units of Preferred Stock 
for which a Right was 


                                      14.
<PAGE>

exercisable (or would have been exercisable if the Distribution Date had 
occurred) immediately prior to the first occurrence of a Triggering Event, 
and dividing that product by 50% of the current per share market price 
(determined pursuant to Section 11(d) hereof) for shares of Common Stock on 
the date of occurrence of the Triggering Event (such number of Units of 
Preferred Stock being hereinafter referred to as the "Adjustment Shares").

                     (iii)  In the event that the number of Units of Preferred
       Stock which are authorized by the Company's Amended and Restated
       Certificate of Incorporation but not outstanding or reserved for issuance
       for purposes other than upon exercise of the Rights are not sufficient to
       permit the exercise in full of the Rights, or if any necessary regulatory
       approval for such issuance has not been obtained by the Company, the
       Company shall, in lieu of issuing Units of Preferred Stock in accordance
       with Section 11(a)(ii) hereof, upon approval by a majority of the
       Directors: (A) determine the excess of (1) the value of the Units of
       Preferred Stock issuable upon the exercise of a Right (the "Current
       Value") over (2) the Purchase Price (such excess being referred to as the
       "Spread") and (B) with respect to each Right, make adequate provision to
       substitute for such Units of Preferred Stock, upon exercise of the
       Rights, (1) cash, (2) a reduction in the Purchase Price, (3) other equity
       securities of the Company (including, without limitation, Common Stock or
       shares or units of shares of any series of preferred stock which the
       Board of Directors of the Company has deemed to have the same value as
       the Units of Preferred Stock (such shares or units of preferred stock are
       herein called "preferred stock equivalents")), except to the extent that
       the Company has not obtained any necessary regulatory approval for such
       issuance, (4) debt securities of the Company, except to the extent that
       the Company has not obtained any necessary regulatory approval for such
       issuance, (5) other assets or (6) any combination of the foregoing,
       having an aggregate value equal to the Current Value, where such
       aggregate value has been determined by the Board of Directors of the
       Company based upon the advice of a nationally recognized investment
       banking firm selected by the Board of Directors of the Company; PROVIDED,
       HOWEVER, if the Company shall not have made adequate provision to deliver
       value pursuant to clause (B) above within thirty (30) days following the
       later of (x) occurrence of a Section 11(a)(ii) Event, and (y) the date on
       which the Company's right of redemption pursuant to Section 23(a) expires
       (the later of (x) and (y) being referred to herein as the "Section
       11(a)(iii) Trigger Date"), then the Company shall be obligated to
       deliver, upon the surrender for exercise of a Right and without requiring
       payment of the Purchase Price, Units of Preferred Stock (to the extent
       available), except to the extent that the Company has not obtained any
       necessary regulatory approval for such issuance, and then, if necessary,
       cash, which Units and/or cash have an aggregate value equal to the
       Spread. 

              (b)    In the event that the Company shall fix a record date 
for the issuance of rights, options or warrants to all holders of Units of 
Preferred Stock entitling them (for a period expiring within 45 calendar days 
after such record date) to subscribe for or purchase Units of Preferred Stock 
(or shares having the same rights, privileges and preferences as the 
Preferred Stock ("equivalent preferred stock")) or securities convertible 
into Units of Preferred Stock or equivalent preferred stock at a price per 
Unit of Preferred Stock or equivalent preferred stock (or having a conversion 
price per share, if a security convertible into Units of Preferred Stock or 
equivalent preferred stock) less than the then current per share market price 
of a Unit of 


                                      15.
<PAGE>

Preferred Stock (as determined pursuant to Section 11(d)) on such record 
date, the Purchase Price to be in effect after such record date shall be 
determined by multiplying the Purchase Price in effect immediately prior to 
such record date by a fraction, the numerator of which shall be the number of 
Units of Preferred Stock outstanding on such record date plus the number of 
Units of Preferred Stock which the aggregate offering price of the total 
number of Units of Preferred Stock and/or equivalent preferred stock so to be 
offered (and/or the aggregate initial conversion price of the convertible 
securities so to be offered) would purchase at such current market price and 
the denominator of which shall be the number of Units of Preferred Stock 
outstanding on such record date plus the number of additional Units of 
Preferred Stock and/or equivalent preferred stock to be offered for 
subscription or purchase (or into which the convertible securities so to be 
offered are initially convertible).  In case such subscription price may be 
paid in a consideration part or all of which shall be in a form other than 
cash, the value of such consideration shall be as determined in good faith by 
a majority of the Directors of the Company, whose determination shall be 
described in a statement filed with the Rights Agent and shall be binding on 
the Rights Agent and the holders of the Rights.  Units of Preferred Stock 
owned by or held for the account of the Company shall not be deemed 
outstanding for the purpose of any such computation.  Such adjustment shall 
be made successively whenever such a record date is fixed; and in the event 
that such rights, options or warrants are not so issued, the Purchase Price 
shall be adjusted to be the Purchase Price which would then be in effect if 
such record date had not been fixed.

              (c)    In case the Company shall fix a record date for a 
distribution to all holders of Units of Preferred Stock (including any such 
distribution made in connection with a consolidation or merger in which the 
Company is the continuing or surviving corporation) of evidences of 
indebtedness, cash (other than a regular quarterly cash dividend) assets 
(other than a dividend payable in Units of Preferred Stock but including any 
dividend payable in equity securities other than Preferred Stock) or 
subscription rights or warrants (excluding those referred to in Section 11(d) 
hereof), the Purchase Price to be in effect after such record date shall be 
determined by multiplying the Purchase Price in effect immediately prior to 
such record date by a fraction, the numerator of which shall be the then 
current per share market price (as determined pursuant to Section 11(d)) of 
the Preferred Stock on such record date, less the fair market value (as 
determined in good faith by a majority of the Directors of the Company, whose 
determination shall be described in a statement filed with the Rights Agent 
and shall be binding on the Rights Agent and the holder of Rights) of the 
cash, assets or evidences of indebtedness to be distributed or of such 
subscription rights or warrants distributable in respect of a share of 
Preferred Stock and the denominator of which shall be such current per share 
market price (as determined pursuant to Section 11(d)) of a share of 
Preferred Stock.  Such adjustments shall be made successively whenever such a 
record date is fixed; and in the event that such distribution is not so made, 
the Purchase Price shall again be adjusted to be the Purchase Price which 
would then be in effect if such record date had not been fixed.

              (d)    (i)    For the purpose of any computation hereunder, the 
"current per share market price" of any security (a "Security" for the 
purpose of this Section 11(d)(i)) on any date shall be deemed to be the 
average of the daily closing prices per share of such Security for the thirty 
(30) consecutive Trading Days (as such term is hereinafter defined) 
immediately prior to such date; PROVIDED, HOWEVER, that in the event that the 
"current per share market price" of the 


                                      16.
<PAGE>

Security is determined during a period following the announcement by the 
issuer of such Security of (A) a dividend or distribution on such Security 
payable in shares of such Security or securities convertible into such 
shares, or (B) any subdivision, combination or reclassification of such 
Security and prior to the expiration of thirty (30) Trading Days after the 
ex-dividend date for such dividend or distribution, or the record date for 
such subdivision, combination or reclassification, then, and in each such 
case, the "current per share market price" shall be appropriately adjusted to 
reflect the "current market price" per share equivalent of such Security.  
The closing price for each day shall be the last sale price, regular way, or, 
in case no such sale takes place on such day, the average of the closing bid 
and asked prices, regular way, in either case as reported in the principal 
consolidated transaction reporting system with respect to securities listed 
or admitted to trading on the Nasdaq National Market System ("Nasdaq") or, if 
the Security is not listed or admitted to trading on the Nasdaq, as reported 
in the principal consolidated transaction reporting system with respect to 
securities listed on the principal national securities exchange on which the 
Security is listed or admitted to trading or, if the Security is not listed 
or admitted to trading on any national securities exchange, the last quoted 
price or, if not so quoted, the average of the high bid and low asked prices 
in the over-the-counter market, as reported by the Nasdaq or such other 
system then in use, or, if on any such date the Security is not quoted by any 
such organization, the average of the closing bid and asked prices as 
furnished by a professional market maker making a market in the Security 
selected by a majority of the Directors.  If on any such date no market maker 
is making a market in the Security, the "current per share market price" of 
such Security on such date as determined in good faith by the Board of 
Directors of the Company as provided for below shall be used.  The term 
"Trading Day" shall mean a day on which the principal national securities 
exchange on which the Security is listed or admitted to trading is open for 
the transaction of business or, if the Security is not listed or admitted to 
trading on any national securities exchange, a Business Day.

                     (ii)   For the purpose of any computation hereunder, the
       "current per share market price" of the Preferred Stock shall be
       determined in accordance with the method set forth in Section 11(d)(i). 
       If the "current per share market price" of the Preferred Stock cannot be
       determined in the manner provided above or if the Preferred Stock is not
       publicly held or listed or traded in a manner described in clause (i) of
       this Section 11(d), the "current per share market price" of the Preferred
       Stock shall be conclusively deemed to be an amount equal to 1,000 (as
       such amount may be appropriately adjusted for such events as stock
       splits, stock dividends and recapitalizations with respect to shares of
       Company Common Stock occurring after the date of this Agreement)
       multiplied by the current market price per share of Company Common Stock.
       If shares of neither the Company Common Stock nor Preferred Stock is
       publicly held or so listed or traded, "current per share market price" of
       the Preferred Stock shall mean the fair value per share as determined in
       good faith by the Board of Directors of the Company, whose determination
       shall be described in a statement filed with the Rights Agent and shall
       be binding on the Rights Agent and the holders of the Rights.

              (e)    No adjustment in the Purchase Price shall be required 
unless such adjustment would require an increase or decrease of at least 1% 
in the Purchase Price; PROVIDED, HOWEVER, that any adjustments which by 
reason of this Section 11(e) are not required to be made 


                                      17.
<PAGE>

shall be carried forward and taken into account in any subsequent adjustment. 
All calculations under this Section 11 shall be made to the nearest cent or 
to the nearest one one-thousandth of a share of Preferred Stock or one 
one-hundredth of any other share or security as the case may be.  
Notwithstanding the first sentence of this Section 11(e), any adjustment 
required by this Section 11 shall be made no later than the earlier of (i) 
three years from the date of the transaction which requires such adjustment 
or (ii) the Expiration Date.

              (f)    If as a result of an adjustment made pursuant to Section 
11(a)(ii) hereof, the holder of any Rights thereafter exercised shall become 
entitled to receive any shares of capital stock of the Company other than 
Units of Preferred Stock, thereafter the number of such other shares so 
receivable upon exercise of any Rights and the Purchase Price thereof shall 
be subject to adjustment from time to time in a manner and on terms as nearly 
equivalent as practicable to the provisions with respect to the Preferred 
Stock contained in Section 11(a), (b), (c), (d), (e), (g), (h), (i), (j), 
(k), (l) and (m), and the provisions of Sections 7, 9, 10, 13 and 14 with 
respect to the Preferred Stock shall apply on like terms to any such other 
shares.

              (g)    All Rights originally issued by the Company subsequent 
to any adjustment made to the Purchase Price hereunder shall evidence the 
right to purchase, at the adjusted Purchase Price, the number of Units of 
Preferred Stock purchasable from time to time hereunder upon exercise of the 
Rights, all subject to further adjustment as provided herein.

              (h)    Unless the Company shall have exercised its election as 
provided in Section 11(i), upon each adjustment of the Purchase Price as a 
result of the calculations made in Sections 11(b) and (c), each Right 
outstanding immediately prior to the making of such adjustment shall 
thereafter evidence the right to purchase, at the adjusted Purchase Price, 
that number of Units of Preferred Stock (calculated to the nearest 
one-millionth of a share of Preferred Stock) obtained by dividing (i) the 
product obtained by multiplying (x) the number of Units of Preferred Stock 
covered by a Right immediately prior to this adjustment by (y) the Purchase 
Price in effect immediately prior to such adjustment of the Purchase Price 
by, (ii) the Purchase Price in effect immediately after such adjustment of 
the Purchase Price.

              (i)    The Company may elect on or after the date of any 
adjustment of the Purchase Price to adjust the number of Rights, in 
substitution for any adjustment in the number of Units of Preferred Stock 
purchasable upon the exercise of a Right.  Each of the Rights outstanding 
after such adjustment of the number of Rights shall be exercisable for the 
number of Units of Preferred Stock for which a Right was exercisable 
immediately prior to such adjustment.  Each Right held of record prior to 
such adjustment of the number of Rights shall become that number of Rights 
(calculated to the nearest one-thousandth) obtained by dividing the Purchase 
Price in effect immediately prior to adjustment of the Purchase Price by the 
Purchase Price in effect immediately after adjustment of the Purchase Price.  
The Company shall make a public announcement of its election to adjust the 
number of Rights, indicating the record date for the adjustment, and, if 
known at the time, the amount of the adjustment to be made.  This record date 
may be the date on which the Purchase Price is adjusted or any day 
thereafter, but, if the Rights Certificates have been issued, shall be at 
least ten days later than the date of the public announcement.  If Rights 
Certificates have been issued, upon each adjustment of the number of Rights 
pursuant to this Section 11(i), the Company shall, as promptly as 
practicable, cause to be distributed to holders of record of Rights 
Certificates on such record date Rights 


                                      18.
<PAGE>

Certificates evidencing, subject to Section 14 hereof, the additional Rights 
to which such holders shall be entitled as a result of such adjustment, or, 
at the option of the Company, shall cause to be distributed to such holders 
of record in substitution and replacement for the Rights Certificates held by 
such holders prior to the date of adjustment, and upon surrender thereof, if 
required by the Company, new Rights Certificates evidencing all the Rights to 
which such holders shall be entitled after such adjustment.  Rights 
Certificates to be so distributed shall be issued, executed and countersigned 
in the manner provided for herein and shall be registered in the names of the 
holders of record of Rights Certificates on the record date specified in the 
public announcement.

              (j)    Irrespective of any adjustment or change in the Purchase 
Price or the number of Units of Preferred Stock issuable upon the exercise of 
the Rights, the Rights Certificates theretofore and thereafter issued may 
continue to express the Purchase Price per Unit and the number of Units of 
Preferred Stock which were expressed in the initial Rights Certificates 
issued hereunder.

              (k)    Before taking any action that would cause an adjustment 
reducing the Purchase Price below the then par value of the number of Units 
of Preferred Stock issuable upon exercise of the Rights, the Company shall 
take any corporate action which may, in the opinion of its counsel, be 
necessary in order that the Company may validly and legally issue fully paid 
and nonassessable number of Units of Preferred Stock at such adjusted 
Purchase Price.

              (l)    In any case in which this Section 11 shall require that 
an adjustment in the Purchase Price be made effective as of a record date for 
a specified event, the Company may elect to defer until the occurrence of 
such event the issuing to the holder of any Rights exercised after such 
record date of that number of Units of Preferred Stock and other capital 
stock or securities of the Company, if any, issuable upon such exercise over 
and above the Units of Preferred Stock and other capital stock or securities 
of the Company, if any, issuable upon such exercise on the basis of the 
Purchase Price in effect prior to such adjustment; PROVIDED, HOWEVER, that 
the Company shall deliver to such holder a due bill or other appropriate 
instrument evidencing such holder's right to receive such additional shares 
(fractional or otherwise) upon the occurrence of the event requiring such 
adjustment.

              (m)    Anything in this Section 11 to the contrary 
notwithstanding, the Company shall be entitled to make such reductions in the 
Purchase Price, in addition to those adjustments expressly required by this 
Section 11, as and to the extent that it in its sole discretion shall 
determine to be advisable in order that any (i) consolidation or subdivision 
of the Preferred Stock, (ii) issuance wholly for cash of any Unit of 
Preferred Stock at less than the current market price, (iii) issuance wholly 
for cash of Preferred Stock or securities which by their terms are 
convertible into or exchangeable for Preferred Stock, (iv) dividends on 
Preferred Stock payable in Preferred Stock or (v) issuance of rights, options 
or warrants referred to in this Section 11, hereafter made by the Company to 
holders of Units of its Preferred Stock shall not be taxable to such 
stockholders.

              (n)    The Company shall not, at any time after the 
Distribution Date, (i) consolidate with any other Person (other than a 
Subsidiary of the Company in a transaction which complies with Section 
11(o)), (ii) merge with or into any other Person (other than a Subsidiary of 
the Company in a transaction which complies with Section 11(o)), or (iii) 
sell or 


                                      19.
<PAGE>

transfer (or permit any Subsidiary to sell or transfer), in one transaction, 
or a series of transactions, assets or earning power aggregating more than 
50% of the assets or earning power of the Company and its Subsidiaries (taken 
as a whole) to any other Person or Persons (other than the Company and/or any 
of its Subsidiaries in one or more transactions each of which complies with 
Section 11(o)), if (x) at the time of or immediately after such 
consolidation, merger or sale there are any rights, warrants or other 
instruments or securities outstanding or agreements in effect which would 
substantially diminish or otherwise eliminate the benefits intended to be 
afforded by the Rights or (y) prior to, simultaneously with or immediately 
after such consolidation, merger or sale, the Person which constitutes, or 
would constitute the "Principal Party" for purposes of Section 13(a) shall 
have distributed or otherwise transferred to its stockholders or other 
persons holding an equity interest in such Person Rights previously owned by 
such Person or any of its Affiliates and Associates; PROVIDED, HOWEVER, this 
Section 11(n) shall not affect the ability of any Subsidiary of the Company 
to consolidate with, merge with or into, or sell or transfer assets or 
earning power to, any other Subsidiary of the Company.

              (o)    After the Distribution Date, the Company shall not, 
except as permitted by Sections 23, 24 or 27, take (or permit any Subsidiary 
to take) any action if at the time such action is taken it is reasonably 
foreseeable that such action will diminish substantially or otherwise 
eliminate the benefits intended to be afforded by the Rights.

              (p)    In the event that, at any time after the date of this 
Agreement and prior to the Distribution Date, the Company shall (i) declare 
or pay any dividend on outstanding shares of Common Stock payable in shares 
of Common Stock or (ii) effect a subdivision, combination or consolidation of 
the Common Stock (by reclassification or otherwise than by payment of 
dividends in shares of Common Stock) into a greater or lesser number of 
shares of Common Stock, then in any such case the number of Units of 
Preferred Stock purchasable after such event upon proper exercise of each 
Right shall be determined by multiplying the number of Units of Preferred 
Stock so purchasable immediately prior to such event by a fraction, the 
numerator of which is the number of shares of Common Stock outstanding 
immediately before such event and the denominator of which is the number of 
shares of Common Stock outstanding immediately after such event.  The 
adjustments provided for in this Section 11(p) shall be made successively 
whenever such a dividend is declared or paid or such a subdivision, 
combination or consolidation is effected.

              Section 12.   CERTIFICATE OF ADJUSTED PURCHASE PRICE OR NUMBER 
OF SHARES. Whenever an adjustment is made as provided in Sections 11 and 13 
hereof, the Company shall promptly (a) prepare a certificate setting forth 
such adjustment, and a brief statement of the facts accounting for such 
adjustment, (b) file with the Rights Agent and with each transfer agent for 
the shares of Common Stock or Units of Preferred Stock a copy of such 
certificate and (c) mail a brief summary thereof to each holder of a Rights 
Certificate in accordance with Section 25 hereof.  Notwithstanding the 
foregoing sentence, the failure by the Company to make such certification or 
give such notice shall not affect the validity of or the force or effect of 
the requirement for such adjustment.  The Rights Agent shall be fully 
protected in relying on any such certificate and on any adjustment contained 
therein and shall not be deemed to have knowledge of such adjustment unless 
and until it shall have received such certificate.


                                      20.
<PAGE>

              Section 13.   CONSOLIDATION, MERGER OR SALE OR TRANSFER OF 
ASSETS OR EARNING POWER.  

              (a)    Except as provided in Section 13(b) hereof, in the event 
that, following a Shares Acquisition Date, directly or indirectly, (x) the 
Company shall consolidate with, or merge with and into, any other Person 
(other than a Subsidiary of the Company in a transaction which complies with 
Section 11(o)), and the Company shall not be the continuing or surviving 
corporation of such consolidation or merger, (y) any Person (other than a 
Subsidiary of the Company in a transaction which complies with Section 11(o)) 
shall consolidate with the Company, or merge with and into the Company and 
the Company shall be the continuing or surviving corporation of such 
consolidation or merger and, in connection with such consolidation or merger, 
all or part of the shares of Common Stock shall be changed into or exchanged 
for stock or other securities of any other Person or cash or any other 
property, or (z) the Company shall sell or otherwise transfer (or one or more 
of its Subsidiaries shall sell or otherwise transfer) to any Person or 
Persons (other than a Subsidiary of the Company in a transaction which 
complies with Section 11(o)), in one or more transactions, directly or 
indirectly, assets or earning power aggregating 50% or more of the assets or 
earning power of the Company and its Subsidiaries (taken as a whole)(any such 
event being a "Section 13 Event"), then, and in each such case, proper 
provision shall be made so that:  (i) each holder of a Right, except as 
provided in Section 7(e), shall thereafter have the right to receive, upon 
the exercise thereof at the then current Purchase Price, such number of 
validly authorized and issued, fully paid and non-assessable shares of Common 
Stock of the Principal Party (as such term is hereinafter defined), which 
shares shall not be subject to any liens, encumbrances, rights of first 
refusal, transfer restrictions or other adverse claims, as shall be equal to 
the result obtained by (1) multiplying the then current Purchase Price by the 
number of Units of Preferred Stock for which a Right is exercisable 
immediately prior to the first occurrence of a Section 13 Event (or, if a 
Section 11(a)(ii) Event has occurred prior to the first occurrence of a 
Section 13 Event, multiplying the number of such Units of Preferred Stock for 
which a Right would be exercisable hereunder but for the occurrence of such 
Section 11(a)(ii) Event by the Purchase Price which would be in effect 
hereunder but for such first occurrence) and (2) dividing that product 
(which, following the direct occurrence of a Section 13 Event, shall be the 
"Purchase Price" for all purposes of this Agreement) by 50% of the current 
per share market price (determined pursuant to Section 11(d)) of the shares 
of Common Stock of such Principal Party on the date of consummation of such 
Section 13 Event; (ii) such Principal Party shall thereafter be liable for, 
and shall assume, by virtue of such Section 13 Event, all the obligations and 
duties of the Company pursuant to this Agreement; (iii) the term "Company" 
shall, for all purposes of this Agreement, thereafter be deemed to refer to 
such Principal Party, it being specifically intended that the provisions of 
Section 11 shall apply only to such Principal Party following the first 
occurrence of a Section 13 Event; (iv) such Principal Party shall take such 
steps (including, but not limited to, the reservation of a sufficient number 
of shares of its Common Stock) in connection with the consummation of any 
such transaction as may be necessary to ensure that the provisions of this 
Agreement shall thereafter be applicable to its shares of Common Stock 
thereafter deliverable upon the exercise of the Rights; and (v) the 
provisions of Section 11(a)(ii) shall be of no further effect following the 
first occurrence of any Section 13 Event.


                                      21.
<PAGE>

              (b)    "Principal Party" shall mean:

              (i)    in the case of any transaction described in clause (x)
       or (y) of the first sentence of Section 13(a), (A) the Person that is the
       issuer of any securities into which shares of Company Common Stock are
       converted in such merger or consolidation, or, if there is more than one
       such issuer, the issuer of shares of Common Stock that has the highest
       aggregate current market price (determined pursuant to Section 11(d)) and
       (B) if no securities are so issued, the Person that is the other party to
       such merger or consolidation, or, if there is more than one such Person,
       the Person the Common Stock of which has the highest aggregate current
       market price (determined pursuant to Section 11(d)); and

              (ii)   in the case of any transaction described in clause (z) of
       the first sentence of Section 13(a), the Person that is the party
       receiving the largest portion of the assets or earning power transferred
       pursuant to such transaction or transactions, or, if each Person that is
       a party to such transaction or transactions receives the same portion of
       the assets or earning power transferred pursuant to such transaction or
       transactions or if the Person receiving the largest portion of the assets
       or earning power cannot be determined, whichever Person the Common Stock
       of which has the highest aggregate current market price (determined
       pursuant to Section 11(d)); PROVIDED, HOWEVER, that in any such case,
       (1) if the Common Stock of such Person is not at such time and has not
       been continuously over the preceding twelve-month period registered under
       Section 12 of the Exchange Act ("Registered Common Stock"), or such
       Person is not a corporation, and such Person is a direct or indirect
       Subsidiary of another Person that has Registered Common Stock
       outstanding, "Principal Party" shall refer to such other Person; (2) if
       the Common Stock of such Person is not Registered Common Stock or such
       Person is not a corporation, and such Person is a direct or indirect
       Subsidiary of another Person but is not a direct or indirect Subsidiary
       of another Person which has Registered Common Stock outstanding,
       "Principal Party" shall refer to the ultimate parent entity of such
       first-mentioned Person; (3) if the Common Stock of such Person is not
       Registered Common Stock or such Person is not a corporation, and such
       Person is directly or indirectly controlled by more than one Person, and
       one or more of such other Persons has Registered Common Stock
       outstanding, "Principal Party" shall refer to whichever of such other
       Persons is the issuer of the Registered Common Stock having the highest
       aggregate current per share market price (determined pursuant to Section
       11(d)); and (4) if the Common Stock of such Person is not Registered
       Common Stock or such Person is not a corporation, and such Person is
       directly or indirectly controlled by more than one Person, and none of
       such other Persons has Registered Common Stock outstanding, "Principal
       Party" shall refer to whichever ultimate parent entity is the corporation
       having the greatest stockholders' equity or, if no such ultimate parent
       entity is a corporation, shall refer to whichever ultimate parent entity
       is the entity having the greatest net assets.

              (c)    The Company shall not consummate any such consolidation, 
merger, sale or transfer unless the Principal Party shall have a sufficient 
number of authorized shares of Common Stock which have not been issued or 
reserved for issuance to permit the exercise in full of the Rights in 
accordance with this Section 13, and unless prior thereto the Company and 
such Principal Party shall have executed and delivered to the Rights Agent a 
supplemental agreement 


                                      22.
<PAGE>


providing for the terms set forth in paragraphs (a) and (b) of this Section 
13 and further providing that the Principal Party will:

            (i)      (A)    file on an appropriate form, as soon as practicable
       following the execution of such agreement, a registration statement under
       the Securities Act with respect to the shares of Common Stock that may be
       acquired upon exercise of the Rights, (B) cause such registration
       statement to remain effective (and to include a prospectus complying with
       the requirements of the Securities Act) until the Expiration Date, and
       (C) as soon as practicable following the execution of such agreement take
       such action as may be required to ensure that any acquisition of such
       shares of Common Stock upon the exercise of the Rights complies with any
       applicable state securities or "blue sky" laws; and

            (ii)     deliver to holders of the Rights historical financial
       statements for the Principal Party and each of its Affiliates which
       comply in all respects with the requirements for registration on Form 10
       under the Exchange Act.

              (d)    In case the Principal Party which is to be a party to a 
transaction referred to in this Section 13 has a provision in any of its 
authorized securities or in its Certificate of Incorporation or Bylaws or 
other instrument governing its corporate affairs, which provision would have 
the effect of (i) causing such Principal Party to issue, in connection with, 
or as a consequence of, the consummation of a transaction referred to in this 
Section 13, shares of Common Stock of such Principal Party at less than the 
then current market price per share (determined pursuant to Section 11(d)) or 
securities exercisable for, or convertible into, shares of Common Stock of 
such Principal Party at less than such then current marker price (other than 
to holders of Rights pursuant to this Section 13) or (ii) providing for any 
special payment, tax or similar provisions in connection with the issuance of 
the shares of Common Stock of such Principal Party pursuant to the provisions 
of this Section 13, then, in such event, the Company shall not consummate any 
such transaction unless prior thereto the Company and such Principal Party 
shall have executed and delivered to the Rights Agent a supplemental 
agreement providing that the provision in question of such Principal Party 
shall have been cancelled, waived or amended, or that the authorized 
securities shall be redeemed, so that the applicable provision will have no 
effect in connection with, or as a consequence of, the consummation of the 
proposed transaction.

              (e)    The provisions of this Section 13 shall similarly apply 
to successive mergers or consolidations or sales or other transfers. In the 
event that a Section 13 Event shall occur at any time after the occurrence of 
a Section 11(a)(ii) Event, the Rights which have not theretofore been 
exercised shall thereafter become exercisable in the manner described in 
Section 13(a).

              Section 14.   FRACTIONAL RIGHTS AND FRACTIONAL SHARES.  

              (a)    The Company shall not be required to issue fractions of 
Rights or to distribute Rights Certificates which evidence fractional Rights. 
In lieu of such fractional Rights, there shall be paid to the registered 
holders of the Rights Certificates with regard to which such fractional 
Rights would otherwise be issuable, an amount in cash equal to the same 
fraction of 


                                      23.
<PAGE>

the current market value of a whole Right.  For the purposes of this Section 
14(a), the current market value of a whole Right shall be the closing price 
of the Rights for the Trading Day immediately prior to the date on which such 
fractional Rights would have been otherwise issuable.  The closing price for 
any day shall be the last sale price, regular way, or, in case no such sale 
takes place on such day, the average of the closing bid and asked prices, 
regular way, in either case as reported in the principal consolidated 
transaction reporting system with respect to securities listed or admitted to 
trading on the Nasdaq or, if the Rights are not listed or admitted to trading 
on the Nasdaq, as reported in the principal consolidated transaction 
reporting system with respect to securities listed on the principal national 
securities exchange on which the Rights are listed or admitted to trading or, 
if the Rights are not listed or admitted to trading on any national 
securities exchange, the last quoted price or, if not so quoted, the average 
of the high bid and low asked prices in the over-the-counter market, as 
reported by Nasdaq or such other system then in use or, if on any such date 
the Rights are not quoted by any such organization, the average of the 
closing bid and asked prices as furnished by a professional market maker 
making a market in the Rights selected by the Directors.  If on any such date 
no such market maker is making a market in the Rights, the fair value of the 
Rights on such date as determined in good faith by the Board of Directors of 
the Company shall be used.

              (b)    The Company shall not be required to issue fractions of 
Preferred Stock (other than fractions which are integral multiples of one 
one-thousandth of a share of Preferred Stock) upon exercise of the Rights or 
to distribute certificates which evidence fractional Preferred Stock (other 
than fractions which are integral multiples of one one-thousandth of a share 
of Preferred Stock).  Fractions of Preferred Stock in integral multiples of 
one one-thousandth of a share of Preferred Stock may, at the election of the 
Company, be evidenced by depositary receipts, pursuant to an appropriate 
agreement between the Company and a depositary selected by it; PROVIDED, 
HOWEVER, that such agreement shall provide that the holders of such 
depositary receipts shall have all the rights, privileges and preferences to 
which they are entitled as beneficial owners of the Preferred Stock 
represented by such depositary receipts.  In lieu of fractional shares of 
Preferred Stock that are not integral multiples of one one-thousandth of a 
share of Preferred Stock, the Company shall pay to the registered holders of 
Rights Certificates at the time such Rights are exercised as herein provided 
an amount in cash equal to the same fraction of the current market value of a 
share of Preferred Stock as determined pursuant to Section 11(d).

              (c)    The holder of a Right by the acceptance of the Right 
expressly waives such holder's right to receive any fractional Rights or any 
fractional shares upon exercise of a Right (except as provided above).

              Section 15.   RIGHTS OF ACTION.  All rights of action in 
respect of this Agreement, excepting the rights of action given to the Rights 
Agent under Section 18 hereof, are vested in the respective registered 
holders of the Rights Certificates (and, prior to the Distribution Date, the 
registered holders of certificates representing shares of Common Stock); and 
any registered holder of any Rights Certificate (or, prior to the 
Distribution Date, a certificate representing shares of Common Stock), 
without the consent of the Rights Agent or of the holder of any other Rights 
Certificate (or, prior to the Distribution Date, of a certificate 
representing shares of Common Stock), may, in such holder's own behalf and 
for such holder's own benefit, enforce, and may institute and maintain any 
suit, action or proceeding against the Company to enforce, or 


                                      24.
<PAGE>

otherwise act in respect of, such holder's right to exercise the Rights 
evidenced by such Rights Certificate in the manner provided in such Rights 
Certificate and in this Agreement.  Without limiting the foregoing or any 
remedies available to the holders of Rights, it is specifically acknowledged 
that the holders of Rights would not have an adequate remedy at law for any 
breach of this Agreement and will be entitled to specific performance of the 
obligations hereunder, and injunctive relief against actual or threatened 
violations of the obligations of any Person subject to this Agreement.

              Section 16.   AGREEMENT OF RIGHTS HOLDERS.  Every holder of a 
Right, by accepting the same, consents and agrees with the Company and the 
Rights Agent and with every other holder of a Right that:

              (a)    prior to the Distribution Date, the Rights will be 
transferable only in connection with the transfer of shares of the Company's 
Common Stock;

              (b)    after the Distribution Date, the Rights Certificates are 
transferable only on the registry books of the Rights Agent if surrendered at 
the office of the Rights Agent designated for such purpose, duly endorsed or 
accompanied by a proper instrument of transfer;

              (c)    subject to Sections 6(a) and 7(f) hereof, the Company 
and the Rights Agent may deem and treat the person in whose name the Rights 
Certificate (or, prior to the Distribution Date, the associated Common Stock 
certificate) is registered as the absolute owner thereof and of the Rights 
evidenced thereby (notwithstanding any notations of ownership or writing on 
the Rights Certificates or the associated Common Stock certificate made by 
anyone other than the Company or the Rights Agent) for all purposes 
whatsoever, and neither the Company nor the Rights Agent shall be affected by 
any notice to the contrary; and

              (d)    notwithstanding anything in this Agreement to the 
contrary, neither the Company nor the Rights Agent shall have any liability 
to any holder of a Right or other Person as a result of its inability to 
perform any of its obligations under this Agreement by reason of any 
preliminary or permanent injunction or other order, decree or ruling issued 
by a court of competent jurisdiction or by a governmental, regulatory or 
administrative agency or commission, or any statute, rule, regulation or 
executive order promulgated or enacted by any governmental authority, 
prohibiting or otherwise restraining performance of such obligation; 
PROVIDED, HOWEVER, the Company must use its best efforts to have any such 
order, decree or ruling lifted or otherwise overturned as soon as possible.

              Section 17.   RIGHTS CERTIFICATE HOLDER NOT DEEMED A 
STOCKHOLDER. No holder, as such, of any Rights Certificate shall be entitled 
to vote, receive dividends or be deemed for any purpose the holder of the 
Units of Preferred Stock or any other securities of the Company which may at 
any time be issuable upon the exercise of the Rights represented thereby, nor 
shall anything contained herein or in any Rights Certificate be construed to 
confer upon the holder of any Rights Certificate, as such, any of the rights 
of a stockholder of the Company or any right to vote for the election of 
directors or upon any matter submitted to stockholders at any meeting 
thereof, or to give or withhold consent to any corporate action, or to 
receive notice of meetings or other actions affecting stockholders (except as 
provided in Section 25 hereof), or to receive 

                                      25.
<PAGE>

dividends or subscription rights, or otherwise, until the Right or Rights 
evidenced by such Rights Certificate shall have been exercised in accordance 
with the provisions hereof.

              Section 18.   CONCERNING THE RIGHTS AGENT.  The Company agrees 
to pay to the Rights Agent reasonable compensation for all services rendered 
by it hereunder and, from time to time, on demand of the Rights Agent, its 
reasonable expenses and counsel fees and other disbursements incurred in the 
administration and execution of this Agreement and the exercise and 
performance of its duties hereunder.  The Company also agrees to indemnify 
the Rights Agent for, and to hold it harmless against, any loss, liability, 
or expense, incurred without negligence or willful misconduct on the part of 
the Rights Agent, for any action taken, suffered or omitted by the Rights 
Agent in connection with the execution, acceptance and administration of this 
Agreement and the exercise and performance hereunder of its duties, including 
the costs and expenses of defending against and appealing any claim of 
liability.  Anything to the contrary notwithstanding, in no event shall the 
Rights Agent be liable for special, indirect, consequential or incidental 
loss or damage of any kind whatsoever (including but not limited to lost 
profits), even if the Rights Agent has been advised of the likelihood of such 
damages.  The indemnity provided herein shall survive the termination of this 
Agreement and the expiration of the Rights.  The costs and expenses incurred 
in enforcing this right of indemnification shall be paid by the Company.

              The Rights Agent may conclusively rely upon and shall be 
protected and shall incur no liability for, or in respect of any action 
taken, suffered or omitted by it in connection with, its administration of 
this Agreement and the exercise and performance of its duties hereunder in 
reliance upon any Rights Certificate or certificate for Units of Preferred 
Stock or shares of Common Stock or for other securities of the Company, 
instrument of assignment or transfer, power of attorney, endorsement, 
affidavit, letter, notice, direction, consent, certificate, statement, or 
other paper or document believed by it to be genuine and to be signed, 
executed and, where necessary, verified or acknowledged, by the proper person 
or persons, or otherwise upon the advice of counsel as set forth in Section 
20 hereof.

              Section 19.   MERGER OR CONSOLIDATION OR CHANGE OF NAME OF 
RIGHTS AGENT.

              (a)    Any corporation into which the Rights Agent or any 
successor Rights Agent may be merged or with which it may be consolidated, or 
any corporation resulting from any merger or consolidation to which the 
Rights Agent or any successor Rights Agent shall be a party, or any 
corporation succeeding to the stock transfer or corporate trust business of 
the Rights Agent or any successor Rights Agent, shall be the successor to the 
Rights Agent under this Agreement without the execution or filing of any 
paper or any further act on the part of any of the parties hereto, provided 
that such corporation would be eligible for appointment as a successor Rights 
Agent under the provisions of Section 21 hereof.  In case at the time such 
successor Rights Agent shall succeed to the agency created by this Agreement 
any of the Rights Certificates shall have been countersigned but not 
delivered, any such successor Rights Agent may adopt the countersignature of 
the predecessor Rights Agent and deliver such Rights Certificates so 
countersigned; and in case at that time any of the Rights Certificates shall 
not have been countersigned, any successor Rights Agent may countersign such 
Rights Certificates either in the name of the predecessor Rights Agent or in 
the name of the successor Rights Agent; 


                                      26.
<PAGE>

and in all such cases such Rights Certificates shall have the full force 
provided in the Rights Certificates and in this Agreement.

              (b)    In case at any time the name of the Rights Agent shall 
be changed and at such time any of the Rights Certificates shall have been 
countersigned but not delivered, the Rights Agent may adopt the 
countersignature under its prior name and deliver Rights Certificates so 
countersigned; and in case at that time any of the Rights Certificates shall 
not have been countersigned, the Rights Agent may countersign such Rights 
Certificates either in its prior name or in its changed name; and in all such 
cases such Rights Certificates shall have the full force provided in the 
Rights Certificates and in this Agreement.

              Section 20.   DUTIES OF RIGHTS AGENT.  The Rights Agent 
undertakes the duties and obligations imposed by this Agreement upon the 
following terms and conditions and no implied duties or obligations shall be 
read into this Agreement against the Rights Agent, by all of which the 
Company and the holders of Rights Certificates, by their acceptance thereof, 
shall be bound:

              (a)    Before the Rights Agent acts or refrains from acting, it 
may consult with legal counsel of its choice (who may be legal counsel for 
the Company), and the advice or opinion of such counsel shall be full and 
complete authorization and protection to the Rights Agent as to any action 
taken, suffered or omitted by it in good faith and in accordance with such 
advice or opinion.

              (b)    Whenever in the administration, exercise and performance 
of its duties under this Agreement the Rights Agent shall deem it necessary 
or desirable that any fact or matter be proved or established by the Company 
prior to taking, suffering or omitting any action hereunder, such fact or 
matter (unless other evidence in respect thereof be herein specifically 
prescribed) may be deemed to be conclusively proved and established by a 
certificate signed by any one of the Chairman of the Board, the Chief 
Executive Officer, the President, any Vice President, the Chief Financial 
Officer, or the Secretary or any Assistant Secretary of the Company and 
delivered to the Rights Agent; and such certificate shall be full 
authorization to the Rights Agent for any action taken or suffered in good 
faith by it under the provisions of this Agreement in reliance upon such 
certificate.

              (c)    The Rights Agent shall be liable hereunder to the 
Company and any other Person only for its own negligence, bad faith or 
willful misconduct.

              (d)    The Rights Agent shall not be liable for or by reason of 
any of the statements of fact or recitals contained in this Agreement or in 
the Rights Certificates (except its countersignature thereof) or be required 
to verify the same, but all such statements and recitals are and shall be 
deemed to have been made by the Company only.

              (e)    The Rights Agent shall not be under any liability or 
responsibility in respect of the legality, validity or enforceability of this 
Agreement or the execution and delivery hereof (except the due execution 
hereof by the Rights Agent) or in respect of the legality, validity or 
enforceability or the execution of any Rights Certificate (except its 
countersignature thereof and has actual knowledge of such change or 
adjustment); nor shall it be liable or 


                                      27.
<PAGE>

responsible for any breach by the Company of any covenant or condition 
contained in this Agreement or in any Rights Certificate; nor shall it be 
responsible for any change in the exercisability of the Rights (including the 
Rights becoming void pursuant to Section 11(a)(ii) hereof) or any adjustment 
in the terms of the Rights (including the manner, method or amount thereof) 
provided for in Section 3, 11, 13, 23 or 24, or the ascertaining of the 
existence of facts that would require any such change or adjustment (except 
with respect to the exercise of Rights evidenced by Rights Certificates after 
receipt of the certificate described in Section 12 hereof or has actual 
knowledge of such change or adjustment); nor shall it by any act hereunder be 
deemed to make any representation or warranty as to the authorization or 
reservation of any Units of Preferred Stock to be issued pursuant to this 
Agreement or any Rights Certificate or as to whether any Preferred Stock 
will, when issued, be validly authorized and issued, fully paid and 
nonassessable.

              (f)    The Company agrees that it will perform, execute, 
acknowledge and deliver or cause to be performed, executed, acknowledged and 
delivered all such further and other acts, instruments and assurances as may 
reasonably be required by the Rights Agent for the carrying out or performing 
by the Rights Agent of the provisions of this Agreement.

              (g)    The Rights Agent is hereby authorized and directed to 
accept instructions with respect to the administration, exercise and 
performance of its duties hereunder from any one of the Chairman of the 
Board, the Chief Executive Officer, the President, any Vice President, the 
Chief Financial Officer, the Secretary or any Assistant Secretary of the 
Company, and to apply to such officers for advice or instructions in 
connection with its duties, and it shall not be liable for any action taken 
or suffered by it in good faith in accordance with instructions of any such 
officer or for any delay in acting while waiting for those instructions.  Any 
application by the Rights Agent for written instructions from the Company 
may, at the option of the Rights Agent, set forth in writing any action 
proposed to be taken or omitted by the Rights Agent under this Rights 
Agreement and the date on and/or after which such action shall be taken or 
such omission shall be effective.  The Rights Agent shall not be liable for 
any action taken by, or omission of, the Rights Agent in accordance with a 
proposal included in any such application on or after the date specified in 
such application (which date shall not be less than five (5) Business Days 
after the date any officer of the Company actually received such application, 
unless any such officer shall have consented in writing to an earlier date) 
unless, prior to taking any such action (or the effective date in the case of 
an omission), the Rights Agent shall have received written instructions in 
response to such application specifying the action to be taken or omitted.

              (h)    The Rights Agent and any stockholder, director, officer 
or employee of the Rights Agent may buy, sell or deal in any of the Rights or 
other securities of the Company or become pecuniarily interested in any 
transaction in which the Company may be interested, or contract with or lend 
money to the Company or otherwise act as fully and freely as though it were 
not Rights Agent under this Agreement.  Nothing herein shall preclude the 
Rights Agent from acting in any other capacity for the Company or for any 
other legal entity.

              (i)    The Rights Agent may execute and exercise any of the 
rights or powers hereby vested in it or perform any duty hereunder either 
itself or by or through its attorneys or agents, and the Rights Agent shall 
not be answerable or accountable for any act, default, neglect or misconduct 
of any such attorneys or agents or for any loss to the Company resulting from 
any 


                                      28.
<PAGE>

such act, default, neglect or misconduct, provided reasonable care was 
exercised in the selection and continued employment thereof.

              (j)    No provision of this Agreement shall require the Rights 
Agent to expend or risk its own funds or otherwise incur any financial 
liability in the performance of any of its duties hereunder or in the 
exercise of its rights if the Rights Agent in good faith believes that 
repayment of such funds or adequate indemnification against such risk or 
liability is not reasonably assured to it.

              (k)    If, with respect to any Rights Certificate surrendered 
to the Rights Agent for exercise, transfer, split up, combination or 
exchange, the certification on the form of assignment or form of election to 
purchase, as the case may be, that the Rights evidenced by the Rights 
Certificate are not owned by an Acquiring Person, or an Affiliate or 
Associate thereof, has either not been completed or in any manner indicates 
any other response thereto, the Rights Agent shall not take any further 
action with respect to such requested exercise, transfer, split up, 
combination or exchange, without first consulting with the Company.

              Section 21.   CHANGE OF RIGHTS AGENT.  The Rights Agent or any 
successor Rights Agent may resign and be discharged from its duties under 
this Agreement upon thirty (30) days' notice in writing mailed to the Company 
and to each transfer agent of the Common Stock or Preferred Stock (as to 
which the Rights Agent has received prior written notice) by registered or 
certified mail, and the Company shall mail notice thereof to the holders of 
the Rights Certificates by first-class mail.  The Company may remove the 
Rights Agent or any successor Rights Agent upon thirty (30) days' notice in 
writing, mailed to the Rights Agent or successor Rights Agent, as the case 
may be, and to each transfer agent of the Common Stock or Preferred Stock (as 
to which the Rights Agent has received prior written notice) by registered or 
certified mail, and to the holders of the Rights Certificates by first-class 
mail.  If the Rights Agent shall resign or be removed or shall otherwise 
become incapable of acting, the Company shall appoint a successor to the 
Rights Agent.  If the Company shall fail to make such appointment within a 
period of thirty (30) days after giving notice of such removal or after it 
has been notified in writing of such resignation or incapacity by the 
resigning or incapacitated Rights Agent or by the holder of a Rights 
Certificate (who shall, with such notice, submit such holder's Rights 
Certificate for inspection by the Company), then the registered holder of any 
Rights Certificate may apply to any court of competent jurisdiction for the 
appointment of a new Rights Agent.  Any successor Rights Agent, whether 
appointed by the Company or by such a court, shall be either (A) a 
corporation organized and doing business under the laws of the United States 
or of any state of the United States, in good standing, authorized under such 
laws to exercise corporate trust or stock transfer powers, and subject to 
supervision or examination by federal or state authority and which has at the 
time of its appointment as Rights Agent a combined capital and surplus of at 
least $50 million or (B) an affiliate of such a corporation.  After 
appointment, the successor Rights Agent shall be vested with the same powers, 
rights, duties and responsibilities as if it had been originally named as 
Rights Agent without further act or deed; but the predecessor Rights Agent 
shall deliver and transfer to the successor Rights Agent any property at the 
time held by it hereunder, and execute and deliver any further assurance, 
conveyance, act or deed necessary for the purpose.  Not later than the 
effective date of any such appointment the Company shall file notice thereof 
in writing with the predecessor Rights Agent and each transfer agent of the 
Common Stock or Preferred Stock, and mail a notice thereof in writing to the 


                                      29.
<PAGE>

registered holders of the Rights Certificates. Failure to give any notice 
provided for in this Section 21, however, or any defect therein, shall not 
affect the legality or validity of the resignation or removal of the Rights 
Agent or the appointment of the successor Rights Agent, as the case may be.

              Section 22.   ISSUANCE OF NEW RIGHTS CERTIFICATES. 
Notwithstanding any of the provisions of this Agreement or of the Rights to 
the contrary, the Company may, at its option, issue new Rights Certificates 
evidencing Rights in such form as may be approved by its Board of Directors 
to reflect any adjustment or change in the Purchase Price and the number or 
kind or class of shares or other securities or property purchasable under the 
Rights Certificates made in accordance with the provisions of this Agreement. 
In addition, in connection with the issuance or sale of shares of Common 
Stock following the Distribution Date and prior to the redemption or 
expiration of the Rights, the Company (a) shall, with respect to shares of 
Common Stock so issued or sold pursuant to the exercise of stock options or 
under any employee benefit plan or arrangement or upon the exercise, 
conversion or exchange of securities of the Company currently outstanding or 
issued at any time in the future by the Company, and (b) may, in any other 
case, if deemed necessary or appropriate by the Board of Directors of the 
Company issue Rights Certificates representing the appropriate number of 
Rights in connection with such issuance or sale; PROVIDED, HOWEVER, that (i) 
no such Rights Certificate shall be issued and this sentence shall be null 
and void AB INITIO if, and to the extent that, such issuance or this sentence 
would create a significant risk of or result in material adverse tax 
consequences to the Company or the Person to whom such Rights Certificate 
would be issued or would create a significant risk of or result in such 
options' or employee plans' or arrangements' failing to qualify for otherwise 
available special tax treatment and (ii) no such Rights Certificate shall be 
issued if, and to the extent that, appropriate adjustment shall otherwise 
have been made in lieu of the issuance thereof.  Any rights Certificate 
issued pursuant to this Section 22 shall have impressed on, printed on, 
written on or otherwise affixed to and shall be subject to the legend set 
forth in Section 3(c) hereof.

              Section 23.   REDEMPTION AND TERMINATION.

              (a)    The Company may, at its option, upon approval by a 
majority of the Directors, at any time prior to the earlier of (i) the Shares 
Acquisition Date, or (ii) the Final Expiration Date redeem all but not less 
than all the then outstanding Rights at a redemption price of $0.001 per 
Right, appropriately adjusted to reflect any stock split, stock dividend or 
similar transaction occurring after the date hereof (such redemption price 
being hereinafter referred to as the "Redemption Price"), and the Company 
may, at its option, pay the Redemption Price either in cash, shares of Common 
Stock (based on the current per share market price thereof (as determined 
pursuant to Section 11(d) hereof) at the time of redemption), or any other 
form of consideration deemed appropriate by the Board of Directors.  The 
redemption of the Rights by the Board of Directors may be made effective at 
such time on such basis and with such conditions as a majority of the 
Directors in their sole discretion may establish.

              (b)    Immediately upon the action of a majority of the 
Directors of the Company ordering the redemption of the Rights pursuant to 
paragraph (a) of this Section 23, and without any further action and without 
any notice, the right to exercise the Rights will terminate and the only 
right thereafter of the holders of Rights shall be to receive the Redemption 
Price.  


                                      30.
<PAGE>

The Company shall promptly give public notice of any such redemption; 
PROVIDED, HOWEVER, that the failure to give, or any defect in, any such 
notice shall not affect the validity of such redemption.  Within 10 days 
after such action of a majority of the Directors ordering the redemption of 
the Rights, the Company shall give notice of such redemption to the Rights 
Agent and shall mail a notice of redemption to all the holders of the then 
outstanding Rights at their last addresses as they appear upon the registry 
books of the Rights Agent or, prior to the Distribution Date, on the registry 
books of the transfer agent for the Common Stock.  Any notice which is mailed 
in the manner herein provided shall be deemed given, whether or not the 
holder receives the notice.  Each such notice of redemption will state the 
method by which the payment of the Redemption Price will be made. Neither the 
Company nor any of its Affiliates or Associates may redeem, acquire or 
purchase for value any Rights at any time in any manner other than that 
specifically set forth in this Section 23 or in Section 24 hereof, and other 
than in connection with the purchase of shares of Common Stock prior to the 
Distribution Date.

              (c)    Notwithstanding anything contained in this Agreement to 
the contrary, the Rights shall not be exercisable pursuant to Section 7(a) at 
any time when the Rights are redeemable hereunder.

              Section 24.   EXCHANGE.

              (a)    The Company, at its option, upon approval by a majority 
of the Directors, at any time after any Person becomes an Acquiring Person, 
may exchange all or part of the then outstanding and exercisable Rights 
(which shall not include Rights that have become void pursuant to the 
provisions of Section 7(e) hereof) for Units of Preferred Stock at an 
exchange ratio equal to, subject to adjustment to reflect stock splits, stock 
dividends and similar transactions occurring after the date hereof, that 
number obtained by dividing the Purchase Price by the then current per share 
market price per Unit of Preferred Stock on the earlier of (i) the date on 
which any Person becomes an Acquiring Person and (ii) the date on which a 
tender or exchange offer by any Person (other than the Company, any 
Subsidiary of the Company, any employee benefit plan maintained by the 
Company or any of its Subsidiaries or any trustee or fiduciary with respect 
to such plan acting in such capacity) is first published or sent or given 
within the meaning of Rule 14d-4(a) of the Exchange Act Regulations or any 
successor rule, if upon consummation thereof such Person would be the 
Beneficial Owner of 15% or more of the shares of Common Stock then 
outstanding (such exchange ratio being hereinafter referred to as the 
"Section 24(a) Exchange Ratio"). Notwithstanding the foregoing, the Company 
may not effect such exchange at any time after any Person (other than the 
Company, any Subsidiary of the Company, any employee benefit plan maintained 
by the Company or any of its Subsidiaries, or any trustee or fiduciary with 
respect to such plan acting in such capacity), together with all Affiliates 
and Associates of such Person, becomes the Beneficial Owner of 50% or more of 
the shares of Common Stock then outstanding.

              (b)    Immediately upon the action of the Board of Directors of 
the Company ordering the exchange of any Rights pursuant to subsection (a) of 
this Section 24 and without any further action and without any notice, the 
right to exercise such Rights shall terminate and the only right thereafter 
of a holder of such Rights shall be to receive that number of Units of 
Preferred Stock equal to the number of such Rights held by such holder 
multiplied by the 


                                      31.
<PAGE>

Section 24(a) Exchange Ratio.  The Company shall promptly give public notice 
of any such exchange; PROVIDED, HOWEVER, that the failure to give, or any 
defect in, such notice shall not affect the validity of such exchange.  The 
Company promptly shall mail a notice of any such exchange to all of the 
holders of such Rights at their last addresses as they appear upon the 
registry books of the Rights Agent.  Any notice which is mailed in the manner 
herein provided shall be deemed given, whether or not the holder receives the 
notice.  Each such notice of exchange will state the method by which the 
exchange of Units of Preferred Stock for Rights will be effected and, in the 
event of any partial exchange, the number of Rights which will be exchanged.  
Any partial exchange shall be effected PRO RATA based on the number of Rights 
(other than Rights which have become void pursuant to the provisions of 
Section 7(e) hereof) held by each holder of Rights.

              (c)    In the event that the number of shares of Preferred 
Stock which are authorized by the Company's Certificate of Incorporation but 
not outstanding or reserved for issuance for purposes other than upon 
exercise of the Rights are not sufficient to permit any exchange of Rights as 
contemplated in accordance with this Section 24, the Company shall take all 
such action as may be necessary to authorize additional shares of Preferred 
Stock for issuance upon exchange of the Rights or make adequate provision to 
substitute (1) cash, (2) Company Common Stock or other equity securities of 
the Company, (3) debt securities of the Company, (4) other assets, or (5) any 
combination of the foregoing, having an aggregate value equal to the 
Adjustment Spread, where such aggregate value has been determined by a 
majority of the Directors.  To the extent that the Company determines that 
some action need be taken pursuant to subsection (a) of this Section 24, the 
Board of Directors may temporarily suspend the exercisability of the Rights 
for a period of up to sixty (60) days following the date on which the event 
described in Section 24(a) shall have occurred, in order to seek any 
authorization of additional shares of Preferred Stock and/or to decide the 
appropriate form of distribution to be made pursuant to the above provision 
and to determine the value thereof.  In the event of any such suspension, the 
Company shall issue a public announcement stating that the exercisability of 
the Rights has been temporarily suspended.

              (d)    The Company shall not be required to issue fractions 
smaller than or to distribute certificates which evidence fractions smaller 
than one one-thousandth of a share of Preferred Stock.  In lieu thereof, the 
Company shall pay to the registered holders of the Rights Certificates with 
regard to which such fractional Units would otherwise be issuable an amount 
in cash equal to the same fraction of the current market value (as determined 
pursuant to Section 11(d)(i) hereof) of one Unit of Preferred Stock.

              Section 25.   NOTICE OF CERTAIN EVENTS.

              (a)    In case the Company shall propose (i) to pay any 
dividend payable in stock of any class to the holders of its Preferred Stock 
or to make any other distribution to the holders of its Preferred Stock 
(other than a regular quarterly cash dividend), (ii) to offer to the holders 
of its Preferred Stock rights or warrants to subscribe for or to purchase any 
additional Units of Preferred Stock or shares of stock of any class or any 
other securities, rights or options, (iii) to effect any reclassification of 
its Preferred Stock (other than a reclassification involving only the 
subdivision of outstanding Preferred Stock), (iv) to effect any consolidation 
or merger 


                                      32.
<PAGE>

into or with any other Person (other than a Subsidiary of the Company in a 
transaction which complies with Section 11(o)), or to effect any sale or 
other transfer (or to permit one or more of its Subsidiaries to effect any 
sale or other transfer), in one or more transactions, of 50% or more of the 
assets or earning power of the Company and its Subsidiaries (taken as a 
whole) to, any other Person, (v) to effect the liquidation, dissolution or 
winding up of the Company, or (vi) to declare or pay any dividend on the 
Common Stock payable in shares of Common Stock or to effect a subdivision, 
combination or consolidation of the shares of Common Stock (by 
reclassification or otherwise than by payment of dividends in shares of 
Common Stock), then, in each such case, the Company shall give to each holder 
of a Rights Certificate, in accordance with Section 26 hereof, a notice of 
such proposed action, which shall specify the record date for the purposes of 
such stock dividend, or distribution of rights or warrants, or the date on 
which such reclassification, consolidation, merger, sale, transfer, 
liquidation, dissolution, or winding up is to take place and the date of 
participation therein by the holders of the shares of Common Stock and/or 
shares of Preferred Stock, if any such date is to be fixed, and such notice 
shall be so given in the case of any action covered by clause (i) or (ii) 
above at least ten (10) days prior to the record date for determining holders 
of the shares of Preferred Stock for purposes of such action, and in the case 
of any such other action, at least ten (10) days prior to the date of the 
taking of such proposed action or the date of participation therein by the 
holders of the shares of Common Stock and/or shares of Preferred Stock, 
whichever shall be the earlier.

              (b)    In case any of the events set forth in Section 11(a)(ii) 
hereof shall occur, then the Company shall as soon as practicable thereafter 
give to each holder of a Rights Certificate, in accordance with Section 26 
hereof, a notice of the occurrence of such event, which notice shall describe 
such event and the consequences of such event to holders of Rights under 
Section 11(a)(ii) hereof.  In the event any Person becomes an Acquiring 
Person, the Company will promptly notify the Rights Agent thereof.

              Section 26.   NOTICES.  Notices or demands authorized by this 
Agreement to be given or made by the Rights Agent or by the holder of any 
Rights Certificate to or on the Company shall be sufficiently given or made 
if sent by first-class mail, postage prepaid, addressed (until another 
address is filed in writing with the Rights Agent) as follows:

       Triangle Pharmaceuticals, Inc.
       4 University Place
       4611 University Drive
       Durham, North Carolina 27707
       Attention:  General Counsel

Subject to the provisions of Section 21 hereof, any notice or demand 
authorized by this Agreement to be given or made by the Company or by the 
holder of any Rights Certificate to or on the Rights Agent shall be sent by 
registered or certified mail and shall be deemed given upon receipt and 
addressed (until another address is filed in writing with the Company) as 
follows:

       American Stock Transfer & Trust Company
       6201 Fifteenth Avenue
       Brooklyn, New York 11219
       Attention:  Herb Lemmer


                                      33.
<PAGE>

Notices or demands authorized by this Agreement to be given or made by the 
Company or the Rights Agent to the holder of any Rights Certificate shall be 
sufficiently given or made if sent by first-class mail, postage prepaid, 
addressed to such holder at the address of such holder as shown on the 
registry books of the Company.

              Section 27.   SUPPLEMENTS AND AMENDMENTS.  Prior to the 
Distribution Date, the Company may supplement or amend this Agreement in any 
respect, without the approval of any holders of Rights, by action of its 
Board of Directors and the Rights Agent shall, if the Company so directs, 
execute such supplement or amendment. From and after the Distribution Date, 
the Company may from time to time supplement or amend this Agreement without 
the approval of any holders of Rights, by action of its Board of Directors in 
order (i) to cure any ambiguity, (ii) to correct or supplement any provision 
contained herein which may be defective or inconsistent with any other 
provisions herein, (iii) to shorten or lengthen any time period hereunder or 
(iv) to change or supplement the provisions hereunder in any manner which the 
Company may deem necessary or desirable and which shall not adversely affect 
the interests of the holders of Rights Certificates (other than an Acquiring 
Person or an Affiliate or Associate of an Acquiring Person), including, 
without limitation, to change the Purchase Price, the Redemption Price, any 
time periods herein specified, and any other term hereof, any such supplement 
or amendment to be evidenced by a writing signed by the Company and the 
Rights Agent; PROVIDED, HOWEVER, that from and after such time as any Person 
becomes an Acquiring Person, this Agreement shall not be amended in any 
manner which would adversely affect the interests of the holders of Rights.  
Upon receipt of a certificate from an appropriate officer of the Company that 
the proposed supplement or amendment is consistent with this Section 27 and, 
after such time as any Person has become an Acquiring Person, that the 
proposed supplement or amendment does not adversely affect the interests of 
the holders of Rights, the Rights Agent shall execute such supplement or 
amendment.

              Section 28.   SUCCESSORS.  All the covenants and provisions of 
this Agreement by or for the benefit of the Company or the Rights Agent shall 
bind and inure to the benefit of their respective successors and assigns 
hereunder.

              Section 29.   DETERMINATIONS AND ACTIONS BY THE BOARD OF 
DIRECTORS.  For all purposes of this Agreement, any calculation of the number 
of shares of Common Stock outstanding at any particular time, including for 
purposes of determining the particular percentage of such outstanding shares 
of Common Stock of which any Person is the Beneficial Owner, shall be made in 
accordance with the last sentence of Rule 13d-3(d)(1)(i) of the Exchange Act. 
The Board of Directors of the Company shall have the exclusive power and 
authority to administer this Agreement and to exercise all rights and powers 
specifically granted to the Board of Directors, or the Company, or as may be 
necessary or advisable in the administration of this Agreement, including, 
without limitation, the right and power to (i) interpret the provisions of 
this Agreement and (ii) make all determinations deemed necessary or advisable 
for the administration of this Agreement (including a determination to redeem 
or not redeem the Rights or to amend the Agreement).  All such actions, 
calculations, interpretations and determinations (including, for purposes of 
clause (y) below, all omissions with respect to the foregoing), which are 
done or made by the Board of Directors in good faith, shall (x) be final, 
conclusive and binding on the Company, the Rights Agent, the holders of the 
Rights Certificates 


                                      34.
<PAGE>

and all other parties and (y) not subject the Board of Directors to any 
liability to the holders of the Rights.

              Section 30.   BENEFITS OF THIS AGREEMENT.  Nothing in this 
Agreement shall be construed to give to any person or corporation other than 
the Company, the Rights Agent and the registered holders of the Rights 
Certificates (and, prior to the Distribution Date, shares of Common Stock) 
any legal or equitable right, remedy or claim under this Agreement; but this 
Agreement shall be for the sole and exclusive benefit of the Company, the 
Rights Agent and the registered holders of the Rights Certificates (and, 
prior to the Distribution Date, shares of Common Stock).

              Section 31.   SEVERABILITY.  If any term, provision, covenant 
or restriction of this Agreement is held by a court of competent jurisdiction 
or other authority to be invalid, void or unenforceable, the remainder of the 
terms, provisions, covenants and restrictions of this Agreement shall remain 
in full force and effect and shall in no way be affected, impaired or 
invalidated; PROVIDED, HOWEVER, that notwithstanding anything in this 
Agreement to the contrary, if any such term, provision, covenant or 
restriction is held by such court or authority to be invalid, void or 
unenforceable and the Board of Directors of the Company determines in its 
good faith judgment that severing the invalid language from this Agreement 
would adversely affect the purpose or effect of this Agreement, the right of 
redemption set forth in Section 23 hereof shall be reinstated and shall not 
expire until the tenth Business Day following the date of such determination 
by the Board of Directors of the Company.

              Section 32.   GOVERNING LAW.  This Agreement and each Rights 
Certificate issued hereunder shall be deemed to be a contract made under the 
laws of the State of Delaware and for all purposes shall be governed by and 
construed in accordance with the laws of such State applicable to contracts 
to be made and performed entirely within such State.

              Section 33.   COUNTERPARTS.  This Agreement may be executed in 
any number of counterparts and each of such counterparts shall for all 
purposes be deemed to be an original, and all such counterparts shall 
together constitute but one and the same instrument.

              Section 34.   DESCRIPTIVE HEADINGS.  Descriptive headings of 
the several sections of this Agreement are inserted or convenience only and 
shall not control or affect the meaning or construction of any of the 
provisions hereof.
                                          
                 [REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]



                                      35.
<PAGE>

              IN WITNESS WHEREOF, the parties hereto have caused this 
Agreement to be duly executed and attested, all as of the day and year first 
above written.

 ATTEST:                                   TRIANGLE PHARMACEUTICALS, INC

 By:                                       By:    
    ----------------------------------        ----------------------------------
    Name:  John A. Denniston                  Name: David W. Barry
    Title:  Counsel for Triangle              Title: Chairman and Chief
            Pharmaceuticals, Inc.             Executive Officer


 ATTEST:                                   AMERICAN STOCK TRANSFER & TRUST
                                           COMPANY
                                           as Rights Agent



 By:                                       By:
    ----------------------------------        ----------------------------------
    Name:                                     Name:
                                                   -----------------------------
    Title:                                    Title:
                                                    ----------------------------


                                      
<PAGE>

                                                                       EXHIBIT A
                                          
                                        FORM
                                          
                                         of
                                          
                             CERTIFICATE OF DESIGNATION
                                          
                                         of
                                          
                   SERIES B JUNIOR PARTICIPATING PREFERRED STOCK
                                          
                                         of
                                          
                           TRIANGLE PHARMACEUTICALS, INC.
                                          
                          (Pursuant to Section 151 of the
                                          
                         Delaware General Corporation Law)
                                          
                         _________________________________
                                          
              TRIANGLE PHARMACEUTICALS, Inc., a corporation organized and 
existing under the General Corporation Law of the State of Delaware 
(hereinafter called the "Corporation"), hereby certifies that the following 
resolution was adopted by the Board of Directors of the Corporation as 
required by Section 151 of the General Corporation Law at a meeting duly 
called and held on January 29, 1999;

              RESOLVED, that pursuant to the authority granted to and vested 
in the Board of Directors of the Corporation (hereinafter called the "Board 
of Directors" or the "Board") in accordance with the provisions of the 
Certificate of Incorporation, the Board of Directors hereby creates a series 
of Preferred Stock, par value $.001 per share (the "Preferred Stock"), of the 
Corporation and hereby states the designation and number of shares, and fixes 
the relative rights, preferences, and limitations thereof as follows:

              Series B Junior Participating Preferred Stock:

              Section 1.    DESIGNATION AND AMOUNT.  The shares of such 
series shall be designated as "Series B Junior Participating Preferred Stock" 
(the "Series B Preferred Stock") and the number of shares constituting the 
Series B Preferred Stock shall be One Million Two Hundred Thousand 
($1,200,000).  Such number of shares may be increased or decreased by 
resolution of the Board of Directors; PROVIDED, that no decrease shall reduce 
the number of shares of Series B 

                                      A-1
<PAGE>

Preferred Stock to a number less than the number of shares then outstanding 
plus the number of shares reserved for issuance upon the exercise of 
outstanding options, rights or warrants or upon the conversion of any 
outstanding securities issued by the Corporation convertible into Series B 
Preferred Stock.

              Section 2.    DIVIDENDS AND DISTRIBUTIONS.

              (A)    Subject to the rights of the holders of any shares of any
       series of Preferred Stock (or any similar stock) ranking prior and
       superior to the Series B Preferred Stock with respect to dividends, each
       holder of a share of Series B Preferred Stock, in preference to the
       holders of shares of Common Stock, par value $.001 per share (the "Common
       Stock"), of the Corporation, and of any other junior stock, shall be
       entitled to receive, when, as and if declared by the Board of Directors
       out of funds legally available for the purpose, quarterly dividends
       payable in cash on the last day of March, June, September and December in
       each year (each such date being referred to herein as a "Quarterly
       Dividend Payment Date"), commencing on the first Quarterly Dividend
       Payment Date after the first issuance of a share or fraction of a share
       Series B Preferred Stock, in an amount per share (rounded to the nearest
       cent) equal to, subject to the provision for adjustment hereinafter set
       forth, One Thousand (1,000) times the aggregate per share amount of all
       cash dividends, and One Thousand (1,000) times the aggregate per share
       amount (payable in kind) of all non-cash dividends or other
       distributions, other than a dividend payable in shares of Common Stock or
       a subdivision of the outstanding shares of Common Stock (by
       reclassification or otherwise), declared on the Common Stock since the
       immediately preceding Quarterly Dividend Payment Date or, with respect to
       the first Quarterly Dividend Payment Date, since the first issuance of a
       share or fraction of Series B Preferred Stock.  In the event the
       Corporation shall at any time declare or pay any dividend on the Common
       Stock payable in shares of Common Stock, or effect a subdivision or
       combination or consolidation of the outstanding shares of Common Stock
       (by reclassification or otherwise than by payment of a dividend in shares
       of Common Stock) into a greater or lesser number of shares of Common
       Stock, then in each such case the amount to which holders of shares of
       Series B Preferred Stock were entitled immediately prior to such event
       under clause (b) of the preceding sentence shall be adjusted by
       multiplying such amount by a fraction, the numerator of which is the
       number of shares of Common Stock outstanding immediately after such event
       and the denominator of which is the number of shares of Common Stock that
       were outstanding immediately prior to such event.

              (B)    The Corporation shall declare a dividend or distribution on
       the shares of Series B Preferred Stock as provided in paragraph (A) of
       this Section immediately after it declares a dividend or distribution on
       the Common Stock (other than a dividend payable in shares of Common
       Stock); provided, however, that, in the event no dividend or distribution
       shall have been declared on the Common Stock during the period between
       any Quarterly Dividend Payment Date and the next subsequent Quarterly
       Dividend Payment Date, a dividend of $1.00 per share of Series B
       Preferred Stock shall nevertheless be payable on such subsequent
       Quarterly Dividend Payment Date.


                                      A-2
<PAGE>

              (C)    Dividends shall begin to accrue and be cumulative on each
       outstanding share of Series B Participating Preferred Stock from the
       Quarterly Dividend Payment Date next preceding the date of issue of such
       share of Series B Participating Preferred Stock, unless the date of issue
       of such share is prior to the record date for the first Quarterly
       Dividend Payment Date, in which case dividends on such share shall begin
       to accrue from the date of issue of such share, or unless the date of
       issue is a Quarterly Dividend Payment Date or is a date after the record
       date for the determination of holders of shares of Series B Preferred
       Stock entitled to receive a quarterly dividend and before such Quarterly
       Dividend Payment Date, in either of which events such dividends shall
       begin to accrue and be cumulative from such Quarterly Dividend Payment
       Date.  Accrued but unpaid dividends shall not bear interest.  Dividends
       paid on the shares of Series B Preferred Stock in an amount less than the
       total amount of such dividends at the time accrued and payable on such
       shares shall be allocated pro rata on a share-by-share basis among all
       such shares at the time outstanding.  The Board of Directors may fix a
       record date for the determination of holders of shares of Series B
       Preferred Stock entitled to receive payment of a dividend or distribution
       declared thereon, which record date shall be not more than 60 days prior
       to the date fixed for the payment thereof.

              Section 3.    VOTING RIGHTS.  The holders of shares of Series B 
Preferred Stock shall have the following voting rights:

              (A)    Subject to the provision for adjustment hereinafter set
       forth, each share of Series B Preferred Stock shall entitle the holder
       thereof to One Thousand (1,000) votes on all matters submitted to a vote
       of the stockholders of the Corporation.  In the event the Corporation
       shall at any time declare or pay any dividend on the Common Stock payable
       in shares of Common Stock, or effect a subdivision or combination or
       consolidation of the outstanding shares of Common Stock (by
       reclassification or otherwise than by payment of a dividend in shares of
       Common Stock) into a greater or lesser number of shares of Common Stock,
       then in each such case the number of votes per share to which holders of
       shares of Series B Preferred Stock were entitled immediately prior to
       such event shall be adjusted by multiplying such number by a fraction,
       the numerator of which is the number of shares of Common Stock
       outstanding immediately after such event and the denominator of which is
       the number of shares of Common Stock that were outstanding immediately
       prior to such event.

              (B)    Except as otherwise provided herein, in any other
       Certificate of Designation creating a series of Preferred Stock or any
       similar stock, or by law, the holders of shares of Series B Preferred
       Stock and the holders of shares of Common Stock and any other capital
       stock of the Corporation having general voting rights shall vote together
       as one class on all matters submitted to a vote of stockholders of the
       Corporation.

              (C)    Except as set forth herein, or as otherwise provided by
       law, holders of Series B Preferred Stock shall have no special voting
       rights and their consent shall not be required (except to the extent they
       are entitled to vote with holders of Common Stock as set forth herein)
       for taking any corporate action.


                                      A-3
<PAGE>

              Section 4.    CERTAIN RESTRICTIONS.

              (A)    Whenever quarterly dividends or other dividends or
       distributions payable on the Series B Preferred Stock as provided in
       Section 2 are in arrears, thereafter and until all accrued and unpaid
       dividends and distributions, whether or not declared, on shares of Series
       B Preferred Stock outstanding shall have been paid in full, the
       Corporation shall not:

              (i)    declare or pay dividends, or make any other 
          distributions, on any shares of stock ranking junior (either as to 
          dividends or upon liquidation, dissolution or winding up) to the 
          Series B Preferred Stock;
       
              (ii)   declare or pay dividends, or make any other 
          distributions, on any shares of stock ranking on a parity (either as 
          to dividends or upon liquidation, dissolution or winding up) with the 
          Series B Preferred Stock, except dividends paid ratably on the shares 
          of Series B Preferred Stock and all such parity stock on which 
          dividends are payable or in arrears in proportion to the total 
          amounts to which the holders of all such shares are then entitled;
       
              (iii)  redeem or purchase or otherwise acquire for 
          consideration shares of any stock ranking junior (either as to 
          dividends or upon liquidation, dissolution or winding up) to the 
          Series B Preferred Stock, provided that the Corporation may at any 
          time redeem, purchase or otherwise acquire shares of any such junior 
          stock in exchange for shares of any stock of the Corporation ranking 
          junior (either as to dividends or upon dissolution, liquidation or 
          winding up) to the Series B Preferred Stock; or
       
              (iv)   redeem or purchase or otherwise acquire for 
          consideration any shares of Series B Preferred Stock, or any shares 
          of stock ranking on a parity with the Series B Preferred Stock, 
          except in accordance with a purchase offer made in writing or by 
          publication (as determined by the Board of Directors) to all holders 
          of such shares upon such terms as the Board of Directors, after 
          consideration of the respective annual dividend rates and other 
          relative rights and preferences of the respective series Bnd classes, 
          shall determine in good faith will result in fair and equitable 
          treatment among the respective series or classes.

              (B)    The Corporation shall not permit any subsidiary of the
       Corporation to purchase or otherwise acquire for consideration any shares
       of stock of the Corporation unless the Corporation could, under paragraph
       (A) of this Section 4, purchase or otherwise acquire such shares at such
       time and in such manner.

              Section 5.    REACQUIRED SHARES.  Any shares of Series B 
Preferred Stock purchased or otherwise acquired by the Corporation in any 
manner whatsoever shall be retired and cancelled promptly after the 
acquisition thereof.  All such shares shall upon their cancellation become 
authorized but unissued shares of Preferred Stock and may be reissued as part 
of a new series of Preferred Stock subject to the conditions and restrictions 
on issuance set 


                                      A-4
<PAGE>

forth herein, in the Certificate of Incorporation, or in any other 
Certificate of Designation creating a series of Preferred Stock or any 
similar stock or as otherwise required by law.

              Section 6.    LIQUIDATION, DISSOLUTION OR WINDING UP.

              (A)    Upon any liquidation, dissolution or winding up of the
       Corporation, no distribution shall be made (1) to the holders of shares
       of stock ranking junior (either as to dividends or upon liquidation,
       dissolution or winding up) to the Series B Preferred Stock unless, prior
       thereto, the holders of shares of Series B Preferred Stock shall have
       received One Thousand Dollars ($1,000) per share, plus an amount equal to
       accrued and unpaid dividends and distributions thereon, whether or not
       declared, to the date of such payment, provided that the holders of
       shares of Series B Preferred Stock shall be entitled to receive an
       aggregate amount per share, subject to the provision for adjustment
       hereinafter set forth, equal to 1,000 times the aggregate amount to be
       distributed per share to holders of shares of Common Stock (the "Common
       Adjustment"), or (2) to the holders of shares of stock ranking on a
       parity (either as to dividends or upon liquidation, dissolution or
       winding up) with the Series B Preferred Stock, except distributions made
       ratably on the Series B Preferred Stock and all such parity stock in
       proportion to the total amounts to which the holders of all such shares
       are entitled upon such liquidation, dissolution or winding up.  In the
       event the Corporation shall at any time declare or pay any dividend on
       the Common Stock payable in shares of Common Stock, or effect a
       subdivision or combination or consolidation of the outstanding shares of
       Common Stock (by reclassification or otherwise than by payment of a
       dividend in shares of Common Stock) into a greater or lesser number of
       shares of Common Stock, then in each such case the aggregate amount to
       which holders of shares of Series B Preferred Stock were entitled
       immediately prior to such event under the proviso in clause (1) of the
       preceding sentence shall be adjusted by multiplying such amount by a
       fraction the numerator of which is the number of shares of Common Stock
       outstanding immediately after such event and the denominator of which is
       the number of shares of Common Stock that were outstanding immediately
       prior to such event (the "Adjustment Number").

              (B)    In the event, however, that there are not sufficient assets
       available to permit payment in full to the Series B Liquidation
       Preference and the liquidation preferences of all other series of
       Preferred Stock, if any, which rank on a parity with the Series B
       Participating Preferred Stock, then such remaining assets shall be
       distributed ratably to the holders of such parity shares in proportion to
       their respective liquidation preferences.  In the event, however, that
       there are not sufficient assets available to permit payment in full of
       the Common Adjustment, then such remaining assets shall be distributed
       ratably to the holders of Common Stock.

              (C)    In the event the Corporation shall at any time after
       January 29, 1999 (i) declare any dividend on Common Stock payable in
       shares of Common Stock, (ii) subdivide the outstanding Common Stock, or
       (iii) combine the outstanding Common Stock into a smaller number of
       shares, then in each such case the Adjustment Number in effect
       immediately prior to such event shall be adjusted by multiplying such
       Adjustment Number by a fraction the numerator of which is the number of
       shares of Common Stock 


                                      A-5
<PAGE>

       outstanding immediately after such event and the denominator of which is
       the number of shares of Common Stock that were outstanding immediately
       prior to such event.

              Section 7.    CONSOLIDATION, MERGER, ETC.  In case the 
Corporation shall enter into any consolidation, merger, combination or other 
transaction in which the shares of Common Stock are exchanged for or changed 
into other stock or securities, cash and/or any other property, then in any 
such case each share of Series B Preferred Stock shall at the same time be 
similarly exchanged or changed into an amount per share, subject to the 
provision for adjustment hereinafter set forth, equal to One Thousand (1,000) 
times the aggregate amount of stock, securities, cash and/or any other 
property (payable in kind), as the case may be, into which or for which each 
share of Common Stock is changed or exchanged.  In the event the Corporation 
shall at any time declare or pay any dividend on the Common Stock payable in 
shares of Common Stock, or effect a subdivision or combination or 
consolidation of the outstanding shares of Common Stock (by reclassification 
or otherwise than by payment of a dividend in shares of Common Stock) into a 
greater or lesser number of shares of Common Stock, then in each such case 
the amount set forth in the preceding sentence with respect to the exchange 
or change of shares of Series B Preferred Stock shall be adjusted by 
multiplying such amount by a fraction, the numerator of which is the number 
of shares of Common Stock outstanding immediately after such event and the 
denominator of which is the number of shares of Common Stock that were 
outstanding immediately prior to such event.

              Section 8.    NO REDEMPTION.  The shares of Series B Preferred 
Stock shall not be redeemable.

              Section 9.    RANK.  The Series B Preferred Stock shall rank, 
with respect to the payment of dividends and the distribution of assets, 
junior to all series of any other class of the Corporation's Preferred Stock.

              Section 10.   AMENDMENT.  The Certificate of Incorporation of 
the Corporation shall not be amended in any manner which would materially 
alter or change the powers, preferences or special rights of the Series B 
Preferred Stock so as to affect them adversely without the affirmative vote 
of the holders of at least a majority of the outstanding shares of Series B 
Preferred Stock, voting together as a single class.

              IN WITNESS WHEREOF, this Certificate of Designation is executed 
on behalf of the Corporation by its Chief Financial Officer and Treasurer 
this ___ day of _________, 1999.




                                  -------------------------------------------
                                  Name:  James A. Klein, Jr. 
                                  Title:  Chief Financial Officer and Treasurer


                                      A-6
<PAGE>

                                                                       EXHIBIT B
                                          
                             Form of Rights Certificate

Certificate No. R-                                               ________ Rights

              NOT EXERCISABLE AFTER FEBRUARY 16, 2009 OR EARLIER
              IF REDEMPTION OR EXCHANGE OCCURS.  THE RIGHTS ARE
              SUBJECT TO REDEMPTION AT THE OPTION OF THE COMPANY
              AT $0.001 PER RIGHT AND TO EXCHANGE ON THE TERMS SET
              FORTH IN THE RIGHTS AGREEMENT.  UNDER CERTAIN
              CIRCUMSTANCES, RIGHTS BENEFICIALLY OWNED BY AN
              ACQUIRING PERSON OR AN AFFILIATE OR ASSOCIATE OF AN
              ACQUIRING PERSON (AS SUCH TERMS ARE DEFINED IN THE
              RIGHTS AGREEMENT) AND ANY SUBSEQUENT HOLDER OF SUCH
              RIGHTS MAY BECOME NULL AND VOID.  [THE RIGHTS
              REPRESENTED BY THIS RIGHTS CERTIFICATE ARE OR WERE
              BENEFICIALLY OWNED BY A PERSON WHO WAS OR BECAME AN
              ACQUIRING PERSON OR AN AFFILIATE OR ASSOCIATE OF AN
              ACQUIRING PERSON (AS SUCH TERMS ARE DEFINED IN THE
              RIGHTS AGREEMENT).  ACCORDINGLY, THIS RIGHTS
              CERTIFICATE AND THE RIGHTS REPRESENTED HEREBY
              MAY BECOME NULL AND VOID IN THE CIRCUMSTANCES
              SPECIFIED IN SUCH AGREEMENT.(1)]
                                          
                                 Rights Certificate
                                          
                           TRIANGLE PHARMACEUTICALS, INC.

              This certifies that ___________ , or registered assigns, is the 
registered owner of the number of Rights set forth above, each of which 
entitles the owner thereof, subject to the terms, provisions and conditions 
of the Rights Agreement, dated as of February 1, 1999 (the 

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

       (1)    The portion of the legend in bracket shall be inserted only if
applicable and shall replace the preceding sentence.


                                      B-1
<PAGE>

"Rights Agreement"), between Triangle Pharmaceuticals, Inc., a Delaware 
corporation (the "Company"), and American Stock Transfer & Trust Company (the 
"Rights Agent"), to purchase from the Company at any time after the 
Distribution Date (as such term is defined in the Rights Agreement) and prior 
to 5:00 P.M., New York time, on February 16, 2009, at the office of the 
Rights Agent designated for such purpose, or at the office of its successor 
as Rights Agent, one one-thousandth (a "Unit") of a fully paid non-assessable 
share of Series B Junior Participating Preferred Stock, par value $.001 per 
share (the "Series B Preferred Stock") of the Company, at a purchase price of 
$____.00 per Unit of Series B Preferred Stock (the "Purchase Price"), upon 
presentation and surrender of this Rights Certificate with the Form of 
Election to Purchase duly executed. The number of Rights evidenced by this 
Rights Certificate (and the number of Units of Series B Preferred Stock which 
may be purchased upon exercise hereof) set forth above, and the Purchase 
Price set forth above, are the number and Purchase Price as of February 16, 
1999 based on the Series B Preferred Stock as constituted at such date.  As 
provided in the Rights Agreement, the Purchase Price and the number of Units 
of Series B Preferred Stock which may be purchased upon the exercise of the 
Rights evidenced by this Rights Certificate are subject to modification and 
adjustment upon the happening of certain events. 

              This Rights Certificate is subject to all of the terms, 
provisions and conditions of the Rights Agreement, which terms, provisions 
and conditions are hereby incorporated herein by reference and made a part 
hereof and to which Rights Agreement reference is hereby made for a full 
description of the rights, limitations of rights, obligations, duties and 
immunities hereunder of the Rights Agent, the Company and the holders of the 
Rights Certificates.  Copies of the Rights Agreement are on file at the 
principal executive offices of the Company.

              This Rights Certificate, with or without other Rights 
Certificates, upon surrender at the office of the Rights Agent designated for 
such purpose, may be exchanged for another Rights Certificate or Rights 
Certificates of like tenor and date evidencing Rights entitling the holder to 
purchase a like aggregate number of Series B Preferred Stock as the Rights 
evidenced by the Rights Certificate or Rights Certificates surrendered shall 
have entitled such holder to purchase.  If this Rights Certificate shall be 
exercised in part, the holder shall be entitled to receive upon surrender 
hereof another Rights Certificate or Rights Certificates for the number of 
whole Rights not exercised.

              Subject to the provisions of the Rights Agreement, the Rights 
evidenced by this Certificate may be redeemed by the Company at a redemption 
price of $0.001 per Right.

              No fractional shares of Series B Preferred Stock will be issued 
upon the exercise of any Rights or Rights evidenced hereby (other than 
fractions which are integral multiples of one one-thousandth of a share of 
Series B Preferred Stock, which may, at the election of the Company, be 
evidenced by depositary receipts), but in lieu thereof a cash payment will be 
made, as provided in the Rights Agreement.

              No holder of this Rights Certificate, as such, shall be 
entitled to vote or receive dividends or be deemed for any purpose the holder 
of Units of Series B Preferred Stock or of any other securities of the 
Company which may at any time be issuable on the exercise hereof, nor shall 
anything contained in the Rights Agreement or herein be construed to confer 
upon the holder hereof, as such, any of the rights of a stockholder of the 
Company or any right to vote for 


                                      B-2
<PAGE>

the election of directors or upon any matter submitted to stockholders at any 
meeting thereof, or to give or withhold consent to any corporate action, or 
to receive notice of meetings or other actions affecting stockholders (except 
as provided in the Rights Agreement), or to receive dividends or subscription 
rights, or otherwise, until the Rights or Rights evidenced by this Rights 
Certificate shall have been exercised as provided in the Rights Agreement.

              This Rights Certificate shall not be valid or obligatory for 
any purpose until it shall have been countersigned by the Rights Agent.

              WITNESS the signature of the proper officers of the Company and 
its corporate seal.  Dated as of _____________________.



ATTEST:                                   TRIANGLE PHARMACEUTICALS, INC.



                                          By
- -----------------------------------         -----------------------------------
Name:                                        Name:  James A. Klein
Title:                                       Title: Chief Financial Officer and
                                                    Treasurer




Countersigned:

AMERICAN STOCK TRANSFER 
& TRUST COMPANY
as Rights Agent

By     
  ---------------------------------
    Authorized Signatory


                                      B-3
<PAGE>

                   Form of Reverse Side of Rights Certificate
                                          
                               FORM OF ASSIGNMENT

              (To be executed by the registered holder if such
              holder desires to transfer the Rights Certificate.)

          FOR VALUE RECEIVED __________________hereby sells, assigns and 
transfers unto

- --------------------------------------------------------------------------------
(Please print name and address of transferee)

this Rights Certificate, together with all right, title and interest therein, 
and does hereby irrevocably constitute and appoint ____________________ 
Attorney, to transfer the within Rights Certificate on the books of the 
within-named Company, with full power of substitution.

Dated: ________________, ____










                                     ---------------------------
                                              Signature

Signature Guaranteed:

              Signatures must be guaranteed by a participant in a Securities
Transfer Association Inc. recognized signature guarantee medallion program.


                                      B-2
<PAGE>

                                  CERTIFICATE

              The undersigned hereby certifies that the Rights evidenced by 
this Rights Certificate are not beneficially owned by an Acquiring Person or 
an Affiliate or Associate thereof (as defined in the Rights Agreement).


                                              --------------------------------
                                              Signature



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



                                        NOTICE

              The signature in the foregoing Form of Assignment must conform 
to the name as written upon the face of this Rights Certificate in every 
particular, without alteration or enlargement or any change whatsoever.

              In the event the certification set forth above in the Form of 
Assignment is not completed, the Company and the Rights Agent will deem the 
beneficial owner of the Rights evidenced by this Rights Certificate to be an 
Acquiring Person or an Affiliate or Associate thereof (as defined in the 
Rights Agreement) and such Assignment will not be honored.


                                      B-3
<PAGE>

                          FORM OF ELECTION TO PURCHASE

(To be executed if holder desires to exercise the Rights Certificate.)



To: TRIANGLE PHARMACEUTICALS, Inc.

              The undersigned hereby irrevocably elects to exercise 
________________ Rights represented by this Rights Certificate to purchase 
the units of Series B Junior Participating Preferred Stock issuable upon the 
exercise of such Rights and requests that certificates for such Series B 
Junior Participating Preferred Stock be issued in the name of:

Please insert social security
or other identifying number
                           -------------------------------------------------
                            (Please print name and address)

If such number of Rights shall not be all the Rights evidenced by this Rights 
Certificate, a new Rights Certificate for the balance remaining of such 
Rights shall be registered in the name of and delivered to:

Please insert social security
or other identifying number
                           -------------------------------------------------
                            (Please print name and address)



Dated ______________, _____



                                   --------------------------------------
                                                 Signature

Signature Guaranteed:

              Signatures must be guaranteed by a participant in a Securities 
Transfer Association Inc. recognized signature guarantee medallion program.

                                      B-4
<PAGE>

                                  CERTIFICATE

              The undersigned hereby certifies that the Rights evidenced by 
this Rights Certificate are not beneficially owned by an Acquiring Person or 
an Affiliate or Associate thereof (as defined in the Rights Agreement).


                                        ------------------------------
                                                  Signature



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



                                     NOTICE

              The signature in the foregoing Form of Election to Purchase 
must conform to the name as written upon the face of this Rights Certificate 
in every particular, without alteration or enlargement or any change 
whatsoever.

              In the event the certification set forth above in the Form of 
Election to Purchase, as the case may be, is not completed, the Company and 
the Rights Agent will deem the beneficial owner of the Rights evidenced by 
this Rights Certificate to be an Acquiring Person or an Affiliate or 
Associate thereof (as defined in the Rights Agreement) and such Election to 
Purchase will not be honored.


                                      B-5
<PAGE>

                                                                     EXHIBIT C
                                          
                           TRIANGLE PHARMACEUTICALS, INC.
                                          
                           SUMMARY OF RIGHTS TO PURCHASE
                                          
              SHARES OF SERIES B JUNIOR PARTICIPATING PREFERRED STOCK

              On January 29, 1999 the Board of Directors of Triangle 
Pharmaceuticals, Inc. (the "Company") declared a dividend of one preferred 
share purchase right (a "Right") for each outstanding share of Common Stock 
(the "Common Stock"), par value $.001 per share, of the Company.  In 
addition, the holders of outstanding Series A Preferred Stock will receive 
one Right for each share of Common Stock issuable upon conversion of the 
Series A Preferred Stock. The dividend is payable on February 16, 1999 (2) 
(the "Record Date") to the stockholders of record on that date.  Each Right 
entitles the registered holder to purchase from the Company one 
one-thousandth of a share (a "Unit") of Series B Junior Participating 
Preferred Stock, par value $.001 per share (the "Series B Preferred Stock"), 
of the Company at a price of $100 per Unit (the "Purchase Price"), subject to 
adjustment.  The description and terms of the Rights are set forth in a 
Rights Agreement dated as of February 1, 1999 (the "Rights Agreement") 
between the Company and American Stock Transfer & Trust Company, as Rights 
Agent (the "Rights Agent").

              Until the earlier of (i) the close of business on the first 
date of a public announcement that a person or group of affiliated or 
associated persons (an "Acquiring Person") have acquired beneficial ownership 
of 15% or more of the outstanding Common Stock and (ii) the close of business 
on the tenth business day (or such later date as may be determined by a 
majority of the Board of Directors prior to such time as any Person becomes 
an Acquiring Person) following the commencement of, or announcement of an 
intention to make, a tender offer or exchange offer the consummation of which 
would result in the beneficial ownership by a person or group of 15% or more 
of such outstanding Common Stock (the earlier of such dates being called the 
"Distribution Date"), the Rights will be evidenced, subject to certain 
conditions, with respect to any of the Common Stock certificates outstanding 
as of the Record Date, by such Common Stock certificate with a copy of this 
Summary of Rights attached thereto.

              The Rights Agreement provides that, until the Distribution 
Date, the Rights will be transferred with and only with the Common Stock.  
Until the Distribution Date (or earlier redemption or expiration of the 
Rights), new Common Stock certificates issued after the Record Date, upon 
transfer or new issuance of Common Stock will contain a notation 
incorporating the Rights Agreement by reference.  Until the Distribution Date 
(or earlier redemption or expiration of the Rights), the surrender for 
transfer of any certificates for Common Stock, outstanding as of 

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

  (2) Pursuant to Rule 10b-17, must be at least 10 days after Declaration Date.


                                      C-1
<PAGE>

the Record Date, even without such notation or a copy of this Summary of 
Rights being attached thereto, will also constitute the transfer of the 
Rights associated with the Common Stock represented by such certificate.  As 
soon as practicable following the Distribution Date, separate certificates 
evidencing the Rights ("Rights Certificates") will be mailed to holders of 
record of the Common Stock as of the Close of Business on the Distribution 
Date and such separate Rights Certificates alone will evidence the Rights.

              The Rights are not exercisable until the Distribution Date.  
The Rights will expire at the close of business on February 16, 2009 (the 
"Final Expiration Date"), unless the Final Expiration Date is extended or 
unless the Rights are earlier redeemed or exchanged by the Company, in each 
case as described below.

              The Purchase Price payable, and the number of Units of 
Preferred Stock or other securities or property issuable, upon exercise of 
the Rights are subject to adjustment from time to time to prevent dilution 
(i) in the event of a stock dividend on, or a subdivision, combination or 
reclassification of, the Preferred Stock, (ii) upon the grant to holders of 
the Units of Preferred Stock of certain rights or warrants to subscribe for 
or purchase Units of Preferred Stock at a price, or securities convertible 
into Units of Preferred Stock with a conversion price, less than the then 
current market price of the Units of Preferred Stock or (iii) upon the 
distribution to holders of the Units of Preferred Stock of evidences of 
indebtedness or assets (excluding regular periodic cash dividends paid out of 
earnings or retained earnings or dividends payable in Units of Preferred 
Stock) or of subscription rights or warrants (other than those referred to 
above).

              The number of outstanding Rights and the number of Units of 
Preferred Stock issuable upon exercise of each Right are also subject to 
adjustment in the event of a stock split of the Common Stock or a stock 
dividend on the Common Stock payable in Common Stock or subdivisions, 
consolidations or combinations of the Common Stock occurring, in any such 
case, prior to the Distribution Date.

              Units of Preferred Stock purchasable upon exercise of the 
Rights will not be redeemable.  Each Unit of Preferred Stock will be entitled 
to a dividend equal to any dividend declared per share of Common Stock.  In 
the event of liquidation, each Unit of Preferred Stock will be entitled to a 
payment equal to any payment made per share of Common Stock.  Each Unit of 
Preferred Stock will have one vote, voting together with the Common Stock.  
Finally, in the event of any merger, consolidation or other transaction in 
which shares of Common Stock are exchanged, each Unit of Preferred Stock will 
be entitled to receive an amount equal to the amount received per share of 
Common Stock.  These rights are protected by customary antidilution 
provisions.

              Because of the nature of the dividend, liquidation and voting 
rights, the value of each Unit of Preferred Stock purchasable upon exercise 
of the Rights should approximate the value of one share of Common Stock.

              In the event that, after the Rights become exercisable, the 
Company is acquired in a merger or other business combination transaction 
with an Acquiring Person or an affiliate thereof, or 50% or more of its 
consolidated assets or earning power are sold to an Acquiring Person or an 
affiliate thereof, proper provision will be made so that each holder of a 
Right will 


                                      C-2
<PAGE>

thereafter have the right to receive, upon exercise thereof at the then 
current exercise price of the Rights, that number of shares of common stock 
of the acquiring company which at the time of such transaction will have a 
market value of two times the exercise price of the Rights.

              In the event that any person or group of affiliated or 
associated persons becomes the beneficial owner of 15% or more of the 
outstanding shares of Common Stock proper provision shall be made so that 
each holder of a Right, other than Rights beneficially owned by the Acquiring 
Person (which will thereafter be void), will thereafter have the right to 
receive upon exercise that number of shares of Units of Preferred Stock (or 
cash, common stock, other securities or property) having a market value of 
two times the exercise price of the Rights.

              At any time after the acquisition by a person or group of 
affiliated or associated persons of beneficial ownership of 15% or more of 
the outstanding shares of Common Stock and prior to the acquisition by such 
person or group of 50% or more of the outstanding Common Stock, the Board of 
Directors of the Company may exchange all or part of the Rights (other than 
Rights owned by such person or group which have become void) for Units of 
Preferred Stock at an exchange ratio of (subject to adjustment) which shall 
equal, subject to adjustment to reflect stock splits, stock dividends and 
similar transactions occurring after the date hereof, that number obtained by 
dividing the Purchase Price by the then current per share market price per 
Unit of Preferred Stock on the earlier of (i) the date on which any Person 
becomes an Acquiring Person and (ii) the date on which a tender or exchange 
offer is announced by any Person, if upon consummation thereof such Person 
would be the Beneficial Owner of 15% or more of the shares of Company Common 
Stock then outstanding.

              With certain exceptions, no adjustment in the Purchase Price 
will be required until cumulative adjustments require an adjustment of at 
least 1% in such Purchase Price.  No fractional shares of Preferred Stock 
will be issued (other than fractions which are integral multiples of one 
one-thousandth of a share of Preferred Stock, which may, at the election of 
the Company, be evidenced by depositary receipts) and, in lieu thereof, an 
adjustment in cash will be made based on the market price of the Units of 
Preferred Stock on the last trading day prior to the date of exercise.

              The Company may, at its option, upon approval by a majority of 
the Board of Directors, at any time prior to the earlier of (i) the Shares 
Acquisition Date, or (ii) the close of business on the tenth anniversary of 
the Rights Agreement redeem the Rights in whole, but not in part, at a price 
of $0.001 per Right (the "Redemption Price").  The redemption of the rights 
may be made effective at such time on such basis and with such conditions as 
the Board of Directors in its sole discretion may establish.  Immediately 
upon any redemption of the Rights, the right to exercise the Rights will 
terminate and the only right of the holders of Rights will be to receive the 
Redemption Price. The Rights are also redeemable under other circumstances as 
specified in the Rights Agreement.

              The terms of the Rights may be amended by the Board of 
Directors of the Company without the consent of the holders of the Rights 
upon the approval of a majority of the Board of Directors except that from 
and after a Distribution Date no such amendment may adversely affect the 
interests of the holders of the Rights.


                                      C-3
<PAGE>

              Until a Right is exercised, the holder thereof, as such, will 
have no rights as a stockholder of the Company, including, without 
limitation, the right to vote or to receive dividends.

              The Rights have certain anti-takeover effects.  The Rights will 
cause substantial dilution to a person or group that attempts to acquire the 
Company on terms not approved by the Company's Board of Directors, except 
pursuant to an offer conditioned on a substantial number of rights being 
acquired.  The Rights should not interfere with any merger or other business 
combination approved by the Board of Directors because the Rights may be 
redeemed by the Company at the Redemption Price prior to the occurrence of a 
Distribution Date.

              A copy of the Rights Agreement has been filed with the 
Securities and Exchange Commission as an Exhibit to a Registration Statement 
on Form 8-A. A copy of the Rights Agreement is available free of charge from 
the Company. This summary description of the Rights does not purport to be 
complete and is qualified in its entirety by reference to the Rights 
Agreement, which is hereby incorporated herein by reference.



                                      C-4


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