PFIZER INC
SC 14D1, 1996-04-17
PHARMACEUTICAL PREPARATIONS
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<PAGE>
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
                                 SCHEDULE 14D-1
 
              TENDER OFFER STATEMENT PURSUANT TO SECTION 14(D)(1)
                   OF THE SECURITIES AND EXCHANGE ACT OF 1934
                                      AND
                                  SCHEDULE 13D
                   UNDER THE SECURITIES EXCHANGE ACT OF 1934
                            ------------------------
                              CORVITA CORPORATION
                           (Name of Subject Company)
                             HPG ACQUISITION CORP.
                                  PFIZER INC.
                                ---------------
                                   (Bidders)
                         COMMON STOCK, $.001 PAR VALUE
                         (Title of Class of Securities)
                                  221010 10 1
                            ------------------------
                                 (CUSIP Number)
 
                              PAUL S. MILLER, ESQ.
                   SENIOR VICE PRESIDENT AND GENERAL COUNSEL
                                  PFIZER INC.
                              235 EAST 42ND STREET
                         NEW YORK, NEW YORK 10017-5755
                                 (212) 573-2323
 
            (Name, Address and Telephone Number of Person Authorized
          to Receive Notices and Communications on Behalf of Bidders)
 
                                   Copies to:
                             DENNIS J. BLOCK, ESQ.
                           WEIL, GOTSHAL & MANGES LLP
                                767 FIFTH AVENUE
                            NEW YORK, NEW YORK 10153
                            ------------------------
                                 APRIL 17, 1996
            (Date of Event which Requires Filing of this Statement)
                           CALCULATION OF FILING FEE
 
<TABLE>
<CAPTION>
                                                                               AMOUNT OF
TRANSACTION VALUATION**                                                       FILING FEE
<S>                                                                         <C>
$86,166,461                                                                    $  17,250
</TABLE>
 
**  Estimated for purposes of calculating the amount of the filing fee only. The
    amount  assumes the purchase of 7,106,149  shares of common stock, $.001 par
    value (the "Shares"), and  a maximum of 1,300,335  Shares issuable upon  the
    exercise  of options and warrants,  at a price per  Share of $10.25 in cash.
    Such number of Shares represents all  the Shares outstanding as of April  4,
    1996  and  assumes the  exercise  of all  existing  options and  warrants to
    acquire Shares from the Company.
 
/ / Check box if any part of this  fee is offset as provided by Rule  0-11(a)(2)
    and  identify the filing with which  the offsetting fee was previously paid.
    Identify the previous filing by  registration statement number, or the  form
    or schedule and the date of its filing.
 
    Amount Previously Paid: None                    Filing Party: Not Applicable
    Form or Registration No.: Not Applicable          Date Filed: Not Applicable
 
                               Page 1 of __ Pages
                     (Exhibit Index is located on Page __)
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<PAGE>
                                  TENDER OFFER
 
    This  Tender Offer Statement  on Schedule 14D-1 is  filed by HPG Acquisition
Corp. ("Purchaser"),  a  Florida  corporation, and  Pfizer  Inc.  ("Parent"),  a
Delaware  corporation and  the direct  owner of  all of  the outstanding capital
stock of  Purchaser,  relating  to  the  offer  by  Purchaser  to  purchase  all
outstanding  shares of common stock, $.001  par value (the "Shares"), of Corvita
Corporation (the "Company"), at $10.25 per Share, net to the seller in cash,  on
the  terms and  subject to the  conditions set  forth in the  Offer to Purchase,
dated April 17, 1996  (the "Offer to  Purchase"), and in  the related Letter  of
Transmittal  and  any amendments  or supplements  thereto,  copies of  which are
attached hereto as Exhibits (a)(1) and (a)(2), respectively (which  collectively
constitute the "Offer").
 
    This  Tender Offer Statement on Schedule  14D-1 also constitutes a Statement
on Schedule  13D with  respect to  the acquisition  by Parent  and Purchaser  of
beneficial  ownership of the Selling Shareholders'  Shares. The item numbers and
responses thereto  below are  in accordance  with the  requirements of  Schedule
14D-1.
 
ITEM 1.  SECURITY AND SUBJECT COMPANY
 
    (a)  The  name of  the  subject company  is  Corvita Corporation,  a Florida
corporation (the "Company").  The address of  the Company's principal  executive
offices is 8210 N.W. 27th Street, Miami, Florida 33122.
 
    (b)  The information set forth on the cover page and under "Introduction" in
the Offer to Purchase is incorporated herein by reference.
 
    (c) The information  set forth  in Section  6 of  the Offer  to Purchase  is
incorporated herein by reference.
 
ITEM 2.  IDENTITY AND BACKGROUND
 
    This  Statement is filed by Purchaser  and Parent. The information set forth
on the cover page, under "Introduction," in  Section 9 and in Schedule I of  the
Offer to Purchase is incorporated herein by reference.
 
ITEM 3.  PAST CONTRACTS, TRANSACTIONS, OR NEGOTIATIONS WITH THE SUBJECT COMPANY
 
    (a)  The information  set forth in  Section 11  of the Offer  to Purchase is
incorporated herein by reference.
 
    (b) The information set forth under "Introduction" and in Sections 9, 11 and
12 of the Offer to Purchase is incorporated herein by reference.
 
ITEM 4.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION
 
    (a)-(b) The information set forth in Section 10 of the Offer to Purchase  is
incorporated herein by reference.
 
    (c) Not applicable.
 
ITEM 5.  PURPOSE OF THE TENDER OFFER AND PLANS OR PROPOSALS OF THE BIDDER
 
    (a)-(e)  The information set forth in Section 12 of the Offer to Purchase is
incorporated herein by reference.
 
    (f)-(g) The information set forth in Section  7 of the Offer to Purchase  is
incorporated herein by reference.
 
ITEM 6.  INTEREST IN SECURITIES OF THE SUBJECT COMPANY
 
    (a)-(b) The information set forth under "Introduction" and in Sections 9, 11
and 12 of the Offer to Purchase is incorporated herein by reference.
 
ITEM 7.  CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT
TO THE SUBJECT COMPANY'S SECURITIES
 
    The information set forth under "Introduction" and in Sections 9, 11, 12 and
13 of the Offer to Purchase is incorporated herein by reference.
 
                              Page __ of __ Pages
<PAGE>
ITEM 8.  PERSONS RETAINED, EMPLOYED OR TO BE COMPENSATED
 
    The  information set  forth under  "Introduction" and  in Section  16 of the
Offer to Purchase is incorporated herein by reference.
 
ITEM 9.  FINANCIAL STATEMENTS TO CERTAIN BIDDERS
 
    The information  set  forth  in  Section  9 of  the  Offer  to  Purchase  is
incorporated herein by reference.
 
ITEM 10.  ADDITIONAL INFORMATION
 
    (a) The information set forth under "Introduction" and in Sections 11 and 12
of the Offer to Purchase is incorporated herein by reference.
 
    (b)-(c)  The information set forth in Section 15 of the Offer to Purchase is
incorporated herein by reference.
 
    (d) The information  set forth  in Section  7 of  the Offer  to Purchase  is
incorporated herein by reference.
 
    (e) Not applicable.
 
    (f)  The information set  forth in the  Offer to Purchase  and the Letter of
Transmittal, copies of which are attached hereto as Exhibits (a)(1) and  (a)(2),
respectively, is incorporated herein by reference.
 
ITEM 11.  MATERIAL TO BE FILED AS EXHIBITS
 
<TABLE>
<S>        <C>
(a)(1)     Offer to Purchase, dated April 17, 1996
 
(a)(2)     Letter of Transmittal
 
(a)(3)     Notice of Guaranteed Delivery
 
(a)(4)     Letter to Brokers, Dealers, Commercial Banks, Trust Companies and Other
            Nominees
 
(a)(5)     Letter to Clients for use by Brokers, Dealers, Commercial Banks, Trust
            Companies and Other Nominees
 
(a)(6)     Guidelines for Certification of Taxpayer Identification Number on
            Substitute Form W-9
 
(a)(7)     Form of Summary Advertisement, dated April 17, 1996
 
(c)(1)     Agreement and Plan of Merger, dated as of April 11, 1996, among Parent,
            Purchaser, and the Company
 
(c)(2)     Shareholders Agreement, dated as of April 11, 1996, among Parent,
            Purchaser, and the Selling Shareholders
 
(c)(3)     Promissory Note, dated April 11, 1996, from the Company to Parent
 
(c)(4)     Letter Agreement, dated April 11, 1996, from Parent to the Company
            relating to the loan to the Company
 
(c)(5)     License Agreement, dated April 11, 1996, between Parent and the Company
 
(c)(6)     Joint Press Release, dated April 11, 1996, by Parent and the Company
 
(c)(7)     Confidentiality and Standstill Agreement, dated August 16, 1995, between
            Dillon, Read & Co. Inc., on behalf of the Company, and Parent
</TABLE>
 
                              Page __ of __ Pages
<PAGE>
<TABLE>
<S>        <C>
(d)        None
 
(e)        Not applicable
 
(f)        None
</TABLE>
 
                              Page __ of __ Pages
<PAGE>
                                 SCHEDULE 14D-1
 
CUSIP No. 221010 10 1
 
<TABLE>
<C>        <S>
        1  NAME OF REPORTING PERSONS
            HPG Acquisition Corp.
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
            Applied For
 
        2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / /
           (b) / /
 
        3  SEC USE ONLY
 
        4  SOURCE OF FUNDS
           AF
 
        5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(E) OR
            2(F)                                         / /
           N/A
 
        6  CITIZENSHIP OR PLACE OF ORGANIZATION
           State of Florida
 
        7  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
           1,487,291*
 
        8  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (7) EXCLUDES CERTAIN
            SHARES                                                        / /
           N/A
 
        9  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (7)
           21%*
 
       10  TYPE OF REPORTING PERSON
            CO
</TABLE>
 
* On  April 11,  1996, Pfizer Inc.,  a Delaware corporation  ("Parent"), and HPG
  Acquisition Corp., a Florida corporation and a direct wholly-owned  subsidiary
  of   Parent  ("Purchaser"),   entered  into  a   Shareholders  Agreement  (the
  "Shareholders Agreement")  with certain  shareholders of  Corvita  Corporation
  (collectively,  the  "Selling Shareholders"),  pursuant  to which  the Selling
  Shareholders have agreed to validly tender  (and not to withdraw) pursuant  to
  and in accordance with the terms of the Offer all of the Shares owned by them.
  The  Selling Shareholders own 1,487,291 Shares, representing approximately 21%
  of the  Company's  outstanding  common  stock (or  approximately  18%  of  the
  outstanding  Shares on  a fully diluted  basis). Pursuant  to the Shareholders
  Agreement, the Selling Shareholders.  The Shareholders Agreement is  described
  more fully in Section 12 of the Offer to Purchase, dated April 17, 1996.
 
                              Page __ of __ Pages
<PAGE>
                                 SCHEDULE 14D-1
 
CUSIP No. 221010 10 1
 
<TABLE>
<C>        <S>
        1  NAME OF REPORTING PERSONS
            Pfizer Inc.
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
            13-5315170
 
        2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / /
           (b) / /
 
        3  SEC USE ONLY
 
        4  SOURCE OF FUNDS
           OO
 
        5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(E) OR
            2(F)                                         / /
           N/A
 
        6  CITIZENSHIP OR PLACE OF ORGANIZATION
           State of Delaware
 
        7  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
            1,487,291*
 
        8  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (7) EXCLUDES CERTAIN
            SHARES                                                        / /
           N/A
 
        9  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (7)
            21%*
 
       10  TYPE OF REPORTING PERSON
            CO
</TABLE>
 
* The footnote on page 2 is incorporated by reference herein.
 
                              Page __ of __ Pages
<PAGE>
                                   SIGNATURES
 
    After due inquiry and to the best of my knowledge and belief, I certify that
the information set forth in this statement is true, complete and correct.
 
Dated: April 17, 1996
 
                                          PFIZER INC.
                                          By: /s/ Paul S. Miller
                                              Name: Paul S. Miller
                                             Title: Executive Vice President
                                              General Counsel
 
                                          HPG ACQUISITION CORP.
                                          By: /s/ George A. Stewart_____________
                                              Name: George A. Stewart
                                             Title: President
<PAGE>
                                 EXHIBIT INDEX
 
<TABLE>
<CAPTION>
 EXHIBIT                                             DESCRIPTION                                               PAGE
- ---------  ------------------------------------------------------------------------------------------------  ---------
<S>        <C>                                                                                               <C>
(a)(1)     Offer to Purchase, dated April 17, 1996.........................................................
(a)(2)     Letter of Transmittal...........................................................................
(a)(3)     Notice of Guaranteed Delivery...................................................................
(a)(4)     Letter to Brokers, Dealers, Commercial Banks, Trust Companies and Other Nominees................
(a)(5)     Letter to Clients for use by Brokers, Dealers, Commercial Banks, Trust Companies and Other
            Nominees.......................................................................................
(a)(6)     Guidelines for Certification of Taxpayer Identification Number on Substitute Form W-9...........
(a)(7)     Form of Summary Advertisement, dated April 17, 1996.............................................
(c)(1)     Agreement and Plan of Merger, dated as of April 11, 1996, among Parent, Purchaser and the
            Company........................................................................................
(c)(2)     Shareholders Agreement, dated as of April 11, 1996, among Parent, Purchaser and the Selling
            Shareholders...................................................................................
(c)(3)     Promissory Note, dated April 11, 1996, from the Company to Parent
(c)(4)     Letter Agreement, dated April 11, 1996, from Parent to the Company relating to the loan to the
            Company
(c)(5)     License Agreement, dated April 11, 1996, between Parent and the Company
(c)(6)     Joint Press Release, dated April 11, 1996, by Parent and the Company
(c)(7)     Confidentiality and Standstill Agreement, dated August 16, 1995, between Dillon, Read & Co.
            Inc., on behalf of the Company, and Parent
(d)        None............................................................................................
(e)        Not Applicable..................................................................................
(f)        None............................................................................................
</TABLE>
 
                              Page __ of __ Pages

<PAGE>
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                                                     PAGE
                                                                                                                     -----
<C>        <S>                                                                                                    <C>
INTRODUCTION....................................................................................................           1
       1.  Terms of the Offer...................................................................................           2
       2.  Acceptance for Payment and Payment for Shares........................................................           4
       3.  Procedure for Tendering Shares.......................................................................           5
       4.  Withdrawal Rights....................................................................................           7
       5.  Certain Federal Income Tax Consequences of the Offer and the Merger..................................           9
       6.  Price Range of the Shares; Dividends on the Shares...................................................           9
       7.  Effect of the Offer on the Market for the Shares, Stock Quotation and Exchange Act Registration and
            Margin Securities...................................................................................          10
       8.  Certain Information Concerning the Company...........................................................          11
       9.  Certain Information Concerning Purchaser and Parent..................................................          13
      10.  Source and Amount of Funds...........................................................................          14
      11.  Background of the Offer..............................................................................          15
      12.  Purpose of the Offer and the Merger; Plans for the Company; the Merger Agreement; the Shareholders
            Agreement...........................................................................................          17
      13.  Dividends and Distributions..........................................................................          30
      14.  Certain Conditions of the Offer......................................................................          31
      15.  Certain Legal Matters................................................................................          33
      16.  Fees and Expenses....................................................................................          34
      17.  Miscellaneous........................................................................................          34
</TABLE>
 
                                       i
<PAGE>
To the Holders of Common Stock of
 Corvita Corporation:
 
                                  INTRODUCTION
 
    HPG Acquisition Corp., a Florida corporation ("Purchaser"), hereby offers to
purchase  all the outstanding shares of common  stock, $.001 par value per share
(the "Shares"), of Corvita Corporation,  a Florida corporation (the  "Company"),
at  a purchase price of $10.25 per Share (such amount, or any greater amount per
share paid pursuant to the Offer (as defined below), being hereinafter  referred
to  as the "Offer Price"), net to the seller in cash, upon the terms and subject
to the conditions set forth in this Offer to Purchase and in the related  Letter
of  Transmittal (which,  together with any  amendments or  supplements hereto or
thereto,  collectively   constitute  the   "Offer").  Purchaser   is  a   direct
wholly-owned subsidiary of Pfizer Inc., a Delaware corporation ("Parent").
 
    The  Offer is being made pursuant to  an Agreement and Plan of Merger, dated
as of April 11, 1996 (the  "Merger Agreement"), among Parent, Purchaser and  the
Company. The Merger Agreement provides, among other things, for the commencement
of  the Offer  by Purchaser  and further  provides that,  after the  purchase of
Shares pursuant  to the  Offer and  subject  to the  satisfaction or  waiver  of
certain conditions set forth therein, Purchaser will be merged with and into the
Company  (the  "Merger"), with  the  Company surviving  the  Merger as  a direct
wholly-owned subsidiary of Parent (the "Surviving Corporation"). In the  Merger,
each  outstanding Share (excluding Shares owned,  directly or indirectly, by the
Company or any subsidiary of  the Company or by  Parent, Purchaser or any  other
subsidiary  of Parent and  Shares owned by shareholders  who shall have properly
exercised their appraisal  rights under Florida  law) will be  converted at  the
effective  time of the Merger  (the "Effective Time") into  the right to receive
the Offer Price in cash, without interest (the "Merger Consideration"), less any
required withholding taxes.
 
    THE BOARD OF DIRECTORS OF THE COMPANY (THE "BOARD") HAS DETERMINED THAT  THE
OFFER AND THE MERGER ARE FAIR TO, AND IN THE BEST INTERESTS OF, THE SHAREHOLDERS
OF  THE COMPANY  (THE "SHAREHOLDERS"),  HAS APPROVED  THE MERGER  AGREEMENT, THE
SHAREHOLDERS AGREEMENT (AS DEFINED BELOW), AND  THE OFFER AND THE MERGER IN  ALL
RESPECTS  AND RECOMMENDS THAT THE SHAREHOLDERS ACCEPT THE OFFER AND TENDER THEIR
SHARES PURSUANT THERETO.
 
    DILLON, READ & CO., INC.,  THE COMPANY'S FINANCIAL ADVISOR ("DILLON  READ"),
HAS  DELIVERED  TO THE  BOARD ITS  WRITTEN OPINION  THAT THE  OFFER PRICE  TO BE
RECEIVED BY THE SHAREHOLDERS PURSUANT TO THE OFFER AND THE MERGER IS FAIR,  FROM
A  FINANCIAL POINT OF VIEW, TO SUCH  SHAREHOLDERS. A COPY OF THE WRITTEN OPINION
OF  DILLON  READ  IS  CONTAINED  IN  THE  COMPANY'S  SOLICITATION/RECOMMENDATION
STATEMENT ON SCHEDULE 14D-9 (THE "SCHEDULE 14D-9") FILED WITH THE SECURITIES AND
EXCHANGE  COMMISSION (THE "COMMISSION") IN CONNECTION  WITH THE OFFER, A COPY OF
WHICH IS  BEING  FURNISHED  TO  SHAREHOLDERS CONCURRENTLY  WITH  THIS  OFFER  TO
PURCHASE.
 
    THE  OFFER  IS CONDITIONED  UPON, AMONG  OTHER  THINGS, THERE  BEING VALIDLY
TENDERED AND NOT WITHDRAWN PRIOR TO THE EXPIRATION DATE (AS DEFINED IN SECTION 1
HEREOF) THAT NUMBER OF  SHARES (THE "MINIMUM NUMBER  OF SHARES") REPRESENTING  A
MAJORITY  OF THE  SHARES OUTSTANDING  ON A  FULLY DILUTED  BASIS ON  THE DATE OF
PURCHASE (THE "MINIMUM TENDER CONDITION"). THE OFFER ALSO IS SUBJECT TO  CERTAIN
OTHER CONDITIONS. SEE SECTIONS 1 AND 14 HEREOF.
 
    The  Company  has  represented  and warranted  to  Purchaser  in  the Merger
Agreement that, at the close of business on April 4, 1996, 7,106,149 Shares were
issued and outstanding, 808,636  Shares were reserved  for issuance pursuant  to
outstanding  stock options granted by the Company to key employees and directors
(the "Company  Stock Options")  and 491,699  Shares were  reserved for  issuance
pursuant  to  certain  outstanding warrants  to  purchase Shares  issued  by the
Company (the "Company Warrants").
 
    As an inducement  and a  condition to  entering into  the Merger  Agreement,
Parent  required  certain  Shareholders (the  "Selling  Shareholders"),  and the
Selling Shareholders agreed, to enter into a Shareholders Agreement, dated as of
April 11, 1996 (the "Shareholders Agreement"). Pursuant to
 
                                       1
<PAGE>
the Shareholders  Agreement, the  Selling Shareholders  have agreed  to  validly
tender (and not to withdraw) pursuant to and in accordance with the terms of the
Offer  an aggregate of  1,487,291 Shares, representing  approximately 21% of the
outstanding Shares (or approximately 18% of the outstanding Shares calculated on
a fully diluted basis) that are owned by them (the "Option Shares"). The  tender
of  the Option Shares by the Selling  Shareholders will not itself be sufficient
to satisfy the Minimum Tender Condition. See Section 12 hereof.
 
    The consummation of the Merger is subject to the satisfaction or waiver of a
number of conditions, including, if required, the approval of the Merger by  the
requisite  vote  or  consent of  the  Shareholders. Under  the  Florida Business
Corporation Act  (the "FBCA"),  the Shareholder  vote necessary  to approve  the
Merger will be the affirmative vote of the holders of at least a majority of the
outstanding  Shares, including Shares  held by Purchaser  and its affiliates. If
the Minimum Tender  Condition is satisfied  and Purchaser purchases  at least  a
majority  of  the outstanding  Shares on  a  fully diluted  basis in  the Offer,
Purchaser will be able to effect the Merger without the affirmative vote of  any
other  Shareholder. If Purchaser acquires at least 80% of the outstanding Shares
pursuant to the Offer or otherwise, Purchaser will be able to effect the  Merger
pursuant  to the "short-form" merger provisions of Section 607.1104 of the FBCA,
without prior notice to, or any action by, any other Shareholder. In that event,
Purchaser has agreed to effect the  Merger as promptly as practicable  following
the purchase of Shares in the Offer. See Section 12 hereof.
 
    The Merger Agreement and the Shareholders Agreement are more fully described
in  Section 12  below. Certain  federal income tax  consequences of  the sale of
Shares pursuant  to  the  Offer  and  the exchange  of  Shares  for  the  Merger
Consideration pursuant to the Merger are described in Section 5 below.
 
    Tendering  Shareholders  will  not be  obligated  to pay  brokerage  fees or
commissions or,  except  as  set  forth  in  Instruction  6  to  the  Letter  of
Transmittal,  transfer taxes on the purchase of  Shares pursuant to the Offer or
Merger. Purchaser will pay all charges and  expenses of Lazard Freres & Co.  LLC
("Lazard  Freres"),  as the  Dealer Manager  (the  "Dealer Manager"),  The Chase
Manhattan Bank (National Association), as the depositary (the "Depositary"), and
Morrow &  Co., Inc.,  as the  information agent  (the "Information  Agent"),  in
connection with the Offer. See Section 16 hereof.
 
1.  TERMS OF THE OFFER
 
    Upon the terms and subject to the conditions of the Offer (including, if the
Offer  is extended or amended, the terms and conditions of any such extension or
amendment), Purchaser will accept for payment (and thereby purchase) all  Shares
that  are validly tendered and not withdrawn  in accordance with Section 4 below
prior to the Expiration Date. As used  in the Offer, the term "Expiration  Date"
means  12:00 midnight, New York City time,  on Tuesday, May 14, 1996, unless and
until Purchaser,  in accordance  with the  terms  of the  Offer and  the  Merger
Agreement,  shall have  extended the  period of time  during which  the Offer is
open, in which event the term "Expiration  Date" means the latest time and  date
at  which the Offer, as so extended, expires. As used in this Offer to Purchase,
"business day"  has  the  meaning  set  forth  in  Rule  14d-1(c)(6)  under  the
Securities Exchange Act of 1934, as amended (the "Exchange Act").
 
    In  the  event that  the Offer  is  not consummated,  Purchaser may  seek to
acquire Shares through open market purchases, privately negotiated  transactions
or  otherwise, upon  such terms and  conditions and  at such prices  as it shall
determine, which may be more or less than the Offer Price and could be for  cash
or other consideration. See Section 12 hereof.
 
    The  Offer  is conditioned  upon, among  other  things, satisfaction  of the
Minimum Tender Condition. The Offer also is subject to certain other  conditions
set  forth in Section 14  below. Pursuant to the  terms of the Merger Agreement,
Purchaser expressly reserves the right (but will not be obligated) to waive  any
or  all of  the conditions  of the  Offer. Subject  to the  terms of  the Merger
Agreement, if by the Expiration Date any  or all of the conditions of the  Offer
are  not satisfied or  waived, but, in  the reasonable belief  of Parent, may be
satisfied prior to August 9, 1996, Purchaser will extend the Expiration Date for
an additional period  or periods  until the  earlier of  (i) the  date all  such
conditions  are  met or  waived and  Purchaser becomes  obligated to  accept for
payment and pay for shares tendered
 
                                       2
<PAGE>
pursuant to the Offer  or (ii) the  date the Merger  Agreement is terminated  in
accordance  with its terms.  In addition, Purchaser may,  without the consent of
the Company, extend the Offer  on one occasion, following  the time that all  of
the  conditions to the Offer have been  satisfied as of the scheduled expiration
date for the Offer for a period not to exceed 10 business days, if the number of
Shares tendered, when added to  any Shares owned by  Parent or Purchaser or  any
other  wholly-owned  subsidiary  of  Parent,  is less  than  80%  of  the Shares
outstanding on  the  scheduled expiration  date  of the  Offer.  Notwithstanding
anything  to  the  contrary contained  in  the Merger  Agreement,  Purchaser may
without the  consent of  the Company,  extend the  Offer so  as to  comply  with
applicable  rules and regulations of the Commission. Any individual extension of
the Offer will be for a period of no more than 10 business days.
 
    Subject to the terms of  the Merger Agreement, Purchaser expressly  reserves
the  right, subject to applicable law, to extend the period of time during which
the Offer is  open by giving  oral or written  notice of such  extension to  the
Depositary  and by making a public announcement  of such extension. There can be
no assurance  that  Purchaser will  exercise  any  right to  extend  the  Offer.
Purchaser   also  expressly  reserves  the  right,  subject  to  applicable  law
(including applicable rules and regulations of the Commission) and the terms  of
the  Merger Agreement, at any time or from time to time, to (i) delay acceptance
for payment of,  or payment for,  any Shares, regardless  of whether the  Shares
were  theretofore accepted for payment, or to terminate the Offer and not accept
for payment or pay for any Shares  not theretofore accepted for payment or  paid
for,  upon the occurrence of any of the conditions specified in Section 14 below
by giving oral or written notice of such delay in payment or termination to  the
Depositary,  and (ii) waive any  conditions or otherwise amend  the Offer in any
respect, by giving  oral or  written notice  to the  Depositary. Any  extension,
delay  in  payment, termination  or amendment  will be  followed as  promptly as
practical by public announcement, the announcement  in the case of an  extension
to  be issued no later than 9:00 a.m.,  New York City time, on the next business
day after the previously scheduled Expiration Date. Without limiting the  manner
in  which Purchaser may  choose to make any  public announcement, Purchaser will
have no  obligation to  publish,  advertise or  otherwise communicate  any  such
announcement,  other than by issuing a release  to the Dow Jones News Service or
as otherwise required by law. The reservation by Purchaser of the right to delay
acceptance for payment of or payment for Shares is subject to the provisions  of
Rule  14e-1(c) under  the Exchange  Act, which  requires that  Purchaser pay the
consideration offered  or  return  the  Shares deposited  by  or  on  behalf  of
Shareholders promptly after the termination or withdrawal of the Offer.
 
    Pursuant  to the Merger Agreement, Purchaser expressly reserves the right to
increase the price per Share payable in  the Offer or to make any other  changes
in  the terms and conditions of the Offer, except without the written consent of
the Company, Purchaser shall not  (i) reduce the number  of Shares sought to  be
purchased  pursuant to the Offer, (ii) reduce the price per Share payable in the
Offer, (iii) change  the form of  consideration to  be paid in  the Offer,  (iv)
impose  additional conditions to the Offer or  amend any other term of the Offer
in any  manner  adverse  to  the  holders  of  Shares  or  (v)  amend  or  waive
satisfaction of the Minimum Tender Condition. Assuming the prior satisfaction or
waiver  of the conditions to  the Offer, Purchaser will  accept for payment, and
pay for, in accordance with the terms of the Offer, all Shares validly  tendered
and  not properly withdrawn pursuant to  the Offer promptly after the Expiration
Date.
 
    If Purchaser  makes a  material change  in the  terms of  the Offer  or  the
information  concerning the Offer  or waives a material  condition of the Offer,
Purchaser will  disseminate additional  tender offer  materials and  extend  the
Offer  to the extent  required by Rules  14d-4(c), 14d-6(d) and  14e-1 under the
Exchange Act.  The  minimum  period  during which  an  offer  must  remain  open
following  material changes in the terms  of the Offer or information concerning
the Offer, other than a change in price or a change in percentage of  securities
sought,  will depend upon  the facts and  circumstances then existing, including
the relative  materiality of  the  changed terms  or information.  If  Purchaser
decides  to increase or, subject to the  consent of the Company, to decrease the
consideration in the Offer, to make a change in the percentage of Shares  sought
or, subject to the consent of the Company, to change or waive the Minimum Tender
Condition  and, if,  at the  time that notice  of any  such change  or waiver is
 
                                       3
<PAGE>
first published, sent or given to Shareholders, the Offer is scheduled to expire
at any time earlier than the tenth  business day after (and including) the  date
of that notice, the Offer will be extended at least until the expiration of that
period of ten business days.
 
    The  Company has provided  Purchaser with its  shareholder list and security
position listings for the  purpose of disseminating  the Offer to  Shareholders.
This  Offer to  Purchase, the related  Letter of Transmittal  and other relevant
materials will be mailed to  record holders of Shares  and will be furnished  to
brokers,  dealers, commercial banks,  trust companies and  similar persons whose
names, or the names of whose  nominees, appear on the Company' shareholder  list
or,  if  applicable,  who are  listed  as  participants in  a  clearing agency's
security position listing  for subsequent  transmittal to  beneficial owners  of
Shares.
 
2.  ACCEPTANCE FOR PAYMENT AND PAYMENT FOR SHARES
 
    Upon the terms and subject to the conditions of the Merger Agreement and the
Offer  (including, if the Offer is extended or amended, the terms and conditions
of any such extension or amendment), Purchaser will accept for payment and  will
pay for all Shares that are validly tendered on or prior to the Expiration Date,
and  not properly withdrawn  in accordance with Section  4 below, promptly after
the Expiration Date.  All questions  as to the  satisfaction of  such terms  and
conditions  will  be  determined  by Purchaser  in  its  sole  discretion, which
determination will be final and binding. Subject to the applicable rules of  the
Commission,  Purchaser  expressly reserves  the  right to  delay  acceptance for
payment of or payment for Shares in order  to comply, in whole or in part,  with
any  other  applicable law  or government  regulation. Any  such delays  will be
effected in compliance with Rule 14e-1(c) under the Exchange Act (relating to  a
bidder's  obligation to pay for or return tendered securities promptly after the
termination or withdrawal of such bidder's offer). See Section 15 below.
 
    In all cases, payment for Shares accepted for payment pursuant to the  Offer
will  be made only  after timely receipt  by the Depositary  of (i) certificates
evidencing (or a timely Book-Entry Confirmation (as defined in Section 3  below)
with respect to) such Shares, (ii) a Letter of Transmittal (or a manually signed
facsimile),  properly completed  and duly  executed with  any required signature
guarantees, or, in  the case of  a book-entry transfer,  an Agent's Message  (as
defined  below),  and  (iii)  any  other documents  required  by  the  Letter of
Transmittal. See Section 3 below.
 
    The term  "Agent's Message"  means a  message, transmitted  by a  Book-Entry
Transfer  Facility (as  defined in  Section 3  below) to,  and received  by, the
Depositary and forming part of a Book-Entry Confirmation, which states that  (i)
such  Book-Entry Transfer Facility  has received an  express acknowledgment from
the participant in such Book-Entry Transfer Facility tendering Shares which  are
the  subject of such Book-Entry Confirmation, (ii) such participant has received
and agrees to  be bound by  the terms of  the Letter of  Transmittal, and  (iii)
Purchaser may enforce such agreement against such participant.
 
    For  purposes of the  Offer, Purchaser will  be deemed to  have accepted for
payment (and thereby purchased)  Shares properly tendered  to Purchaser and  not
withdrawn,  if and when Purchaser gives oral or written notice to the Depositary
of Purchaser's  acceptance of  such Shares.  In all  cases, payment  for  Shares
accepted  for  payment pursuant  to the  Offer will  be made  by deposit  of the
purchase price  therefor  with the  Depositary,  which  will act  as  agent  for
tendering  Shareholders for the purpose of  receiving payment from Purchaser and
transmitting payment to tendering Shareholders.
 
    If, for any reason, acceptance for  payment of any Shares tendered  pursuant
to  the Offer is  delayed, or Purchaser  is unable to  accept for payment Shares
tendered pursuant to the  Offer, then, without  prejudice to Purchaser's  rights
under the Offer (but subject to 14e-1(c) under the Exchange Act), the Depositary
may,  nevertheless, on  behalf of  Purchaser, retain  tendered Shares,  and such
Shares  may  not  be  withdrawn,  except  to  the  extent  that  the   tendering
Shareholders  are entitled to exercise, and  duly exercise, withdrawal rights as
described in Section 4  below. UNDER NO CIRCUMSTANCES  WILL INTEREST BE PAID  ON
THE  PURCHASE PRICE  OF THE SHARES  TO BE  PAID BY PURCHASER,  REGARDLESS OF ANY
EXTENSION OF THE OFFER OR ANY DELAY IN MAKING SUCH PAYMENT.
 
                                       4
<PAGE>
    If any  tendered Shares  are not  purchased pursuant  to the  Offer for  any
reason  or  if certificates  are submitted  for more  Shares than  are tendered,
certificates for Shares not purchased or  tendered will be returned pursuant  to
the  instructions of the tendering Shareholder  without expense to the tendering
Shareholder (or, in the case of Shares delivered by book-entry transfer into the
Depositary's  account  at  a  Book-Entry  Transfer  Facility  pursuant  to   the
procedures  set forth  in Section  3 below,  the Shares  will be  credited to an
account maintained at the appropriate Book-Entry Transfer Facility) as  promptly
as practicable following the expiration or termination of the Offer.
 
    If,  prior to the Expiration Date,  Purchaser increases the consideration to
be paid  per Share  pursuant to  the  Offer, Purchaser  will pay  the  increased
consideration  for all  Shares purchased pursuant  to the Offer,  whether or not
such Shares were tendered prior to the increase in consideration.
 
    Purchaser reserves the right to transfer or assign, in whole or from time to
time in part,  to Parent,  or to  one or  more direct  or indirect  wholly-owned
subsidiaries  of Parent, the  right to purchase Shares  tendered pursuant to the
Offer, but any  such transfer or  assignment will not  relieve Purchaser of  its
obligations under the Offer and will in no way prejudice the rights of tendering
Shareholders  to receive  payment for Shares  validly tendered  and accepted for
payment pursuant to the Offer.
 
3.  PROCEDURE FOR TENDERING SHARES
 
    VALID TENDERS.  For a Shareholder  validly to tender pursuant to the  Offer,
either  (i) a Letter  of Transmittal (or a  manually signed facsimile), properly
completed and duly  executed, together with  any required signature  guarantees,
or,  in the  case of a  book-entry transfer,  an Agent's Message,  and any other
required documents, must be received by  the Depositary at one of its  addresses
set  forth on the back  cover of this Offer to  Purchase prior to the Expiration
Date and  either (a)  certificates evidencing  Shares must  be received  by  the
Depositary  at any such address  prior to the Expiration  Date or (b) the Shares
must be delivered pursuant to the  procedures for book-entry transfer set  forth
below  and a Book-Entry Confirmation must be received by the Depositary prior to
the Expiration Date;  or (ii)  the tendering  Shareholder must  comply with  the
guaranteed  delivery procedures set forth  below. No alternative, conditional or
contingent tenders will be accepted.
 
    BOOK-ENTRY TRANSFER.  The Depositary will establish accounts with respect to
the Shares at The Depository Trust Company, the Midwest Securities Trust Company
and the  Philadelphia Depository  Trust Company  (each, a  "Book-Entry  Transfer
Facility"  and, collectively, the "Book-Entry Transfer Facilities") for purposes
of the Offer within two business days after the date of this Offer to  Purchase.
Any  financial  institution  that is  a  participant  in any  of  the Book-Entry
Transfer Facilities' systems may make book-entry delivery of Shares by causing a
Book-Entry Transfer Facility to transfer Shares into the Depositary's account at
the Book-Entry Transfer  Facility in  accordance with  that Book-Entry  Transfer
Facility's  procedures for such  transfer. However, although  delivery of Shares
may be effected through book-entry transfer  into the Depositary's account at  a
Book-Entry  Transfer Facility, the  Letter of Transmittal  (or a manually signed
facsimile), properly completed  and duly executed,  with any required  signature
guarantees,  or an Agent's  Message, and any other  required documents, must, in
any case, be  transmitted to,  and received  by, the  Depositary at  one of  its
addresses  set forth on  the back cover of  this Offer to  Purchase prior to the
Expiration Date, or the  tendering Shareholder must  comply with the  guaranteed
delivery  procedures described below. The  confirmation of a book-entry transfer
of Shares into  the Depositary's account  at a Book-Entry  Transfer Facility  as
described  above  is referred  to as  a  "Book-Entry Confirmation".  DELIVERY OF
DOCUMENTS TO A BOOK-ENTRY  TRANSFER FACILITY IN  ACCORDANCE WITH THE  BOOK-ENTRY
TRANSFER FACILITY'S PROCEDURES DOES NOT CONSTITUTE DELIVERY TO THE DEPOSITARY.
 
    THE METHOD OF DELIVERY OF CERTIFICATES FOR SHARES, THE LETTER OF TRANSMITTAL
AND ANY OTHER REQUIRED DOCUMENTS IS AT THE OPTION AND SOLE RISK OF THE TENDERING
SHAREHOLDER.  IF DELIVERY IS  MADE BY MAIL, REGISTERED  MAIL WITH RETURN RECEIPT
REQUESTED, PROPERLY  INSURED,  IS RECOMMENDED.  IN  ALL CASES,  SUFFICIENT  TIME
SHOULD BE ALLOWED TO ENSURE TIMELY DELIVERY.
 
    SIGNATURE  GUARANTEES.  No signature guarantee  is required on the Letter of
Transmittal (i)  if  the Letter  of  Transmittal  is signed  by  the  registered
holder(s) (which term, for purposes of this Section,
 
                                       5
<PAGE>
includes  any participant in any of  the Book-Entry Transfer Facilities' systems
whose name appears on a security position listing as the owner of the Shares) of
Shares tendered therewith and  such registered holder  has not completed  either
the  box entitled "Special  Delivery Instructions" or  the box entitled "Special
Payment Instructions" on the Letter of  Transmittal; or (ii) if such Shares  are
tendered  for the account of a  financial institution (including most commercial
banks,  savings  and  loans  associations  and  brokerage  houses)  that  is   a
participant  in the  Security Transfer  Agents Medallion  Program, the  New York
Stock Exchange  Medallion  Signature Guarantee  Program  or the  Stock  Exchange
Medallion   Program  (an  "Eligible  Institution").  In  all  other  cases,  all
signatures on  the Letter  of  Transmittal must  be  guaranteed by  an  Eligible
Institution. See Instruction 1 of the Letter of Transmittal. If the certificates
representing Shares are registered in the name of a person other than the signer
of  the Letter of  Transmittal or if payment  is to be  made or certificates for
Shares not tendered or not accepted for  payment are to be returned to a  person
other  than  the registered  holder of  the  certificates surrendered,  then the
tendered certificates representing  Shares must  be endorsed  or accompanied  by
appropriate  stock powers, in each  case signed exactly as  the name or names of
the registered holder or owners appear on the certificates, with the  signatures
on  the  certificates  or stock  powers  guaranteed  as described  above  and as
provided in the Letter of Transmittal. See Instructions 1 and 5 of the Letter of
Transmittal.
 
    GUARANTEED DELIVERY.  If a Shareholder desires to tender Shares pursuant  to
the  Offer and  such Shareholder's certificates  for Shares  are not immediately
available or the  procedure for  book-entry transfer  cannot be  completed on  a
timely  basis  or time  will  not permit  all  required documents  to  reach the
Depositary prior  to the  Expiration  Date, such  Shareholder's tender,  may  be
effected if all the following conditions are met:
 
           (i)
           such tender is made by or through an Eligible Institution;
 
          (ii)
           a properly completed and duly executed Notice of Guaranteed Delivery,
           substantially  in the form provided by  Purchaser, is received by the
    Depositary (as provided below) prior to the Expiration Date; and
 
         (iii)
           the certificates for all tendered Shares in proper form for  transfer
           (or  a  Book-Entry Confirmation  with  respect to  all  such tendered
    Shares) together  with a  properly  completed and  duly executed  Letter  of
    Transmittal  (or a  manually signed  facsimile) with  any required signature
    guarantees, or, in the  case of a book-entry  transfer, an Agent's  Message,
    and  any other documents are received by the Depositary within three trading
    days after the  date of execution  of the Notice  of Guaranteed Delivery.  A
    "trading  day"  is  any  day  on  which  NASDAQ  operated  by  the  National
    Association of Securities Dealers, Inc. (the "NASD") is open for business.
 
    The Notice of Guaranteed Delivery may be delivered by hand or transmitted by
telegram, facsimile transmission or mailed to the Depositary and must include  a
guarantee  by an  Eligible Institution in  the form  set forth in  the Notice of
Guaranteed Delivery.
 
    IN ALL CASES, SHARES SHALL NOT BE DEEMED VALIDLY TENDERED, UNLESS A PROPERLY
COMPLETED AND  DULY  EXECUTED  LETTER  OF  TRANSMITTAL  (OR  A  MANUALLY  SIGNED
FACSIMILE) IS RECEIVED BY THE DEPOSITARY.
 
    Notwithstanding  any other provision of this  Offer to Purchase, payment for
Shares accepted for payment pursuant to the Offer will in all cases be made only
after timely  receipt  by  the  Depositary of  certificates  for  (or  a  timely
Book-Entry  Confirmation with respect  to) such Shares,  a Letter of Transmittal
(or a manually signed facsimile), properly completed and duly executed, with any
required signature guarantees and any other documents required by the Letter  of
Transmittal (or in the case of a book-entry transfer, an Agent's Message).
 
    DETERMINATION  OF VALIDITY.  All  questions as to the  form of documents and
the validity, eligibility (including time of receipt) and acceptance for payment
of any tender of Shares pursuant to  any of the procedures described above  will
be  determined by Purchaser in its sole discretion, which determination shall be
final and  binding on  all parties.  Purchaser reserves  the absolute  right  to
reject  any or all tenders of Shares determined  not to be in proper form or the
acceptance of or payment for which  may, in the opinion of Purchaser's  counsel,
be   unlawful.   Purchaser   also   reserves  the   absolute   right   to  waive
 
                                       6
<PAGE>
any defect  or  irregularity in  any  tender of  any  Shares of  any  particular
Shareholder  whether or not similar defects  or irregularities are waived in the
case  of  other  Shareholders.  Purchaser's  interpretation  of  the  terms  and
conditions   of  the  Offer  (including  the   Letter  of  Transmittal  and  its
instructions) will be final and binding on all parties. No tender of Shares will
be deemed to have been validly  made, until all defects and irregularities  have
been  cured  or  waived. None  of  Purchaser,  Parent, the  Dealer  Manager, the
Depositary, the Information Agent or any other person will be under any duty  to
give  notification  of any  defects or  irregularities in  tenders or  incur any
liability for failure to give any such notification.
 
    BACKUP FEDERAL INCOME TAX WITHHOLDING.  To prevent backup federal income tax
withholding of 31%  of the  payments made to  Shareholders with  respect to  the
purchase  price  of Shares  purchased pursuant  to  the Offer  or the  Merger, a
Shareholder must  provide  the  Depositary  with his  or  her  correct  taxpayer
identification  number  and certify  that he  or  she is  not subject  to backup
federal income tax withholding by completing the substitute Form W-9 included in
the Letter of Transmittal. See Instruction 10 of the Letter of Transmittal.  See
Section 5 below.
 
    A  tender of Shares pursuant  to any of the  procedures described above will
constitute the tendering Shareholder's acceptance of the terms and conditions of
the Offer, as well as the tendering Shareholder's representation and warranty to
Purchaser that (i) the Shareholder has a  net long position in the Shares  being
tendered,  within the meaning of Rule 14e-4 under the Exchange Act, and (ii) the
tender of Shares complies with Rule 14e-4. It is a violation of Rule 14e-4 for a
person, directly or indirectly, to tender Shares for his own account, unless, at
the time of tender, the person so tendering (i) has a net long position equal to
or greater  than the  amount of  (a)  Shares tendered  or (b)  other  securities
immediately  convertible into or exchangeable or exercisable for Shares tendered
and that person will  acquire the Shares for  tender by conversion, exchange  or
exercise and (ii) will cause Shares to be delivered in accordance with the terms
of the Offer. Rule 14e-4 provides a similar restriction applicable to the tender
or guarantee of a tender on behalf of another person. Purchaser's acceptance for
payment  of  Shares tendered  pursuant to  the Offer  will constitute  a binding
agreement between the  tendering Shareholder  and Purchaser upon  the terms  and
conditions of the Offer.
 
    APPOINTMENT  AS PROXY.   By executing  a Letter of  Transmittal, a tendering
Shareholder irrevocably appoints designees of Purchaser as his attorneys-in-fact
and proxies, with full  power of substitution,  in the manner  set forth in  the
Letter  of  Transmittal, to  the full  extent of  the Shareholder's  rights with
respect to Shares  tendered by the  Shareholder and purchased  by Purchaser  and
with  respect to any and all other Shares or other securities issued or issuable
in respect of those Shares, on or after  the date of the Offer. All such  powers
of  attorney and  proxies will  be considered  coupled with  an interest  in the
tendered Shares. Such appointment will be effective when, and only to the extent
that, Purchaser accepts such purchased  Shares for payment. Upon acceptance  for
payment,  all prior powers of attorney and proxies given by the Shareholder with
respect to the Shares  (and any other  Shares or other  securities so issued  in
respect  of such purchased Shares) will  be revoked, without further action, and
no subsequent powers of attorney and proxies  may be given (and, if given,  will
not  be deemed effective) by the Shareholder. The designees of Purchaser will be
empowered to  exercise all  voting  and other  rights  of the  Shareholder  with
respect  to such Shares (and any other Shares or securities so issued in respect
of such purchased  Shares) as  they in their  sole discretion  may deem  proper,
including,  without limitation, in  respect of any annual  or special meeting of
the Shareholders, or any adjournment or postponement of any such meeting, or  in
connection  with any action  by written consent  in lieu of  any such meeting or
otherwise (including any such  meeting or action by  written consent to  approve
the Merger). Purchaser reserves the absolute right to require that, in order for
Shares  to  be validly  tendered,  immediately upon  Purchaser's  acceptance for
payment of the Shares, Purchaser must be able to exercise full voting and  other
rights  with  respect  to  the  Shares,  including  voting  at  any  meeting  of
Shareholders then scheduled.
 
4.  WITHDRAWAL RIGHTS
 
    Tenders of Shares  made pursuant  to the  Offer are  irrevocable, except  as
otherwise  provided in this Section 4. Shares tendered pursuant to the Offer may
be withdrawn pursuant to the procedures set forth below at any time prior to the
Expiration Date and,  unless theretofore accepted  for payment and  paid for  by
Purchaser  pursuant to the Offer,  may also be withdrawn  at any time after June
15,
 
                                       7
<PAGE>
1996. If Purchaser extends the Offer, is  delayed in its purchase of or  payment
for  Shares or  is unable  to purchase or  pay for  Shares for  any reason then,
without prejudice to the rights of Purchaser, tendered Shares may be retained by
the Depositary on behalf of  Purchaser and may not  be withdrawn, except to  the
extent  that tendering  Shareholders are  entitled to  withdrawal rights  as set
forth in this Section 4. The reservation by Purchaser of the right to delay  the
acceptance  or purchase of or payment for Shares is subject to the provisions of
Rule 14e-1(c)  under the  Exchange  Act, which  requires  Purchaser to  pay  the
consideration  offered  or  return  the  Shares deposited  by  or  on  behalf of
Shareholders promptly after the termination or withdrawal of the Offer.
 
    For a  withdrawal  to be  effective,  a written,  telegraphic  or  facsimile
transmission  notice of withdrawal must be  timely received by the Depositary at
one of its addresses set forth on the back cover of this Offer to Purchase.  Any
such  notice of withdrawal must specify the name of the persons who tendered the
Shares to be withdrawn, the number of Shares to be withdrawn and the name of the
registered holder, if different from that of the person who tendered the Shares.
If certificates evidencing Shares have been delivered or otherwise identified to
the Depositary, then, prior  to the physical release  of such certificates,  the
tendering  Shareholder must  also submit  to the  Depositary the  serial numbers
shown on the particular certificates evidencing the Shares to be withdrawn,  and
the  signature on  the notice  of withdrawal must  be guaranteed  by an Eligible
Institution (except  in  the case  of  Shares tendered  for  the account  of  an
Eligible  Institution). If Shares  have been tendered  pursuant to the procedure
for book-entry transfer set forth in  Section 3 above, the notice of  withdrawal
must  also  specify  the  name  and number  of  the  account  at  the applicable
Book-Entry Transfer  Facility  to be  credited  with the  withdrawn  Shares  and
otherwise comply with such Book-Entry Transfer Facility's procedures.
 
    All  questions as to  the form and  validity (including time  of receipt) of
notices of withdrawal will be determined  by Purchaser, in its sole  discretion,
whose  determination will be final and binding  on all parties. No withdrawal of
Shares will  be  deemed  to  have  been properly  made  until  all  defects  and
irregularities  have been cured or waived. None of Parent, Purchaser, the Dealer
Manager, the Depositary, the Information Agent or any other person will be under
any duty to give notification of any defects or irregularities in any notice  of
withdrawal or incur any liability for failing to give such notification.
 
    Any  Shares  properly  withdrawn will  be  deemed not  validly  tendered for
purposes of the Offer, but may be  tendered at any subsequent time prior to  the
Expiration Date by following any of the procedures described in Section 3 above.
 
                                       8
<PAGE>
5.  CERTAIN FEDERAL INCOME TAX CONSEQUENCES OF THE OFFER AND THE MERGER
 
    The  following is a summary of the principal federal income tax consequences
of the Offer and the  Merger to holders whose  Shares are purchased pursuant  to
the  Offer or whose  Shares are converted  into the right  to receive the Merger
Consideration in the Merger (including  any cash amounts received by  dissenting
Shareholders  pursuant to the exercise of  appraisal rights). This discussion is
based upon the provisions of the Internal Revenue Code of 1986, as amended  (the
"Code"),   the   applicable  Treasury   Regulations  promulgated   and  proposed
thereunder,  judicial  authority  and   administrative  rulings  and   practice.
Legislative,  judicial or administrative changes  or interpretations are subject
to change, possibly  on a  retroactive basis, at  any time  and therefore  could
alter  or modify the statements  and conclusions set forth  below. It is assumed
that the Shares are held as "capital assets" within the meaning of Section  1221
of  the  Code (I.E.,  property held  for investment).  This discussion  does not
address all  aspects  of federal  income  taxation that  may  be relevant  to  a
particular  Shareholder  in  light  of  such  Shareholder's  personal investment
circumstances, or  those Shareholders  subject to  special treatment  under  the
federal  income  tax laws  (for  example, life  insurance  companies, tax-exempt
organizations, foreign  corporations and  nonresident alien  individuals) or  to
Shareholders  who acquired their  Shares through the  exercise of employee stock
options or other compensation arrangements. In addition, the discussion does not
address any aspect of foreign, state, local or estate and gift taxation that may
be applicable to a Shareholder.
 
    CONSEQUENCES OF THE OFFER  AND THE MERGER TO  SHAREHOLDERS.  The receipt  of
the  Offer  Price  and  the Merger  Consideration  (including  any  cash amounts
received by  dissenting  Shareholders  pursuant to  the  exercise  of  appraisal
rights)  will be a taxable transaction for federal income tax purposes (and also
may be a taxable transaction under applicable state, local and other income  tax
laws). In general, for federal income tax purposes, a Shareholder will recognize
gain  or loss equal to  the difference between his or  her adjusted tax basis in
the Shares sold pursuant to the Offer or converted to cash in the Merger and the
amount of cash received therefor. Gain or loss must be determined separately for
each block  of Shares  (I.E.,  Shares acquired  at the  same  cost in  a  single
transaction) sold pursuant to the Offer or converted to cash in the Merger. Such
gain  or loss will be capital  gain or loss and will  be long-term gain or loss,
if, on the date of sale (or, if applicable, the date of the Merger), the  Shares
were held for more than one year.
 
    BACKUP TAX WITHHOLDING.  Under the Code, a Shareholder may be subject, under
certain  circumstances, to  "backup withholding" at  a 31% rate  with respect to
payments made in  connection with the  Offer or the  Merger. Backup  withholding
generally  applies if  the Shareholder  (i) fails to  furnish his  or her social
security number or other taxpayer identification number ("TIN"), (ii)  furnishes
an  incorrect TIN, (iii) fails properly to  report interest or dividends or (iv)
under certain  circumstances, fails  to provide  a certified  statement,  signed
under  penalties of perjury, that the TIN  provided is his or her correct number
and that he or she is not  subject to backup withholding. Backup withholding  is
not  an additional tax but  merely an advance payment,  which may be refunded to
the extent it results  in an overpayment of  tax. Certain persons generally  are
exempt   from   backup   withholding,  including   corporations   and  financial
institutions. Certain penalties apply for failure to furnish correct information
and for failure to include the  reportable payments in income. Each  Shareholder
should  consult with his or her own tax  advisor as to his or her qualifications
for exemption from withholding and the procedure for obtaining such exemption.
 
    THE FEDERAL INCOME TAX  DISCUSSION SET FORTH ABOVE  IS INCLUDED FOR  GENERAL
INFORMATION PURPOSES ONLY. SHAREHOLDERS SHOULD CONSULT THEIR OWN TAX ADVISORS TO
DETERMINE  THE FEDERAL, STATE,  LOCAL AND FOREIGN TAX  CONSEQUENCES OF THE OFFER
AND THE MERGER TO THEM IN VIEW OF THEIR OWN PARTICULAR CIRCUMSTANCES.
 
6.  PRICE RANGE OF THE SHARES; DIVIDENDS ON THE SHARES
 
    According to the Company's  Annual Report on Form  10-K for the fiscal  year
ended June 30, 1995 (the "Company's 10-K"), the principal trading market for the
Shares is The NASDAQ Small-Cap
 
                                       9
<PAGE>
Market,  where, prior to March 21, 1996,  the trading symbol was CVTA. Effective
March 21,  1996,  the  Company's  listing  has  been  made  conditional  pending
implementation  of its plan to satisfy  minimum capital and surplus requirements
of NASDAQ. The conditional  listing status is indicated  by an additional  fifth
letter  "C" appended to  the Company's trading  symbol. Accordingly, since March
21, 1996, the trading  symbol for the Company's  Shares is CVTAC. The  following
table sets forth, for each fiscal quarter from October 24, 1994, the date of the
Company's  initial  public offering,  the  high and  low  sale prices  per Share
reported on The NASDAQ Small-Cap Market.
 
<TABLE>
<CAPTION>
                                                                                                       HIGH        LOW
                                                                                                     ---------  ---------
<S>                                                                                                  <C>        <C>
1995:
  Second Quarter (from October 24, 1994)...........................................................      5 1/4      3 1/4
  Third Quarter....................................................................................          6      3 3/4
  Fourth Quarter...................................................................................      5 1/4      3 7/8
1996:
  First Quarter....................................................................................      7 3/4      4 3/4
  Second Quarter...................................................................................     10 1/2      6 3/4
  Third Quarter....................................................................................     10 3/4      7 3/4
  Fourth Quarter (through April 16)................................................................     10 1/8      8 3/4
</TABLE>
 
    On April 10, 1996, the last full trading day before the public  announcement
by  Parent  and  the  Company  of the  execution  of  the  Merger  Agreement and
Purchaser's intention to commence the Offer, the last reported sale price on The
NASDAQ Small-Cap Market was $8 7/8 per  Share. On April 16, 1996, the last  full
trading  day before the commencement of the  Offer, the last reported sale price
on The NASDAQ Small-Cap Market was $10 1/16 per Share. SHAREHOLDERS ARE URGED TO
OBTAIN CURRENT MARKET QUOTATIONS FOR THE SHARES.
 
    According to  published financial  sources,  the Company  has not  paid  any
dividends on the Shares for the periods presented above.
 
7.  EFFECT OF THE OFFER ON THE MARKET FOR THE SHARES, STOCK QUOTATION AND
    EXCHANGE ACT REGISTRATION AND MARGIN SECURITIES
 
    The  purchase of  Shares pursuant  to the  Offer will  reduce the  number of
Shares that might otherwise trade publicly and may reduce the number of  holders
of  Shares, which could adversely  affect the liquidity and  market value of the
remaining Shares held  by Shareholders  other than  Purchaser. Purchaser  cannot
predict whether the reduction in the number of Shares that might otherwise trade
publicly  would have an adverse or beneficial effect on the market price for, or
marketability of, the Shares or whether such reduction would cause future market
prices to be greater or less than the Offer Price.
 
    The extent  of  the public  market  for the  Shares  and, according  to  the
published  guidelines of the NASD, the availability of quotations for the Shares
through The  NASDAQ Small-Cap  Market,  after commencement  of the  Offer,  will
depend upon the number of holders of Shares remaining at such time, the interest
in  maintaining a  market in such  Shares on  the part of  securities firms, the
possible termination of registration of such  Shares under the Exchange Act,  as
described below, and other factors.
 
    The  Shares are currently registered under the Exchange Act. Registration of
the Shares under  the Exchange  Act may be  terminated upon  application of  the
Company  to  the Commission  if  the Shares  are  neither listed  on  a national
securities exchange nor held  by 300 or more  holders of record. Termination  of
the registration of the Shares under the Exchange Act would substantially reduce
the information required to be furnished by the Company to holders of Shares and
to  the Commission and would make certain  of the provisions of the Exchange Act
no longer applicable  to the  Company. Such provisions  include the  short-swing
profit  recovery provisions  of Section 16(b),  the requirement  of furnishing a
proxy statement pursuant  to Section  14(a) in connection  with a  shareholder's
meeting   and  the  related  requirement  of   providing  an  annual  report  to
shareholders and the requirements of
 
                                       10
<PAGE>
Rule 13e-3 under the Exchange Act with respect to "going private"  transactions.
Furthermore,  "affiliates"  of  the  Company  and  persons  holding  "restricted
securities" of the Company  may be deprived  of the ability  to dispose of  such
securities pursuant to Rule 144 as promulgated under the Securities Act of 1933,
as  amended (the "Securities Act"). If registration of Shares under the Exchange
Act were terminated, Shares would no  longer be "margin securities" or  eligible
for  listing or NASDAQ reporting. Purchaser intends to seek to cause the Company
to terminate registration  of the Shares  under the Exchange  Act as soon  after
consummation of the Offer as the requirements for termination of registration of
Shares are met.
 
    The  Shares are currently  "margin securities" under  the regulations of the
Board of Governors of the Federal Reserve System (the "Federal Reserve  Board"),
which  has the effect, among other things,  of allowing brokers to extend credit
on the  collateral of  such  Shares. Depending  upon  factors similar  to  those
described  above regarding  listing and market  quotations, the  Shares might no
longer constitute "margin securities"  for the purposes  of the Federal  Reserve
Board's margin regulations and, therefore, could no longer be used as collateral
for loans made by brokers.
 
8.  CERTAIN INFORMATION CONCERNING THE COMPANY
 
    The  Company is a  Florida corporation with  its principal executive offices
located at  8210  N.W. 27th  Street,  Miami,  Florida 33122.  According  to  the
Company's   10-K,  the  Company  designs,  develops,  manufactures  and  markets
artificial arteries, also  known as endoluminal  grafts (combinations of  stents
and  grafts) and  synthetic vascular  grafts, which  reline, replace,  repair or
bypass occluded, damaged, dilated or severely diseased arteries. Currently,  the
Company  markets its products primarily in  Europe and Latin America. Commercial
sales of the grafts cannot  begin in the United States  until the U.S. Food  and
Drug Administration has granted the Company regulatory approval for such sales.
 
                                       11
<PAGE>
    Set  forth below is certain selected consolidated financial information with
respect to the Company and its  subsidiaries, excerpted from the Company's  10-K
and  the Company's Quarterly  Report on Form  10-Q for the  fiscal quarter ended
December 31, 1995. More comprehensive financial information is included in  such
reports  and other documents filed  by the Company with  the Commission, and the
following summary is qualified in its entirety by reference to such reports  and
other  documents and all the financial information (including any related notes)
contained therein. Such reports and other documents are available for inspection
and copies  are  obtainable in  the  manner  set forth  below  under  "Available
Information".
 
                      SELECTED CONSOLIDATED FINANCIAL DATA
                (THOUSANDS OF DOLLARS, EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                                   FISCAL YEAR ENDED JUNE 30,
                                                                                 -------------------------------
                                                                                   1995       1994       1993
                                                                    SIX MONTHS   ---------  ---------  ---------
                                                                      ENDED
                                                                   DECEMBER 31,
                                                                       1995
                                                                   ------------
                                                                   (UNAUDITED)
<S>                                                                <C>           <C>        <C>        <C>
STATEMENT OF OPERATIONS DATA:
  Revenues.......................................................   $      401   $   1,207  $   1,034  $     442
  Cost of sales and manufacturing overhead.......................        1,100       2,005      1,680      1,096
  Selling, general and administrative expenses...................        1,558       2,399      2,098      1,484
  Total operating expenses.......................................        5,712       5,519      5,103      4,487
  Interest income (expense), net.................................           49         169         52        130
  Total other income (expense)...................................          245         223       (435)       250
  Net loss.......................................................       (6,166)     (6,094)    (6,184)    (4,891)
  Net loss per common share......................................        (0.87)      (1.19)        --         --
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                                 AT JUNE 30,
                                                                                             --------------------
                                                                                               1995       1994
                                                                               AT DECEMBER   ---------  ---------
                                                                                 31, 1995
                                                                               ------------
                                                                               (UNAUDITED)
<S>                                                                            <C>           <C>        <C>
BALANCE SHEET DATA:
  Total current assets.......................................................   $    2,572   $   6,503  $   2,397
  Total assets...............................................................        4,368       8,162      4,149
  Total current liabilities..................................................        3,720       1,456      3,095
  Long-term notes payable -- Net of current portion..........................          834         785        917
  Total stockholders' equity (deficit).......................................         (186)      5,921    (18,968)
</TABLE>
 
- ------------------------
Information  relating  to  the  Company's  net loss  per  common  share  was not
disclosed for the fiscal years ended June 30, 1993 and June 30, 1994.
 
    AVAILABLE INFORMATION.  The Company  is subject to the informational  filing
requirements  of  the Exchange  Act. In  accordance with  the Exchange  Act, the
Company files periodic reports, proxy statements and other information with  the
Commission  relating to its business, financial condition and other matters. The
Company is required to disclose in such proxy statements certain information, as
of particular  dates, concerning  the Company's  directors and  officers,  their
remuneration,  stock  options  granted to  them,  the principal  holders  of the
Company's securities and any material interest of those persons in  transactions
with  the Company. Such  reports, proxy statements and  other information may be
inspected at the Commission's office at 450 Fifth Street, N.W., Washington, D.C.
20549, and also are available for inspection and copying at the regional offices
of the  Commission  located at  Northwestern  Atrium Center,  500  West  Madison
Street, Suite 1400, Chicago, Illinois 60661-2511; and 7 World Trade Center, 13th
Floor,  New York,  New York 10048.  Copies may  be obtained upon  payment of the
Commission's prescribed fees  by writing to  its principal office  at 450  Fifth
Street,  N.W., Washington, D.C. 20549. Such material can also be obtained at the
office of The National Association of  Securities Dealers, Inc., 1735 K  Street,
N.W., Washington, D.C. 20006-1506.
 
                                       12
<PAGE>
    Except  as  otherwise  stated in  this  Offer to  Purchase,  the information
concerning the Company contained in this  Offer to Purchase has been taken  from
or based upon publicly available documents on file with the Commission and other
publicly  available information. Although  Purchaser and Parent  do not have any
knowledge that  any such  information is  untrue, neither  Purchaser nor  Parent
takes any responsibility for the accuracy or completeness of such information or
for any failure by the Company to disclose events that may have occurred and may
affect the significance or accuracy of any such information.
 
9.  CERTAIN INFORMATION CONCERNING PURCHASER AND PARENT
 
    Purchaser,   a  Florida  corporation,  was  organized  to  acquire  all  the
outstanding Shares pursuant to  the Offer and the  Merger and has not  conducted
any  unrelated activities  since its  organization. All  the outstanding capital
stock of Purchaser is owned directly by Parent. The principal executive  offices
of Purchaser are located at 235 East 42nd St., New York, New York 10017-5755.
 
    Parent,  a  Delaware corporation,  is  an innovative,  research-based global
health  care  company.  Parent  discovers,  develops,  manufactures  and   sells
technology-intensive  products in  three business  segments: Health  Care, which
includes a  broad range  of prescription  pharmaceuticals, orthopedic  implants,
medical  devices and  surgical equipment;  Animal Health,  which includes animal
health products and feed supplements; and Consumer Health Care, which includes a
variety of  nonprescription  drugs and  personal  care products.  The  principal
executive  offices of  Parent are  located at  235 East  42nd St.,  New York, NY
10017-5755. The shares of Parent  are publicly held and  listed on the New  York
Stock Exchange.
 
    The name, business address, present principal occupation or employment, five
year  employment history and citizenship of  each director and executive officer
of Purchaser and Parent are set forth in Schedule I.
 
    Set forth below is certain selected consolidated financial data with respect
to Parent and  its subsidiaries excerpted  from Parent's Annual  Report on  Form
10-K  for  the  year  ended  December  31, 1995  as  filed  by  Parent  with the
Commission. More comprehensive financial information is included in such  report
and  other  documents filed  by the  Parent with  the Commission.  The following
summary is  qualified in  its entirety  by reference  to such  report and  other
documents  and all financial information (including any related notes) contained
therein. Such report and other documents are available for inspection and copies
are obtainable  in the  manner set  forth in  Section 8  above with  respect  to
information about the Company in Section 8.
 
                                       13
<PAGE>
                      SELECTED CONSOLIDATED FINANCIAL DATA
                (MILLIONS OF DOLLARS, EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                                   YEAR ENDED DECEMBER 31,
                                                                             -----------------------------------
                                                                                1995         1994        1993
                                                                             -----------  ----------  ----------
<S>                                                                          <C>          <C>         <C>
STATEMENT OF INCOME DATA:
  Net sales................................................................  $  10,021.4  $  7,977.3  $  7,161.8
  Cost of sales............................................................      2,164.1     1,722.2     1,559.0
  Selling, informational and administrative expenses.......................      3,854.7     3,184.1     3,005.7
  Research and development expenses........................................      1,442.4     1,126.1       961.3
  Income from continuing operations before provision for taxes on income
   and minority interests..................................................      2,299.2     1,830.5       835.3
  Net income...............................................................      1,572.9     1,298.4       657.5
  Net income per common share..............................................         2.50        2.09        1.03
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                             AT DECEMBER 31,
                                                                                         ------------------------
                                                                                            1995         1994
                                                                                         -----------  -----------
<S>                                                                                      <C>          <C>
BALANCE SHEET DATA:
  Total current assets.................................................................  $   6,152.4  $   5,788.4
  Total assets.........................................................................     12,729.3     11,098.5
  Total current liabilities............................................................      5,187.2      4,825.9
  Total liabilities....................................................................      7,222.7      6,774.6
  Total shareholders' equity...........................................................      5,506.6      4,323.9
</TABLE>
 
    Except as described in this Offer to Purchase, (i) none of Parent, Purchaser
or,  to the best knowledge of Purchaser and Parent, any of the persons listed in
Schedule I or  any associate or  majority-owned subsidiary of  any such  person,
beneficially  owns or has a right to  acquire any equity security of the Company
and (ii) none  of Parent, Purchaser,  or, to  the best knowledge  of Parent  and
Purchaser,  any of the other persons referred to above, or any of the respective
directors, executive  officers or  subsidiaries  of any  of the  foregoing,  has
effected  any transaction in any equity security  of the Company during the past
60 days.
 
    Except as  described  in  this  Offer  to  Purchase,  (i)  none  of  Parent,
Purchaser, or, to the best knowledge of Parent and Purchaser, any of the persons
listed   in  Schedule  I   has  any  contract,   arrangement,  understanding  or
relationship (whether or  not legally  enforceable) with any  other person  with
respect  to any securities  of the Company,  including, but not  limited to, any
contract, arrangement, understanding or relationship concerning the transfer  or
the  voting of any such securities, joint ventures, loan or option arrangements,
puts or calls,  guarantees of loans,  guarantees against loss  or the giving  or
withholding  of proxies  and (ii) there  have been no  contacts, negotiations or
transactions  between  Parent   and  Purchaser  or   any  of  their   respective
subsidiaries  or, to the  best knowledge of  Parent and Purchaser  or any of the
persons listed in Schedule  I, on the one  hand, and the Company  or any of  its
directors,  officers or affiliates, on  the other hand, that  are required to be
disclosed pursuant to the rules and regulations of the Commission.
 
    Except as described in this Offer  to Purchase, during the last five  years,
none of Purchaser, Parent or, to the best knowledge of Purchaser and Parent, any
of  the  persons listed  in  Schedule I  (i) has  been  convicted in  a criminal
proceeding (excluding traffic violations and similar misdemeanors) or (ii) was a
party to a civil  proceeding of a judicial  or administrative body of  competent
jurisdiction and as a result of such proceeding was or is subject to a judgment,
decree  or final order enjoining future violations of, or prohibiting activities
subject to, Federal or  state securities laws or  finding any violation of  such
laws.
 
10.  SOURCE AND AMOUNT OF FUNDS
 
    The  Offer  is not  conditioned upon  any financing  arrangements. Purchaser
estimates that the total  amount of funds required  to consummate the Offer  and
the Merger, to pay related fees and
 
                                       14
<PAGE>
expenses and to pay outstanding indebtedness of the Company which may become due
as  a result of the Offer and the Merger is approximately $85 million. Purchaser
expects to obtain these funds in the form of capital contributions and/or  loans
from  Parent.  Parent expects  to fund  the  capital contributions  and/or loans
provided to Purchaser from existing available working capital.
 
11.  BACKGROUND OF THE OFFER
 
    Since 1993,  Parent  and the  Company  have from  time  to time  engaged  in
discussions  and have conducted studies  together regarding the applicability of
the Company's  proprietary  biomaterials  for use  in  Parent's  medical  device
products. In addition, Howmedica, Inc., a wholly-owned subsidiary of Parent, has
from time to time purchased the Company's biomaterials for evaluation.
 
    In  early 1993, the Company and  Parent engaged in discussions and conducted
feasibility studies regarding the possibile joint development of medical  device
products. On June 29, 1993, a representative of Parent raised the possibility of
Parent's  acquiring an equity interest in the  Company in exchange for rights to
the Company's  proprietary  technology. Following  the  June 29,  1993  meeting,
representatives  of the Company and Parent  further discussed the possibility of
an equity investment in the Company by Parent in several telephone calls.  These
discussions were terminated in 1993.
 
    In  May of 1995, a  representative of Parent contacted  a shareholder of the
Company regarding the possible  acquisition by Parent of  an equity interest  in
the Company. Parent's representative was told that the Company was considering a
number  of strategic alternatives, including a  possible sale of the Company and
that Parent  should express  its possible  interest to  Mr. Howard  Wachtler,  a
director of the Company.
 
    In  June  of 1995,  a representative  of Parent  and Mr.  Wachtler discussed
Parent's possible interest in exploring an acquisition by Parent of the Company.
 
    In mid July of 1995, Parent was contacted by representatives of Dillon Read,
financial advisor to the Company, to  further explore a possible acquisition  of
the  Company. On July 18,  1995, Dillon Read delivered  to Parent an information
packet describing the Company.
 
    On August 16, 1995,  Parent and the Company  entered into a  confidentiality
and  standstill agreement  for the  purpose of  receiving non-public information
with respect to  the Company.  Parent subsequently  received certain  non-public
information  concerning the  Company and began  its due diligence  review of the
Company. Subsequent due diligence  meetings were held during  the Fall of  1995,
including interviews with certain of the Company's technical personnel.
 
    On  October 4, 1995, a representative of Dillon Read and a representative of
Parent had a telephone conversation in  which the parties explored each  others'
positions with respect to a possible price for a transaction.
 
    In  mid October  of 1995,  a representative  of Dillon  Read indicated  to a
representative of Lazard Freres, financial advisor to Parent, that the Company's
Board of Directors would like to receive from Parent for its consideration at  a
meeting  of the Company's Board of Directors a written expression of interest in
acquiring the Company.  Parent subsequently  delivered a letter  to the  Company
indicating  that Parent would  consider acquiring all  of the outstanding common
stock of the Company for approximately  $10 per Share provided that the  Company
negotiate exclusively with Parent.
 
    On  October  17,  1995,  a  representative of  Dillon  Read  indicated  to a
representative of Lazard Freres in a telephone call that the Company's Board  of
Directors  had determined in their meeting held that day to continue discussions
with Parent but on a non-exclusive basis. The Lazard Freres representative asked
whether there was  an acquisition  price at  which the  Company would  negotiate
exclusively  with  Parent. In  a  subsequent telephone  call  later that  day, a
representative of Dillon Read indicated to the Lazard Freres representative that
the Company would  be prepared to  negotiate exclusively with  Parent if  Parent
were prepared to offer $12 per Share.
 
                                       15
<PAGE>
    On  October  18,  1995, Parent  sent  to  Dillon Read  a  non-binding letter
indicating Parent's interest  in entering  into discussions  on a  non-exclusive
basis  to  acquire  all of  the  outstanding  common stock  of  the  Company for
approximately $10  per  Share,  subject  to, among  other  things,  approval  by
Parent's  Board of Directors  and negotiation of  a mutually satisfactory merger
agreement containing customary conditions.
 
    Parent continued its due diligence review throughout the Fall of 1995. Based
on its due diligence, Parent's representatives indicated to the Company that  it
was  a condition to Parent's  willingness to enter into  an agreement to acquire
the Company that a license agreement between the Company and a Japanese licensee
be terminated.
 
    In early December of  1995, Parent's legal  counsel furnished the  Company's
legal  counsel with a draft of each of the merger agreement and the shareholders
agreement.
 
    During December of 1995, representatives of Parent, Lazard Freres, and Weil,
Gotshal & Manges LLP,  Parent's legal counsel, met  with representatives of  the
Company,  Dillon  Read and  Epstein, Becker  & Green  P.C., the  Company's legal
counsel, to  negotiate  the  terms  of a  definitive  merger  agreement.  Parent
indicated  to the  Company that  it was a  condition to  Parent's willingness to
enter into  an agreement  to acquire  the Company  that the  Company enter  into
certain license arrangements relating to the Company's patent rights in Belgium,
and  the Company acquire all  of the shares of  its Canadian subsidiary not then
owned by the Company.
 
    In early December of 1995, Mr. Wachtler and a representative of Dillon  Read
met with Mr. P. Nigel Gray, President of Parent's Hospital Products Group, and a
representative  of  Lazard  Freres to  discuss  the status  of  the negotiations
including the range of prices at  which Parent might make an acquisition  offer.
During  this meeting, the  Company's representatives indicated  that the Company
was interested in  receiving $11 per  Share. Parent's representatives  indicated
that  Parent was considering an  offer of approximately $10  per Share but would
consider increasing the  aggregate consideration by  up to $4  million less  the
cost  to  the  Company of  satisfying  certain  conditions to  be  met  prior to
executing a merger agreement.
 
    On January  18,  1996,  the Company  issued  a  press release  in  which  it
announced  that it was involved in discussions for its acquisition at a price in
the range of approximately $10 per Share.
 
    In late January and February 1996, representatives of Parent and the Company
met to  discuss the  Company's  supply agreements  and  the possibility  of  the
Company   finding  potential   third  party   manufacturers  of   the  Company's
polycarbonate urethane material.
 
    During this  same  period,  Parent's financial  advisor  continued  to  hold
discussions  with the Company's financial advisor regarding, among other things,
the merger consideration. In a telephone conversation in February 1996, Parent's
and the  Company's  respective  financial advisors  discussed  the  transaction.
Parent's  financial advisor  indicated that, assuming  the parties  were able to
resolve open points and the conditions established by Parent were satisfied, and
subject to Parent receiving  current information with  respect to the  Company's
cash  balances and payables, Parent would likely  consider an offer in the range
of $10.25 to $10.50 per Share.
 
    In March  and early  April, Parent  and the  Company continued  negotiations
which  culminated in the Company  and Parent agreeing upon  a form of definitive
merger agreement and  certain shareholders and  Parent agreeing upon  a form  of
definitive  Shareholders Agreement.  During this period,  the representatives of
the Company and Parent also discussed the Company's need to obtain financing  in
order to continue operations in the ordinary course of business.
 
    On March 28, 1996, Parent's Board of Directors approved the Merger Agreement
and   the  transactions   contemplated  therein  subject   to  the  satisfactory
negotiation of the remaining open points.
 
                                       16
<PAGE>
    On Thursday, April 4, 1996, a  representative of Lazard Freres telephoned  a
representative of Dillon Read to indicate that Parent was prepared to pay $10.25
per  Share.  The Merger  Agreement was  then  presented to  and approved  by the
Company's Board of Directors at a meeting held on Friday, April 5, 1996.
 
    From April 5 through to April 11, representatives of each of the Company and
Parent and  their  respective legal  counsel  negotiated  the terms  of  a  loan
agreement  in an  amount of  $2,000,000 from  Parent to  the Company  (the "Loan
Agreement"). In connection with the Loan Agreement, the Company and Parent  also
negotiated the terms of a non-exclusive license (the "Non-Exclusive License") to
Parent with respect to the Company's proprietary intellectual property.
 
    On  the morning  of April 11,  1996, the Merger  Agreement, the Shareholders
Agreement, the Loan Agreement and  the Non-Exclusive License were executed,  and
the transaction was publicly announced.
 
12.  PURPOSE OF THE OFFER AND THE MERGER; PLANS FOR THE COMPANY; THE MERGER
     AGREEMENT; THE SHAREHOLDERS AGREEMENT
 
    PURPOSE OF THE OFFER AND THE MERGER
 
    The  purpose of the Offer and the  Merger is to enable Purchaser to acquire,
in one  or more  transactions, control  of  the Company  and the  entire  equity
interest  in the Company. The Offer is  intended to increase the likelihood that
the Merger  will be  completed promptly.  Pursuant to  the terms  of the  Merger
Agreement,  if the Offer is successful, each Share not purchased pursuant to the
Offer excluding Shares  owned, directly  or indirectly,  by the  Company or  any
subsidiary  of  the Company  and  Shares owned  by  shareholders who  shall have
properly exercised their appraised rights  under Florida law, will be  converted
into  the  right to  receive an  amount equal  to  the price  per share  paid by
Purchaser pursuant to the Offer, less any required withholding of taxes.
 
    PLANS FOR THE COMPANY
 
    Parent intends to utilize the Company's proprietary technology to complement
its development of new stent  products. Additionally, Parent intends, from  time
to  time after  completion of  the Offer, to  evaluate and  review the Company's
operations and consider  what, if any,  changes would be  desirable in light  of
circumstances that then exist.
 
    Except  as noted  in this  Offer to Purchase,  Purchaser and  Parent have no
present plans  or proposals  that  would result  in an  extraordinary  corporate
transaction,  such as a merger, reorganization,  liquidation or sale or transfer
of a material amount of assets, involving  the Company or any subsidiary or  any
other  material  changes  in  the  Company's  capitalization,  dividend  policy,
corporate structure, business or composition of its management or Board.
 
THE MERGER AGREEMENT
 
    The following is a  summary of the material  terms of the Merger  Agreement.
This  summary is not a  complete description of the  terms and conditions of the
Merger Agreement and is qualified in its entirety by reference to the full  text
of  the Merger Agreement, which is incorporated by reference and a copy of which
has been filed  with the Commission  as an  exhibit to the  Schedule 14D-1.  The
Merger Agreement may be examined, and copies obtained, as set forth in Section 8
above.
 
    THE OFFER.  The Merger Agreement provides for the commencement of the Offer.
Purchaser  has  expressly reserved  the right  to increase  the price  per Share
payable in the Offer or to make any other changes in the terms and conditions of
the Offer, except without  the prior written consent  of the Company,  Purchaser
has  agreed  that it  will not  (i) reduce  the  number of  Shares sought  to be
purchased pursuant to the Offer, (ii) reduce the price per Share payable in  the
Offer,  (iii) change  the form of  consideration to  be paid in  the Offer, (iv)
impose additional conditions to the Offer or  amend any other term of the  Offer
in  any  manner  adverse  to  the  holders  of  Shares  or  (v)  amend  or waive
satisfaction of the Minimum Tender  Condition. Parent and Purchaser have  agreed
that Purchaser will not terminate or withdraw the Offer or extend the Expiration
Date unless at the Expiration Date the
 
                                       17
<PAGE>
conditions  to  the  Offer shall  not  have  been satisfied  or  earlier waived;
provided that notwithstanding the foregoing, Purchaser may, without the  consent
of  the Company, extend the Offer on one occasion following the time that all of
the conditions to the Offer have  been satisfied as of the scheduled  expiration
date  for a  period not  to exceed ten  business days,  if the  number of Shares
tendered, together with any Shares beneficially owned by Parent or Purchaser  or
any  other wholly-owned  subsidiary of  Parent, is less  than 80%  of the Shares
outstanding on the Expiration Date; provided, further, that if Purchaser  elects
to  extend the  Offer as set  forth above,  the obligation of  Purchaser, and of
Parent to cause Purchaser to,  accept for payment, purchase  and pay for all  of
the Shares tendered pursuant to the Offer and not withdrawn will be subject only
to  the Minimum Tender Condition and the  conditions set forth in Sections 3(A),
3(B) and 3(F) of Annex A to the Merger Agreement.
 
    BOARD REPRESENTATION.  The Merger Agreement provides that promptly upon  the
purchase  pursuant to the Offer by Parent  or Purchaser of such number of Shares
which represents a majority of all outstanding Shares on a fully diluted  basis,
(i) Parent shall be entitled to designate the number of directors, rounded up to
the  next whole number,  on the Board that  equals the product  of (x) the total
number of  directors  on  the  Board  (giving effect  to  the  election  of  any
additional  directors pursuant to  the Merger Agreement)  and (y) the percentage
(expressed as a decimal) that the number of Shares beneficially owned by  Parent
bears  to the  total number  of Shares outstanding,  and (ii)  the Company will,
subject to compliance  with Section  14(f) of the  Exchange Act  and Rule  14f-1
promulgated thereunder, take all action necessary to cause Parent's designees to
be  elected or appointed to the Board, including, without limitation, increasing
the number  of directors  or  seeking and  accepting resignations  of  incumbent
directors.  Notwithstanding the foregoing, until  the Effective Time the Company
will be entitled to retain  as members of its Board  at least two directors  who
are  directors of the Company on the  date of Merger Agreement, subject to their
availability and willingness  to serve. From  and after the  time, if any,  that
Parent's  designees constitute  a majority of  the Board pursuant  to the Merger
Agreement (the "Control Date") and prior to the Effective Time, any amendment of
the Merger Agreement, any  termination of the Merger  Agreement by the  Company,
any extension of time for the performance or waiver of the obligations of Parent
or  Purchaser, any waiver of any condition  to the obligations of the Company or
any of the  Company's rights  or other action  under the  Merger Agreement  will
require  the  concurrence of,  and  shall be  effective  only if  approved  by a
majority of the directors of the Company  then in office who are not  affiliates
of  Parent and  were not designated  by Parent (the  "Company Designees"), which
action shall be deemed to constitute the  action of the full Board even if  such
majority  of  the  Company  Designees  does not  constitute  a  majority  of all
directors then in office; provided that if there shall be no Company  Designees,
such actions may be effected by majority vote of the entire Board except that no
such action shall amend the terms of the Merger Agreement in a manner adverse to
the Shareholders of the Company.
 
    CONSIDERATION TO BE PAID IN THE MERGER.  The Merger Agreement provides that,
upon  the terms and subject to the  conditions set forth in the Merger Agreement
and in accordance  with the FBCA,  Purchaser will  be merged with  and into  the
Company  at the Effective Time. At the  Effective Time, by virtue of the Merger,
each Share  issued  and outstanding  immediately  prior to  the  Effective  Time
(excluding  Shares owned, directly or  indirectly, by the Company  or any of its
subsidiaries or  by Parent,  Purchaser or  any other  subsidiary of  Parent  and
Dissenting  Shares (as defined in the  Merger Agreement)) will be converted into
the right to receive  the Merger Consideration,  without interest thereon,  upon
surrender of the certificate formerly representing such Share, less any required
withholding  of taxes. Each share of common stock, par value $.001 per share, of
Purchaser issued and outstanding immediately prior to the Effective Time will be
converted into one issued and outstanding share of common stock, par value $.001
per share, of the  Surviving Corporation (as defined  in the Merger  Agreement),
which  will thereupon become  a direct, wholly-owned  subsidiary of Parent. Each
Share issued and  outstanding immediately prior  to the Effective  Time that  is
owned  by  (i) the  Company's  treasury or  by any  of  the Company's  direct or
indirect wholly-owned subsidiaries or (ii) Parent, Purchaser or any other direct
or indirect wholly-owned  subsidiary of  Parent, shall be  canceled and  retired
without  payment of  any consideration  therefor and  shall cease  to exist. The
Merger will
 
                                       18
<PAGE>
become effective upon the filing of the Articles of Merger with the Secretary of
State of the State of  Florida or at such time  thereafter as is agreed upon  by
the parties and specified in the Articles of Merger.
 
    COMPANY  STOCK OPTIONS  AND WARRANTS.   The Merger  Agreement provides that,
immediately after the Acceptance Date (as defined in the Merger Agreement), each
holder of  a  then outstanding  option  to purchase  Shares  (collectively,  the
"Options")  under the Company's 1988 Stock Option Plan, the Company's 1995 Stock
Option  Plan  and  the  Company's   Non-Employee  Director  Stock  Option   Plan
(collectively,  the "Stock  Option Plans"), whether  or not  then exercisable or
fully vested,  and each  holder of  the  warrants to  purchase an  aggregate  of
491,699  shares issued to certain parties (collectively, the "Warrants"), shall,
in settlement thereof,  be entitled to  receive for each  Share subject to  such
Option,  or Warrant,  an amount (subject  to any applicable  withholding tax) in
cash equal to the difference between the Offer Price and the per Share  exercise
price  of such Option, or Warrant, to the extent the Offer Price is greater than
the per Share exercise price of such Option or Warrant (such excess amount  with
respect  to Options being hereinafter referred to as the "Option Consideration",
and such amount with  respect to the Warrants  being hereinafter referred to  as
the "Warrant Consideration"); provided, however, that with respect to any person
subject  to Section 16(a) of the Exchange Act,  any such amount shall be paid as
soon as practicable after the first  date payment can be made without  liability
to  such person under Section 16(b) of the Exchange Act. Prior to the Acceptance
Date, the  Company will  use  its reasonable  efforts  to obtain  all  necessary
consents  or releases from holders of Options  under the Stock Option Plans, and
holders of  Warrants,  and take  any  such other  action  as may  be  reasonably
necessary  to give effect  to the transactions described  above (except for such
action that  may require  the approval  of the  Company's shareholders)  and  to
otherwise  cause each Option, and each Warrant, to be surrendered to the Company
and canceled, whether or not  any Option Consideration or Warrant  Consideration
is  payable with respect  thereto, at the  Acceptance Date. The  surrender of an
Option, or Warrant,  to the Company  shall be deemed  a release of  any and  all
rights the holder had or may have had in such Option, or Warrant, other than the
right   to  receive  the  Option  Consideration  or  Warrant  Consideration.  If
necessary, Parent will cause the Company to be provided with sufficient funds to
make the payments required above.
 
    SHAREHOLDER MEETING.  The  Merger Agreement provides  that the Company  will
take  all action  necessary, in  accordance with  the FBCA  and its  Articles of
Incorporation and Bylaws, to convene and hold a special meeting of Shareholders,
if necessary, as  promptly as  practicable for  the purpose  of considering  and
voting  upon  the Merger  Agreement and  the transactions  contemplated thereby,
including the  Merger.  Subject to  the  fiduciary  duties of  the  Board  under
applicable  law as advised in  writing by outside legal  counsel, the Board will
recommend that the holders of the Shares  will vote in favor of and approve  the
Merger  Agreement and the  Merger. In connection with  such meeting, the Company
will prepare and file with the  Commission, and in consultation with Parent  and
Purchaser,  as  soon  as practicable  after  the  consummation of  the  Offer, a
preliminary proxy or  information statement (the  "Preliminary Proxy  Statement"
and together with all amendments and supplements thereto being called the "Proxy
Statement")  relating to the Merger in accordance  with the Exchange Act and the
rules and regulations under the Exchange  Act, with respect to the  transactions
contemplated  by the  Merger Agreement. The  Company, Parent  and Purchaser will
cooperate with each other in the preparation of the Preliminary Proxy Statement.
The Company will use all reasonable efforts to respond promptly to any  comments
made  by the Commission with respect to  the Preliminary Proxy Statement, and to
cause the Proxy  Statement to  be mailed to  the Company's  Shareholders at  the
earliest practicable date.
 
    The Merger Agreement provides that if Parent, directly or indirectly through
Purchaser  or any  other wholly-owned subsidiary,  acquires at least  80% of the
outstanding Shares, each  of Parent,  Purchaser and  the Company  will take  all
necessary appropriate action to cause the Merger to become effective, as soon as
practicable  after  the consummation  of  the Offer,  without  a meeting  of the
Shareholders, in accordance with Section 1104 of the FBCA.
 
                                       19
<PAGE>
    REPRESENTATIONS AND  WARRANTIES.    The Merger  Agreement  contains  various
representations and warranties of the parties. These include representations and
warranties  by the Company  with respect to  (i) organization and qualification,
(ii) capitalization,  (iii)  corporate  power and  authority,  (iv)  absence  of
certain  changes, (v) Commission reports, (vi) governmental authorization, (vii)
non-contravention, (viii) investment banking fees and commissions, (ix) material
contracts, (x)  litigation, (xi)  benefit  plans, (xii)  intellectual  property,
(xiii)  restrictions on  operations, (xiv)  environmental laws,  (xv) compliance
with laws, (xvi) taxes, (xvii)  product registration and regulatory  compliance,
(xviii)  Company  action, (xix)  labor matters  and  (xx) the  Company's current
inventory.
 
    Parent and Purchaser also have  made certain representations and  warranties
with  respect to  (i) organization and  qualification, (ii)  corporate power and
authority, (iii)  governmental  authorization  and  (iv)  non-contravention.  No
representations  or warranties  made by the  Company, Parent  or Purchaser shall
survive beyond the Acceptance Date and no covenants made in the Merger Agreement
will survive  beyond  the  Control  Date; provided,  however,  that  the  Merger
Agreement  does not limit any covenant or agreement of the parties thereto which
by its terms contemplates performance after the Effective Time.
 
    CONDUCT OF BUSINESS PENDING THE MERGER.  The Company has agreed that  during
the  period  from the  date of  the  Merger Agreement  and continuing  until the
Control Date  or  until the  termination  of  the Merger  Agreement  (except  as
expressly contemplated or permitted by the Merger Agreement, or expressly agreed
to  by  Parent  in  writing)  the  Company will,  and  will  cause  each  of its
subsidiaries to,  conduct its  operations according  to its  ordinary and  usual
course  of  business  and  consistent  with past  practice  and  will  use their
commercially reasonable  efforts to  preserve intact  their respective  business
organizations,  keep available the services of  their officers and employees and
maintain satisfactory  relationships  with licensors,  suppliers,  distributors,
customers and others having business relationships with them.
 
    The  Company has agreed  that, during such  period, it will,  and will cause
each of its subsidiaries to, maintain its books and records in its usual  manner
and consistent with past practice and not permit a material change in any of its
financial  reporting,  tax,  or  accounting  practices  or  policies  or  in any
assumption  underlying  such  practices  or  policies,  or  in  any  method   of
calculating  any bad debt, contingency, or other reserve for financial reporting
purposes or  for  other  accounting  purposes, except  as  may  be  required  by
generally accepted accounting principles.
 
                                       20
<PAGE>
    The  Company has further agreed that during  each period neither it, nor any
of its subsidiaries, as the case may be, will, without the prior written consent
of Parent, (i)  issue, sell,  pledge or encumber,  or authorize  or propose  the
issuance,  sale, pledge or encumbrance of (A) any shares of capital stock of any
class (including the  Shares), or securities  convertible into, or  exchangeable
for,  any such shares,  or any rights,  warrants or options  to acquire any such
shares or other convertible or  exchangeable securities, or grant or  accelerate
any  right to convert  or exchange any securities  of the Company  or any of its
subsidiaries for  such  shares, other  than  shares issuable  upon  exercise  of
currently  outstanding stock options, stock awards or warrants, or (B) any other
securities in respect of,  in lieu of  or in substitution  for shares of  common
stock  outstanding on the  date of the Merger  Agreement (including the Shares);
(ii) redeem, purchase or  otherwise acquire, or propose  to redeem, purchase  or
otherwise  acquire, any  of its  outstanding securities  (including the Shares);
(iii) split, combine or reclassify any shares of its capital stock or declare or
pay any dividend or distribution on any shares of capital stock of the  Company;
(iv)  except as  set forth in  the Merger  Agreement, make any  acquisition of a
material amount of assets or securities, any disposition of a material amount of
assets or securities, or enter into or modify any material contract,  agreement,
commitment,  arrangement, license or  right or any  release or relinquishment of
any material contract rights, not in the ordinary course of business; (v) pledge
or encumber any material assets of the Company except in the ordinary course  of
business
consistent  with past practice; (vi) incur any long-term debt for borrowed money
or short-term  debt  for  borrowed  money, except  for  unsecured  debt  bearing
interest  at current  market rates incurred  in the ordinary  course of business
consistent with past  practice; (vii)  propose or  adopt any  amendments to  the
Articles  of Incorporation or Bylaws of the  Company or any of its subsidiaries;
(viii) enter  into  any  new employment  agreement  providing  for  compensation
(including  salary, bonus, benefits and all other forms of compensation, whether
immediately payable or  deferred) in  excess of $50,000  per year  or amend  any
existing  agreement with any officer, director or employee or grant any increase
in the compensation  or benefits  to officers, directors,  employees and  former
employees other than increases in the ordinary course of business and consistent
with  past practice or pursuant to the terms of agreements or plans as currently
in effect; (ix) adopt a plan  of complete or partial liquidation or  resolutions
providing  for the complete or partial liquidation or dissolution of the Company
or any of its subsidiaries; (x)  assume, guarantee, endorse or otherwise  become
liable  or  responsible (whether  directly, contingently  or otherwise)  for the
obligations of any other person except wholly-owned subsidiaries of the  Company
in the ordinary course of business and consistent with past practices; (xi) make
any  loans, advances or  capital contributions to, or  investments in, any other
person (other than  loans or  advances to  subsidiaries and  customary loans  or
advances  to employees in accordance with  past practices); (xii) adopt or amend
(except as may  be required  by law  or required  by the  Merger Agreement)  any
bonus, profit sharing, compensation, stock option, pension, retirement, deferred
compensation,  employment or other employee benefit plan, agreement, trust, fund
or other  arrangement for  the benefit  or  welfare of  any employee  or  former
employee;  (xiii) take any action other than  in the ordinary course of business
and consistent with past practice with respect to the grant of any severance  or
termination  pay or with respect  to any increase of  benefits payable under its
severance or termination pay policies in  effect on the date hereof; (xiv)  make
any  tax election or settle or compromise  any material Federal, state, local or
foreign income tax  liability, except  in the  ordinary course  of business  and
consistent with past practice; (xv) execute or enter into with the U.S. Internal
Revenue  Service  or  any other  taxing  authority  (i) any  agreement  or other
document extending or having the effect  of extending the period of  assessments
or  collection of any Federal,  state, local or foreign  taxes or (ii) a closing
agreement pursuant  to Section  7121 of  the Code,  or any  successor  provision
thereof,  or any similar agreement, pursuant  to any similar provision of state,
local or foreign laws;  (xvi) except as specifically  disclosed to Parent or  as
contemplated  by the capital expenditures  budget currently in effect, authorize
capital expenditures in excess of $50,000 in the aggregate; or (xvii)  authorize
or  propose  any  of  the  foregoing, or  enter  into  any  contract, agreement,
commitment or arrangement to do any of  the foregoing, or take any action  which
would make any representation or warranty of the Company in the Merger Agreement
untrue or incorrect.
 
                                       21
<PAGE>
    The  Company  has  further agreed  that  during  such period,  prior  to the
Acceptance Date,  it will  use its  reasonable best  efforts to  obtain  written
determinations  or permits from  the responsible governmental  authorities as to
which environmental permits  are required for  presently unpermitted  activities
including,  but not limited to, waste water  discharges and air emissions at the
Company's facilities in Florida  and operations in  Brussels, Belgium. Upon  the
receipt  of a determination that a permit is required, the Company will, as soon
as possible, file applications and support information necessary to obtain  such
permits  and will use  its reasonable best  efforts to expedite  the issuance of
such permits. With regard to Corvita Europe, a direct wholly-owned subsidiary of
the Company, the  Company has  agreed to file  the application  for such  permit
prior to the Acceptance Date.
 
    NO SOLICITATION.  The Merger Agreement provides that from and after the date
of the Merger Agreement until the earlier of the Control Date or the termination
of  the Merger Agreement, the  Company will not, and will  not permit any of its
subsidiaries,  or  any   of  its  or   their  officers,  directors,   employees,
representatives,  agents  or  affiliates,  (including,  without  limitation, any
investment banker, attorney or accountant retained by the Company or any of  its
subsidiaries)  to,  directly  or  indirectly,  initiate,  solicit  or  knowingly
encourage (including by way of furnishing non-public information or assistance),
or take any other action knowingly to facilitate, any inquiries or the making of
any proposal that  constitutes, or  may reasonably be  expected to  lead to,  an
Acquisition  Proposal (as defined below), or  enter into or maintain or continue
discussions or  negotiate with  any  person or  entity  in furtherance  of  such
inquiries  or  to obtain  an Acquisition  Proposal  or agree  to or  endorse any
Acquisition Proposal,  or authorize  or permit  any of  its or  their  officers,
directors  or employees  or any  of its  subsidiaries or  any investment banker,
financial advisor, attorney, accountant or  other representative retained by  it
or  any of  its subsidiaries  to take any  such action;  PROVIDED, HOWEVER, that
nothing contained in the Merger Agreement shall prohibit the Board of  Directors
of  the Company from furnishing information to, or entering into, maintaining or
continuing discussions or negotiations with, any person or entity that makes  an
unsolicited  Acquisition Proposal,  if the  Board of  Directors of  the Company,
after consultation with and based upon  the advice of independent legal  counsel
(who  may  be  the  Company's  regularly  engaged  independent  legal  counsel),
determines in good faith  that the failure  to take such  action could create  a
reasonable  possibility of a breach by the  Board of Directors of the Company of
its fiduciary duties to shareholders under  applicable law and, prior to  taking
such  action, the Company (i) provides reasonable notice to Parent to the effect
that it is taking such  action and (ii) receives from  such person or entity  an
executed  confidentiality agreement  in reasonably  customary form.  The Company
will use reasonable efforts to  keep Parent informed of  the status of any  such
Acquisition  Proposal.  For  purposes  of  the  Merger  Agreement,  "Acquisition
Proposal" means an  inquiry, offer or  proposal regarding any  of the  following
(other than the transactions contemplated by the Merger Agreement with Parent or
Purchaser)  involving the  Company or any  of its subsidiaries:  (w) any merger,
consolidation, share exchange, recapitalization,  business combination or  other
similar  transaction; (x) any sale,  lease, exchange, mortgage, pledge, transfer
or other disposition of all or substantially  all the assets of the Company  and
its subsidiaries, taken as a whole, in a single transaction or series of related
transactions;  (y) any tender offer or exchange  offer for 20 percent or more of
the outstanding  shares of  capital stock  of the  Company or  the filing  of  a
registration  statement under the Securities Act in connection therewith; or (z)
any public  announcement of  a proposal,  plan or  intention to  do any  of  the
foregoing or any agreement to engage in any of the foregoing.
 
    The  Company  has  also agreed  that,  except  as set  forth  in  the Merger
Agreement, the  Board of  Directors of  the  Company will  not (i)  withdraw  or
modify,  or propose  to withdraw  or modify,  in a  manner adverse  to Parent or
Purchaser, the approval or recommendation by the Board of the Offer, the  Merger
Agreement  or the Merger,  (ii) approve or  recommend, or propose  to approve or
recommend, any Acquisition Proposal or (iii) cause the Company to enter into any
agreement  with  respect  to  any  Acquisition  Proposal.  Notwithstanding   the
foregoing,  in the  event that prior  to the  time of acceptance  for payment of
Shares in the Offer the Board determines in good faith, after consultation  with
and based upon the advice of independent legal counsel (who may be the Company's
regularly  engaged independant  legal counsel),  that the  failure to  take such
action could create a reasonable
 
                                       22
<PAGE>
possibility of  a  breach by  the  Board of  Directors  of the  Company  of  its
fiduciary  duties to the Company's shareholders  under applicable law, the Board
may withdraw or modify its approval  or recommendation of the Offer, the  Merger
Agreement  and the Merger, approve or  recommend an Acquisition Proposal that is
more favorable  to shareholders  of the  Company than  the Offer  and Merger  (a
"Superior  Proposal")  or cause  the  Company to  enter  into an  agreement with
respect to a Superior  Proposal. The Company will  provide reasonable notice  to
Parent  or Purchaser to  the effect that it  is taking such  action, in no event
less than three (3) business days.
 
    FEES AND EXPENSES.  The Merger Agreement provides that, except as  described
below,  all costs and expenses incurred  in connection with the Merger Agreement
and the transactions contemplated  by the Merger Agreement  will be paid by  the
party  incurring the expenses; provided, however, that the costs of printing the
Proxy Statement  and  in each  case  all exhibits,  amendments  and  supplements
thereto shall be borne equally by the Company and Parent. The Company has agreed
to  pay Purchaser a fee equal to $4,000,000, which fee shall be inclusive of all
Expenses (as  defined in  the Merger  Agreement), upon  the termination  of  the
Merger  Agreement or the  transactions contemplated by  the Merger Agreement for
any of the following reasons: (i) the Company terminates after it has received a
Superior Proposal (as  defined in the  Merger Agreement), and  the Board,  after
consultation  with and  based upon the  written advice of  outside legal counsel
(who may be the Company's  regularly engaged outside legal counsel),  determines
in  good faith that the failure to  accept such Superior Proposal could create a
reasonable possibility  of a  breach by  the Board  of its  fiduciary duties  to
shareholders  under applicable law; (ii) Parent terminates because, prior to the
Acceptance Date, the Board shall have (x) withdrawn, modified or amended in  any
adverse  respect  its  approval  or recommendation  of  the  Merger,  the Merger
Agreement or the  transactions contemplated thereunder,  (y) recommended to  its
shareholders an Acquisition Proposal or (z) resolved to do any of the foregoing;
or  (iii) Parent terminates prior to the Acceptance  Date, if, as a result of an
intentional material breach  of the  Merger Agreement by  the Company  following
(but  not prior  to) the  Company's receipt  of an  Acquisition Proposal  by any
person or group other than Parent, (A)  the Company shall have failed to  comply
in  any  material respect  with  any of  the  material covenants  and agreements
contained in the Merger Agreement to be complied with or performed by such party
at or prior  to such date  of termination,  and such failure  continues for  ten
business  days after the actual  receipt by such party  of a written notice from
the other party setting  forth in detail  the nature of such  failure, or (B)  a
material  representation or warranty of the  other party contained in the Merger
Agreement shall be untrue in any material respect when made on or and as of  the
Acceptance  Date  as if  made on  the Acceptance  Date. Such  fee is  payable as
promptly as  practicable  but  not  later than  five  business  days  after  the
occurrence giving rise to such payment.
 
    CONDITIONS  TO THE MERGER.  Pursuant to the Merger Agreement, the obligation
of each party to  effect the Merger  is subject to  the satisfaction or  waiver,
where permissible, prior to the Effective Time, of the following conditions: (i)
Purchaser  shall have accepted for  payment and paid for  Shares pursuant to the
Offer in  accordance  with  the  terms thereof;  provided,  however,  that  this
condition  shall be deemed  satisfied with respect to  the obligations of Parent
and Purchaser if Purchaser shall have failed to purchase Shares pursuant to  the
Offer  in violation  of the  Merger Agreement  or the  terms of  the Offer; (ii)
unless the  Merger is  consummated pursuant  to Section  1104 of  the FBCA,  the
Merger  Agreement and  the Merger  shall have been  approved and  adopted by the
affirmative vote  of  shareholders of  the  Company  by the  requisite  vote  in
accordance  with  applicable  law;  and  (iii)  no  statute,  rule,  regulation,
executive  order,  decree  or  injunction  shall  have  been  enacted,  entered,
promulgated  or enforced by any Federal or state court or governmental authority
and no other action shall have been taken by any regulatory authority or  agency
which  is in effect  and has the  effect of prohibiting  the consummation of the
Merger.
 
    TERMINATION.   The  Merger  Agreement  may  be  terminated  and  the  Merger
contemplated  thereby  may be  abandoned  at any  time  notwithstanding approval
thereof by the shareholders of the Company, but prior to the Effective Time,  in
any  one  of the  following circumstances:  (a) by  mutual written  consent duly
authorized by the  Boards of Directors  of the  Company and the  Parent; (b)  by
Parent or
 
                                       23
<PAGE>
the  Company, if, without any  material breach by such  terminating party of its
obligations under the Merger Agreement, the  purchase of Shares pursuant to  the
Offer  shall not have occurred on or before August 9, 1996; (c) by Parent or the
Company, if the  Offer expires  or is terminated  or withdrawn  pursuant to  its
terms  without  any  Shares  being  purchased  in  accordance  with  the  Merger
Agreement; provided, however, that Parent may not terminate the Merger Agreement
pursuant to the foregoing, if Parent's termination of, or Purchaser's failure to
accept for payment or pay  for any Shares tendered  pursuant to, the Offer  does
not  follow the  occurrence, or  failure to occur,  as the  case may  be, of any
condition set forth in the Merger Agreement or is otherwise in violation of  the
terms of the Offer or the Merger Agreement; (d) by Parent or the Company, if any
Federal  or  state court  of competent  jurisdiction or  other Federal  or state
governmental body shall  have issued an  order, decree or  ruling, or taken  any
other  action permanently  restraining, enjoining  or otherwise  prohibiting the
Merger and such order,  decree, ruling or other  action shall have become  final
and  non-appealable; (e) by  the Company, if  it shall have  received a Superior
Proposal, and the  Board, after  consultation with  and based  upon the  written
advice  of outside  legal counsel  (who may  be the  Company's regularly engaged
outside legal counsel),  determines in good  faith that failure  to accept  such
Superior Proposal could create a reasonable possibility of a breach by the Board
of its fiduciary duties to shareholders under applicable law; (f) by Parent, but
only  prior to  the Acceptance Date,  if the  Board of Directors  of the Company
shall have  (i)  withdrawn, modified  or  amended  in any  adverse  respect  its
approval   or  recommendation  of  the  Merger  Agreement,  the  Merger  or  the
transactions contemplated  thereby,  (ii)  recommended to  its  shareholders  an
Acquisition Proposal or (iii) resolved to do any of the foregoing; (g) by Parent
or  the Company, but only  prior to the Acceptance Date,  if (A) the other party
shall have failed to  comply in any  material respect with  any of the  material
covenants  and agreements contained in the  Merger Agreement to be complied with
or performed by such  party at or  prior to such date  of termination, and  such
failure  continues for ten business days after  the actual receipt by such party
of a written notice from the other  party setting forth in detail the nature  of
such  failure, or (B) a  material representation or warranty  of the other party
contained in the Merger Agreement shall  be untrue in any material respect  when
made or, on and as of the Acceptance Date, as if made on the Acceptance Date; or
(h)  by the Company,  if the Offer  has not been  timely commenced in accordance
with the Merger Agreement.
 
    INDEMNIFICATION.  The Merger  Agreement provides that  until six years  from
the  Effective  Time,  the Surviving  Corporation  will maintain  all  rights to
indemnification now existing  in favor  of the  directors, officers,  employees,
fiduciaries  and agents of the Company as  provided in the Company's Articles of
Incorporation and Bylaws or otherwise in effect under any agreement or otherwise
on the date of the Merger Agreement  and that the Articles of Incorporation  and
Bylaws  of the Surviving Corporation shall not be amended to reduce or limit the
rights of indemnity afforded to the present and former directors and officers of
the Company, or the ability of the Surviving Corporation to indemnify them,  nor
to hinder, delay or make more difficult the exercise of such rights of indemnity
or  the  ability  to indemnify.  The  Surviving  Corporation will  at  all times
exercise the powers granted to it by its Articles of Incorporation, its  Bylaws,
and  by applicable  law to  indemnify and  hold harmless  to the  fullest extent
possible present  or  former  directors, officers,  employees,  fiduciaries  and
agents  of the  Company against  any threatened  or actual  claim, action, suit,
proceeding or investigation made against them arising from their service in such
capacities (or service in such capacities for another enterprise at the  request
of  the Company)  prior to, and  including the  Effective Time for  at least six
years from the Effective Time. Parent  will assume and perform such  obligations
under  the Merger Agreement;  PROVIDED, that any indemnified  party makes a good
faith effort (which shall not include any requirement to bring any suit,  claim,
action,    or   other    proceeding)   to    cause   the    Surviving   Corpora-
tion to perform  its obligations  under the Merger  Agreement before  requesting
Parent  to assume and perform such  obligations. Should any threatened or actual
claim, action, suit, proceeding or investigation be made against any present  or
former  director, officer, employee, fiduciary or  agent of the Company, arising
from his or her services as such, within six years from the Effective Time,  the
foregoing provisions shall continue in effect until the final disposition of all
such  claims. Any indemnified  party wishing to  claim indemnification under the
Merger Agreement, upon learning of any  such action, suit, claim, proceeding  or
investigation,    must   notify    Parent   and    the   Surviving   Corporation
 
                                       24
<PAGE>
within 15 days thereof; PROVIDED, HOWEVER, that any failure so to notify  Parent
and  the Surviving Corporation  of any obligation  to indemnify such indemnified
party or of any other obligation imposed by this provision will not affect  such
obligations  except to  the extent  Parent and/or  the Surviving  Corporation is
actually prejudiced  thereby.  Parent  and the  Surviving  Corporation  will  be
entitled  to assume the defense  of any such action,  suit, claim, proceeding or
investigation with  counsel of  its choice,  unless there  is, under  applicable
standards  of professional conduct, a conflict  of any significant issue between
the positions of Parent and the Surviving Corporation, on the one hand, and  the
indemnified  parties, on the other, in which  event the indemnified parties as a
group may retain one  law firm to  represent them with  respect to such  matter.
Neither  Parent  or  the  Surviving  Corporation,  on  the  one  hand,  nor  the
indemnified parties, on the other hand, may settle any such action, suit, claim,
proceeding or  investigation without  the  prior written  consent of  the  other
party, which consent shall not be unreasonably withheld or delayed.
 
    In  addition  to the  foregoing, Parent  has agreed  to cause  the Surviving
Corporation  to  honor  in  accordance  with  their  terms  any  indemnification
agreements  in existence on the date of the Merger Agreement between the Company
and any present or former director, officer, employee, fiduciary or agent of the
Company.
 
    The parties  have  agreed  that  the  foregoing  provisions  of  the  Merger
Agreement  will  not require  Parent or  the  Surviving Corporation  to maintain
directors' and officers' insurance  coverage in favor  of the Company's  present
and former directors and officers.
 
    AMENDMENT.   To the extent permitted by applicable law, the Merger Agreement
may be amended by  action taken by or  on behalf of the  Boards of Directors  of
Parent,  Purchaser and the Company  at any time before  or after adoption of the
Merger Agreement by the  Shareholders. The Merger Agreement  may not be  amended
except by an instrument in writing signed on behalf of all of the parties.
 
    TIMING.   The exact timing and details for the Merger will depend upon legal
requirements and a  variety of  other factors,  including the  number of  Shares
acquired  by Purchaser pursuant  to the Offer. Although  Purchaser has agreed to
cause the Merger to be consummated on the terms set forth above, there can be no
assurance as to the timing of the Merger.
 
    FLORIDA  LAW.    The  Board  has  approved  the  Merger  Agreement  and  the
transactions  contemplated  by  it,  including the  Offer,  the  Merger  and the
Shareholders Agreement,  and  the  entry  by  Purchaser  into  the  Shareholders
Agreement,  for  purposes  of  Sections 607.0901  ("Section  901")  and 607.0902
("Section 902") of the FBCA. Accordingly, the restrictions of Section 901 do not
apply to the transactions contemplated by the Offer, the Merger Agreement or the
Shareholders Agreement.  Section  901  of  the FBCA,  in  general,  prevents  an
"interested  shareholder" (generally,  a shareholder who  beneficially owns more
than 10% of a Florida corporation's  outstanding voting stock) from engaging  in
certain  "affiliated transactions" (defined to include mergers and acquisitions)
with such corporation without the approval  of the holders of two-thirds of  the
corporation's  voting  shares  (excluding  all shares  owned  by  the interested
shareholder) unless (i) a majority of the corporation's disinterested  directors
approve the affiliated transaction, (ii) the interested shareholder beneficially
owns  at least 90% of the  corporation's outstanding voting shares, exclusive of
shares acquired directly from the corporation in a transaction not approved by a
majority of the  disinterested directors, (iii)  the interested shareholder  has
been the beneficial owner of at least 80% of the corporation's voting shares for
at  least five (5) years preceding the  date the transaction is disclosed to the
public or  the  shareholders,  whichever  is  earlier,  or  (iv)  certain  other
statutory  conditions have been met. As described above, Section 901 of the FBCA
does not  apply to  the Offer,  the Merger  or the  Shareholders Agreement.  The
foregoing  summary  of  Section 901  does  not  purport to  be  complete  and is
qualified in its entirety by reference to the provisions of Section 901.
 
    Similarly, Section 902 of the FBCA does  not apply to the Offer, the  Merger
or  the Shareholders Agreement. Section 902 provides, in general, that shares of
an "Issuing Public Corporation" acquired in a "control share acquisition,"  with
certain  exceptions, will have no voting  rights unless these rights are granted
by resolution pursuant to a vote of the  holders of a majority of the shares  of
each class or
 
                                       25
<PAGE>
series  entitled to vote separately on such a proposal (excluding all interested
shareholders). "Control shares" are shares which, when added to all other shares
which a person owns or has the power to vote, would give that person any of  the
following ranges of voting power: (i) one-fifth or more but less than one-third;
(ii)  one-third or more but less than a majority; or (iii) more than a majority.
However, shareholder approval is not required where the acquisition of shares is
approved by the Issuing  Public Corporation's board  of directors. As  described
above,  Section 902 does not apply to  the Offer, the Merger or the Shareholders
Agreement. The foregoing summary of Section 902 does not purport to be  complete
and is qualified in its entirety by reference to the provisions of Section 902.
 
THE SHAREHOLDERS AGREEMENT
 
    As  an inducement  and a  condition to  entering into  the Merger Agreement,
Parent  required  that   the  Selling  Shareholders   agree,  and  the   Selling
Shareholders agreed, to enter into the Shareholders Agreement.
 
    The  following  is  a summary  of  the  material terms  of  the Shareholders
Agreement. This  summary  is  not  a  complete  description  of  the  terms  and
conditions  thereof and is  qualified in its  entirety by reference  to the full
text thereof which is incorporated herein by  reference and a copy of which  has
been  filed  with  the Commission  as  an  exhibit to  the  Schedule  14D-1. The
Shareholders Agreement may be examined, and  copies thereof may be obtained,  as
set forth in Section 8 above.
 
    TENDER  OF SHARES.   Upon  the terms  and subject  to the  conditions of the
Shareholders Agreement, each  Selling Shareholder has  agreed to validly  tender
(and not to withdraw) pursuant to and in accordance with the terms of the Offer,
not  later than  the fifth  business day  after commencement  of the  Offer, the
number of Shares set forth opposite such shareholder's name on Schedule I to the
Shareholders Agreement and beneficially  owned by him, her  or it. Each  Selling
Shareholder  has acknowledged and  agreed that Purchaser's  obligation to accept
for payment  and pay  for  Shares in  the  Offer is  subject  to the  terms  and
conditions of the Offer.
 
    VOTING.    Each  Selling  Shareholder  has  agreed  that  during  the period
commencing on the date  of the Shareholders Agreement  and continuing until  the
first  to occur of the Effective Time  or termination of the Merger Agreement in
accordance with its terms, at any meeting of the Company's shareholders, however
called, or in connection with any written consent of the Company's shareholders,
such Selling Shareholder will  vote (or cause  to be voted)  the Shares held  of
record  or  beneficially  owned  by such  Selling  Shareholder,  whether issued,
heretofore owned  or  hereafter  acquired,  (i) in  favor  of  the  Merger,  the
execution  and delivery by the Company of  the Merger Agreement and the approval
of the terms thereof and  each of the other  actions contemplated by the  Merger
Agreement and the Shareholders Agreement and any actions required in furtherance
thereof;  (ii) against any action or agreement  that would result in a breach in
any respect of any covenant, representation or warranty or any other  obligation
or  agreement  of the  Company under  the Merger  Agreement or  the Shareholders
Agreement (after  giving effect  to any  materiality or  similar  qualifications
contained  therein);  and (iii)  except  as otherwise  agreed  to in  writing in
advance by Parent, against the following actions (other than the Merger and  the
transactions  contemplated  by  the  Merger  Agreement):  (A)  any extraordinary
corporate transaction,  such  as  a  merger,  consolidation  or  other  business
combination  involving the  Company or  its subsidiaries;  (B) a  sale, lease or
transfer of a material amount of assets of the Company or its subsidiaries, or a
reorganization, recapitalization, dissolution or  liquidation of the Company  or
its subsidiaries; (C) (1) any change in a majority of the persons who constitute
the  Board  of  Directors  of  the  Company;  (2)  any  change  in  the  present
capitalization of the  Company or  any amendment  of the  Company's Articles  of
Incorporation  or  By-Laws;  (3)  any other  material  change  in  the Company's
corporate structure or business; or (4)  any other action involving the  Company
or  its  subsidiaries which  is intended,  or could  reasonably be  expected, to
impede, interfere  with, delay,  postpone, or  materially adversely  affect  the
Merger  and the transactions contemplated by  the Shareholders Agreement and the
Merger Agreement. Each Selling Shareholder further agreed not to enter into  any
agreement  or understanding with any person or entity, the effect of which would
be inconsistent or violative of the provisions and agreements described above.
 
                                       26
<PAGE>
    ACQUIRED SHARES.   Each  Selling Shareholder  also has  agreed that  if  the
Merger  Agreement  is terminated  by Parent  in accordance  with any  of Section
9.1(f) or 9.1(g) thereof,  or by the Company  in accordance with Section  9.1(e)
thereof,  and, during the period commencing on  the date of such termination and
continuing until  the first  anniversary  of the  date  hereof, the  Shares  are
disposed,  transferred  or  sold ("Sale")  to  a  Person (other  than  Parent or
Purchaser) in a transaction in which there is, directly or indirectly, a  change
(x)  in the ownership of  a majority of the  Shares or (y) in  a majority of the
individuals who constitute the Company's Board  of Directors on the date of  the
Shareholders  Agreement,  for  a  per  share  amount  in  excess  of  the  Offer
Consideration, Parent shall be entitled to,  and each Shareholder will agree  to
pay  to Parent,  an amount  per share  in cash  equal to  50% of  the difference
between the gross proceeds received, or  receivable, by such Shareholder in  the
sale and the Offer Price. Any such payment due and owing to Parent shall be made
within three (3) days of the Selling Shareholders' receipt thereof. Each Selling
Shareholder  has agreed to effect any sale of Shares (other than pursuant to the
Merger Agreement) in an  arms' length bona fide  transaction to an  unaffiliated
person.
 
    REPRESENTATIONS,  WARRANTIES, COVENANTS AND OTHER  AGREEMENTS.  Each Selling
Shareholder  has  made   certain  customary   representations,  warranties   and
covenants,  including  with respect  to (i)  ownership of  the Shares,  (ii) the
authority to  enter into  and  perform its  obligations under  the  Shareholders
Agreement,  (iii)  the absence  of  required consents  or  contractual conflicts
relating  to  the  Shareholders  Agreement,  (iv)  the  absence  of  liens   and
encumbrances  on and in  respect of its  Shares, (v) no  finder's fees, (vi) the
solicitation of Acquisition Proposals, (vii) transfers of Shares, (viii)  waiver
of appraisal rights and (ix) further assurances.
 
    TERMINATION.   Other than as provided  therein, the covenants and agreements
contained in the Shareholders Agreement will  terminate upon the earlier of  (x)
the Effective Time and (y) the first anniversary of the date of the Shareholders
Agreement;   provided  however,  that   the  provisions  relating   to  (i)  the
solicitation of Acquisition Proposals, (ii) the transfer of Shares and (iii) the
deposit of Shares into a voting trust or entering into a voting agreement, shall
terminate upon any earlier termination of the Merger Agreement.
 
AGREEMENTS FOR OWNERSHIP OF CORVITA CANADA, INC.
 
    As a condition to  entering into the Merger  Agreement, the Company  entered
into  two stock purchase agreements  and other related transactions contemplated
by such stock purchase agreements, by which it agreed to purchase, directly  and
indirectly,  ownership  of all  of the  issued and  outstanding common  stock of
Corvita Canada, Inc., an Ontario, Canada corporation ("Corvita Canada"), that is
not currently owned by the Company.  Currently, the Company owns 115,000  shares
of  Corvita Canada common  stock, 120,000 shares of  Corvita Canada common stock
are owned  by  Cardiovascular Innovations  Canada,  Inc. ("CICI"),  an  Ontario,
Canada  corporation,  and 3,500  shares  of Corvita  Canada  stock are  owned by
Research Visions Canada, Inc., a Canadian corporation ("RVC").
 
    CICI STOCK PURCHASE AGREEMENT.  Pursuant to an agreement, dated as of  April
11,  1996, among George  A. Adams, Ph.D.,  David C. MacGregor,  M.D., Gregory J.
Wilson and Jennie M.  Wilson, as trustees for  the Gregory Wilson Family  Trust,
and  Jennie M.  Wilson (collectively, the  "CICI Sellers") and  the Company, the
Company agreed to  purchase all of  the issued and  outstanding common stock  of
CICI,  for an aggregate purchase price  of US$1,943,320. The Company also agreed
to repay to the CICI Sellers the unpaid balance of outstanding shareholder loans
previously made by the CICI Sellers to CICI, together with accrued interest,  in
the  aggregate amount of  CDN$16,320. The Company's purchase  of the CICI common
stock is subject to the conditions, among others, that (a) the Company,  Parent,
and  Purchaser shall  have entered into  the Merger Agreement  and (b) Purchaser
shall have made the Offer and shall  have accepted for payment and paid for  all
of the Shares validly tendered and not withdrawn pursuant to the Offer.
 
                                       27
<PAGE>
    RVC  STOCK PURCHASE AGREEMENT.  Pursuant to  an agreement, dated as of April
11, 1996, between  RVC and  the Company, the  Company agreed  to purchase  3,500
shares  of Corvita Canada  common stock owned  by RVC for  an aggregate purchase
price of US$56,680.
 
    RELATED AGREEMENTS.   The  other agreements  related to  the stock  purchase
agreements described above are: (a) an escrow agreement whereby the certificates
for  shares of CICI  common stock will  be held in  escrow pending completion or
termination of the CICI stock purchase; (b) a trust deposit agreement whereby  a
portion of the purchase price for CICI common stock being sold to the Company by
David  C. MacGregor,  M.D. will be  held in  trust for the  payment of potential
Canadian  withholding  tax  liability  with  respect  to  his  stock  sale  (or,
alternatively, for release to Dr. MacGregor upon his provision of an appropriate
certificate  issued by  the Canadian  Minister of  National Revenue  pursuant to
section 116 of the  Income Tax Act  of Canada); (c)  a letter agreement  between
Parent  and Dr. MacGregor,  whereby Parent has  agreed that it  will not make or
cause to be  made any election  under Section 338  of the Code  with respect  to
Purchaser's acquisition of the stock of the Company pursuant to the terms of the
Merger  Agreement, and has further agreed that  in the event Parent does make or
cause to  be  made  such a  Section  338  election, Parent  will  indemnify  Dr.
MacGregor  for U.S.  federal income  tax liability arising  as a  result of such
election; (d)  a letter  agreement  between Parent  and Corvita  Canada  whereby
Parent agrees to reimburse Corvita Canada an amount of up to US $250,000 for the
loss  of preferential rates for certain  refundable research and development tax
credits, in the event that the Merger Agreement is terminated by the Company  in
certain  specified circumstance and provided that such credits are actually lost
by Corvita  Canada as  a result  of the  execution of  the CICI  Stock  Purchase
Agreement  and  the RVC  Stock Purchase  Agreement; and  (e) a  letter agreement
between Corvita Canada and  Parent whereby Corvita Canada  agrees that from  the
date of the letter agreement until the earlier of the completion of the purchase
by  the Company  of the common  stock of CICI  or the termination  of the Merger
Agreement, Corvita Canada will conduct its operations and maintain its books and
records in its usual manner and consistently with past practice and will refrain
from entering into  certain specified  transactions and  agreements without  the
prior written consent of the Parent.
 
LOAN AGREEMENT AND LICENSE AGREEMENT
 
    Parent  and the Company entered into a  loan agreement, dated April 11, 1996
(the "Loan Agreement"), whereby  Parent agreed to make  advances to the  Company
from  time to  time until  the earlier to  occur of  (a) the  termination of the
Merger Agreement and (b) August 9, 1996, in an amount not to exceed  $2,000,000.
Borrowings  under the Loan Agreement  are evidenced by a  promissory note of the
Company, dated April  11, 1995 (the  "Promissory Note"), bearing  interest at  a
rate  of  8.25% per  annum, such  interest  is payable  monthly in  arrears, and
outstanding principal amounts are due and  payable upon demand of Parent at  any
time  on  or  after  the earlier  to  occur  of  (i) August  9,  1996,  (ii) the
termination of the Merger  Agreement and (iii) the  consummation of the  Merger.
Pursuant to the Loan Agreement and the Promissory Note, Parent advanced $550,000
to  the Company  on April 12,  1996, and agreed  to will advance  up to $150,000
every five  business  days  upon  the Company's  request,  after  receiving  the
Company's  certificate to the effect that (x)  the requested amount will be used
to pay certain  obligations of the  Company that were  incurred in the  ordinary
course  of  business and  that  are set  forth  in a  schedule  accompanying the
request, or that are obligations set forth in a schedule to the Loan  Agreement,
and  (y) that the Company is continuing  to operate its business in the ordinary
course consistent with past practice.
 
    In connection with the  Loan Agreement and Promissory  Note, Parent and  the
Company  entered into  a License Agreement,  dated April 11,  1995 (the "License
Agreement"), whereby  the  Company  granted  Parent  a  non-exclusive  worldwide
license  to make, have made, use, sell  and otherwise dispose of a polycarbonate
urethane material that is covered by, whose  method of making or use is  covered
by,  or that is a component of an article of manufacture covered by at least one
claim of certain patents and patent  applications owned by the Company, and  any
related  counterparts, foreign equivalents, divisions and continuations in part.
The License Agreement may be terminated by  the Company upon payment in full  of
principal and interest payable to Parent under the Loan Agreement and Promissory
 
                                       28
<PAGE>
Note,  provided that such payment is made on or before the earlier of (x) August
9, 1996 and (y) forty-five days after the Merger Agreement is terminated in  one
of  a  number  of  specified  circumstances.  In  certain  other  circumstances,
including the termination of  the Merger Agreement  because the Company's  Board
withdraws  its recommendation of the Merger  or the institution of bankruptcy or
insolvency proceedings by the Company or by certain undisclosed creditors of the
Company, the License Agreement may not be terminated even if the Company  repays
in  full all amounts of principal and interest payable to Parent under the terms
of the Loan Agreement and Promissory Note.
 
TRANSFERS OF SHARES OF EUROPEAN SUBSIDIARIES
 
    Norman R.  Weldon,  Ph.D.,  the  Company's  President  and  Chief  Executive
Officer,  has agreed to transfer to an individual to be designated by the Parent
one share of the  capital stock of Corvita  Europe, S.A. ("Corvita Europe")  now
owned  by  Dr.  Weldon; Herbert  Kontges,  Ph.D., Managing  Director  of Corvita
Europe, has agreed to transfer to an  individual to be designated by the  Parent
one  share of the capital stock of Corvita  Europe now owned by Dr. Kontges; and
Dr. Weldon has agreed to transfer to an individual designated by the Parent five
shares of  the  capital stock  of  Laboratoire Corvita,  S.A.R.L.  ("Laboratoire
Corvita")  now owned  by Dr. Weldon.  Corvita Europe is  a corporation organized
under the  laws of  Belgium; it  has  51,500 shares  of issued  and  outstanding
capital  stock, 51,498 of which are owned by the Company. Laboratoire Corvita is
a corporation organized under the  laws of France; it  has 500 shares of  issued
and  outstanding capital stock, 495 of which are owned by the Company. The share
transfers by Dr. Weldon and Dr. Kontges will become effective on the  Acceptance
Date.  Dr. Weldon and Dr. Kontges have  delivered stock powers to the Parent for
the purpose of effecting such share  transfers in accordance with the  foregoing
agreements.
 
MATERIAL AGREEMENTS
 
    The  Company and  Corvita Europe have  entered into  certain agreements with
third parties, which  agreements are designated  as "Material Agreements"  under
the  provisions of  the Merger  Agreement and  are required  to be  in effect to
satisfy the conditions of the Offer. The agreements so designated include: (a) a
License Termination Agreement, dated as of December 1, 1995, between the Company
and  Sumitomo  Bakelite   Co.,  Ltd.,  a   Japanese  corporation   ("Sumitomo"),
terminating  the  License Agreement,  dated  as of  June  19, 1990,  between the
Company and Sumitomo;  (b) a License  Agreement, dated as  of January 24,  1996,
among  Corvita  Europe, Jean  Pierre Dereume,  M.D.,  and L'Universite  Libre de
Bruxelles; and (c) a  Consent to Assignment provided  to the Company by  Vascor,
Inc.,  dated April 9, 1996,  whereby Vascor, Inc. consents  to the assignment to
PTG of  certain of  the Company's  rights and  obligations under  a License  and
Supply Agreement, dated November 30, 1993, between Vascor, Inc. and the Company;
and (e) the CICI and RVC Stock Purchase Agreements.
 
OTHER MATTERS
 
    VOTE REQUIRED TO APPROVE THE MERGER.  The FBCA requires, among other things,
that the adoption of any plan of merger or consolidation must be approved by the
Board  and  generally  by  the  holders  of  the  Company's  outstanding  voting
securities. The Board has approved the  Offer and the Merger; consequently,  the
only additional action by the Company that may be necessary to effect the Merger
is  approval of  its shareholders if  the short-form  merger procedure described
below  is  not  available.  Under  the  FBCA  and  the  Company's  Articles   of
Incorporation,  the affirmative vote of holders of a majority of the outstanding
Shares is generally required to approve the Merger. However, Section 607.1104 of
the FBCA provides that, if a parent company  owns at least 80% of each class  of
stock  of a subsidiary, the parent company can effect a "short-form" merger with
that subsidiary without any action by the other shareholders of that subsidiary.
Accordingly, if, as a  result of the Offer  or otherwise, Purchaser acquires  at
least  80% of the Shares, the Purchaser could, and intends to, effect the Merger
without prior notice to, or any action by, any other shareholder of the Company,
except as required under the FBCA. If the Purchaser acquires, through the  Offer
or  otherwise,  voting  power  with  respect  to  at  least  a  majority  of the
outstanding Shares, the Purchaser would  have sufficient voting power to  effect
the Merger without the vote of any other shareholder of the Company.
 
                                       29
<PAGE>
    APPRAISAL  RIGHTS.   Pursuant to  Section 607.1302  of the  FBCA, holders of
Shares do not have dissenters' rights as a result of the Offer. If the Merger is
effected with a vote  of the Company's  shareholders and if  on the record  date
fixed  to determine the shareholders entitled to  vote, the Shares are quoted on
NASDAQ or other national securities exchange or  are held of record by 2,000  or
more  of such shareholders, then holders of the Shares will not have dissenter's
rights under the FBCA.  If, however, the Merger  is consummated with or  without
the  vote of  the Company's  shareholders but  the Shares  are not  so listed or
designated or are not held of record by at least 2,000 shareholders, holders  of
Shares will have certain rights pursuant to the provisions of Sections 607.1301,
607.1302, and 607.1320 of the FBCA to dissent and demand determination of and to
receive  payment in cash  of the fair  value of, their  Shares. If the statutory
procedures  were  complied  with,   such  rights  could   lead  to  a   judicial
determination  of the fair value required to  be paid in cash to such dissenting
holders for their Shares. Any such  judicial determination of the fair value  of
the  Shares or the  market value of  the Shares could  be more or  less than the
Offer Price  or  the  price  provided  for  in  the  Merger  Agreement.  Section
607.1301(2)  of FBCA defines "fair  value" as the value  of the shares excluding
any appreciation or depreciation in anticipation of the transaction unless  such
exclusion would be inequitable.
 
    If  any holder of Shares who asserts dissenters' rights under the FBCA fails
to perfect,  or  effectively  withdraws  or loses  his  dissenters'  rights,  as
provided  in the FBCA, the Shares of such shareholder will be converted into the
right to receive the Merger Consideration  provided for in the Merger  Agreement
in  accordance with the Merger Agreement. A  shareholder may withdraw his or her
notice of election to dissent by delivery  to Parent of a written withdrawal  of
his or her notice of election to dissent and acceptance of the Merger.
 
    FAILURE  TO FOLLOW THE STEPS REQUIRED BY THE FBCA FOR PERFECTING DISSENTERS'
RIGHTS MAY RESULT IN THE LOSS OF SUCH RIGHTS.
 
    GOING PRIVATE TRANSACTIONS.  Rule 13e-3 under the Exchange Act is applicable
to certain "going-private"  transactions. Purchaser does  not believe that  Rule
13e-3  will be applicable to the Merger,  unless, among other things, the Merger
is completed more than one year  after termination of the Offer. If  applicable,
Rule 13e-3 would require, among other things, that certain financial information
regarding  the Company  and certain  information regarding  the fairness  of the
Merger and the consideration offered to minority Shareholders be filed with  the
Commission  and disclosed to minority Shareholders  prior to consummation of the
Merger.
 
13.  DIVIDENDS AND DISTRIBUTIONS
 
    If, on or after  the date of  the Merger Agreement,  the Company should  (i)
split,  combine  or  otherwise change  the  Shares or  its  capitalization, (ii)
acquire currently  outstanding Shares  or  otherwise cause  a reduction  in  the
number of outstanding Shares or (iii) issue or sell additional Shares, shares of
any  other class  of capital  stock, other  voting securities  or any securities
convertible into, or rights, warrants  or options, conditional or otherwise,  to
acquire,  any of the  foregoing, then, subject  to the provisions  of Section 14
below, Purchaser, in its sole discretion, may make such adjustments as it  deems
appropriate  in the Offer Price and other terms of the Offer, including, without
limitation, the number or type of securities offered to be purchased.
 
    If, on or after the  date of the Merger  Agreement, the Company declares  or
pays  any cash dividend  on Shares, makes  other distributions on  the Shares or
issues with respect  to the Shares  any additional Shares,  shares of any  other
class  of capital stock,  other voting securities  or any securities convertible
into, or rights, warrants or options, conditional or otherwise, to acquire,  any
of  the foregoing, payable  or distributable to Shareholders  of record prior to
the transfer of the Shares purchased pursuant  to the Offer to Purchaser or  its
nominee  or transferee on the Company's stock transfer records, then, subject to
Section 14 below, (i) the Offer Price may, in the sole discretion of  Purchaser,
be  reduced by the amount of any cash dividend or cash distribution and (ii) the
whole of any non-cash dividend, distribution  or issuance to be received by  the
tendering   Shareholders  will  (a)  be  received  and  held  by  the  tendering
Shareholders for the account  of Purchaser and will  be required to be  promptly
remitted and transferred by each tendering Shareholder to the Depositary for the
account of Purchaser,
 
                                       30
<PAGE>
accompanied  by appropriate documentation of transfer or (b) at the direction of
Purchaser, be exercised for the benefit of Purchaser, in which case the proceeds
of exercise promptly will be remitted  to Purchaser. Pending the remittance  and
subject  to  applicable  law,  Purchaser  will be  entitled  to  all  rights and
privileges as owner of any non-cash dividend, distribution, issuance or proceeds
and may withhold  the entire  Offer Price  or deduct  from the  Offer Price  the
amount or value of the non-cash dividend, distribution, issuance or proceeds, as
determined by Purchaser in its sole discretion.
 
    Pursuant  to the  terms of the  Merger Agreement, the  Company is prohibited
from taking any  of the actions  described in the  two preceding paragraphs  and
nothing  in this  Offer to  Purchase shall constitute  a waiver  by Purchaser or
Parent of  any of  its rights  under the  Merger Agreement  or a  limitation  of
remedies  available  to  Purchaser  or  Parent  for  any  breach  of  the Merger
Agreement, including termination of the Merger Agreement.
 
14.  CERTAIN CONDITIONS OF THE OFFER
 
    Notwithstanding any other  provision of  the Offer, Purchaser  shall not  be
required  to  accept  for  payment  or,  subject  to  any  applicable  rules and
regulations of the Commission, including  Rule 14e-1(c) under the Exchange  Act,
to  pay for any Shares tendered, and may postpone the acceptance for payment or,
subject to the restriction referred to  above, payment for any Shares  tendered,
and,  subject to the provisions of the Merger Agreement, may terminate the Offer
(whether or not  any Shares have  theretofore been purchased  or paid for),  if,
there  have not been  validly tendered and  not withdrawn prior  to the time the
Offer shall otherwise expire a number  of Shares that constitutes a majority  of
the  Shares outstanding on a fully-diluted basis  on the date of purchase ("on a
fully-diluted basis" meaning, as of any date, the number of Shares  outstanding,
together  with  Shares  the  Company  is  then  required  to  issue  pursuant to
obligations outstanding  at  that date  under  employee stock  option  or  other
benefit  plans or otherwise), any formal investigations relating to the Offer or
the Merger that may have  been opened by the  Antitrust Division or the  Federal
Trade  Commission  ("FTC") shall  not  have terminated,  or  at any  time before
acceptance for payment  of, of payment  for, such Shares,  any of the  following
events shall occur or be deemed to have occurred:
 
       (A) there  shall  be  pending  any  suit,  action  or  proceeding  by any
           governmental entity  (1) challenging  the  acquisition by  Parent  or
    Purchaser  of any Shares under the Offer  or seeking to restrain or prohibit
    the making or consummation of the  Offer or Merger, (2) seeking to  prohibit
    or materially limit the ownership or operation by the Company, Parent or any
    of  their respective subsidiaries  of a material portion  of the business or
    assets of the Company and its subsidiaries, taken as a whole, or Parent  and
    its  subsidiaries, taken as a  whole, or to compel  the Company or Parent to
    dispose of or hold separate any  material portion of the business or  assets
    of  the Company and  its subsidiaries, taken  as a whole,  or Parent and its
    subsidiaries, taken as a whole, as a result of the Offer or any of the other
    transactions contemplated by  the Merger  Agreement, (3)  seeking to  impose
    material  limitations on  the ability of  Parent or Purchaser  to acquire or
    hold, or  exercise full  rights of  ownership of,  any Shares  accepted  for
    payment  pursuant to the Offer, including,  without limitation, the right to
    vote such Shares on  all matters properly presented  to the Shareholders  of
    the  Company, or (4) seeking  to prohibit Parent or  any of its subsidiaries
    from effectively controlling in any material respect any material portion of
    the business or operations of the Company and its subsidiaries; or
 
       (B) any governmental  entity  or  federal or  state  court  of  competent
           jurisdiction  shall  have enacted,  issued, promulgated,  enforced or
    entered any statute, rule,  regulation, executive order, decree,  injunction
    or other order that is in effect and that (1) materially restricts, prevents
    or  prohibits  consummation  of  the  Offer,  the  Merger  or  any  material
    transaction contemplated by  the Merger Agreement,  (2) prohibits or  limits
    materially the ownership or operation by the Company, Parent or any of their
    subsidiaries of all or any material portion of the business or assets of the
    Company  and  its subsidiaries  taken as  a whole,  or compels  the Company,
    Parent or any of their  subsidiaries to dispose of  or hold separate all  or
    any  material  portion of  the business  or  assets of  the Company  and its
    subsidiaries taken  as a  whole,  (3) imposes  material limitations  on  the
    ability
 
                                       31
<PAGE>
    of  Parent or any of its subsidiaries to exercise effectively full rights of
    ownership of any Shares,  including, without limitation,  the right to  vote
    any  Shares acquired by Purchaser pursuant to  the Offer or otherwise on all
    matters properly presented to the Company's shareholders, including, without
    limitation, the  approval  and adoption  of  the Merger  Agreement  and  the
    transactions   contemplated  by  the  Merger   Agreement,  or  (4)  requires
    divestitures by Parent, Purchaser  or any other affiliate  of Parent of  any
    Shares; provided that Parent shall have used all reasonable efforts to cause
    any  such  decree, judgment,  injunction  or other  order  to be  vacated or
    lifted; or
 
       (C) the representations  and  warranties of  the  Company in  the  Merger
           Agreement  were untrue or incorrect in any material respect when made
    or (except for those that address matters  as of a specific date and  except
    for  changes  specifically  permitted by  the  Merger  Agreement) thereafter
    become and remain untrue or incorrect in any material respect; or
 
       (D) the Company shall have breached or  failed to comply in any  material
           respect  with any of its obligations  under the Merger Agreement and,
    with respect to any such breach or failure that can be remedied, the  breach
    or  failure is not remedied  within ten (10) business  days after Parent has
    furnished the Company written notice of such breach or failure; or
 
       (E) the Merger Agreement  shall have been  terminated in accordance  with
           its terms; or
 
       (F) the  Board  of  Directors  of the  Company  shall  have  withdrawn or
           materially  modified  or  changed  (including  by  amendment  of  the
    Schedule  14D-9) in a manner adverse  to Purchaser its recommendation of the
    Offer, the Merger Agreement or the Merger, or the Board of Directors of  the
    Company shall have approved or recommended an Acquisition Proposal; or
 
       (G) it  shall  have  been  publicly  disclosed  or  Purchaser  shall have
           otherwise learned that any person  or "group" (as defined in  section
    13(d)(3)  of the Exchange Act),  other than Parent or  its affiliates or any
    group of  which any  of them  is a  member, shall  have acquired  beneficial
    ownership (determined pursuant to Rule 13d-3 under the Exchange Act) of more
    than  25  percent  of the  Shares,  through  the acquisition  of  stock, the
    formation of a  group or otherwise,  or shall have  been granted an  option,
    right  or warrant, conditional or otherwise, to acquire beneficial ownership
    of more than 25 percent of the Shares; or
 
       (H) there shall have occurred and  continued for at least three  business
           days  (1) any  general suspension  of, or  limitation on  prices for,
    trading in  securities  on  any  national  securities  exchange  or  in  the
    over-the-counter  market in  the United States,  (2) the  declaration of any
    banking moratorium or any suspension of payments in respect of banks, or any
    limitation (whether  or not  mandatory) by  any governmental  entity on,  or
    other  event  materially adversely  affecting,  the extension  of  credit by
    lending institutions in the United States or  (3) in the case of any of  the
    foregoing  existing at the time of the commencement of the Offer, a material
    acceleration or worsening thereof,
 
which, in  the judgment  of  Parent in  any such  case,  and regardless  of  the
circumstances  (including any action or omission  by Parent or Purchaser) giving
rise to any such condition, makes it inadvisable to proceed with such acceptance
for payment or payments.
 
    The foregoing conditions are for the sole benefit of Parent, Merger Sub  and
their affiliates and may be asserted by either Parent or Purchaser regardless of
the  circumstances  (including, without  limitation, any  action or  inaction by
Parent, Purchaser or any of their affiliates) giving rise to any such  condition
or  may be waived by either Parent or  Purchaser, in whole or in part, from time
to time  in its  sole discretion,  except as  otherwise provided  in the  Merger
Agreement. The failure by Parent or Purchaser at any time to exercise any of the
foregoing  rights shall not be  deemed a waiver of any  such right and each such
right shall be deemed an ongoing right and may be asserted at any time and  from
time to time.
 
                                       32
<PAGE>
15.  CERTAIN LEGAL MATTERS
 
    Except  as  described in  this Section  15,  based on  a review  of publicly
available filings made  by the Company  with the Commission  and other  publicly
available  information  concerning  the  Company,  but  without  any independent
investigation,  neither  Purchaser  nor  Parent  is  aware  of  any  license  or
regulatory permit that appears to be material to the business of the Company and
its  subsidiaries,  taken  as  a  whole, that  might  be  adversely  affected by
Purchaser's acquisition of Shares as contemplated  in this Offer to Purchase  or
of  any approval  or other  action by any  governmental authority  that would be
required for the acquisition or ownership of Shares by Purchaser as contemplated
in this Offer to Purchase. Should any such approval or other action be required,
Purchaser and Parent presently  contemplate that such  approval or other  action
will  be sought, except  as described below under  "State Takeover Laws." While,
except as otherwise expressly described in  this Section 15, Purchaser does  not
presently  intend to delay the  acceptance for payment of  or payment for Shares
tendered pursuant to the Offer pending the outcome of any such matter, there can
be no assurance  that any such  approval or  other action, if  needed, would  be
obtained or would be obtained without substantial conditions; or that failure to
obtain  any  such approval  or  other action  might  not result  in consequences
adverse to  the Company's  business;  or that  certain  parts of  the  Company's
business might not have to be disposed of if such approvals were not obtained or
other  actions were  not taken  in order  to obtain  any such  approval or other
action. If certain types of adverse action are taken with respect to the matters
discussed below, Purchaser could  decline to accept for  payment or pay for  any
Shares tendered. See Section 14 above for certain conditions to the Offer.
 
    STATE  TAKEOVER LAWS.  A number of  states throughout the United States have
enacted takeover statutes that purport, in varying degrees, to be applicable  to
attempts  to acquire  securities of corporations  that are  incorporated or have
assets, shareholders, executive offices or  places of business in those  states.
In  EDGAR V. MITE  CORP., the Supreme Court  of the United  States held that the
Illinois Business Takeover Act, which  involved state securities laws that  made
the  takeover  of certain  corporations  more difficult,  imposed  a substantial
burden on interstate commerce and  therefore was unconstitutional. In CTS  CORP.
V.  DYNAMICS CORP. OF AMERICA,  however, the Supreme Court  of the United States
held that a state may,  as a matter of corporate  law and, in particular,  those
laws  concerning corporate  governance, constitutionally  disqualify a potential
acquiror from  voting on  the  affairs of  a  target corporation  without  prior
approval  of the remaining shareholders, provided  that the laws were applicable
only under certain conditions.
 
    The  FBCA   contains  certain   provisions   relating  to   an   "affiliated
transaction."  Such a  transaction includes any  merger of a  corporation into a
person who  is the  beneficial  owner of  more than  ten  percent (10%)  of  the
outstanding  voting shares of the corporation (an "Interested Shareholder"). The
FBCA requires  that,  unless certain  exceptions  are met,  the  transaction  be
approved by the holders of two-thirds of the voting shares other than the shares
owned by the Interested Shareholder and where the transaction is approved by the
holders  of two-thirds of the  voting shares other than  the shares owned by the
Interested Shareholder and where the transaction has been approved by a majority
of the corporation's  directors who are  not affiliated or  associated with  the
Interested  Shareholder.  The Company's  Board of  Directors,  none of  whom are
affiliated or associated with the Purchaser  or Parent, has approved the  Merger
Agreement and the Purchaser's acquisition of Shares pursuant to the Offer.
 
    The  FBCA  also contains  provisions  relating to  acquisitions  of "control
shares," which are defined as shares that entitle a person to exercise more than
specified proportions of the voting power of a corporation. The voting rights of
such shares  are  limited  if  they  have been  obtained  in  certain  types  of
acquisition  (a  "control-share acquisition").  The  FBCA expressly  excludes an
acquisition of shares  of a public  corporation where the  acquisition has  been
approved  by the board of directors of  such corporation. The Company's Board of
Directors has approved the Merger  Agreement and the Purchaser's acquisition  of
Shares pursuant to the Offer.
 
                                       33
<PAGE>
    Based   on   information  supplied   by  the   Company  and   the  Company's
representations and warranties contained in the Merger Agreement, the  Purchaser
does  not believe that, other than as set out above, any state takeover statutes
purport to apply to the  Offer or the Merger.  Neither the Purchaser nor  Parent
has  currently  complied  with any  state  takeover statute  or  regulation. The
Purchaser reserves the right to challenge  the applicability or validity of  any
state  law purportedly applicable to the Offer or the Merger and nothing in this
Offer to Purchase or any action takes in connection with the Offer or the Merger
is intended as a waiver of such right. If it is asserted that any state takeover
statute is applicable to the Offer or  the Merger and an appropriate court  does
not  determine that it is inapplicable or invalid as applies to the Offer or the
Merger, the Purchaser might be required to file certain information with, or  to
receive  approvals from, the relevant state authorities, and the Purchaser might
be unable to  accept for  payment as  pay for  Shares tendered  pursuant to  the
Offer,  or be delayed in consummating the Offer or the Merger. In such case, the
Purchaser may not be obliged  to accept payment or  pay for any Shares  tendered
pursuant to the Offer.
 
    ANTITRUST.   The  FTC and the  Antitrust Division  frequently scrutinize the
legality under the antitrust laws  of transactions such as Purchaser's  proposed
acquisition  of the Company. At any time before or after Purchaser's purchase of
Shares pursuant to the Offer, the Antitrust Division or the FTC could take  such
action under the antitrust laws as it deems necessary or desirable in the public
interest,  including seeking  to enjoin the  purchase of Shares  pursuant to the
Offer or the  consummation of the  Merger or seeking  the divestiture of  Shares
acquired  by Purchaser or the divestiture  of substantial assets of Purchaser or
its subsidiaries, or the Company or  its subsidiaries. Private parties may  also
bring  legal action under the antitrust  laws under certain circumstances. There
can be no assurance that a challenge to the Offer on antitrust grounds will  not
be made or, if such a challenge is made, of the result of that challenge.
 
16.  FEES AND EXPENSES
 
    Lazard  Freres is acting as Dealer Manager  in connection with the Offer and
has provided certain financial  advisory services to  Parent in connection  with
the  proposed acquisition  of the  Company. In  consideration of  the foregoing,
Parent has agreed to pay Lazard Freres a fee of $1,000,000.
 
    Purchaser has retained Morrow & Co.,  Inc. to act as the Information  Agent,
and The Chase Manhattan Bank (National Association) to act as the Depositary, in
connection  with the Offer.  The Information Agent and  the Depositary each will
receive  reasonable  and  customary  compensation  for  its  services,  will  be
reimbursed for certain reasonable out-of-pocket expenses and will be indemnified
against  certain  liabilities and  expenses  in connection  therewith, including
certain liabilities under the federal securities laws.
 
    Except as set forth above, Purchaser will not pay any fees or commissions to
any broker or dealer or other  person for soliciting tenders of Shares  pursuant
to  the Offer.  Brokers, dealers, commercial  banks and trust  companies will be
reimbursed by Purchaser for customary mailing and handling expenses incurred  by
them in forwarding the offering materials to their customers.
 
17.  MISCELLANEOUS
 
    The  Offer is  not being made  to (nor will  tenders be accepted  from or on
behalf of) holders of Shares residing in any jurisdiction in which the making of
the Offer  or  the  acceptance thereof  would  not  be in  compliance  with  the
securities,  blue sky or other laws of the jurisdiction. However, Purchaser may,
in its discretion, take such action as  it may deem necessary to make the  Offer
in  any  jurisdiction  and  extend  the  Offer  to  holders  of  Shares  in that
jurisdiction. In any jurisdiction where the  securities, blue sky or other  laws
require  the Offer to be made by a  licensed broker or dealer, the Offer will be
deemed to be made on  behalf of Purchaser by one  or more registered brokers  or
dealers that are licensed under the laws of the jurisdiction.
 
    Purchaser  has filed with the Commission the Schedule 14D-1 pursuant to Rule
14d-1 under  the Exchange  Act containing  certain additional  information  with
respect to the Offer. The Schedule and
 
                                       34
<PAGE>
any  amendments to the Schedule, including  exhibits, may be examined and copies
may be obtained from the  principal office of the  Commission in the manner  set
forth in Section 8 above (except that they will not be available at the regional
offices of the Commission).
 
    NO  PERSON  HAS  BEEN  AUTHORIZED  TO  GIVE  ANY  INFORMATION  OR  MAKE  ANY
REPRESENTATION ON BEHALF OF PURCHASER NOT CONTAINED IN THE OFFER TO PURCHASE  OR
IN  THE  LETTER  OF  TRANSMITTAL  AND, IF  GIVEN  OR  MADE,  THE  INFORMATION OR
REPRESENTATION MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED.
 
                                          HPG ACQUISITION CORP.
 
April 17, 1996
 
                                       35
<PAGE>
                                                                      SCHEDULE I
 
            DIRECTORS AND EXECUTIVE OFFICERS OF PURCHASER AND PARENT
 
A.  DIRECTORS AND EXECUTIVE OFFICERS OF PURCHASER
 
    The  following table  sets forth the  name, present  principal occupation or
employment and material  occupation, positions,  offices or  employment for  the
past  five years  of each  director and  executive officer  of Purchaser. Unless
otherwise indicated below, the business address of each such person is 235  East
42nd  Street, New York, New York 10017-5755 and each such person is a citizen of
the United States.
 
<TABLE>
<CAPTION>
         NAME AND                                       PRESENT PRINCIPAL OCCUPATION OR
     BUSINESS ADDRESS                             EMPLOYMENT AND FIVE-YEAR EMPLOYMENT HISTORY
- ---------------------------  -------------------------------------------------------------------------------------
<S>                          <C>
George A. Stewart*           President (January  1996-Present).  President  of the  Medical  Devices  Division  of
                             Parent's   Hospital  Products   Group  (1995-Present);   President,  Valleylab,  Inc.
                             (1993-1995); President,  Schneider  Worldwide  (1992-1993);  President,  Shiley  Inc.
                             (1991-1992).
Robert C. Ross               Director  (January 1996-Present);  Treasurer, Vice President  and Assistant Secretary
                             (January 1996-Present). Senior Assistant General Counsel of Parent (1987-Present).
William E. Rhodes, III       Director (January  1996-Present); Vice  President (January  1996-Present).  Director,
                             Business  Development and Technology  Assessment of Parent's  Hospital Products Group
                             (1993-Present);  President  of  The  William-James  Co.  Biomedical  Consulting  Firm
                             (1983-1993).
Dorothy Bonner Burke         Director (January 1996-Present); Secretary and Vice President (January 1996-Present).
                             Assistant General Counsel of Parent (1990-Present).
</TABLE>
 
B.  DIRECTORS AND EXECUTIVE OFFICERS OF PARENT
 
    The  following table  sets forth the  name, present  principal occupation or
employment and material  occupations, positions, offices  or employment for  the
past  five  years  of each  director  and  executive officer  of  Parent. Unless
otherwise indicated below, the business address of each such person is 235  East
42nd  Street, New York, New York 10017-5755 and each such person is a citizen of
the United States.
 
<TABLE>
<CAPTION>
          NAME AND                                      PRESENT PRINCIPAL OCCUPATION OR
      BUSINESS ADDRESS                            EMPLOYMENT AND FIVE-YEAR EMPLOYMENT HISTORY
- ----------------------------  ------------------------------------------------------------------------------------
<S>                           <C>
William C. Steere, Jr.        Director (1987-Present); Chairman of the Board (March 1992-Present); Chief Executive
                              Officer (April 1991-Present); Chair of  the Executive Committee. Formerly  President
                              (1991-1992);   Senior  Vice  President   (1989-1991);  Vice  President  (1983-1989);
                              President -- Pharmaceuticals Group (1986-1991). Director of the Federal Reserve Bank
                              of New York, Mineral Technologies  Inc., Pharmaceuticals Research and  Manufacturers
                              of America (PhRMA) and Texaco, Inc. Member of The Business Round Table.
Grace J. Fippinger            Director  (1976-Present); Member of the Executive Committee; Member of the Corporate
                              Governance Committee. Vice President, Secretary and Treasurer of NYNEX  Corporation,
                              an  exchange telecommunications  and exchange  access services  company (1984-1990).
                              Director of the Bear Stearns Companies, Inc.
</TABLE>
 
- ------------------------
*   Mr. Stewart is a citizen of Canada.
 
                                      I-1
<PAGE>
<TABLE>
<CAPTION>
          NAME AND                                      PRESENT PRINCIPAL OCCUPATION OR
      BUSINESS ADDRESS                            EMPLOYMENT AND FIVE-YEAR EMPLOYMENT HISTORY
- ----------------------------  ------------------------------------------------------------------------------------
James T. Lynn                 Director (1979-Present); Member of the Corporate Governance Committee; Chair of that
                              Committee (1986 through January  1995). Senior Advisor to  Lazard Freres & Co.  LLC,
                              Investment  Bankers (1992-Present);  Chairman and  Chief Executive  Officer of Aetna
                              Life and Casualty Company (1984-1992) and Director (1979-1992). Director of TRW Inc.
<S>                           <C>
Paul A. Marks                 Director (1978-Present); Chair of the Corporate Governance Committee; member of  the
                              Executive   Committee.   President   and  Chief   Executive   Officer   of  Memorial
                              Sloan-Kettering Cancer Center, a private  health care institution devoted to  cancer
                              prevention, patient care, research and education (1980-Present). Director of several
                              Dreyfus Mutual Funds, Life Technologies, Inc. and Tularik Inc.
Edmund T. Pratt, Jr.          Director  (1969-Present);  Member  of  the  Executive  Committee;  Chairman Emeritus
                              (1992-Present);  Chairman  of  the   Board  (1972-1992);  Chief  Executive   Officer
                              (1972-April  1991). Director of The Chase  Manhattan Bank, N.A., The Chase Manhattan
                              Corporation, General Motors Corporation, International Paper Company, AEA  Investors
                              Inc., Hughes Electronics Corporation and Minerals Technologies, Inc.
Felix G. Rohatyn              Director  (1971-Present); Member  of the  Executive Committee;  Member of  the Audit
                              Committee. Managing  Director  of  Lazard  Freres  &  Co.  LLC,  Investment  Bankers
                              (1960-Present);  Director of General Instrument  Corporation; Former Chairman of the
                              Municipal Assistance Corporation for the City of New York (1975-1993).
Constance J. Horner           Director (1993-Present); Member of the Corporate Governance Committee. Guest Scholar
                              at The  Brookings  Institution, an  organization  devoted to  nonpartisan  research,
                              education and publication in economics, government and foreign policy and the social
                              sciences   (1993-Present);   Commissioner,   U.S.   Commission   on   Civil   Rights
                              (1993-Present); Served  at the  White House  as Assistant  to the  President and  as
                              Director  of Presidential  Personnel (August  1991-January 1993);  Deputy Secretary,
                              U.S. Department  of Health  and Human  Services (1989-1991);  Director of  the  U.S.
                              Office  of  Personnel Management  (1985-1989).  Director of  Ingersoll-Rand  and The
                              Prudential Insurance Co. of America.
Thomas G. Labrecque           Director (1993-Present); Member of  the Executive Compensation Committee.  President
                              and  Chief Operating Officer  and a Director  of The Chase  Manhattan Corporation, a
                              bank holding company, and The  Chase Manhattan Bank, N.A. (1990-Present);  President
                              of  The Chase Manhattan Corporation and  The Chase Manhattan Bank, N.A. (1981-1990);
                              Member of the Business Roundtable, the Council on Foreign Relations, the Council  on
                              Competitiveness  and the Trilateral Commission;  President of The Bankers Roundtable
                              and the International Monetary Conference.
Jean-Paul Valles              Director (1980-Present).  Chairman of  Minerals Technologies  Inc., a  resource  and
                              technology-based  company  that develops,  produces  and markets  specialty mineral,
                              mineral-based and  synthetic mineral  products (1989-Present),  and Chief  Executive
                              Officer  of  Minerals Technologies  Inc. (1992-Present).  Formerly Vice  Chairman of
                              Parent (March-October  1992);  Executive  Vice President  (1991-1992);  Senior  Vice
                              President  (1989-1991); Senior Vice President -- Finance (1989-1990); Vice President
                              -- Finance (1980-1989).
</TABLE>
 
                                      I-2
<PAGE>
<TABLE>
<CAPTION>
          NAME AND                                      PRESENT PRINCIPAL OCCUPATION OR
      BUSINESS ADDRESS                            EMPLOYMENT AND FIVE-YEAR EMPLOYMENT HISTORY
- ----------------------------  ------------------------------------------------------------------------------------
M. Anthony Burns              Director (1988-Present); Chair of the Executive Compensation Committee. Chairman  of
                              the  Board  (1985-Present), Chief  Executive  Officer (1983-Present),  President and
                              Director (1979-Present)  of Ryder  System, Inc.,  a provider  of transportation  and
                              logistics  services  in  the Americas  and  Western  Europe. Director  of  The Chase
                              Manhattan Bank, N.A., The Chase Manhattan  Corporation and J.C. Penney Company  Inc.
                              Member of the Business Roundtable and the Business Roundtable's Policy Committee and
                              Chairman of its Health, Welfare and Retirement Income Task Force.
<S>                           <C>
George B. Harvey              Director  (1994-Present); Member of the  Executive Compensation Committee. Chairman,
                              President, and Chief Executive Officer (1983-Present) and Director (1980-Present) of
                              Pitney Bowes, a provider of mailing and office systems and management and  financial
                              services.  Director of Connecticut Mutual  Life Insurance Company, McGraw-Hill, Inc.
                              and Merrill Lynch & Co., Inc.
Stanley O. Ikenberry          Director (1982-Present); Chair of the Audit Committee. President Emeritus and Regent
                              Professor of the University of Illinois, a comprehensive public research  university
                              with  campuses at Urbana-Champaign and Chicago; Formerly President of the University
                              (1979-July 1995). Director of Harris Bank, Utilicorp United Inc. and the Chairman of
                              the Board of the Carnegie Foundation for the Advancement of Teaching.
Franklin D. Raines            Director of the Company (1993-Present); Member of the Audit Committee. Vice Chairman
                              of the Federal National Mortgage Association (Fannie Mae), a company that provides a
                              secondary market for residential mortgages through portfolio purchases, issuance  of
                              mortgage-backed  securities and  other services  (1991-Present); General  Partner in
                              municipal finance  at  the  investment banking  firm  of  Lazard Freres  &  Co.  LLC
                              (1985-1990). Director of Fannie Mae and The Boeing Company.
Brian W. Barrett*             President  -- Animal Health Group (April 1996 -- Present); Executive Vice President,
                              International  Pharmaceuticals  Group  (January  1996-April  1996);  Vice  President
                              (1992-Present);  President, Northern  Asia, Australasia and  Canada -- International
                              Pharmaceuticals Group (1993-1995); President  Asia/Canada (1991-1993); President  --
                              Africa/ Middle East (1985-1991).
</TABLE>
 
<TABLE>
<S>                      <C>
M. Kenneth Bowler        Vice President -- Federal Government Relations (1990-Present).
C.L. Clemente            Senior Vice President -- Corporate Affairs; Secretary and Corporate
                         Counsel   (1992-Present);  Member   of  the   Corporate  Management
                         Committee  (1991-Present);  Vice  President;  General  Counsel  and
                         Secretary (1986-1992).
Bruce R. Ellig           Vice  President --  Employee Resources (formerly  Vice President --
                         Personnel Relations) (1985-Present).
Donald F. Farley         President of the Consumer Health Care Group (January 1996-Present);
                         Vice President (1993-Present); President of the Food Science  Group
                         (1992-1995);   Executive  Vice  President   -  Specialty  Chemicals
                         (1988-1992).
</TABLE>
 
- ------------------------
*   Mr. Barrett is a citizen of Canada.
 
                                      I-3
<PAGE>
<TABLE>
<CAPTION>
       NAME AND                            PRESENT PRINCIPAL OCCUPATION OR
   BUSINESS ADDRESS                  EMPLOYMENT AND FIVE-YEAR EMPLOYMENT HISTORY
- -----------------------  -------------------------------------------------------------------
George A. Forcier             Vice President  --  Quality  Control  (1994-Present);  Group  Director  (1991-1994);
                              Director of the Analytical Research and Development Department (1986-1991).
<S>                      <C>                                                                  <C>
P. Nigel Gray*                President  of  the  Hospital  Products  Group  (July  1995-Present);  Vice President
                              (1994-Present);  Executive  Vice  President   of  the  Hospital  Products   Division
                              (1993-1995);  President of  the Medical  Devices Division  (1993-1995); President of
                              Howmedica International (1992-1993);  Senior Vice President  and General Manager  of
                              Howmedica International (1987-1992).
Gary N. Jortner               Vice  President; Group  Vice President,  Disease Management  -- U.S. Pharmaceuticals
                              Group (1994-Present);  Vice President  (1992-Present);  Vice President  and  General
                              Manager,  Pfizer Labs Division (1991-1994); Vice  President of Operations for Pfizer
                              Labs (1986-1991).
</TABLE>
 
<TABLE>
<S>                      <C>
Karen L. Katen           President of the U.S. Pharmaceuticals Group (August  1995-Present);
                         Vice President (1992-Present); Executive Vice President of the U.S.
                         Pharmaceuticals  Group  (1993-1995);  Vice  President  and  General
                         Manager - Roerig Division (1986-1993).
Alan G. Levin            Treasurer (January 1995-Present); Senior Director -- Finance,  Asia
                         (1993-1994);  Director -- Finance,  Asia (1991-1993); Controller of
                         the Pfizer International Bank in San Juan, Puerto Rico (1988-1991).
Henry A. McKinnell*      Executive  Vice  President  (1992-Present);  Responsible  for  U.S.
                         Pharmaceuticals  Group,  Consumer  Health  Care  Group,  Corporate;
                         Finance  Division  and  Corporate  Strategic  Planning  and  Policy
                         (1995-Present);   Member  of  the  Corporate  Management  Committee
                         (1992-Present);  President   of   the   Hospital   Products   Group
                         (1992-1995);  Chief Financial Officer (1990-1995); Vice President -
                         Finance (1990-1992). Director of Ariall, Inc.
Brower A. Merriam        Vice President --  Animal Health  Policy (April  1996 to  Present);
                         President  of  the  Animal  Health  Group  (1992-April  1996); Vice
                         President (1992-Present); Executive  Vice President  of the  Animal
                         Health  Group  (1991-1992);  Executive  Vice  President  of  Pfizer
                         International (1990-1991).
Victor P. Micati         Executive  Vice  President,  International  Pharmaceuticals   Group
                         (January  1996-Present); Vice  President (1992-Present); President,
                         Europe (1990-1995).
Paul S. Miller           Senior Vice President;  General Counsel  (1992-Present); Member  of
                         the  Corporate Management Committee (1991-Present); Vice President;
                         General Counsel (1986-1992).
George M. Milne, Jr.     President,  Central   Research   (1993-Present);   Vice   President
                         (1993-Present);  Senior  Vice President,  Research  and Development
                         (1988-1993).
</TABLE>
 
- ------------------------
*   Mr. Gray is a citizen of the  United Kingdom. Mr. McKinnell is a citizen  of
    Canada.
 
                                      I-4
<PAGE>
<TABLE>
<CAPTION>
       NAME AND                            PRESENT PRINCIPAL OCCUPATION OR
   BUSINESS ADDRESS                  EMPLOYMENT AND FIVE-YEAR EMPLOYMENT HISTORY
- -----------------------  -------------------------------------------------------------------
<S>                      <C>                                                                  <C>
Robert Neimeth                President,  International  Pharmaceuticals  Group  (1992-Present);  Responsible  for
                              International  Pharmaceutical  and  Animal  Health  operations  (1992-Present)   and
                              Hospital  Products  Group (1995-Present);  Executive Vice  President (1992-Present);
                              Member of the Corporate Management Committee (1991-Present); Chairman, President and
                              Chief Executive  Officer  of  Pfizer International  (1991-1992);  President,  Pfizer
                              International Subsidiaries (1990-1991).
John F. Niblack               Executive  Vice President -- Research and  Development (1993-Present); Member of the
                              Corporate  Management  Committee  (1993-Present);  Vice  President   (1990-Present);
                              President Central Research (1990-1993).
William J. Robison            Senior  Vice President  -- Employee  Resources (January  1996-Present); President of
                              Consumer Health Care Group (1992-1995);  Vice President (1992-1995); Vice  President
                              and General Manager of Pratt Pharmaceuticals (1990-1992).
Herbert V. Ryan               Controller (1993-Present); Assistant Controller, Corporate Accounting (1981-1993).
Craig Saxton                  Executive  Vice  President  -  Central  Research  (1993-President);  Vice  President
                              (1993-President); Senior Vice President, Clinical  Research and Development for  the
                              Central Research Division (1988-1993).
David L. Shedlarz             Chief    Financial   Officer    (August   1995-Present);    Vice   President-Finance
                              (1992-Present); Vice President of Finance for the Pharmaceuticals Group (1989-1992).
Frederick W. Telling          Vice President, Corporate Strategic Planning and Policy (1994-Present); Senior  Vice
                              President  of Planning  and Policy for  the U.S. Pharmaceuticals  Group (1994); Vice
                              President of Planning and Policy for the U.S. Pharmaceuticals Group (1987-1994).
</TABLE>
 
                                      I-5
<PAGE>
    Facsimile copies of the Letter  of Transmittal, properly completed and  duly
signed, will be accepted. The Letter of Transmittal, certificates for Shares and
any  other required documents should be sent or delivered by each shareholder of
the Company  or his  broker, dealer,  commercial bank,  trust company  or  other
nominee to the Depository, at one of the addresses set forth below:
 
                        THE DEPOSITARY FOR THE OFFER IS:
 
                THE CHASE MANHATTAN BANK (National Association)
 
<TABLE>
<S>                        <C>                           <C>
        BY MAIL:              BY OVERNIGHT DELIVERY:                BY HAND:
        Box 3032               c/o Chase Securities          (9.00 a.m. - 5:00 p.m.
4 Chase MetroTech Center         Processing Corp.             New York City Time)
   Brooklyn, NY 11245         Ft. Lee Executive Park        1 Chase Manhattan Plaza
                              1 Executive Drive (6th               Floor 1-B
                                      Floor)               Nassau and Liberty Streets
                                Ft. Lee, NJ 07024              New York, NY 10081
                            By Facsimile Transmission
                                  (201) 592-4372
                             Information and Confirm
                                   by Telephone
                                  (201) 592-4370
</TABLE>
 
    Questions  and requests  for assistance may  be directed  to the Information
Agent or the Dealer Manager at their respective addresses and telephone  numbers
listed  below.  Additional  copies of  this  Offer  to Purchase,  the  Letter of
Transmittal  and  other  tender  offer  materials  may  be  obtained  from   the
Information  Agent  as  set  forth  below  and  will  be  furnished  promptly at
Purchaser's expense. You may also contact your broker, dealer, commercial  bank,
trust company or other nominee for assistance concerning the Offer.
 
                    THE INFORMATION AGENT FOR THE OFFER IS:
 
                               MORROW & CO., INC.
                                909 Third Avenue
                                   20th Floor
                            New York, New York 10022
                                 (212) 754-8000
                            Toll Free (800) 566-9061
 
                   Brokers and Brokerage firms, please call:
                                 (800) 662-5200
 
                      THE DEALER MANAGER FOR THE OFFER IS:
 
                            LAZARD FRERES & CO. LLC
 
                              30 Rockefeller Plaza
                            New York, New York 10020
                          (Call Collect) 212-632-6717

<PAGE>
                             LETTER OF TRANSMITTAL
                        TO TENDER SHARES OF COMMON STOCK
                                       OF
                              CORVITA CORPORATION
             PURSUANT TO THE OFFER TO PURCHASE DATED APRIL 17, 1996
                                       BY
                             HPG ACQUISITION CORP.
                      A DIRECT WHOLLY-OWNED SUBSIDIARY OF
                                  PFIZER INC.
 
         THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT,
  NEW YORK CITY TIME, ON TUESDAY, MAY 14, 1996, UNLESS THE OFFER IS EXTENDED.
 
                         THE DEPOSITARY FOR THE OFFER:
 
                THE CHASE MANHATTAN BANK (NATIONAL ASSOCIATION)
 
<TABLE>
<S>                                  <C>                                <C>
             BY MAIL:                     BY OVERNIGHT DELIVERY:                     BY HAND:
             Box 3032                      c/o Chase Securities                (9:00 a.m.-5:00 p.m.
     4 Chase MetroTech Center                Processing Corp.                   New York City Time)
        Brooklyn, NY 11245                Fort Lee Executive Park             1 Chase Manhattan Plaza
                                       1 Executive Drive (6th Floor)                 Floor 1-B
                                            Fort Lee, NJ 07024              Nassau and Liberty Streets
                                         By Facsimile Transmission              New York, NY 10081
                                              (201) 592-4372
                                          Information and Confirm
                                               by Telephone
                                              (201) 592-4370
</TABLE>
 
    DELIVERY OF THIS LETTER OF TRANSMITTAL TO AN ADDRESS OTHER THAN AS SET FORTH
ABOVE  OR TRANSMISSION OF INSTRUCTIONS VIA  A FACSIMILE TRANSMISSION TO A NUMBER
OTHER THAN AS SET  FORTH ABOVE WILL  NOT CONSTITUTE A  VALID DELIVERY. YOU  MUST
SIGN THIS LETTER OF TRANSMITTAL IN THE APPROPRIATE SPACE THEREFOR PROVIDED BELOW
AND COMPLETE THE SUBSTITUTE FORM W-9 SET FORTH BELOW.
 
    THE  INSTRUCTIONS  ACCOMPANYING THIS  LETTER OF  TRANSMITTAL SHOULD  BE READ
CAREFULLY BEFORE THIS LETTER OF TRANSMITTAL IS COMPLETED.
 
    This Letter  of Transmittal  is to  be completed  by holders  of Shares  (as
defined  below)  of  Corvita Corporation  (the  "Shareholders")  if certificates
evidencing Shares  ("Certificates") are  to  be forwarded  with this  Letter  of
Transmittal  or if delivery of Shares is to be made by book-entry transfer to an
account maintained  by  The Chase  Manhattan  Bank (National  Association)  (the
"Depositary")  at The Depository  Trust Company ("DTC"),  the Midwest Securities
Trust Company ("MSTC")  or the  Philadelphia Depository  Trust Company  ("PDTC")
(each  a "Book-Entry Transfer Facility") pursuant to the procedures set forth in
Section 3 of the Offer to Purchase (as defined below).
 
    Shareholders whose Certificates are not immediately available or who  cannot
deliver  either their Certificates for, or a Book-Entry Confirmation (as defined
in Section 3 of  the Offer to  Purchase) with respect to,  their Shares and  all
other  required documents  to the  Depositary prior  to the  Expiration Date (as
defined in Section 1 of
<PAGE>
the Offer  to Purchase)  may tender  their Shares  according to  the  guaranteed
delivery  procedure  set  forth in  Section  3  of the  Offer  to  Purchase. See
Instruction 2 hereof. Delivery  of documents to  a Book-Entry Transfer  Facility
does not constitute delivery to the Depositary.
 
/ /  CHECK  HERE IF TENDERED  SHARES ARE BEING  DELIVERED BY BOOK-ENTRY TRANSFER
     MADE TO AN ACCOUNT MAINTAINED BY THE DEPOSITARY WITH A BOOK-ENTRY  TRANSFER
     FACILITY,  AND COMPLETE  THE FOLLOWING  (ONLY PARTICIPANTS  IN A BOOK-ENTRY
     TRANSFER FACILITY MAY DELIVER SHARES BY BOOK-ENTRY TRANSFER).
 
     Name of Tendering Institution: ____________________________________________
    Check Box of Book-Entry Transfer Facility:
 
     / / DTC            / / MSTC            / / PDTC
 
     Account Number: ___________________________________________________________
    Transaction Code Number: ___________________________________________________
 
/ /  CHECK HERE IF SHARES ARE BEING DELIVERED PURSUANT TO A NOTICE OF GUARANTEED
     DELIVERY PREVIOUSLY  SENT TO  THE DEPOSITARY  AND COMPLETE  THE  FOLLOWING.
     PLEASE ENCLOSE A PHOTOCOPY OF SUCH NOTICE OF GUARANTEED DELIVERY.
 
     Name(s) of Registered Holder(s): __________________________________________
    Window Ticket Number (if any): _____________________________________________
    Date of Execution of Notice of Guaranteed Delivery: ________________________
    Name of Institution Which Guaranteed Delivery: _____________________________
    If delivered by book-entry transfer, check box of Applicable Book-Entry
     Transfer Facility:
 
     / / DTC            / / MSTC            / / PDTC
 
     Account Number: ___________________________________________________________
    Transaction Code Number: ___________________________________________________
<TABLE>
<S>                                                         <C>              <C>              <C>
                                       DESCRIPTION OF SHARES TENDERED
 
<CAPTION>
                                                                                Number of
     Name(s) and Address(es) of Registered Holder(s)             Share           Shares          Number of
      (Please fill in, if blank, exactly as name(s)          Certificates    Represented by       Shares
             appear(s) on the Certificate(s))                Number(s)(1)    Certificate(s)(1)   Tendered(2)
<S>                                                         <C>              <C>              <C>
 
                                                             Total Shares
 (1) Need not be completed by Shareholders delivering Shares by Book-Entry Transfer.
 (2) Unless otherwise indicated, it will be assumed that all Shares represented by Certificates delivered to
     the Depositary are being tendered. See Instruction 4.
</TABLE>
 
<PAGE>
                   NOTE: SIGNATURE(S) MUST BE PROVIDED BELOW
              PLEASE READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY
 
Ladies and Gentlemen:
 
    The   undersigned  hereby  tenders  to  HPG  Acquisition  Corp.,  a  Florida
corporation and a direct wholly-owned  subsidiary of Pfizer Inc.  ("Purchaser"),
the  above-described shares of common stock,  $.001 par value (the "Shares"), of
Corvita Corporation,  a  Florida corporation  (the  "Company"), for  $10.25  per
Share,  net to the seller in cash, upon  the terms and subject to the conditions
set forth  in  the Offer  to  Purchase, dated  April  17, 1996  (the  "Offer  to
Purchase"),  receipt  of which  is hereby  acknowledged, and  in this  Letter of
Transmittal (which together constitute the "Offer"). The undersigned understands
that Purchaser reserves the right to transfer  or assign, in whole or from  time
to  time in part, to any newly formed direct or indirect wholly-owned subsidiary
of Purchaser, the right to  purchase all or any  portion of the Shares  tendered
pursuant  to the  Offer, but  any such transfer  or assignment  will not relieve
Purchaser of  its  obligations  under  the Offer  or  prejudice  the  rights  of
tendering  Shareholders  to  receive  payment for  Shares  validly  tendered and
accepted for payment pursuant to the Offer.
 
    Subject to, and effective upon, acceptance  for payment of, or payment  for,
Shares tendered with this Letter of Transmittal in accordance with the terms and
subject  to the conditions of the Offer  (including, if the Offer is extended or
amended, the  terms or  conditions  of any  such  extension or  amendment),  the
undersigned  hereby  sells, assigns  and  transfers to,  or  upon the  order of,
Purchaser all right, title  and interest in  and to all of  the Shares that  are
being tendered hereby and any and all other Shares or other securities issued or
issuable in respect of such Shares on or after April 17, 1996 (a "Distribution")
and  irrevocably constitutes  and appoints  the Depositary  the true  and lawful
agent and attorney-in-fact of the undersigned  with respect to such Shares  (and
any  Distributions), with  full power  of substitution  (such power  of attorney
being deemed  to be  an irrevocable  power  coupled with  an interest),  to  (i)
deliver Certificates evidencing such Shares (and any Distributions), or transfer
ownership of such Shares (and all Distributions) on the account books maintained
by  a  Book-Entry  Transfer  Facility  together,  in  any  such  case,  with all
accompanying evidences of transfer  and authenticity to, or  upon the order  of,
Purchaser,  upon receipt  by the Depositary  as the undersigned's  agent, of the
purchase price with respect  to such Shares, (ii)  present such Shares (and  any
Distributions)  for transfer on the  books of the Company  and (iii) receive all
benefits and  otherwise exercise  all  rights of  beneficial ownership  of  such
Shares  (and any Distributions), all in accordance with the terms and subject to
the conditions of the Offer.
 
    The undersigned hereby  irrevocably appoints each  designee of Purchaser  as
the  attorney-in-fact  and proxy  of the  undersigned, each  with full  power of
substitution, to the full extent of the undersigned's rights with respect to all
Shares tendered hereby and accepted for  payment and paid for by Purchaser  (and
any  Distributions), including without limitation, the right to vote such Shares
(and any Distributions) in such  manner as each such  attorney and proxy or  his
substitute  shall,  in his  sole  discretion, deem  proper.  All such  powers of
attorney and  proxies,  being deemed  to  be irrevocable,  shall  be  considered
coupled with an interest in the Shares tendered with this Letter of Transmittal.
Such  appointment will be effective when, and only to the extent that, Purchaser
accepts such Shares  for payment. Upon  such acceptance for  payment, all  prior
powers  of attorney and  proxies given by  the undersigned with  respect to such
Shares (and any Distributions) will be  revoked, without further action, and  no
subsequent  powers of  attorneys and proxies  may be given  with respect thereto
(and, if given, will  be deemed ineffective). The  designees of Purchaser  will,
with respect to the Shares (and any Distributions) for which such appointment is
effective,  be  empowered  to  exercise  all  voting  and  other  rights  of the
undersigned with respect to such Shares (and any Distributions) as they in their
sole discretion  may  deem proper.  Purchaser  reserves the  absolute  right  to
require  that, in  order for Shares  to be deemed  validly tendered, immediately
upon the acceptance for payment of  such Shares, Purchaser or its designees  are
able  to  exercise full  voting  rights with  respect  to such  Shares  (and any
Distributions), including voting at any meeting of Shareholders then scheduled.
 
    All authority  conferred  or  agreed  to be  conferred  in  this  Letter  of
Transmittal  shall be  binding upon  the successors,  assigns, heirs, executors,
administrators and legal  representatives of  the undersigned and  shall not  be
affected  by, and  shall survive,  the death  or incapacity  of the undersigned.
Except as stated in the Offer to Purchase, this tender is irrevocable.
 
    The undersigned hereby represents and warrants that the undersigned has full
power and authority  to tender, sell,  assign and transfer  the Shares  tendered
hereby  (and any Distributions) and that, when the same are accepted for payment
and  paid  for  by  Purchaser,  Purchaser  will  acquire  good,  marketable  and
unencumbered  title thereto, free and clear  of all liens, restrictions, charges
and encumbrances, and that  the Shares tendered  hereby (and any  Distributions)
will  not be subject to  any adverse claim. The  undersigned, upon request, will
<PAGE>
execute and  deliver  any  additional  documents deemed  by  the  Depositary  or
Purchaser  to be  necessary or  desirable to  complete the  sale, assignment and
transfer of Shares  tendered hereby  (and any Distributions).  In addition,  the
undersigned  shall promptly remit and transfer to the Depositary for the account
of Purchaser any  and all Distributions  issued to the  undersigned on or  after
April  17,  1996  in  respect  of the  Shares  tendered  hereby,  accompanied by
appropriate documentation of transfer, and pending such remittance and  transfer
or  appropriate assurance thereof, Purchaser shall be entitled to all rights and
privileges as  owner of  any  such Distributions  and  may withhold  the  entire
purchase price or deduct from the purchase price the amount of value thereof, as
determined by Purchaser in its sole discretion.
 
    The  undersigned understands that the valid tender of Shares pursuant to any
one of the procedures described in Section 3 of the Offer to Purchase and in the
instructions to this Letter of  Transmittal will constitute a binding  agreement
between the undersigned and Purchaser with respect to such Shares upon the terms
and subject to the conditions of the Offer.
 
    The  undersigned recognizes that,  under certain circumstances  set forth in
the Offer to Purchase, Purchaser may not  be required to accept for payment  any
of  the Shares tendered hereby  or may accept for payment  fewer than all of the
Shares tendered hereby.
 
    Unless otherwise  indicated in  this Letter  of Transmittal  under  "Special
Payment  Instructions," please issue the check for the purchase price and return
any Certificates evidencing Shares not tendered  or not accepted for payment  in
the  name(s) of the registered holder(s)  appearing under "Description of Shares
Tendered."  Similarly,  unless  otherwise  indicated  under  "Special   Delivery
Instructions,"  please  mail the  check for  the purchase  price and  return any
Certificates evidencing Shares  not tendered  or not accepted  for payment  (and
accompanying  documents, as  appropriate) to  the address(es)  of the registered
holder(s) appearing under "Description  of Shares Tendered."  In the event  that
both  the "Special Payment Instructions" and the "Special Delivery Instructions"
are completed, please issue the check for the purchase price and return any such
Certificates evidencing Shares  not tendered  or not accepted  for payment  (and
accompanying  documents, as  appropriate) in  the name(s)  of, and  deliver such
check and return such Certificates (and accompanying documents, as  appropriate)
to  the person(s)  so indicated.  Unless otherwise  indicated in  this Letter of
Transmittal under "Special Payment  Instructions," in the  case of a  book-entry
delivery  of  Shares, please  credit the  account  maintained at  the Book-Entry
Facility indicated above with  respect to any Shares  not accepted for  payment.
The  undersigned recognizes  that Purchaser  has no  obligation pursuant  to the
"Special Payment  Instructions" to  transfer any  Shares from  the name  of  the
registered  holder if Purchaser  does not accept  for payment any  of the Shares
tendered hereby.
<PAGE>
/ /  CHECK HERE IF ANY OF THE CERTIFICATES REPRESENTING SHARES THAT YOU OWN HAVE
     BEEN LOST OR DESTROYED AND SEE INSTRUCTION 11.
 
Number  of  Shares   represented  by   the  lost   or  destroyed   certificates:
____________________________________________________________________
 
<TABLE>
<S>                                           <C>
        SPECIAL PAYMENT INSTRUCTIONS                 SPECIAL DELIVERY INSTRUCTIONS
      (SEE INSTRUCTIONS 1, 5, 6 AND 7)              (SEE INSTRUCTIONS 1, 5, 6 AND 7)
    TO BE COMPLETED ONLY IF CERTIFICATES FOR  TO  BE  COMPLETED ONLY  IF  CERTIFICATES FOR
SHARES NOT  TENDERED  OR  NOT  ACCEPTED  FOR  SHARES  NOT  TENDERED  OR  NOT  ACCEPTED FOR
PAYMENT AND/OR  THE CHECK  FOR THE  PURCHASE  PAYMENT AND THE CHECK FOR THE PURCHASE PRICE
PRICE  OF SHARES ACCEPTED FOR PAYMENT ARE TO  OF SHARES  ACCEPTED FOR  PAYMENT ARE  TO  BE
BE  ISSUED IN THE NAME OF SOMEONE OTHER THAN  SENT TO SOMEONE  OTHER THAN THE  UNDERSIGNED
THE  UNDERSIGNED, OR IF  SHARES DELIVERED BY  OR TO THE  UNDERSIGNED AT  AN ADDRESS  OTHER
BOOK-ENTRY  TRANSFER  THAT ARE  NOT ACCEPTED  THAN THAT SHOWN ABOVE.
FOR PAYMENT ARE TO BE RETURNED BY CREDIT  TO
AN   ACCOUNT  MAINTAINED   AT  A  BOOK-ENTRY
TRANSFER FACILITY, OTHER THAN TO THE ACCOUNT
INDICATED ABOVE.
 
Issue Check/Certificate(s) to:                Mail Check/Certificate(s) to:
Name:                                         Name:
             (Please type or                  (Please type or Print)
Print)                                        Address:
Address:
                                              (Include Zip Code)
               (Include Zip
Code)                                         (Tax  Identification   or  Social   Security
                                              No.)
      (Tax Identification or Social Security
No.)
               (See Substitute Form
W-9)
 
Credit unpurchased Shares delivered by book-
entry  transfer  to the  Book-Entry Transfer
Facility account set forth below:
 
/ / DTC          / / MSTC          / /  PDTC
                (check one)
 
       (DTC/MSTC/PDTC Acount Number)
</TABLE>
<PAGE>
                                  INSTRUCTIONS
             FORMING PART OF THE TERMS AND CONDITIONS OF THE OFFER
 
    1.    GUARANTEE  OF SIGNATURES.    Except  as otherwise  provided  below, no
signature guarantee is required on this Letter of Transmittal (a) if this Letter
of Transmittal  is signed  by  the registered  holder(s)  (which term,  for  the
purposes  of this  document, includes any  participant in any  of the Book-Entry
Facilities' systems whose  name appears on  a security position  listing as  the
owner  of the Shares) of Shares tendered herewith and such registered holder has
not completed either the box entitled "Special Delivery Instructions" of the box
entitled "Special Payment Instructions" on this Letter of Transmittal or (b)  if
such  Shares are tendered for the  account of a financial institution (including
most commercial banks, savings and loan associations and brokerage houses)  that
is a participant in the Security Transfer Agents Medallion Program, the New York
Stock  Exchange  Medallion Signature  Guarantee  Program or  the  Stock Exchange
Medallion  Program  (an  "Eligible  Institution").  In  all  other  cases,   all
signatures  on  the Letter  of  Transmittal must  be  guaranteed by  an Eligible
Institution. See Instruction 5. If the  Certificates are registered in the  name
of  a person other than the signer of  this Letter of Transmittal, or if payment
is to be made or delivered to, or Certificates evidencing unpurchased Shares are
to be issued or returned to, a person other than the registered owner, then  the
tendered  Certificates must  be endorsed or  accompanied by  duly executed stock
powers, in either case  signed exactly as  the name or  names of the  registered
owner  or  owners  appear  on  the  Certificates,  with  the  signatures  on the
Certificates or stock powers guaranteed  by an Eligible Institution as  provided
in this Letter of Transmittal. See Instruction 5.
 
    2.   REQUIREMENTS OF TENDER.  This  Letter of Transmittal is to be completed
by Shareholders if Certificates evidencing Shares are to be forwarded with  this
Letter  of Transmittal or  if delivery of Shares  is to be  made pursuant to the
procedures for  book-entry transfer  set forth  in  Section 3  of the  Offer  to
Purchase.  For a  Shareholder to  validly tender  Shares pursuant  to the Offer,
either (a) a properly  completed and duly executed  Letter of Transmittal (or  a
manually signed facsimile), with any required signature guarantees and any other
required  documents, must be received by the  Depositary at one of its addresses
set forth in this Letter of Transmittal  on or prior to the Expiration Date  (as
defined  in  the Offer  to Purchase)  and either  (i) Certificates  for tendered
Shares must be received by the Depositary at one of those addresses on or  prior
to  the  Expiration  Date or  (ii)  Shares  must be  delivered  pursuant  to the
procedures for  book-entry transfer  set forth  in  Section 3  of the  Offer  to
Purchase  and a Book-Entry Confirmation must be received by the Depositary on or
prior to the Expiration Date or  (b) the tendering Shareholder must comply  with
the guaranteed delivery procedures set forth below and in Section 3 of the Offer
to Purchase.
 
    Shareholders  whose Certificates are not immediately available or who cannot
deliver their Certificates and all other required documents to the Depositary or
complete the procedures for  book-entry transfer on or  prior to the  Expiration
Date  may tender their Shares by properly completing and duly executing a Notice
of Guaranteed Delivery pursuant to the guaranteed delivery procedures set  forth
in  Section 3 of the  Offer to Purchase. Pursuant  to such procedure: (i) tender
must be made by  or through an Eligible  Institution, (ii) a properly  completed
and  duly executed Notice of Guaranteed Delivery, substantially in the form made
available by  Purchaser,  must  be  received by  the  Depositary  prior  to  the
Expiration  Date,  and (iii)  Certificates representing  all tendered  Shares in
proper form for transfer, or a  Book-Entry Confirmation with respect to all  the
tendered  Shares, together  with a Letter  of Transmittal (or  a manually signed
facsimile), properly completed  and duly executed,  with any required  signature
guarantees  or  an Agent's  Message (as  defined in  Section 2  of the  Offer to
Purchase) in  connection with  a  book-entry transfer  and any  other  documents
required  by  this Letter  of Transmittal,  must be  received by  the Depositary
within three NASDAQ Small-Cap Market trading days after the date of such  Notice
of  Guaranteed  Delivery.  If  Certificates  are  forwarded  separately  to  the
Depositary, a properly completed and duly  executed Letter of Transmittal (or  a
manually signed facsimile) must accompany each delivery.
 
    THE  METHOD OF DELIVERY OF CERTIFICATES,  THIS LETTER OF TRANSMITTAL AND ANY
OTHER REQUIRED  DOCUMENTS, IS  AT THE  OPTION  AND SOLE  RISK OF  THE  TENDERING
SHAREHOLDER  AND THE DELIVERY WILL BE DEEMED MADE ONLY WHEN ACTUALLY RECEIVED BY
THE DEPOSITARY. IF  DELIVERY IS  BY MAIL,  REGISTERED MAIL  WITH RETURN  RECEIPT
REQUESTED,  PROPERLY  INSURED, IS  RECOMMENDED.  IN ALL  CASES,  SUFFICIENT TIME
SHOULD BE ALLOWED TO ENSURE TIMELY DELIVERY.
<PAGE>
    No alternative, conditional or  contingent tenders will  be accepted and  no
fractional Shares will be purchased. All tendering Shareholders, by execution of
this  Letter of  Transmittal (or  a facsimile), waive  any right  to receive any
notice of the acceptance of their Shares for payment.
 
    3.  INADEQUATE SPACE.  If the  space provided in this Letter of  Transmittal
is  inadequate, the information required  under "Description of Shares Tendered"
should be  listed on  a separate  signed  schedule attached  to this  Letter  of
Transmittal.
 
    4.   PARTIAL TENDERS.   If fewer than  all of the  Shares represented by any
Certificates delivered to the Depositary with this Letter of Transmittal are  to
be  tendered, fill in the number  of Shares which are to  be tendered in the box
entitled "Number of Shares Tendered." In  such cases, a new Certificate for  the
remainder  of the Shares that were evidenced  by your old Certificate(s) will be
sent, without  expense, to  the person(s)  signing this  Letter of  Transmittal,
unless  otherwise provided in the box entitled "Special Payment Instructions" or
the box entitled "Special Delivery Instructions" on this Letter of  Transmittal,
as  soon as  practicable after  the Expiration  Date. All  Shares represented by
Certificate(s) delivered to the Depositary will be deemed to have been  tendered
unless otherwise indicated.
 
    5.    SIGNATURES  ON  LETTER OF  TRANSMITTAL,  INSTRUMENTS  OF  TRANSFER AND
ENDORSEMENTS.   If  this Letter  of  Transmittal  is signed  by  the  registered
holder(s)  of  the  Shares  tendered hereby,  the  signature(s)  must correspond
exactly with the name(s)  as written on the  face of the Certificate(s)  without
alteration, enlargement or any change whatsoever.
 
    If  any of  the Shares tendered  hereby are owned  of record by  two or more
joint owners, all the owners must sign this Letter of Transmittal.
 
    If any of the tendered Shares  are registered in different names on  several
Certificates, it will be necessary to complete, sign and submit as many separate
Letters of Transmittal as there are different registrations of Certificates.
 
    If this Letter of Transmittal or any Certificates or instruments of transfer
are  signed by  a trustee, executor,  administrator, guardian, attorney-in-fact,
officer of a corporation or other person acting in a fiduciary or representative
capacity, that  person should  so  indicate when  signing, and  proper  evidence
satisfactory  to  Purchaser  of  that  person's  authority  to  so  act  must be
submitted.
 
    If this Letter of Transmittal is  signed by the registered holder(s) of  the
Shares  listed  and  transmitted  hereby,  no  endorsements  of  Certificates or
separate instruments of transfer are required  unless payment is to be made,  or
Certificates  not tendered or not  purchased are to be  issued or returned, to a
person other than the  registered holder(s). Signatures  on the Certificates  or
instruments of transfer must be guaranteed by an Eligible Institution.
 
    If  this  Letter  of  Transmittal  is signed  by  a  person  other  than the
registered holder(s) of the  Shares evidenced by  the Certificate(s) listed  and
transmitted  hereby,  the  Certificate(s)  must be  endorsed  or  accompanied by
appropriate instruments  of  transfer, in  either  case signed  exactly  as  the
name(s)  of the registered holder(s) appear on the Certificate(s). Signatures on
the Certificate(s) or instruments of transfer must be guaranteed by an  Eligible
Instruction.
 
    6.   TRANSFER TAXES.   Except as set forth  in this Instruction 6, Purchaser
will pay or cause to be paid any transfer taxes with respect to the transfer and
sale of Shares to it or its order pursuant to the Offer. If, however, payment of
the purchase price is to be made to, or (in the circumstances permitted  hereby)
if Certificates for Shares not tendered or not purchased are to be registered in
the  name of,  any person  other than the  registered holder(s),  or if tendered
Certificates are registered in the name  of any person other than the  person(s)
signing  this Letter of  Transmittal, the amount of  any transfer taxes (whether
imposed on the registered  holder(s) or such person)  payable on account of  the
transfer  to  such  person  will  be deducted  from  the  purchase  price unless
satisfactory evidence of  the payment of  such taxes or  exemption therefrom  is
submitted.
 
    Except  as provided  in this  Instruction 6,  it will  not be  necessary for
transfer tax stamps to be affixed to the Certificate(s) listed in this Letter of
Transmittal.
 
    7.  SPECIAL PAYMENT AND DELIVERY INSTRUCTIONS.  If a check and  Certificates
for  unpurchased Shares are to be issued in  the name of a person other than the
signer of  this  Letter  of  Transmittal  or  if a  check  is  to  be  sent  and
Certificates  are to be returned to someone other than the signer of this Letter
of Transmittal or to an address
<PAGE>
other than that shown above, the appropriate boxes on this Letter of Transmittal
should be completed. If any tendered Shares are not purchased for any reason and
the Shares are  delivered by Book-Entry  Transfer Facility, the  Shares will  be
credited  to  an  account  maintained  at  the  appropriate  Book-Entry Transfer
Facility.
 
    8.  REQUESTS FOR  ASSISTANCE OR ADDITIONAL COPIES.   Questions and  requests
for  assistance may be directed  to the Information Agent  (as defined below) at
its address or  telephone number  set forth  below and  requests for  additional
copies  of the Offer to  Purchase, this Letter of  Transmittal and the Notice of
Guaranteed Delivery  may  be  directed  to the  Information  Agent  or  brokers,
dealers,  commercial  banks  and  trust companies  and  such  materials  will be
furnished at Purchaser's expense.
 
    9.  WAIVER  OF CONDITIONS.   The conditions of  the Offer may  be waived  by
Purchaser,  (subject to certain limitations in  the Merger Agreement (as defined
in the Offer to  Purchase)), in whole or  in part, at any  time or from time  to
time, in Purchaser's sole discretion.
 
    10.   BACKUP  WITHHOLDING TAX.   Each  tendering Shareholder  is required to
provide the Depositary with a correct Taxpayer Identification Number ("TIN")  on
Substitute  Form W-9, which is provided  under "Important Tax Information" below
and to  certify that  the  Shareholder is  not  subject to  backup  withholding.
Failure  to provide the information  on the Substitute Form  W-9 may subject the
tendering Shareholder to a penalty and 31% federal income tax backup withholding
on the  payment  of  the  purchase  price  for  the  Shares.  If  the  tendering
Shareholder  has not been issued a  TIN and has applied for  a TIN or intends to
apply for a TIN in the near  future, the tendering Shareholder should check  the
box in Part III of the Substitute Form W-9 and sign and date both the Substitute
Form  W-9  and the  "Certificate of  Awaiting  Taxpayer Identification."  If the
Shareholder has indicated in the box in Part III that a TIN has been applied for
and the  Depositary is  not provided  with a  TIN by  the time  of payment,  the
Depositary will withhold 31% of all payments of the purchase price, if any, made
thereafter pursuant to the Offer until a TIN is provided to the Depositary.
 
    11.   LOST  OR DESTROYED CERTIFICATES.   If  any Certificate(s) representing
Shares has  been lost,  destroyed  or stolen,  the Shareholder  should  promptly
notify  the Depositary  by checking the  box immediately  preceeding the special
payment/special delivery instructions and indicating the number of Shares  lost.
The  Shareholders will then be instructed as to  the steps that must be taken in
order to  replace the  Certificate(s). This  Letter of  Transmittal and  related
documents  cannot  be  processed  until the  procedures  for  replacing  lost or
destroyed Certificates have been followed.
 
    IMPORTANT:   THIS  LETTER OF  TRANSMITTAL  OR A  MANUALLY  SIGNED  FACSIMILE
(TOGETHER  WITH CERTIFICATES  OR A  BOOK-ENTRY CONFIRMATION  FOR SHARES  AND ANY
OTHER REQUIRED DOCUMENTS)  MUST BE RECEIVED  BY THE DEPOSITARY,  OR A NOTICE  OF
GUARANTEED  DELIVERY MUST  BE RECEIVED  BY THE  DEPOSITARY, ON  OR PRIOR  TO THE
EXPIRATION DATE.
 
                           IMPORTANT TAX INFORMATION
 
    Under current federal income  tax law, a  Shareholder whose tendered  Shares
are  accepted for payment is required to  provide the Depositary (as payer) with
such Shareholder's correct TIN on Substitute Form W-9 below. If such Shareholder
is an  individual, the  TIN is  his  social security  number. If  the  tendering
Shareholder  has not been issued a  TIN and has applied for  a TIN or intends to
apply for a TIN in  the near future, the Shareholder  should so indicate on  the
Substitute  Form W-9. See Instruction 10. If the Depositary is not provided with
the correct TIN, the Shareholder may be subject to a $50 penalty imposed by  the
Internal Revenue Service. In addition, payments that are made to the Shareholder
with  respect to Shares purchased pursuant to the Offer may be subject to backup
federal income tax withholding at a 31% rate.
 
    Certain Shareholders (including, among others, all corporations and  certain
foreign  individuals) are not subject to  these backup withholding and reporting
requirements and should  indicate their  status by writing  "exempt" across  the
face  of, and  by signing and  dating, the Substitute  Form W-9. In  order for a
foreign individual  to qualify  as an  exempt recipient,  that Shareholder  must
submit  a  statement,  signed  under penalties  of  perjury,  attesting  to that
individual's exempt status. Forms for such  statements can be obtained from  the
Depositary.   See  the   enclosed  Guidelines   for  Certificates   of  Taxpayer
Identification Number on Substitute Form W-9 for additional instructions.
 
    If backup withholding applies, the Depositary is required to withhold 31% of
any payments made to  the Shareholder. Backup withholding  is not an  additional
tax.  Rather,  the federal  income tax  liability of  persons subject  to backup
withholding will  be reduced  by  the amount  of  tax withheld.  If  withholding
results  in an overpayment of taxes, a  refund may be obtained from the Internal
Revenue Service.
<PAGE>
PURPOSE OF SUBSTITUTE FORM W-9
 
    To prevent backup federal income tax withholding with respect to payment  of
the  purchase price  for Shares purchased  pursuant to the  Offer, a Shareholder
must provide the Depositary  with his correct TIN  by completing the  Substitute
Form  W-9 below,  certifying that  the TIN  provided on  Substitute Form  W-9 is
correct (or that the Shareholder is awaiting a TIN) and that (1) the Shareholder
has not been  notified by the  Internal Revenue  Service that he  is subject  to
backup withholding as a result of failure to report all interest or dividends or
(2)  the Internal  Revenue Service  has notified the  Shareholder that  he is no
longer subject to backup withholding.
 
WHAT NUMBER TO GIVE THE DEPOSITARY
 
    The Shareholder  is required  to  give the  Depositary the  social  security
number  or employer  identification number  of the  record holder  of the Shares
tendered hereby. If the Shares are registered  in more than one name or are  not
in   the  name  of  the  actual  owner,  consult  the  enclosed  Guidelines  for
Certification of  Taxpayer  Identification Number  on  Substitute Form  W-9  for
additional guidance on which number to report.
<PAGE>
 
                                   IMPORTANT
                 SHAREHOLDER: SIGN HERE AND COMPLETE SUBSTITUTE
                                      FORM W-9 ON REVERSE
  .              ,
                        (Signature(s) of Shareholder(s))
  .              ,
                        (Signature(s) of Shareholder(s))
Dated: , 1996
    (Must  be signed by the registered holder(s) exactly as name(s) appear(s) on
the Certificate or on a security position listing or by person(s) authorized  to
become  registered holder(s) by Certificates and documents transmitted herewith.
If   signature   is   by   trustees,   executors,   administrators,   guardians,
attorneys-in-fact,  agents,  officers  or  corporations or  others  acting  in a
fiduciary or representative capacity, please provide the following  information.
See Instruction 5.)
Name(s):
                             (Please type or Print)
Capacity (Full Title):
                              (See Instruction 5)
Address:
                               (Include Zip Code)
                    Daytime Area Code and Telephone Number:
                                     (Home)
                                   (Business)
                Taxpayer Identification or Social Security No.:
                   (See Substitute Form W-9 on Reverse Side)
                           GUARANTEE OF SIGNATURE(S)
                           (SEE INSTRUCTIONS 1 AND 5)
                           (Authorized Signature(s))
                                     (Name)
                                 (Name of Firm)
 
                          (Address Including Zip Code)
                        (Area Code and Telephone Number)
Dated: , 1996
 
<PAGE>
 
<TABLE>
<S>                          <C>                                <C>
                     PAYER'S NAME: THE CHASE MANHATTAN BANK (NATIONAL ASSIOCATION)
 SUBSTITUTE                  PART I -- PLEASE PROVIDE YOUR TIN  PART III--Social Security Number
 FORM W-9                    IN  THE BOX AT  RIGHT AND CERTIFY  OR Employee Identification Number
 DEPARTMENT OF THE TREASURY  BY SIGNING AND DATING BELOW.
 INTERNAL REVENUE SERVICE                                       (If awaiting TIN write "Applied for")
 PAYER'S REQUEST FOR
 TAXPAYER
 IDENTIFICATION NUMBER
 (TIN)
                             PART II --  For Payees  exempt from  backup withholding,  see the  enclosed
                             Guidelines   for  Certification   of  Taxpayer   Identification  Number  on
                             Substitute Form W-9 and complete as instructed therein.
 Certifications--Under penalties of perjury, I certify that:
 (1)  The number shown on this form is my correct Taxpayer Identification Number (or I am waiting for a
      number to be issued to me); and
 (2)  I am not  subject to backup withholding  either because I have not  been notified by the  Internal
      Revenue  Service (IRS) that I am subject to backup  withholding as a result of a failure to report
      all interest or  dividends, or  the IRS has  notified me  that I am  no longer  subject to  backup
      withholding.
 Certification Instructions--You must cross out item (2) above if you have been notified by the IRS that
 you  are subject  to backup  withholding because of  underreporting interest  or dividends  on your tax
 return. However, if after  being notified by the  IRS that you are  subject to backup withholding,  you
 receive another notification from the IRS that you were no longer subject to backup withholding, do not
 cross out item (2). (Also see instructions in the enclosed guidelines).
SIGNATURE       DATE
</TABLE>
 
NOTE: FAILURE  TO COMPLETE  AND RETURN  THIS SUBSTITUTE  FORM W-9  MAY RESULT IN
      BACKUP WITHHOLDING OF  31% OF  ANY PAYMENTS MADE  TO YOU  PURSUANT TO  THE
      OFFER TO PURCHASE. PLEASE REVIEW THE ENCLOSED GUIDELINES FOR CERTIFICATION
      OF  TAXPAYER IDENTIFICATION NUMBER  ON SUBSTITUTE FORM  W-9 FOR ADDITIONAL
      DETAILS.
 
      YOU MUST COMPLETE THE FOLLOWING CERTIFICATE IF YOU WROTE "APPLIED FOR"  IN
      THE BOX IN PART III OF THE SUBSTITUTE FORM W-9.
 
             CERTIFICATE OF AWAITING TAXPAYER IDENTIFICATION NUMBER
  I certify under penalty of perjury that a taxpayer identification number has
  not  been  issued  to me,  and  either (1)  I  have mailed  or  delivered an
  application to receive a taxpayer  identification number to the  appropriate
  Internal  Revenue Service Center or Social Security Administration Office or
  (2) I  intend to  mail  or deliver  an application  in  the near  future.  I
  understand  that if I do not provide a taxpayer identification number by the
  time of payment, 31% of all payments  of the purchase price pursuant to  the
  Offer made to me thereafter will be withheld until I provide a number.
  Signature ______________________________________  Date ______________
                    THE INFORMATION AGENT FOR THE OFFER IS:
                               MORROW & CO., INC.
                          909 Third Avenue, 20th Floor
                               New York, New York
                                 (212) 754-8000
                            Toll Free (800) 566-9061
                    Banks and Brokerage Firms, please call:
                                 (800) 662-5200
 
                      THE DEALER MANAGER FOR THE OFFER IS:
                            LAZARD FRERES & CO. LLC
                              30 Rockefeller Plaza
                            New York, New York 10020
                                 (212) 632-6717
                                 (Call Collect)
  April 17, 1996

<PAGE>
                         NOTICE OF GUARANTEED DELIVERY
                                      FOR
                        TENDER OF SHARES OF COMMON STOCK
                                       OF
                              CORVITA CORPORATION
 
         THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT,
  NEW YORK CITY TIME, ON TUESDAY, MAY 14, 1996, UNLESS THE OFFER IS EXTENDED.
 
    This  Notice  of Guaranteed  Delivery or  a notice  substantially equivalent
hereto must  be used  to accept  the Offer  (as defined  below) if  certificates
representing  the  common  stock, $.001  par  value (the  "Shares"),  of Corvita
Corporation, a  Florida  corporation,  are  not  immediately  available  or  the
procedure  for book-entry transfer cannot be completed on a timely basis or time
will not  permit  all required  documents  to  reach The  Chase  Manhattan  Bank
(National  Association)  (the "Depositary")  prior  to the  Expiration  Date (as
defined in the  Offer to Purchase).  This Notice of  Guaranteed Delivery may  be
delivered  by  hand or  transmitted  by facsimile  transmission  or mail  to the
Depositary. See Section 3 of the Offer to Purchase.
 
                        THE DEPOSITARY FOR THE OFFER IS:
 
                THE CHASE MANHATTAN BANK (NATIONAL ASSOCIATION)
 
<TABLE>
<S>                             <C>                                <C>
           BY MAIL:                  BY OVERNIGHT DELIVERY:                   BY HAND:
           Box 3032                   c/o Chase Securities              (9:00 a.m.-5:00 p.m.
   4 Chase MetroTech Center             Processing Corp.                New York City Time)
      Brooklyn, NY 11245            Fort. Lee Executive Park          1 Chase Manhattan Plaza
                                  1 Executive Drive (6th Floor)              Floor 1-B
                                       Fort. Lee, NJ 07024           Nassau and Liberty Streets
                                    By Facsimile Transmission            New York, NY 10081
                                         (201) 592-4372
                                     Information and Confirm
                                          by Telephone
                                         (201) 592-4370
</TABLE>
 
    DELIVERY OF THIS NOTICE OF GUARANTEED  DELIVERY TO AN ADDRESS OTHER THAN  AS
SET  FORTH ABOVE OR TRANSMISSION OF INSTRUCTIONS VIA A FACSIMILE TRANSMISSION TO
A NUMBER OTHER THAN AS SET FORTH ABOVE WILL NOT CONSTITUTE A VALID DELIVERY.
 
    This  Notice  of  Guaranteed  Delivery  is  not  to  be  used  to  guarantee
signatures.  If  a  signature on  a  Letter  of Transmittal  is  required  to be
guaranteed by an  "Eligible Institution"  under the  instructions thereto,  such
signature  guarantee  must  appear  in  the  applicable  space  provided  in the
signature box on the Letter of Transmittal.
 
    The Eligible  Institution  that completes  this  form must  communicate  the
guarantee  to  the Depositary  and must  deliver the  Letter of  Transmittal and
certificates for Shares to the Depositary  within the time period shown  herein.
Failure to do so could result in a financial loss to the Eligible Institution.
 
              THE GUARANTEE ON THE REVERSE SIDE MUST BE COMPLETED
<PAGE>
Ladies and Gentlemen:
 
    The   undersigned  hereby  tenders  to  HPG  Acquisition  Corp.,  a  Florida
corporation ("Purchaser"), a  direct wholly-owned subsidiary  of Pfizer Inc.,  a
Delaware  corporation ("Parent"), upon  the terms and  subject to the conditions
set forth  in  the Offer  to  Purchase, dated  April  17, 1996  (the  "Offer  to
Purchase"),  and in the related Letter of Transmittal (which together constitute
the "Offer"), receipt  of each of  which is hereby  acknowledged, the number  of
Shares  indicated below pursuant to the guaranteed delivery procedures set forth
in Section 3 of the Offer to Purchase.
 
<TABLE>
<S>                                          <C>
 
Number of Shares:                                     Name of Record Holder(s):
Certificate Nos. (if available):
Check ONE box if Shares will be tendered by            (Please type or Print)
book-entry transfer:                                        Address(es):
/ / The Depository Trust Company
/ / Midwest Securities Trust Company                         (Zip Code)
/ / Philadelphia Depository Trust Company              Area Code and Tel. No.:
Account Number:                                             Signature(s):
Dated: , 1996
</TABLE>
 
                                       2
<PAGE>
                THE GUARANTEE SET FORTH BELOW MUST BE COMPLETED
                                   GUARANTEE
                    (NOT TO BE USED FOR SIGNATURE GUARANTEE)
 
    The undersigned, an Eligible Institution (as such term is defined in Section
3 of the Offer to Purchase), hereby guarantees to deliver to the Depositary  the
certificates  representing  the  Shares  tendered  hereby,  in  proper  form for
transfer, or a Book-Entry Confirmation (as defined in Section 3 of the Offer  to
Purchase)  with respect to such Shares, in  either case together with a properly
completed and  duly  executed  Letter  of  Transmittal  (or  a  manually  signed
facsimile thereof), with any required signature guarantees or an Agent's Message
(as  defined  in  Section 2  in  the Offer  to  Purchase) in  connection  with a
book-entry  transfer,  and  any  other  documents  required  by  the  Letter  of
Transmittal,  all within three New York  Stock Exchange, Inc. trading days after
the date hereof.
 
<TABLE>
<S>                                          <C>
               Name of Firm:
                 Address:                              (Authorized Signature)
                                                                Name:
                (Zip Code)                             (Please type or print)
          Area Code and Tel. No.:                              Title:
                                                                Date:
</TABLE>
 
NOTE: DO NOT  SEND  CERTIFICATES  FOR  SHARES WITH  THIS  NOTICE  OF  GUARANTEED
      DELIVERY.  CERTIFICATES FOR SHARES SHOULD BE  SENT ONLY TOGETHER WITH YOUR
      LETTER OF TRANSMITTAL.
 
                                       3

<PAGE>
LAZARD FRERES & CO. LLC
30 ROCKEFELLER PLAZA
NEW YORK, NEW YORK 10020
 
                           OFFER TO PURCHASE FOR CASH
                     ALL OUTSTANDING SHARES OF COMMON STOCK
                                       OF
                              CORVITA CORPORATION
                                       AT
                              $10.25 NET PER SHARE
                                       BY
                             HPG ACQUISITION CORP.
                      A DIRECT WHOLLY-OWNED SUBSIDIARY OF
                                  PFIZER INC.
 
         THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT,
  NEW YORK CITY TIME, ON TUESDAY, MAY 14, 1996, UNLESS THE OFFER IS EXTENDED.
 
                                                                  April 17, 1996
 
To Brokers, Dealers, Commercial Banks,
  Trust Companies and Other Nominees:
 
    We  have been engaged by HPG Acquisition  Corp., a Florida corporation and a
direct wholly-owned subsidiary of  Pfizer Inc. ("Purchaser"),  to act as  Dealer
Manager  in connection with  Purchaser's offer to  purchase for cash  all of the
outstanding shares of common stock, $.001  par value (the "Shares"), of  Corvita
Corporation, a Florida corporation (the "Company"), for $10.25 per Share, net to
the  seller in cash, upon  the terms and subject to  the conditions set forth in
the Offer to Purchase, dated  April 17, 1996 (the  "Offer to Purchase"), and  in
the  related Letter of Transmittal (which,  together with the Offer to Purchase,
constitute  the  "Offer")  enclosed.  Please  furnish  copies  of  the  enclosed
materials  to those of your  clients for whose accounts  you hold Shares in your
name or in the name of your nominee.
 
    Enclosed herewith for your  information and forwarding  to your clients  are
copies of the following documents:
 
        1.  The Offer to Purchase dated April 17, 1996.
 
        2.   The Letter of Transmittal to tender Shares for your use and for the
    information of your clients. Facsimile  copies of the Letter of  Transmittal
    may be used to tender Shares.
 
        3.   A  letter to  shareholders of  the Company  from Norman  R. Weldon,
    Ph.D., President and Chief Executive Officer of the Company, together with a
    Solicitation/Recommendation Statement  on  Schedule  14D-9  filed  with  the
    Securities and Exchange Commission by the Company and mailed to shareholders
    of the Company.
 
        4.   The Notice of  Guaranteed Delivery for Shares  to be used to accept
    the Offer if neither of the two procedures for tendering Shares set forth in
    the Offer to Purchase can be completed on a timely basis.
 
        5.  A printed form of letter which may be sent to your clients for whose
    accounts you hold  Shares registered in  your name  or in the  name of  your
    nominee,  with space provided for  obtaining such clients' instructions with
    regard to the Offer.
<PAGE>
        6.   Guidelines of  the Internal  Revenue Service  for Certification  of
    Taxpayer Identification Number on Substitute Form W-9.
 
        7.   A return  envelope addressed to The  Chase Manhattan Bank (National
    Association), the Depositary.
 
    YOUR PROMPT ACTION  IS REQUESTED.  WE URGE YOU  TO CONTACT  YOUR CLIENTS  AS
PROMPTLY AS POSSIBLE. PLEASE NOTE THAT THE OFFER AND WITHDRAWAL RIGHTS EXPIRE AT
12:00  MIDNIGHT, NEW YORK CITY TIME, ON  TUESDAY, MAY 14, 1996, UNLESS THE OFFER
IS EXTENDED.
 
    Please note the following:
 
        1.  The tender price is $10.25 per Share, net to the seller in cash.
 
        2.   The  Offer is  subject  to there  being  validly tendered  and  not
    properly  withdrawn prior to the Expiration Date (as defined in the Offer to
    Purchase) a majority of the outstanding Shares and certain other conditions.
    See the Introduction and Sections 1 and 14 of the Offer to Purchase.
 
        3.  The Offer is being made for all of the outstanding Shares.
 
        4.  Tendering shareholders will not  be obligated to pay brokerage  fees
    or  commissions or,  except as  otherwise provided  in Instruction  6 of the
    Letter of  Transmittal, transfer  taxes on  the purchase  of Shares  by  the
    Purchaser  pursuant  to  the  Offer.  However,  federal  income  tax  backup
    withholding at  a  rate of  31%  may be  required,  unless an  exemption  is
    provided  or unless the required tax identification information is provided.
    See Instruction 10 of the Letter of Transmittal.
 
        5.  The Offer and withdrawal  rights will expire at 12:00 midnight,  New
    York City time, on Tuesday, May 14, 1996, unless the Offer is extended.
 
        6.   The board of directors of the Company has determined that the Offer
    and the Merger (as defined in the Offer to Purchase) are fair to, and in the
    best interests of, the shareholders of the Company, has approved the  Merger
    Agreement  (as defined in the Offer to Purchase), the Shareholders Agreement
    (as defined in the Offer to Purchase),  and the Offer and the Merger in  all
    respects  and recommends  that the  shareholders of  the Company  accept the
    Offer and tender their Shares pursuant thereto.
 
        7.  Notwithstanding any other provision of the Offer, payment for Shares
    accepted for payment pursuant to  the Offer will in  all cases be made  only
    after  timely receipt by the Depositary of (a) certificates for (or a timely
    Book-Entry Confirmation (as defined in Section  3 to the Offer to  Purchase)
    with  respect to) such Shares, (b) the  Letter of Transmittal (or a manually
    signed facsimile), properly  completed and duly  executed with any  required
    signature  guarantees  or an  Agent's Message  (as defined  in the  Offer to
    Purchase) in  connection  with a  book-entry  transfer, and  (c)  any  other
    documents  required by the  Letter of Transmittal.  Accordingly, payment may
    not be made to  all tendering shareholders at  the same time depending  upon
    when  certificates  for Shares  or Book-Entry  Confirmation with  respect to
    Shares are actually received by the Depositary.
 
    In order to take advantage  of the Offer, (i)  a duly executed and  properly
completed  Letter  of  Transmittal  (or a  manually  signed  facsimile)  and any
required signature guarantees or other required documents should be sent to  the
Depositary  and (ii) certificates  representing the tendered  Shares or a timely
Book-Entry Confirmation (as defined in Section 3 to the Offer to Purchase)  with
respect  to such Shares should be delivered to the Depositary in accordance with
the instructions  set  forth in  the  Letter of  Transmittal  and the  Offer  to
Purchase.
 
                                       2
<PAGE>
    If  holders of Shares  wish to tender,  but it is  impracticable for them to
forward  their  certificates  or  other  required  documents  or  complete   the
procedures  for book-entry transfer prior to  the Expiration Date (as defined in
the Offer to  Purchase) a  tender may be  effected by  following the  guaranteed
delivery procedures specified in Section 3 of the Offer to Purchase.
 
    Neither  Purchaser nor Pfizer Inc.  will pay any fees  or commissions to any
broker or dealer or  other person for soliciting  tenders of Shares pursuant  to
the  Offer (other than the Dealer  Manager, Depositary and the Information Agent
as described in the Offer to  Purchase). Purchaser will, however, upon  request,
reimburse  you for  customary mailing and  handling expenses incurred  by you in
forwarding any of the enclosed materials to your clients. Purchaser will pay  or
cause  to be paid  any transfer taxes payable  on the transfer  of Shares to it,
except as otherwise provided in Instruction 6 of the Letter of Transmittal.
 
    Any inquiries you may have with respect to the Offer should be addressed  to
Lazard  Freres & Co.  LLC, the Dealer  Manager for the  Offer, at 30 Rockefeller
Plaza, New York,  New York  10020, (212)  632-6717 or  Morrow &  Co., Inc.,  the
Information Agent for the Offer, at 909 Third Avenue, New York, New York 10022.
 
    Requests  for copies of the  enclosed materials may also  be directed to the
Dealer Manager or  the Information Agent  at the above  addresses and  telephone
numbers.
 
                                          Very truly yours,
                                          LAZARD FRERES & CO. LLC
 
    NOTHING  CONTAINED HEREIN OR IN THE  ENCLOSED DOCUMENTS SHALL CONSTITUTE YOU
OR ANY OTHER PERSON THE AGENT OF PURCHASER, THE COMPANY, THE DEALER MANAGER, THE
DEPOSITARY, THE INFORMATION AGENT OR ANY AFFILIATE OF ANY OF THEM, OR  AUTHORIZE
YOU  OR ANY OTHER PERSON TO MAKE ANY  STATEMENT OR USE ANY DOCUMENT ON BEHALF OF
ANY OF THEM IN CONNECTION WITH THE  OFFER OTHER THAN THE ENCLOSED DOCUMENTS  AND
THE STATEMENTS CONTAINED THEREIN.
 
                                       3

<PAGE>
                           OFFER TO PURCHASE FOR CASH
                     ALL OUTSTANDING SHARES OF COMMON STOCK
                                       OF
                              CORVITA CORPORATION
                                       AT
                              $10.25 NET PER SHARE
                                       BY
                             HPG ACQUISITION CORP.
                      A DIRECT WHOLLY-OWNED SUBSIDIARY OF
                                  PFIZER INC.
 
         THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT,
  NEW YORK CITY TIME, ON TUESDAY, MAY 14, 1996, UNLESS THE OFFER IS EXTENDED.
 
                                                                  April 17, 1996
 
To Our Clients:
 
    Enclosed  for your consideration are the  Offer to Purchase, dated April 17,
1996 (the "Offer  to Purchase"), and  the related Letter  of Transmittal  (which
together constitute the "Offer") relating to the offer by HPG Acquisition Corp.,
a  Florida  corporation  and a  direct  wholly-owned subsidiary  of  Pfizer Inc.
("Purchaser"), to purchase all the outstanding shares of common stock, $.001 par
value (the  "Shares"),  of  Corvita  Corporation,  a  Florida  corporation  (the
"Company"),  at a purchase price of $10.25 per Share, net to the seller in cash,
upon the terms and subject to the conditions set forth in the Offer. Holders  of
Shares  whose certificates for such Shares  are not immediately available or who
cannot deliver  their  certificates and  all  other required  documents  to  the
depositary (the "Depositary") or complete the procedures for book-entry transfer
prior  to the Expiration Date (as defined  in the Offer to Purchase) must tender
their Shares  according  to the  guaranteed  delivery procedures  set  forth  in
Section 3 of the Offer to Purchase.
 
    WE  ARE (OR OUR  NOMINEE IS) THE HOLDER  OF RECORD OF SHARES  HELD BY US FOR
YOUR ACCOUNT. A TENDER OF SUCH  SHARES CAN BE MADE ONLY  BY US AS THE HOLDER  OF
RECORD AND PURSUANT TO YOUR INSTRUCTIONS. THE LETTER OF TRANSMITTAL IS FURNISHED
TO YOU FOR YOUR INFORMATION ONLY AND CANNOT BE USED BY YOU TO TENDER SHARES HELD
BY US FOR YOUR ACCOUNT.
 
    Accordingly, we request instruction as to whether you wish to have us tender
on  your behalf any  or all Shares held  by us for your  account pursuant to the
terms and conditions set forth in the Offer.
 
    Please note the following:
 
        1.  The tender price is $10.25 per Share, net to the seller in cash.
 
        2.   The  Offer is  subject  to there  being  validly tendered  and  not
    properly   withdrawn  prior  to  the  Expiration  Date  a  majority  of  the
    outstanding Shares and  certain other conditions.  See the Introduction  and
    Sections 1 and 14 of the Offer to Purchase.
 
        3.  The Offer is being made for all of the outstanding Shares.
 
        4.   Tendering shareholders will not be obliged to pay brokerage fees or
    commissions or, except as otherwise provided in Instruction 6 of the  Letter
    of  Transmittal,  transfer  taxes on  the  purchase of  Shares  by Purchaser
    pursuant to the Offer. However, federal  income tax backup withholding at  a
    rate  of 31% may be required, unless  an exemption is provided or unless the
    required taxpayer identification information is provided. See Instruction 10
    of the Letter of Transmittal.
<PAGE>
        5.  The Offer and withdrawal  rights will expire at 12:00 midnight,  New
    York City time, on Tuesday, May 14, 1996, unless the Offer is extended.
 
        6.   The board of directors of the Company has determined that the Offer
    and the Merger (as defined in the Offer to Purchase) are fair to, and in the
    best interests of, the shareholders of the Company, has approved the  Merger
    Agreement  (as defined in the Offer to Purchase), the Shareholders Agreement
    (as defined in the Offer to Purchase),  and the Offer and the Merger in  all
    respects  and recommends  that the  shareholders of  the Company  accept the
    Offer and tender their Shares pursuant thereto.
 
        7.  Notwithstanding any other provision of the Offer, payment for Shares
    accepted for payment pursuant to  the Offer will in  all cases be made  only
    after  timely receipt by the Depositary of (a) certificates for (or a timely
    Book-Entry Confirmation (as defined in Section  3 to the Offer to  Purchase)
    with  respect to) such Shares, (b) the  Letter of Transmittal (or a manually
    signed facsimile), properly  completed and duly  executed with any  required
    signature  guarantees  or an  Agent's Message  (as defined  in the  Offer to
    Purchase) in  connection  with a  book-entry  transfer, and  (c)  any  other
    documents  required by the  Letter of Transmittal.  Accordingly, payment may
    not be made to  all tendering shareholders at  the same time depending  upon
    when  certificates  for Shares  or Book-Entry  Confirmation with  respect to
    Shares are actually received by the Depositary.
 
    If you wish to have us tender any or  all of the Shares held by us for  your
account, please so instruct us by completing, executing, detaching and returning
to  us the instruction form set forth below. If you authorize the tender of your
Shares, all such Shares  will be tendered unless  otherwise specified below.  An
envelope to return your instructions to us is enclosed. Your instructions should
be  forwarded to us in ample time to permit us to submit a tender on your behalf
prior to the expiration of the Offer.
 
    The Offer is  not being made  to (nor will  tenders be accepted  from or  on
behalf of) holders of Shares residing in any jurisdiction in which the making of
the  Offer  or  the acceptance  thereof  would  not be  in  compliance  with the
securities, blue sky or other laws of such jurisdiction. However, Purchaser may,
in its discretion, take such action as  it may deem necessary to make the  Offer
to holders of Shares in such jurisdiction.
 
    In any jurisdiction where the securities, blue sky or other laws require the
Offer  to be made by a licensed broker or dealer, the Offer will be deemed to be
made on behalf of Purchaser  by one or more  registered brokers or dealers  that
are licensed under the laws of such jurisdiction.
 
                                       2
<PAGE>
                        INSTRUCTIONS WITH RESPECT TO THE
                           OFFER TO PURCHASE FOR CASH
                     ALL OUTSTANDING SHARES OF COMMON STOCK
                                       OF
                              CORVITA CORPORATION
 
    The undersigned acknowledge(s) receipt of your letter, the enclosed Offer to
Purchase,  dated April  17, 1996, and  the related Letter  of Transmittal (which
together constitute the "Offer") in connection with the offer by HPG Acquisition
Corp., a Florida corporation and a direct wholly-owned subsidiary of Pfizer Inc.
("Purchaser"), to purchase  all outstanding  shares of common  stock, par  value
$.001 per share ("Shares"), of Corvita Corporation, a Florida corporation.
 
    This will instruct you to tender to Purchaser the number of Shares indicated
below (or if no number is indicated below, all Shares) which are held by you for
the account of the undersigned, upon the terms and subject to the conditions set
forth in the Offer.
 
Number of Shares to be Tendered*: ______________________________________________
Date: __________________________________________________________________________
________________________________________________________________________________
                                    SIGN HERE
Signature(s): __________________________________________________________________
(Print Name(s)): _______________________________________________________________
(Print Address(es)): ___________________________________________________________
(Area Code and Telephone Number(s)): ___________________________________________
(Taxpayer Identification or Social Security Number(s)): ________________________
 
*Unless  otherwise indicated, it will be assumed  that all Shares held by us for
 your account are to be tendered.
 
                                       3

<PAGE>
            GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
                         NUMBER ON SUBSTITUTE FORM W-9
 
GUIDELINES  FOR  DETERMINING  THE  PROPER  IDENTIFICATION  NUMBER  TO  GIVE  THE
PAYER.--Social Security numbers have nine digits separated by two hyphens: i.e.,
000-00-0000. Employer identification numbers have nine digits separated by  only
one  hyphen: i.e., 00-0000000. The table below will help determine the number to
give the payer.
 
- ----------------------------------------------
 
<TABLE>
<CAPTION>
<S>                                     <C>
                                        GIVE THE
FOR THIS TYPE OF ACCOUNT:               SOCIAL SECURITY
                                        NUMBER OF--
</TABLE>
 
- ----------------------------------------------------------
 
<TABLE>
<C>        <S>                          <C>
       1.  An individual's account      The individual
 
       2.  Two or more individuals      The actual owner of the
           (joint account)              account or, if combined
                                        funds, any one of the
                                        individuals(1)
 
       3.  Husband and wife (joint      The actual owner of the
           account)                     account or, if joint
                                        funds, either person(1)
 
       4.  Custodian account of a       The minor(2)
           minor (Uniform Gift to
           Minors Act)
 
       5.  Adult and minor (joint       The adult or, if the
           account)                     minor is the only
                                        contributor, the minor(1)
 
       6.  Account in the name of       The ward, minor, or
           guardian or committee for a  incompetent person(3)
           designated ward, minor, or
           incompetent person
 
       7.  a. The usual revocable       The grantor-trustee(1)
           savings trust account
              (grantor is also
              trustee)
 
           b. So-called trust account   The actual owner(1)
           that is not a legal or
              valid trust under State
              law
 
       8.  Sole proprietorship account  The owner(4)
</TABLE>
 
- ----------------------------------------------------------
 
- ----------------------------------------------------------
 
<TABLE>
<CAPTION>
<S>                                     <C>
                                        GIVE THE EMPLOYER
FOR THIS TYPE OF ACCOUNT:               IDENTIFICATION
                                        NUMBER OF--
</TABLE>
 
- ----------------------------------------------------------
 
<TABLE>
<C>        <S>                          <C>
       9.  A valid trust, estate, or    The legal entity (Do not
           pension trust                furnish the identifying
                                        number of the personal
                                        representative or trustee
                                        unless the legal entity
                                        itself is not designated
                                        in the account title.)(5)
 
      10.  Corporate account            The corporation
 
      11.  Religious, charitable,       The organization
           educational organization
           account
 
      12.  Partnership account held in  The partnership
           the name of the business
 
      13.  Association, club or other   The organization
           tax-exempt organization
 
      14.  A broker or registered       The broker or nominee
           nominee
 
      15.  Account with the Department  The public entity
           of Agriculture in the name
           of a public entity (such as
           a state or local
           government, school
           district, or prison) that
           receives agricultural
           program payments
</TABLE>
 
- ----------------------------------------------
 
(1) List first and circle the name of the person whose number you furnish.
 
(2) Circle the minor's name and furnish the minor's social security number.
 
(3) Circle the ward's,  minor's or  incompetent person's name  and furnish  such
    person's social security number.
 
(4) Show the name of the owner.
 
(5) List first and circle the name of the legal trust, estate or pension trust.
 
NOTE: If no name is circled when there is more than one name, the number will be
      considered to be that of the first name listed.
<PAGE>
            GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
                         NUMBER ON SUBSTITUTE FORM W-9
                                     PAGE 2
 
OBTAINING A NUMBER
 
If  you  don't have  a taxpayer  identification  number or  you don't  know your
number, obtain Form SS-5, Application for a Social Security Number Card, or Form
SS-4, Application for Employer Identification Number, from your local office  of
the Social Security Administration or the Internal Revenue Service and apply for
a number.
 
PAYEES EXEMPT FROM BACKUP WITHHOLDING
 
Payees  specifically exempted from  backup withholding on  payments of interest,
dividends and with respect to broker transactions include the following:
 
 - A corporation.
 
 - A financial institution.
 
 - An organization  exempt  from tax  under  section 501(a),  or  an  individual
   retirement plan.
 
 - The United States or any agency or instrumentality thereof.
 
 - A  State, the District of Columbia, a  possession of the United States or any
   subdivision or instrumentality thereof.
 
 - A foreign government, a political subdivision of a foreign government, or any
   agency or instrumentality thereof.
 
 - An international organization or any agency or instrumentality thereof.
 
 - A registered dealer in securities or commodities registered in the U.S. or  a
   possession of the U.S.
 
 - A real estate investment trust.
 
 - A common trust fund operated by a bank under section 584(a).
 
 - An  exempt charitable  remainder trust,  or a  non-exempt trust  described in
   section 4947(a)(1).
 
 - An entity registered at all times under the Investment Company Act of 1940.
 
 - A foreign central bank of issue.
 
    Payments of  dividends  and patronage  dividends  not generally  subject  to
backup withholding include the following:
 
 - Payments to nonresident aliens subject to withholding under section 1441.
 
 - Payments  to partnerships not engaged in a  trade or business in the U.S. and
   which have at least one nonresident partner.
 
 - Payments of patronage  dividends where  the amount  received is  not paid  in
   money.
 
 - Payments made by certain foreign organizations.
 
 - Payments  made to a middleman known in  the investment community as a nominee
   as listed in the most recent publication of the American Society of Corporate
   Secretaries, Inc., Nominee List.
 
    Payments of interest not generally subject to backup withholding include the
following:
 
 - Payments of interest on obligations issued  by individuals. NOTE: You may  be
   subject to backup withholding if this interest is $600 or more and is paid in
   the  course of the payer's  trade or business and  you have not provided your
   correct taxpayer identification number to the payer.
 
 - Payments of tax-exempt  interest (including  exempt-interest dividends  under
   section 852).
 
 - Payments described in section 6049(b)(5) to non-resident aliens.
 
 - Payments on tax-free covenant bonds under section 1451.
 
 - Payments made by certain foreign organizations.
 
 - Payments  made to a middleman known in  the investment community as a nominee
   as listed in the most recent publication of the American Society of Corporate
   Secretaries, Inc., Nominee List.
 
Exempt payees described above should file Substitute Form W-9 to avoid  possible
erroneous backup withholding.
 
FILE  THIS FORM  WITH THE  PAYER, FURNISH  YOUR TAXPAYER  IDENTIFICATION NUMBER,
WRITE "EXEMPT" ON  THE FACE  OF THE FORM,  AND RETURN  IT TO THE  PAYER. IF  THE
PAYMENTS ARE INTEREST, DIVIDENDS, OR PATRONAGE DIVIDENDS, ALSO SIGN AND DATE THE
FORM.
 
    Certain  payments, other  than interest, dividends  and patronage dividends,
that are not  subject to information  reporting are also  not subject to  backup
withholding.  For details,  see the  regulations under  sections 6041, 6041A(a),
6045 and 6050A.
 
PRIVACY ACT NOTICE.--Section 6109 requires most recipients of dividend, interest
or other payments  to give taxpayer  identification numbers to  payers who  must
report  the payments  to the  IRS. The IRS  uses the  numbers for identification
purposes. Payers  must  be given  the  numbers  whether or  not  recipients  are
required  to file  tax returns.  Payers must  generally withhold  31% of taxable
interest, dividend and certain other payments to a payee who does not furnish  a
taxpayer identification number to a payer. Certain penalties may also apply.
 
PENALTIES
 
(1)  PENALTY FOR  FAILURE TO FURNISH  TAXPAYER IDENTIFICATION NUMBER.  -- If you
fail to furnish your taxpayer identification number to a payer, you are  subject
to  a  penalty of  $50  for each  such  failure unless  your  failure is  due to
reasonable cause and not to willful neglect.
 
(2) CIVIL PENALTY FOR FALSE INFORMATION  WITH RESPECT TO WITHHOLDING. -- If  you
make  a false statement with no reasonable  basis which results in no imposition
of backup withholding, you are subject to a penalty of $500.
 
(3) CRIMINAL PENALTY FOR FALSIFYING INFORMATION. -- Falsifying certifications or
affirmations may  subject  you  to criminal  penalties  including  fines  and/or
imprisonment.
 
FOR  ADDITIONAL INFORMATION CONTACT YOUR TAX  CONSULTANT OR THE INTERNAL REVENUE
SERVICE.

<PAGE>


THIS ANNOUNCEMENT IS NEITHER AN OFFER TO PURCHASE NOR A SOLICITATION OF AN OFFER
TO SELL SHARES. THE OFFER IS MADE SOLELY BY THE OFFER TO PURCHASE, DATED APRIL
17, 1996, AND THE RELATED LETTER OF TRANSMITTAL AND ANY AMENDMENTS OR
SUPPLEMENTS THERETO, AND IS BEING MADE TO ALL HOLDERS OF SHARES. THE OFFER IS
NOT BEING MADE TO (NOR WILL TENDERS BE ACCEPTED FROM OR ON BEHALF OF) HOLDERS OF
SHARES IN ANY JURISDICTION IN WHICH THE MAKING OF THE OFFER OR THE ACCEPTANCE
THEREOF WOULD NOT BE IN COMPLIANCE WITH THE LAWS OF SUCH JURISDICTION. IN ANY
JURISDICTION WHERE THE SECURITIES, BLUE SKY OR OTHER LAWS REQUIRE THE OFFER TO
BE MADE BY A LICENSED BROKER OR DEALER, THE OFFER SHALL BE DEEMED TO BE MADE ON
BEHALF OF HPG ACQUISITION CORP. BY LAZARD FRERES & CO. LLC OR ONE OR MORE
REGISTERED BROKERS OR DEALERS LICENSED UNDER THE LAWS OF SUCH JURISDICTION.

                      NOTICE OF OFFER TO PURCHASE FOR CASH
                     ALL OUTSTANDING SHARES OF COMMON STOCK
                                       OF
                               CORVITA CORPORATION
                                       AT
                              $10.25 NET PER SHARE
                                       BY
                              HPG ACQUISITION CORP.
                        A DIRECT WHOLLY-OWNED SUBSIDIARY
                                   PFIZER INC.

     HPG Acquisition Corp., a Florida corporation ("Purchaser") and a direct 
wholly-owned subsidiary of Pfizer Inc., a Delaware corporation ("Parent"), is 
offering to purchase all outstanding shares of common stock, $.001 par value 
(the "Shares"), of Corvita Corporation, a Florida corporation (the 
"Company"), at a price of $10.25 per share, net to the seller in cash, upon 
the terms and subject to the conditions set forth in the Offer to Purchase, 
dated April 17, 1996, and the related Letter of Transmittal (which together 
constitutes the "Offer").  Tendering shareholders will not be obligated to 
pay brokerage fees or commissions or, except as set forth in Instruction 6 of 
the Letter of Transmittal, transfer taxes on the purchase of Shares pursuant 
to the Offer. The purpose of the Offer is to acquire for cash as many 
outstanding Shares as possible as a first step in acquiring the entire equity 
interest in the Company. Following consummation of the Offer, Purchaser 
intends to effect the merger described below.

THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY
TIME, ON TUESDAY, MAY 14, 1996, UNLESS EXTENDED.

     THE OFFER IS CONDITION UPON, AMONG OTHER THINGS, THERE BEING VALIDLY
TENDERED AND NOT WITHDRAWN PRIOR TO THE EXPIRATION OF THE OFFER NUMBER OF SHARES
REPRESENTING A MAJORITY OF ALL OUTSTANDING SHARES ON A FULLY DILUTED BASIS.

     The Offer is made pursuant to an Agreement and Plan of Merger, dated as of
April 11, 1996 (the "Merger Agreement"), among Parent, Purchaser and the
Company.  The Merger Agreement provides, among other things, for the
commencement of the Offer by Purchaser and further provides that after the
purchase of Shares pursuant to the Offer, subject to the satisfaction or waiver
of certain conditions, Purchaser will be merged with and into the Company (the
"Merger"), with the Company surviving the Merger as a direct, wholly-owned
subsidiary of Parent.  At the effective time of the Merger, each outstanding
Share (other than Shares owned by the Company or any Subsidiary of the Company
or by Parent, Purchaser or any other subsidiary of Parent, and Shares owned by
shareholders who shall have properly exercised their appraisal rights under
Florida law) will be converted into the right to receive $10.25 in cash or any
greater amount paid pursuant to the Offer without interest.

     Concurrently with the execution of the Merger Agreement, Parent and 
Purchaser entered into a Shareholders Agreement, dated as of April 11, 1996 
(the "Shareholders Agreement"), with certain shareholders of the Company (the 
"Selling Shareholders"), pursuant to which such Selling Shareholders have 
agreed to validly tender (and not to withdraw) in the Offer approximately 21% 
of the Company's outstanding common stock (or approximately 18% of the 
outstanding Shares on a fully diluted basis).

     THE BOARD OF DIRECTORS OF THE COMPANY (THE "BOARD") HAS (a) DETERMINED THAT
THE MERGER AGREEMENT AND THE TRANSACTIONS CONTEMPLATED THEREBY, INCLUDING THE
OFFER AND THE MERGER, ARE FAIR TO, AND IN THE BEST INTERESTS OF, THE
SHAREHOLDERS OF THE COMPANY, (b) APPROVED THE MERGER AGREEMENT AND THE
SHAREHOLDERS AGREEMENT, AND THE OFFER AND THE MERGER, IN ALL RESPECTS, AND (c)
RECOMMENDS THAT THE SHAREHOLDERS OF THE COMPANY ACCEPT THE OFFER AND TENDER
THEIR SHARES THEREUNDER TO PURCHASER PURSUANT TO THE OFFER.

     For purposes of the Offer, Purchaser will be deemed to have accepted for 
payment (and thereby purchased) tendered Shares as, if and when Purchaser 
gives oral or written notice to the Depositary (as defined in the Offer to 
Purchase) of its acceptance of such Shares for payment pursuant to the Offer. 
 Upon the terms and subject to the conditions of the Offer, payment for 
Shares purchased pursuant to the Offer will be made by deposit of the 
purchase price therefor with the Depositary, which will act as agent for 
tendering shareholders for the purposes of receiving payments from Purchaser 
and transmitting payment to tendering shareholders whose Shares have 
theretofore been accepted for payment.  In all cases, payment for Shares 
purchased pursuant to the Offer will be made only after timely receipt by the 
Depositary of (i) certificates for (or a timely Book-Entry Confirmation (as 
defined in Section 3 of the Offer to Purchase) with respect to) such Shares 
and (ii) the Letter of Transmittal (or a manually signed facsimile thereof), 
properly completed and duly executed with all required signature guarantees 
or an agent's message, and (iii) all other documents required by the Letter 
of Transmittal.  Under no circumstances will interest by paid on the purchase 
price for Shares to be paid by Purchaser, regardless of any delay in making 
such payment.

     The term "Expiration Date" shall mean 12:00 midnight, New York City 
time, on Tuesday, May 14, 1996, unless and until Purchaser, in accordance 
with the terms of the Offer and the Merger Agreement, shall have extended the 
period of time during which the Offer is open, in which event the term 
"Expiration Date" shall mean the latest time and date at which the Offer, as 
so extended by Purchaser, shall expire.  Subject to the terms of the Merger 
Agreement and applicable law, Purchaser expressly reserves the right, at any 
time or from time to time, to extend the period of time during which the 
Offer is open and thereby delay acceptance for payment of, or payment for, 
any Shares by giving oral or written notice of such extension to the 
Depositary and by making a public announcement of such extension.  Purchaser 
shall not have any obligation to pay interest on the purchase price for 
tendered Shares whether or not Purchaser exercises its right to extend the 
period of time during which the Offer is open. Any such extension will be 
followed by a public announcement thereof by no later than 9:00 a.m., New 
York City time, on the next business day after the previously scheduled 
Expiration Date.  During any such extension, all Shares previously tendered 
and not withdrawn will remain subject to the Offer, subject to the right of a 
tendering shareholder to withdraw such shareholder's Shares. Without limiting 
the manner in which Purchaser may choose to make any public announcement, 
Purchaser will have no obligation to publish, advertise or otherwise 
communicate any such announcement other than by issuing a release to the Dow 
Jones News Service or as otherwise may be required by law.

     Except as otherwise provided in the Offer to Purchase, tenders of Shares 
are irrevocable.  Shares tendered pursuant to the Offer may be withdrawn any 
time prior to the Expiration Date and, unless theretofore accepted for 
payment by Purchaser as provided for in the Offer to Purchase, may also be 
withdrawn at any time after Saturday, June 15, 1996.  For a withdrawal to be 
effective, a written, telegraphic or facsimile transmission notice of 
withdrawal must be timely received by the Depositary at its address set forth 
on the back cover of the Offer to Purchase.  Any such notice of withdrawal 
must specify the name of the person who tendered the Shares to be withdrawn 
the number of Shares to be withdrawn and the name of the registered holder, 
if different from that of the person who tendered such Shares.  If 
certificates evidencing Shares have been delivered or otherwise identified to 
the Depositary, then prior to the release of such certificates, the tendering 
shareholder must also submit the serial numbers shown on the particular 
certificates evidencing the Shares to be withdrawn, and the signature on the 
notice of withdrawal must be guaranteed by an Eligible Institution, as 
defined in Section 3 of the Offer to Purchase (except in the case of Shares 
tendered for the account of an Eligible Institution).  If Shares have been 
tendered pursuant to the procedure for book-entry transfer set forth in 
Section 3 of the Offer to Purchase, the notice of withdrawal must specify the 
name and number of the account at the applicable Book-Entry Transfer Facility 
(as defined in Section 3 of the Offer to Purchase) to be credited with the 
withdrawn Shares.  All questions as to the form and validity (including time 
of receipt) of notices of withdrawal will be determined by Purchaser, in its 
sole discretion, whose determination shall be final and binding on all 
parties.  Any Shares properly withdrawn will be deemed not validly tendered 
for purposes of the Offer, but may be tendered at any subsequent time prior 
to the Expiration Date by following any of the procedures described in 
Section 3 of the Offer to Purchase.

     The Company has provided Purchaser with the Company's shareholder list and
security position listings for the purpose of disseminating the Offer to holders
of Shares.  The Offer to Purchase, the related Letter of Transmittal and, if
required, any other relevant materials will be mailed to record holders of
Shares and will be furnished to brokers, dealers, commercial banks, trust
companies and similar persons whose names, or the name of whose nominees, appear
on the Company's shareholders list or, if applicable, who are listed as
participants in a clearing agency's security position listing, for subsequent
transmittal to beneficial owners of Shares by Purchaser.

     The information required to be disclosed by paragraph (e)(1)(vii) of Rule
14d-6 of the General Rules and Regulations under the Securities Exchange Act of
1934, as amended, is contained in the Offer to Purchase and is incorporated
herein by reference.

     THE OFFER TO PURCHASE AND THE RELATED LETTER OF TRANSMITTAL CONTAIN
IMPORTANT INFORMATION WHICH SHOULD BE READ CAREFULLY BEFORE ANY DECISION IS MADE
WITH RESPECT TO THE OFFER.
<PAGE>

     Requests for copies of the Offer to Purchase, the Letter of Transmittal 
and other tender offer documents may be directed to the Information Agent as 
set forth below, and copies will be furnished promptly at Purchaser's 
expense.  Questions or requests for assistance may be directed to the 
Information Agent or the Dealer Manager.  Neither Purchaser nor Parent will 
pay any fees or commissions to any broker or dealer or other person (other 
than the Dealer Manager, the Depositary and the Information Agent) in 
connection with the solicitation of tenders of Shares pursuant to the Offer.

                     THE INFORMATION AGENT FOR THE OFFER IS:

                               MORROW & CO., INC.
                                909 Third Avenue
                                   20th Floor
                            New York, New York 10022
                                 (212) 754-8000
                            Toll Free (800) 566-9061

                     Banks and Brokerage Firms, please call:
                                 (800) 662-5200

                        THE DEPOSITARY FOR THE OFFER IS:

                         THE CHASE MANHATTAN BANK, N.A.

<TABLE>

<S>                                  <C>                                      <C>
           BY MAIL:                         BY OVERNIGHT DELIVERY:                         BY HAND:
           Box 3032                  c/o Chase Securities Processing Corp.          (9:00 a.m. - 5:00 p.m.
   4 Chase MetroTech Center                 Ft. Lee Executive Park                    New York City time)
      Brooklyn, NY 11245                 1 Executive Drive (6th Floor)        1 Chase Manhattan Plaza, Floor 1-B
                                               Ft. Lee, NJ 07024                  Nassau and Liberty Streets
                                                                                      New York, NY 10081

</TABLE>


                           BY FACSIMILE TRANSMISSION:
                                 (201) 592-4372

                              CONFIRM BY TELEPHONE:
                                 (201) 592-4370

                      THE DEALER MANAGER FOR THE OFFICE IS:
                             LAZARD FRERES & CO. LLC
                              30 Rockefeller Plaza
                            New York, New York 10020
                                 (212) 632-6717
                                 (call collect)

                                 April 17, 1996


<PAGE>



                          AGREEMENT AND PLAN OF MERGER

                                      AMONG

                                  PFIZER INC.,

                              HPG ACQUISITION CORP.

                                       AND

                               CORVITA CORPORATION

                           Dated as of April 11, 1996

<PAGE>

                                TABLE OF CONTENTS


                                                                            Page

ARTICLE I      THE OFFER . . . . . . . . . . . . . . . . . . . . . . . . . .   2
     SECTION 1.1    The Offer. . . . . . . . . . . . . . . . . . . . . . . .   2
     SECTION 1.2    Company Action . . . . . . . . . . . . . . . . . . . . .   4
     SECTION 1.3    Directors. . . . . . . . . . . . . . . . . . . . . . . .   6

ARTICLE II     THE MERGER. . . . . . . . . . . . . . . . . . . . . . . . . .   7
     SECTION 2.1    The Merger . . . . . . . . . . . . . . . . . . . . . . .   7
     SECTION 2.2    Effective Time . . . . . . . . . . . . . . . . . . . . .   7
     SECTION 2.3    Closing. . . . . . . . . . . . . . . . . . . . . . . . .   7
     SECTION 2.4    Effects of the Merger. . . . . . . . . . . . . . . . . .   8
     SECTION 2.5    Articles of Incorporation and Bylaws . . . . . . . . . .   8
     SECTION 2.6    Directors and Officers . . . . . . . . . . . . . . . . .   8
     SECTION 2.7    Merger Without Meeting of Shareholders.. . . . . . . . .   8

ARTICLE III    EFFECT OF THE MERGER ON THE CAPITAL
               STOCK OF THE CONSTITUENT CORPORATIONS . . . . . . . . . . . .   8
     SECTION 3.1    Effect on Capital Stock. . . . . . . . . . . . . . . . .   8
     SECTION 3.2    Stock Options; Warrants. . . . . . . . . . . . . . . . .   9

ARTICLE IV     PAYMENT OF SHARES . . . . . . . . . . . . . . . . . . . . . .  10
     SECTION 4.1    Payment for Shares . . . . . . . . . . . . . . . . . . .  10
     SECTION 4.2    Stock Transfer Books . . . . . . . . . . . . . . . . . .  13
     SECTION 4.3    Dissenting Shares. . . . . . . . . . . . . . . . . . . .  13
     SECTION 4.4    Right to Merger Consideration. . . . . . . . . . . . . .  13

ARTICLE V      REPRESENTATIONS AND WARRANTIES
               OF THE COMPANY. . . . . . . . . . . . . . . . . . . . . . . .  14
     SECTION 5.1    Organization and Qualification . . . . . . . . . . . . .  14
     SECTION 5.2    Capitalization . . . . . . . . . . . . . . . . . . . . .  14
     SECTION 5.3    Corporate Power and Authority. . . . . . . . . . . . . .  15
     SECTION 5.4    Absence of Certain Changes . . . . . . . . . . . . . . .  16
     SECTION 5.5    SEC Reports. . . . . . . . . . . . . . . . . . . . . . .  17
     SECTION 5.6    Governmental Authorization . . . . . . . . . . . . . . .  18
     SECTION 5.7    Non-Contravention. . . . . . . . . . . . . . . . . . . .  18
     SECTION 5.8    Investment Banking Fees and Commissions. . . . . . . . .  19
     SECTION 5.9    Material Contracts . . . . . . . . . . . . . . . . . . .  19
     SECTION 5.10   Litigation, etc. . . . . . . . . . . . . . . . . . . . .  21
     SECTION 5.11   Benefit Plans. . . . . . . . . . . . . . . . . . . . . .  21
     SECTION 5.12   Intellectual Property. . . . . . . . . . . . . . . . . .  24
     SECTION 5.13   Restrictions on Operations . . . . . . . . . . . . . . .  25
     SECTION 5.14   Environmental Laws . . . . . . . . . . . . . . . . . . .  25
     SECTION 5.15   Compliance with Laws . . . . . . . . . . . . . . . . . .  28
     SECTION 5.16   Taxes. . . . . . . . . . . . . . . . . . . . . . . . . .  28

                                        i

<PAGE>

     SECTION 5.17   Product Registration; 
                    Regulatory Compliance. . . . . . . . . . . . . . . . . .  30
     SECTION 5.18   Company Action . . . . . . . . . . . . . . . . . . . . .  32
     SECTION 5.19   Labor Matters. . . . . . . . . . . . . . . . . . . . . .  32
     SECTION 5.20   Supply . . . . . . . . . . . . . . . . . . . . . . . . .  32

ARTICLE VI     REPRESENTATIONS AND WARRANTIES
               OF PARENT AND MERGER SUB. . . . . . . . . . . . . . . . . . .  33
     SECTION 6.1    Organization and Qualification . . . . . . . . . . . . .  33
     SECTION 6.2    Corporate Power and Authority. . . . . . . . . . . . . .  33
     SECTION 6.3    Governmental Authorization . . . . . . . . . . . . . . .  33
     SECTION 6.4    Non-Contravention. . . . . . . . . . . . . . . . . . . .  34
     SECTION 6.5    Merger Sub . . . . . . . . . . . . . . . . . . . . . . .  34

ARTICLE VII    COVENANTS . . . . . . . . . . . . . . . . . . . . . . . . . .  35
     SECTION 7.1    Conduct of Business. . . . . . . . . . . . . . . . . . .  35
     SECTION 7.2    No Solicitation. . . . . . . . . . . . . . . . . . . . .  38
     SECTION 7.3    Access to Information. . . . . . . . . . . . . . . . . .  40
     SECTION 7.4    Reasonable Best Efforts. . . . . . . . . . . . . . . . .  40
     SECTION 7.5    Indemnification and Insurance. . . . . . . . . . . . . .  41
     SECTION 7.6    State Takeover Statutes. . . . . . . . . . . . . . . . .  43
     SECTION 7.7    Proxy Statement. . . . . . . . . . . . . . . . . . . . .  43
     SECTION 7.8    Company Meeting. . . . . . . . . . . . . . . . . . . . .  43
     SECTION 7.9    Support of Merger. . . . . . . . . . . . . . . . . . . .  44

ARTICLE VIII   CONDITIONS TO CONSUMMATION OF THE MERGER. . . . . . . . . . .  44
     SECTION 8.1    Conditions to Each Party's 
                    Obligation to Effect the Merger. . . . . . . . . . . . .  44

ARTICLE IX     TERMINATION; AMENDMENT; WAIVER. . . . . . . . . . . . . . . .  45
     SECTION 9.1    Termination. . . . . . . . . . . . . . . . . . . . . . .  45
     SECTION 9.2    Effect of Termination. . . . . . . . . . . . . . . . . .  46
     SECTION 9.3    Amendment. . . . . . . . . . . . . . . . . . . . . . . .  46
     SECTION 9.4    Extension; Waiver. . . . . . . . . . . . . . . . . . . .  46

ARTICLE X      MISCELLANEOUS . . . . . . . . . . . . . . . . . . . . . . . .  47
     SECTION 10.1   Non-Survival of Representations 
                    and Warranties . . . . . . . . . . . . . . . . . . . . .  47
     SECTION 10.2   Entire Agreement; Assignment . . . . . . . . . . . . . .  47
     SECTION 10.3   Enforcement of the Agreement . . . . . . . . . . . . . .  47
     SECTION 10.4   Validity . . . . . . . . . . . . . . . . . . . . . . . .  48
     SECTION 10.5   Notices. . . . . . . . . . . . . . . . . . . . . . . . .  48
     SECTION 10.6   Governing Law. . . . . . . . . . . . . . . . . . . . . .  49
     SECTION 10.7   Descriptive Headings . . . . . . . . . . . . . . . . . .  49
     SECTION 10.8   Parties in Interest. . . . . . . . . . . . . . . . . . .  49
     SECTION 10.9   Counterparts . . . . . . . . . . . . . . . . . . . . . .  49
     SECTION 10.10  Fees and Expenses. . . . . . . . . . . . . . . . . . . .  50
     SECTION 10.11  Performance by Merger Sub. . . . . . . . . . . . . . . .  51
     SECTION 10.12  Materiality. . . . . . . . . . . . . . . . . . . . . . .  51
     SECTION 10.13  Subsidiaries Defined . . . . . . . . . . . . . . . . . .  51
     SECTION 10.14  Publicity. . . . . . . . . . . . . . . . . . . . . . . .  51

                                       ii

<PAGE>

                          AGREEMENT AND PLAN OF MERGER


          AGREEMENT AND PLAN OF MERGER, dated as of April 11, 1996, among Pfizer
Inc., a Delaware corporation ("Parent"), HPG ACQUISITION CORP., a Florida
corporation and a wholly-owned subsidiary of Parent ("Merger Sub"), and CORVITA
CORPORATION, a Florida corporation (the "Company").

                              W I T N E S S E T H :

          WHEREAS, the respective Boards of Directors of Parent and Merger Sub
have each determined that it is advisable and in the best interest of Parent and
its stockholders to engage in a transaction whereby Merger Sub will merge with
and into the Company on the terms and subject to the conditions of this
Agreement; and

          WHEREAS, the Board of Directors of the Company has determined that it
is advisable and in the best interest of the Company and its shareholders to
engage in a transaction whereby Merger Sub will merge with and into the Company
on the terms and subject to the conditions of this Agreement; and

          WHEREAS, in furtherance thereof, it is proposed that Merger Sub shall
make a tender offer (the "Offer") to acquire all of the outstanding shares of
common stock, par value $0.001 per share, of the Company (the "Shares"), at a
price of $10.25 per Share (such amount, or any greater amount per share paid
pursuant to the Offer, being hereinafter referred to as the "Offer
Consideration"), net to the sellers in cash, in accordance with the terms and
subject to the conditions provided for herein; and

          WHEREAS, as an inducement and a condition to entering into this
Agreement, Parent required certain shareholders of the Company (the "Selling
Shareholders") to execute and deliver, contemporaneously herewith, an agreement
(the "Shareholders Agreement") providing for certain matters with respect to
their Shares, the tender of their Shares and certain other actions relating to
the Offer, and in order to induce Parent and Merger Sub to enter into this
Agreement, the Company has approved the execution and delivery by Merger Sub and
such shareholders of the Shareholders Agreement; and

<PAGE>

          WHEREAS, the Company, Parent and Merger Sub wish to make certain
representations, warranties, covenants and agreements in connection with the
Merger.

          NOW, THEREFORE, in consideration of the mutual representations,
warranties, covenants and agreements, and upon the terms and subject to the
conditions hereinafter set forth, the parties hereto do hereby agree as follows:


                                    ARTICLE I

                                    THE OFFER

          SECTION 1.1    THE OFFER.  (a)  Provided that this Agreement shall not
have been terminated pursuant to Article IX and none of the events or conditions
set forth in Annex A shall have occurred or be existing, Merger Sub shall, and
Parent shall cause Merger Sub to, commence (within the meaning of Rule 14d-2
under the Securities Exchange Act of 1934, as amended (the "Exchange Act")), the
Offer as promptly as practicable (but in no event later than the fifth business
day from and including the date of the initial public announcement of this
Agreement).  Subject to the terms and conditions of the Offer, Merger Sub shall,
and Parent shall cause Merger Sub to, accept for payment at the Offer
Consideration (and thereby purchase) and pay for all of the Shares that have
been validly tendered and not withdrawn pursuant to the Offer prior to its
expiration date, as it may be extended in accordance with the terms of the Offer
(the "Acceptance Date").  The obligation of Merger Sub to, and of Parent to
cause Merger Sub to, commence the Offer and accept for payment, purchase and pay
for all of the Shares tendered pursuant to the Offer shall be subject to the
conditions set forth in Annex A hereto, including the condition that a number of
Shares representing a majority of all outstanding Shares on a fully diluted
basis (based on the number of Shares outstanding as of the Acceptance Date)
shall have been validly tendered and not withdrawn prior to the expiration date
of the Offer (the "Minimum Condition").  Merger Sub expressly reserves the right
to increase the price per Share payable in the Offer or to make any other
changes in the terms and conditions of the Offer, except without the written
consent of the Company, Merger Sub shall not (i) reduce the number of Shares
sought to be purchased pursuant to the Offer, (ii) reduce the price per Share
payable in the Offer, (iii) change the form of consideration to be paid in the
Offer, (iv) impose additional conditions to the Offer or amend any other term of
the Offer in any 

                                        2

<PAGE>

manner adverse to the holders of Shares or (v) amend or waive satisfaction of
the Minimum Condition.

          (b)  On the date of commencement of the Offer, Parent and Merger Sub
shall file with the Securities and Exchange Commission (the "SEC") a Tender
Offer Statement on Schedule 14D-1 with respect to the Offer which will contain
the offer to purchase and form of the related letter of transmittal (such
Schedule 14D-1 and the documents therein pursuant to which the Offer will be
made, together with any supplements or amendments thereto, collectively, the
"Offer Documents"). Parent and the Company each agrees promptly to correct any
information provided by it for use in the Offer Documents if and to the extent
that it shall have become false or misleading in any material respect and Parent
agrees to take all steps necessary to cause the Offer Documents as so corrected
to be filed with the SEC and be disseminated to holders of Shares, in each case
as and to the extent required by applicable federal securities laws.  Parent and
Merger Sub agree to give the Company and its counsel a reasonable opportunity to
review and comment upon any Offer Document to be filed with the SEC prior to any
such filing and to provide the Company and its counsel in writing with any
comments Parent, Merger Sub or their counsel may receive from the SEC or its
staff with respect to the Offer Documents promptly after the receipt of such
comments.

          (c)  The Offer shall be made by means of an offer to purchase which
shall provide for an initial expiration date of 20 business days from the date
of commencement.  Parent and Merger Sub agree that Merger Sub shall not
terminate or withdraw the Offer or extend the expiration date of the Offer
unless at the expiration date of the Offer the conditions to the Offer shall not
have been satisfied or earlier waived; PROVIDED that notwithstanding the
foregoing, Merger Sub may, without the consent of the Company, extend the Offer
on one occasion following the time that all of the conditions to the Offer have
been satisfied as of the scheduled expiration date of the Offer for a period not
to exceed 10 business days, if the number of Shares tendered, together with any
Shares beneficially owned by Parent or Merger Sub or any other wholly-owned
subsidiary of Parent, is less than 80% of the Shares outstanding on the
scheduled expiration date of the Offer; PROVIDED, FURTHER, that if Merger Sub
elects to extend the Offer as set forth in the immediately preceding proviso,
the obligation of Merger Sub, and of Parent to cause Merger Sub to, accept for
payment, purchase and pay for all of the Shares tendered pursuant to 

                                        3

<PAGE>

the Offer and not withdrawn shall be subject only to the Minimum Condition and
the conditions set forth in Sections 3(A), 3(B) and 3(F) of Annex A.  If at the
expiration date of the Offer, any of the conditions to the Offer shall not have
been satisfied or earlier waived but, in the reasonable belief of Parent, may be
satisfied prior to August 9, 1996, Merger Sub shall extend the expiration date
of the Offer an additional period or periods of time until the earlier of (i)
the date all such conditions are met or waived and Merger Sub becomes obligated
to accept for payment and pay for shares tendered pursuant to the Offer or (ii)
this Agreement is terminated in accordance with its terms.  Notwithstanding
anything to the contrary contained herein, Merger Sub may without the consent of
the Company, extend the Offer so as to comply with applicable rules and
regulations of the SEC.  Any individual extension of the Offer shall be for a
period of no more than 10 business days.

          SECTION 1.2    COMPANY ACTION.  (a)  The Company hereby approves of
and consents to the Offer at the Offer Consideration and represents and warrants
that the Company's Board of Directors, at a meeting duly called and held, has,
subject to the terms and conditions set forth herein, (i) determined that this
Agreement and the transactions contemplated hereby, including the Offer at the
Offer Consideration and the Merger, are fair to, and in the best interests of,
the shareholders of the Company, (ii) approved this Agreement and the
Shareholders Agreement, the Offer at the Offer Consideration and the Merger, in
all respects, including for purposes of Section 1103 of the Florida 1989
Business Corporation Act (the "BCA"), and (iii) resolved to recommend that the
shareholders of the Company accept the Offer, tender their Shares thereunder at
the Offer Consideration to Merger Sub and approve and adopt this Agreement and
the Merger.  The Company consents to the inclusion of such recommendation and
approval in the Offer Documents.  The Company further represents that Dillon,
Read & Co. Inc., the Company's financial advisor ("Dillon Read"), has delivered
to the Company's Board of Directors the written opinion of Dillon Read that the
Offer Consideration to be received by the shareholders of the Company pursuant
to the Offer and the Merger is fair from a financial point of view to such
shareholders.  

          (b)  The Company hereby agrees, subject to the terms and conditions
set forth herein, to file as promptly as practicable (and after affording Parent
and its counsel a reasonable opportunity to review and comment thereon) with 

                                        4

<PAGE>

the SEC a Solicitation/Recommendation Statement on Schedule 14D-9 (such Schedule
14D-9 together with any amendments or supplements thereto, the "Schedule 14D-9")
containing the recommendations described in Section 1.2(a) and to mail the
Schedule 14D-9 to the shareholders of the Company concurrently with the
commencement of the Offer.  Each of the Company, Parent and Merger Sub agrees
promptly to correct any information provided by it for use in the Schedule 14D-9
if and to the extent that it shall have become false or misleading in any
material respect and the Company further agrees to take all steps necessary to
cause the Schedule 14D-9 as so corrected to be filed with the SEC and
disseminated to the holders of Shares, in each case as and to the extent
required by applicable federal securities laws.  Notwithstanding anything to the
contrary in this Agreement, the recommendations referred to in Section 1.2(a)
and the Schedule 14D-9 may be withdrawn, modified or amended if the Board of
Directors of the Company, after consultation with and based upon the advice of
independent legal counsel (who may be the Company's regularly engaged
independent legal counsel), determines in good faith that the failure to take
such action could create a reasonable possibility of a breach by the Board of
Directors of the Company of its fiduciary duties to shareholders under
applicable law.

          (c)  In connection with the Offer, the Company shall cause its
transfer agent to furnish Merger Sub promptly with mailing labels, securities
position listings and any available listing or computer file containing the
names and addresses of the record holders of the Shares as of a recent date and
shall furnish Merger Sub with such additional information and assistance
(including, without limitation, updated lists of shareholders, mailing labels
and lists of securities positions) as Merger Sub or its agents may reasonably
request in communicating the Offer to the record and beneficial holders of
Shares.  Subject to the requirements of applicable law, and except for such
steps as are necessary to disseminate the Offer Documents and any other
documents necessary to consummate the Merger, Parent and Merger Sub shall hold
in confidence the information contained in any of such lists or labels and the
additional information referred to in the preceding sentence, will use the
information contained in any such labels, listings and files only in connection
with the Offer and the Merger and, if this Agreement shall be terminated, will
deliver to the Company all copies of such information then in their possession.

                                        5

<PAGE>

          SECTION 1.3    DIRECTORS.  (a)  Promptly upon the purchase pursuant to
the Offer by Parent or Merger Sub of such number of Shares which represents a
majority of all outstanding Shares on a fully diluted basis, Parent shall be
entitled to designate the number of directors, rounded up to the next whole
number, on the Company's Board of Directors that equals the product of (i) the
total number of directors on the Company's Board of Directors (giving effect to
the election of any additional directors pursuant to this Section) and (ii) the
percentage (expressed as a decimal) that the number of Shares beneficially owned
by Parent bears to the total number of Shares outstanding, and the Company
shall, subject to compliance with Section 14(f) of the Exchange Act and Rule
14f-1 promulgated thereunder, take all action necessary to cause Parent's
designees to be elected or appointed to the Company's Board of Directors,
including, without limitation, increasing the number of directors or seeking and
accepting resignations of incumbent directors.   Notwithstanding the foregoing,
until the Effective Time (as defined in Section 2.2) the Company shall be
entitled to retain as members of its Board of Directors at least two directors
who are directors of the Company on the date hereof, subject to their
availability and willingness to serve.  The date on which Parent's designees
constitute a majority of the Company's board of directors is referred to as the
"Control Date."

          (b)  The Company shall promptly take all actions required pursuant to
Section 14(f) and Rule 14f-1 in order to fulfill its obligations under this
Section 1.3 and shall include in the Schedule 14D-9 such information with
respect to the Company and its officers and directors as is required under
Section 14(f) and Rule 14f-1 in order to fulfill its obligations under this
Section 1.3.  Parent will supply to the Company in writing and be solely
responsible for any information with respect to itself and its nominees,
officers, directors and affiliates required by Section 14(f) and Rule 14f-1.

          (c)  From and after the time, if any, that Parent's designees
constitute a majority of the Company's Board of Directors pursuant to this
Section 1.3 and prior to the Effective Time, any amendment of this Agreement,
any termination of this Agreement by the Company, any extension of time for
performance of any of the obligations of Parent or Merger Sub hereunder or any
waiver thereof, any waiver of any condition to the obligations of the Company or
any of the Company's rights hereunder or other action by the Company hereunder
will require the concurrence of, and shall 

                                        6

<PAGE>

be effective only if approved by a majority of the directors of the Company then
in office who are not affiliates of Parent and were not designated by Parent
(the "Company Designees"), which action shall be deemed to constitute the action
of the full Board of Directors even if such majority of the Company Designees
does not constitute a majority of all directors then in office; provided, that,
if there shall be no Company Designees, such actions may be effected by majority
vote of the entire Board of Directors except that no such action shall amend the
terms of this Agreement in a manner adverse to the shareholders of the Company.


                                   ARTICLE II

                                   THE MERGER

          SECTION 2.1    THE MERGER.  Upon the terms and subject to the
conditions hereof, and pursuant to Section 1103 of the BCA, Merger Sub shall be
merged with and into the Company (the "Merger") at the Effective Time. Following
the Merger, the Company shall continue as the surviving corporation (the
"Surviving Corporation") under the name of "Corvita Corporation," and the
separate corporate existence of Merger Sub shall cease.

          SECTION 2.2    EFFECTIVE TIME.  On the date of the Closing (as defined
in Section 2.3), the Surviving Corporation will cause articles of merger
substantially in the form of Exhibit A attached hereto (the "Articles of
Merger") to be executed and filed with the Secretary of State of the State of
Florida as provided in Section 1105 of the BCA.  The Merger shall become
effective (i) at the time and date which the Articles of Merger are filed with
the Secretary of State of the State of Florida or (ii) such other time as is
agreed upon by the parties and specified in the Articles of Merger (such time as
the Merger becomes effective is hereinafter referred to as the "Effective
Time").

          SECTION 2.3    CLOSING.  The closing of the Merger (the "Closing")
shall take place (i) at the offices of Weil, Gotshal & Manges LLP, 767 Fifth
Avenue, New York, New York, as promptly as practicable following the date on
which the last of the conditions set forth in Article VIII is satisfied or
waived in accordance with the terms of this Agreement, which date shall in any
event not be later than the third business day following the satisfaction or
waiver of the last of such conditions, or (ii) at such other place 

                                        7

<PAGE>

and/or on such other date as Parent and the Company may agree.

          SECTION 2.4    EFFECTS OF THE MERGER.  The Merger shall have the
effects set forth in the BCA.  As of the Effective Time, Parent shall own all of
the issued and outstanding common stock of the Surviving Corporation.

          SECTION 2.5    ARTICLES OF INCORPORATION AND BYLAWS.  At the Effective
Time, the Company's Articles of Incorporation and Bylaws shall be the Articles
of Incorporation and Bylaws of the Surviving Corporation.

          SECTION 2.6    DIRECTORS AND OFFICERS.  The directors of Merger Sub at
the Effective Time shall become the directors of the Surviving Corporation until
their successors are duly elected and qualified.  At the Effective Time, the
persons listed on Schedule 2.06 shall become the officers of the Surviving
Corporation until their successors are duly elected and qualified.

          SECTION 2.7    MERGER WITHOUT MEETING OF SHAREHOLDERS. Notwithstanding
anything to the contrary contained herein, if Parent, directly or indirectly
through Merger Sub or any other wholly-owned subsidiary, acquires at least 80%
of the outstanding Shares, each of Parent, Merger Sub and the Company shall take
all necessary and appropriate action to cause the Merger to become effective, as
soon as practicable after the consummation of the Offer, without a meeting of
shareholders of the Company, in accordance with Section 1104 of the BCA.


                                   ARTICLE III

                       EFFECT OF THE MERGER ON THE CAPITAL
                      STOCK OF THE CONSTITUENT CORPORATIONS

          SECTION 3.1    EFFECT ON CAPITAL STOCK.  At the Effective Time, by
virtue of the Merger and without any action on the part of the holder thereof:

               (a)  Each Share issued and outstanding immediately prior to the
Effective Time (excluding Shares owned, directly or indirectly, by the Company
or any subsidiary of the Company or by Parent, Merger Sub or any other
subsidiary of Parent and Dissenting Shares (as defined in Section 4.3)) shall be
converted into the right to receive the Offer Consideration (the "Merger

                                        8

<PAGE>

Consideration"), without interest thereon, upon surrender of the certificate
formerly representing such Share, less any required withholding of taxes.

               (b)  All Shares, when converted as provided in Section 3.1(a), no
longer shall be outstanding and shall automatically be cancelled and retired and
cease to exist, and each holder of a certificate representing any such Shares
shall thereafter cease to have any rights with respect to such Shares, except
the right to receive for each of such Shares, upon the surrender of such
certificate in accordance with Section 4.1, the Merger Consideration specified
in Section 3.1(a) above.

               (c)  Each Share issued and outstanding immediately prior to the
Effective Time owned by Parent or any direct or indirect wholly-owned subsidiary
of Parent shall cease to be outstanding, be cancelled and retired without
payment of any consideration therefor and cease to exist.

               (d)  Each Share issued and held immediately prior to the
Effective Time in the Company's treasury or by any of the Company's direct or
indirect wholly-owned subsidiaries shall be cancelled and retired without
payment of any consideration therefor and cease to exist.

               (e)  Each share of common stock, par value $0.001 per share, of
Merger Sub issued and outstanding immediately prior to the Effective Time shall
be converted into one issued and outstanding share of common stock, par value
$0.001 per share, of the Surviving Corporation.

          SECTION 3.2    STOCK OPTIONS; WARRANTS.  Immediately after the
Acceptance Date, each holder of a then outstanding option to purchase Shares
(collectively, the "Options") under the Company's 1988 Stock Option Plan, the
Company's 1995 Stock Option Plan and the Company's Non-Employee Director Stock
Option Plan (collectively, the "Stock Option Plans"), whether or not then
exercisable or fully vested, and each holder of the warrants to purchase an
aggregate of 491,699 Shares issued to certain parties (collectively, the
"Warrants"), shall, in settlement thereof, be entitled to receive from the
Company for each Share subject to such Option, or Warrant, an amount (net of any
applicable withholding tax) in cash equal to the difference between the Offer
Consideration and the per Share exercise 

                                        9

<PAGE>

price of such Option, or Warrant, to the extent the Offer Consideration is
greater than the per Share exercise price of such Option or Warrant (such excess
amount with respect to Options being hereinafter referred to as the "Option
Consideration", and such amount with respect to the Warrants being hereinafter
referred to as the "Warrant Consideration"); PROVIDED, HOWEVER, that with
respect to any person subject to Section 16(a) of the Exchange Act, any such
amount shall be paid as soon as practicable after the first date payment can be
made without liability to such person under Section 16(b) of the Exchange Act.
Prior to the Acceptance Date, the Company shall use its reasonable efforts to
obtain all necessary consents or releases from holders of Options under the
Stock Option Plans, and holders of Warrants, and take any such other action as
may be reasonably necessary to give effect to the transactions contemplated by
this Section 3.02 (except for such action that may require the approval of the
Company's shareholders) and to otherwise cause each Option, and each Warrant, to
be surrendered to the Company and cancelled, whether or not any Option
Consideration or Warrant Consideration is payable with respect thereto, at the
Acceptance Date.  The surrender of an Option, or Warrant, to the Company shall
be deemed a release of any and all rights the holder had or may have had in such
Option, or Warrant, other than the right to receive the Option Consideration or
Warrant Consideration.  If necessary, Parent shall cause the Company to be
provided with sufficient funds to make the payments required by this Section
3.2.


                                   ARTICLE IV

                                PAYMENT OF SHARES

          SECTION 4.1    PAYMENT FOR SHARES.  (a)  Prior to the commencement of
the Offer, (i) Merger Sub shall appoint a United States bank or trust company
mutually acceptable to the Company and Parent to act as paying agent (the
"Paying Agent") for the payment of the Offer Consideration and the Merger
Consideration, and (ii) Parent shall deposit or shall cause to be deposited with
the Paying Agent in a separate fund established for the benefit of the holders
of Shares, for payment in accordance with this Article IV, through the Paying
Agent (the "Payment Fund"), immediately available funds in amounts necessary to
make the payments pursuant to the Offer, Section 3.1(a) and this Section 4.1 to
holders (other than the Company or any subsidiary of the Company or Parent,
Merger Sub or any other subsidiary of Parent, or holders of Dissenting Shares).
The 

                                       10

<PAGE>

Paying Agent shall pay the Offer Consideration and the Merger Consideration out
of the Payment Fund.

          From time to time at or after the Effective Time Parent shall take all
lawful action necessary to make the appropriate cash payments, if any, to
holders of Dissenting Shares.  Prior to the Effective Time, Parent shall enter
into appropriate commercial arrangements to ensure effectuation of the
immediately preceding sentence.  The Paying Agent shall invest portions of the
Payment Fund as Parent directs in obligations of or guaranteed by the United
States of America, in commercial paper obligations receiving the highest
investment grade rating from both Moody's Investors Services, Inc. and Standard
& Poor's Corporation, or in certificates of deposit, bank repurchase agreements
or banker's acceptances of commercial banks with capital exceeding
$1,000,000,000 (collectively, "Permitted Investments"); PROVIDED, HOWEVER, that
the maturities of Permitted Investments shall be such as to permit the Paying
Agent to make prompt payment to former holders of Shares entitled thereto as
contemplated by this Section.  Parent shall cause the Payment Fund to be
promptly replenished to the extent of any losses incurred as a result of
Permitted Investments.  All earnings on Permitted Investments shall be paid to
Parent.  If for any reason (including losses) the Payment Fund is inadequate to
pay the amounts to which holders of Shares shall be entitled under this Section
4.1, Parent shall in any event be liable for payment thereof.  The Payment Fund
shall not be used for any purpose except as expressly provided in this
Agreement.

          (b)  As soon as reasonably practicable after the Effective Time,
Parent shall instruct the Paying Agent to mail to each holder of record (other
than the Company or any subsidiary of the Company or Parent, Merger Sub or any
other subsidiary of Parent) of a Certificate or Certificates which, immediately
prior to the Effective Time, evidenced outstanding Shares (the "Certificates"),
(i) a form of letter of transmittal (which shall specify that delivery shall be
effected, and risk of loss and title to the Certificates shall pass, only upon
proper delivery of the Certificates to the Paying Agent, and shall be in such
form and have such other provisions as Parent reasonably may specify) and
(ii) instructions for use in effecting the surrender of the Certificates in
exchange for payment therefor.  Upon surrender of a Certificate for cancellation
to the Paying Agent together with such letter of transmittal, duly executed, and
such other customary documents as may be required pursuant to such instructions,

                                       11

<PAGE>

the holder of such Certificate shall be entitled to receive in respect thereof
cash in an amount equal to the product of (x) the number of Shares represented
by such Certificate and (y) the Merger Consideration, and the Certificate so
surrendered shall forthwith be canceled.  No interest shall be paid or accrued
on the Merger Consideration payable upon the surrender of any Certificate.  If
payment is to be made to a person other than the person in whose name the
surrendered Certificate is registered, it shall be a condition of payment that
the Certificate so surrendered shall be promptly endorsed or otherwise in proper
form for transfer and that the person requesting such payment shall pay any
transfer or other taxes required by reason of the payment to a person other than
the registered holder of the surrendered Certificate or established to the
satisfaction of the Surviving Corporation that such tax has been paid or is not
applicable.  Until surrendered in accordance with the provisions of this Section
4.1, each Certificate (other than Certificates representing Shares owned by
Parent or any subsidiary of Parent or held in the treasury of the Company) shall
represent for all purposes only the right to receive the Merger Consideration,
subject to Section 4.3.

          (c)  Any portion of the Payment Fund which remains undistributed to
the holders of Shares for one year after the Effective Time shall be delivered
to Parent, upon demand, and any holders of Shares who have not theretofore
complied with this Article IV and the instructions set forth in the letter of
transmittal mailed to such holder after the Effective Time shall thereafter look
only to Parent for payment of the Merger Consideration to which they are
entitled.  All interest accrued in respect of the Payment Fund shall inure to
the benefit of and be paid to Parent.

          (d)  Neither Parent nor the Surviving Corporation shall be liable to
any holder of Shares for any cash from the Payment Fund delivered to a public
official pursuant to any applicable abandoned property, escheat or similar law.

          (e)  Parent shall be entitled to deduct and withhold from the
consideration otherwise payable pursuant to this Agreement to any holder of
Shares such amounts as Parent is required to deduct and withhold with respect to
the making of such payment under the Code, or any provision of state, local or
foreign tax law.  To the extent that amounts are so withheld by Parent, such
withheld amounts shall be treated for all purposes of this Agreement as having
been paid to the holder of the Shares in respect of which such deduction and
withholding was made by Parent.

                                       12

<PAGE>

          SECTION 4.2    STOCK TRANSFER BOOKS.  At the Effective Time, the stock
transfer books of the Company shall be closed and there shall be no further
registration of transfers of Shares thereafter on the records of the Company. On
or after the Effective Time, any Certificates presented to the Paying Agent or
Parent for any reason shall be converted into the Merger Consideration.

          SECTION 4.3    DISSENTING SHARES.  Notwithstanding any other
provisions of this Agreement to the contrary, Shares that are outstanding
immediately prior to the Effective Time and which are held by shareholders who
shall have not voted in favor of the Merger or consented thereto in writing and
who shall have demanded properly in writing appraisal for such shares in
accordance with Section 1320 of the BCA (collectively, the "Dissenting Shares")
shall not be converted into or represent the right to receive the Merger
Consideration.  Such shareholders instead shall be entitled to receive payment
of the appraised value of such Shares held by them in accordance with the
provisions of such Section 1320, except that all Dissenting Shares held by
shareholders who shall have failed to perfect or who effectively shall have
withdrawn or lost their rights to appraisal of such Shares under such Section
1320 shall thereupon be deemed to have been converted into and to have become
exchangeable, as of the Effective Time, for the right to receive, without any
interest thereon, the Merger Consideration upon surrender in the manner provided
in Section 4.1, of the Certificate or Certificates that, immediately prior to
the Effective Time, evidenced such Shares.

          SECTION 4.4    RIGHT TO MERGER CONSIDERATION.  Subject to Section 4.3,
until surrendered and exchanged in accordance with Section 4.1, each Certificate
shall, after the Effective Time, represent solely the right to receive promptly
upon surrender in accordance with the provisions of Section 4.1 the Merger
Consideration and shall have no other rights, including voting rights.  Subject
to Section 4.3, from and after the Effective Time, Parent shall be entitled to
treat any Certificates that have not yet been surrendered for exchange as
evidencing only the ownership of the aggregate Merger Consideration into which
the Shares represented by such Certificates shall have been converted
notwithstanding any failure to surrender such Certificates.

                                       13

<PAGE>

                                    ARTICLE V

                         REPRESENTATIONS AND WARRANTIES
                                 OF THE COMPANY

          The Company represents and warrants to the Parent and Merger Sub as
follows:

          SECTION 5.1    ORGANIZATION AND QUALIFICATION.  (a)  The Company is a
corporation duly organized, validly existing and in good standing under the laws
of the State of Florida and has all requisite corporate power and authority to
carry on its business as it is now being conducted.

               (b)  The only direct and indirect subsidiaries of the Company are
those named in Schedule 5.01 to the Disclosure Statement relating hereto, which
Disclosure Statement has been delivered to Parent simultaneously herewith (the
"Disclosure Statement").  Each subsidiary of the Company is a corporation duly
organized, validly existing and in good standing under the laws of the
jurisdiction of its incorporation and has all requisite corporate power and
authority to carry on its business as it is now being conducted.  Each of the
Company and its subsidiaries is duly qualified as a foreign corporation and is
in good standing in each jurisdiction in which the property owned, leased or
operated by it or the nature of the business conducted by it makes such
qualification necessary, except where the failure to be so qualified would not
in the aggregate have a Material Adverse Effect (as defined below).  For
purposes of this Agreement, "Material Adverse Effect" shall mean any adverse
change in or effect on the condition (financial or otherwise), business, assets
or results of operations of the Company and its subsidiaries that is material to
the Company and its subsidiaries taken as a whole.

          SECTION 5.2    CAPITALIZATION.  (a)  The authorized capital stock of
the Company consists of 23,750,000 shares, of which 18,750,000 shares are common
stock, par value of $0.001 per share, and 5,000,000 shares are Series Preferred
Stock, par value of $0.001 per share (the "Company Preferred Stock").  Schedule
5.2 of the Disclosure Statement sets forth a true, correct and complete list of
all outstanding Options (including a list of the persons to whom such Options
have been granted) and Warrants (including a list of the persons and entities to
which such Warrants have been issued).  At the close of business on April 4,
1996, 7,106,149 Shares were issued and outstanding, 

                                       14

<PAGE>

no shares of Company Preferred Stock were issued and outstanding, and 808,636
Shares were reserved for issuance pursuant to the Stock Option Plans and 491,699
Shares were reserved for issuance pursuant to the Warrants.  Except as set forth
in the preceding sentence and Schedule 5.2 of the Disclosure Statement, there
are not as of the date hereof, and, except as provided in Section 3.2 and
Schedule 5.2 of the Disclosure Statement, at the Effective Time there will not
be, any outstanding or authorized subscriptions, options, warrants, calls,
rights, commitments or any other agreements of any character obligating the
Company to issue any additional Shares or any other shares of capital stock of
the Company or any other securities convertible into, exchangeable, exercisable
or evidencing the right to subscribe for any such shares.  All of the
outstanding shares of capital stock of the Company have been duly authorized and
validly issued and are fully paid and nonassessable and free of preemptive
rights.  

               (b)  The number of outstanding shares of capital stock of each of
the subsidiaries of the Company, owned of record and beneficially by the
Company, is set forth in Schedule 5.01 to the Disclosure Statement.  The
Company, or a wholly-owned subsidiary of the Company, is the sole record and
beneficial owner of the issued and outstanding capital stock of each subsidiary
listed in Schedule 5.01 to the Disclosure Statement, except as otherwise set
forth in such Schedule.  There are no irrevocable proxies with respect to such
shares, and, except as set forth in Schedule 5.01 to the Disclosure Statement,
no equity securities of any of such subsidiaries are or may become required to
be issued by reason of any options, warrants, rights to subscribe for, calls or
commitments of any character whatsoever relating to, or securities or rights
convertible into or exchangeable for, shares of any capital stock of any such
subsidiary, and there are no contracts, commitments, understandings or
arrangements by which any such subsidiary is bound to issue additional shares of
its capital stock or securities convertible into or exchangeable for such
shares.  All of such shares so owned by the Company or a wholly-owned subsidiary
of the Company are validly issued, fully paid and nonassessable and are owned by
it free and clear of all Liens (as defined in Section 5.7).

          SECTION 5.3    CORPORATE POWER AND AUTHORITY.  The Company has full
corporate power and authority to execute and deliver this Agreement and, subject
to any required approval of the Company's shareholders, to consummate

                                       15

<PAGE>

the transactions contemplated hereby.  The execution and delivery of this
Agreement by the Company and the consummation by the Company of the transactions
contemplated hereby have been duly authorized by, and the Shareholders Agreement
has been approved by, the Board of Directors of the Company and other than the
approval of this Agreement and the Merger by the holders of a majority of the
outstanding Shares, no other corporate proceedings on the part of the Company
are necessary to authorize this Agreement or to consummate the transactions so
contemplated.  This Agreement has been duly and validly executed and delivered
by the Company and, assuming this Agreement constitutes a valid and binding
obligation of each of Parent and Merger Sub, this Agreement constitutes the
legal, valid and binding obligation of the Company, enforceable against it in
accordance with its terms, subject to bankruptcy, insolvency, fraudulent
conveyance, reorganization, moratorium and similar laws, now or hereafter in
effect, affecting creditors' rights and remedies and to general principles of
equity.
 
          SECTION 5.4    ABSENCE OF CERTAIN CHANGES.  Except as disclosed in the
Company's SEC Reports (as defined in Section 5.5) under the Exchange Act, since
December 31, 1995, the Company and its subsidiaries have not suffered
any Material Adverse Effect.  Except as disclosed in the Company's SEC Reports
under the Exchange Act or in writing to Parent by the Company prior to execution
of this Agreement, or as otherwise set forth in this Agreement or the Disclosure
Statement, since December 31, 1995, there has not been (a) any declaration,
setting aside or payment of any dividend or other distribution in respect of the
Shares, or any redemption or other acquisition by the Company of any shares of
its capital stock; (b) any increase in the rate or terms of compensation payable
or to become payable by the Company to its directors, officers or key employees,
except increases occurring in the ordinary course of business consistent with
past practices; (c) any increase in the rate or terms of any bonus, insurance,
pension or other employee benefit plan, payment or arrangement made to, for or
with any such directors, officers or employees, except increases occurring in
the ordinary course of business consistent with past practices; (d) any entry
into any agreement, commitment or transaction by the Company which is material
to the Company and its subsidiaries taken as a whole, except for agreements,
commitments or transactions in the ordinary course of business; (e) any
amendment, termination or lapse of a material contract of the Company and its
subsidiaries, taken as a whole; (f) any material labor dispute involving 

                                       16

<PAGE>

the employees of the Company or its subsidiaries; (g) any change by the Company
in accounting methods, principles or practices except as required or permitted
by generally accepted accounting principles; (h) any write-off or write-down of,
or any determination to write-off or write-down, any asset of the Company or any
of its subsidiaries or any portion thereof which write-off, write-down, or
determination exceeds $10,000 individually or $30,000 in the aggregate; (i) any
amendment, termination, waiver, disposal, or lapse of, or other failure to
preserve, any license, permit, or other form of authorization of the Company or
any subsidiary, except for any thereof that would not have a Material Adverse
Effect; or (j) any agreements by the Company to (1) do any of the things
described in the preceding clauses (a) through (i) other than as expressly
contemplated or provided for herein or (2) take, whether in writing or
otherwise, any action which, if taken prior to the date of this Agreement, would
have made any representation or warranty of the Company in this Agreement untrue
or incorrect.

          SECTION 5.5    SEC REPORTS.  (a)  The Company has filed all required
forms, reports and documents with the SEC required to be filed by it pursuant to
the Federal securities laws and the SEC rules and regulations thereunder, all of
which have complied as of their respective filing dates, or, in the case of
registration statements, their respective effective dates, in all material
respects with all applicable requirements of the Securities Act of 1933, as
amended (the "Securities Act"), and the Exchange Act, and the rules and
regulations promulgated thereunder.  None of such forms, reports or documents,
including, without limitation, any exhibits, financial statements or schedules
included therein, at the time filed, or, in the case of registration statements,
their respective effective dates, contained any untrue statement of a material
fact or omitted to state a material fact required to be stated therein or
necessary in order to make the statements therein, in light of the circumstances
under which they were made, not misleading.  All forms, reports and documents
filed by the Company with the SEC are hereinafter collectively referred to as
the "SEC Reports".

               (b)  The consolidated balance sheets and the related consolidated
statements of operations, stockholders' equity (deficit) and cash flows
(including, without limitation, the related notes thereto) of the Company
included in the Company's Annual Report on Form 10-K for the fiscal years ended
June 30, 1994 and 1995 and the 

                                       17

<PAGE>

Company's Quarterly Reports on Form 10-Q for the quarters ended September 30,
1995 and December 31, 1995 complied as to form, at the time filed, in all
material respects with generally accepted accounting principles and the
published rules and regulations of the SEC with respect thereto at the time
filed and present fairly (subject to normal nonrecurring audit adjustments in
the case of unaudited interim financial statements) the consolidated financial
position of the Company as of their respective dates, and the results of
consolidated operations, the stockholders' equity (deficit) and the cash flows
for the periods presented therein, all in conformity with generally accepted
accounting principles applied on a consistent basis, except as otherwise noted
therein.

          SECTION 5.6    GOVERNMENTAL AUTHORIZATION.  The execution, delivery
and performance by the Company of this Agreement and the consummation of the
transactions contemplated hereby by the Company require no action by the Company
in respect of, or filing with, any governmental body, agency, official or
authority other than (i) the filing with the SEC of such reports and information
as may be required in connection with this Agreement and the transactions
contemplated hereby pursuant to the applicable requirements of the Securities
Act, the Exchange Act and the rules and regulations promulgated thereunder,
(ii) the filing of the Articles of Merger in accordance with the BCA, and, if
necessary, appropriate documents with the relevant authorities of other states
in which the Company is qualified to do business, (iii) such filings,
authorizations, orders and approvals as may be required under foreign laws and
(iv) compliance with any applicable requirements of the Hart-Scott-Rodino
Antitrust Improvements Act of 1976 (the "HSR Act"), except for filings and
approvals which are not required prior to the consummation of the Merger or
where the failure of any such action to be taken or filing to be made would not
have or reasonably be expected to have, individually or in the aggregate, a
Material Adverse Effect or prevent the consummation of the transactions
contemplated hereby.

          SECTION 5.7    NON-CONTRAVENTION.  The execution, delivery and
performance by the Company of this Agreement and the consummation of the
transactions contemplated hereby by the Company do not and will not
(i) contravene or conflict with the Company's Amended and Restated Articles of
Incorporation (the "Company's Articles of Incorporation") or Bylaws,
(ii) assuming compliance with the matters referred to in Section 5.6, contravene
or conflict with or constitute 

                                       18

<PAGE>

a violation of any provision of any law, regulation, judgment, injunction, order
or decree binding upon or applicable to the Company or any of its subsidiaries,
(iii) assuming that the Company, Parent and Merger Sub comply in all respects
with the applicable provisions of the Securities Act and the Exchange Act and
the rules and regulations thereunder, in each case, as more fully described in
Section 5.6, except as disclosed in the SEC Reports or in Schedule 5.07 to the
Disclosure Schedule, constitute or result in a default under or give rise to a
right of termination, cancellation or acceleration of any right or obligation,
including without limitation, a repurchase obligation, of the Company or any of
its subsidiaries or to a loss of any benefit to which the Company or any of its
subsidiaries is entitled under any provision of any agreement or other
instrument binding upon the Company or any of its subsidiaries or any license,
franchise, permit or other similar authorization held by the Company or any of
its subsidiaries, or (iv) result in the creation or imposition of any Lien (as
defined below) on any asset of the Company or any of its subsidiaries, other
than, in the case of clauses (ii), (iii) or (iv), any such conflicts,
violations, defaults, losses and Liens that individually or in the aggregate
would not have a Material Adverse Effect.  For purposes of this Agreement,
"Lien" means, with respect to any asset, any mortgage, lien, pledge, charge,
security interest, encumbrance, restriction or adverse claim of any kind or
nature in respect of such asset, other than any such mortgage, lien, pledge,
charge, security interest, encumbrance, restriction or adverse claim (i) for
taxes or other governmental charges not yet due and payable, (ii) materialmen's,
mechanic's and similar liens or (iii) reflected on the consolidated balance
sheets of the Company as of September 30, 1995 and December 31, 1995 or (iv) on
any of the Company's properties or assets, or irregularities in title thereto,
that do not materially detract from the value of, or materially impair the use
of, any such property or asset.

          SECTION 5.8    INVESTMENT BANKING FEES AND COMMISSIONS.  Except for
those fees and expenses payable to Dillon Read with respect to the Company, no
person or entity is entitled to receive from the Company or any of its
subsidiaries any investment banking, brokerage or finder's fee in connection
with this Agreement or the transactions contemplated hereby.

          SECTION 5.9    MATERIAL CONTRACTS.  (a) Except as disclosed in the
Company's SEC Reports or on Schedule 5.09 

                                       19
<PAGE>

to the Disclosure Statement, neither the Company nor any of its subsidiaries is
a party to any (i) contract or agreement not made in the ordinary course of
business or which is not terminable without penalties of $50,000 or more in the
aggregate or upon notice of thirty (30) days or less; (ii) employment,
consulting, non-competition, severance, golden parachute or indemnification
contract or agreement; (iii) mortgage, pledge, conditional sales contract,
security agreement, loan agreement, credit agreement, promissory note or other
similar contract with respect to any real property of the Company or any of its
subsidiaries; (iv) mortgage pledge, conditional sales contract, security
agreement, factoring agreement, loan agreement, credit agreement, promissory
note or other similar contract with respect to any tangible personal property of
the Company or any of its subsidiaries involving indebtedness for borrowed money
or capital equipment leases, in each case, of more than $50,000; (v) guarantee,
subordination agreement, letter of credit or any other similar type of contract
or agreement involving obligations in excess of $50,000 individually or $50,000
in the aggregate; (vi) contract or agreement with any governmental authority
other than any such contract or agreement which is terminable without penalties
of $50,000 or more in the aggregate or upon notice of 30 days or less, which
involves obligations or indebtedness in excess of $50,000 individually or in the
aggregate, or which requires performance by the Company or any of its
subsidiaries that is not scheduled, and reasonably expected to be completed,
within 30 days from the date hereof; or (vii) commitment or agreement to enter
into any of the foregoing.  The Company has delivered or otherwise made
available to Parent true, correct and complete copies of the contracts and
agreements listed on Schedule 5.09 to the Disclosure Statement, together with
all amendments, modifications, supplements or material side letters affecting
the obligations of any party thereunder.  Neither the Company nor any of its
subsidiaries is in default under any such contract or agreement nor, to the
Company's knowledge, is any other party thereto in default, which default, in
each case, could reasonably be expected to have a Material Adverse Effect.  

          (b)  (i) The Company and Sumitomo Bakelite Co, Ltd., a Japanese
corporation ("Sumitomo"), have entered into the License Termination Agreement,
dated as of December 21, 1995, terminating the License Agreement, dated as of
June 19, 1990, between the Company and Sumitomo (the "License Termination
Agreement"), (ii) Corvita Europe, S.A., a Belgian corporation and a wholly-owned
subsidiary of the Company ("Corvita Europe"), Jean Pierre Dereume and

                                       20

<PAGE>

L'Universite Libre Bruxelles have entered into the Patent License Agreement,
dated as of January 24, 1996 (the "Patent License Agreement"), (iii) the Company
has entered into a Stock Purchase Agreement of even date herewith, with the
shareholders of Cardiovascular Innovations Canada, Inc. ("Cardiovascular
Innovations") and with Research Visions Canada, Inc. providing for the purchase
by the Company, directly or indirectly (by purchase of all of the shares of
Cardiovascular Innovations) of all of the shares of Corvita Canada, Inc. that it
does not presently own (the "Stock Purchase Agreements"), (iv) Vascor, Inc.
("Vascor") has executed, as of April 9, 1996, a Consent to Assignment of the
License and Supply Agreement between Vascor and the Company (the "Supply
Agreement") and (v) The Polymer Technology Group and the Company have entered
into a License Agreement, dated April 9, 1996 (the "PTG Agreement" and, together
with the License Termination Agreement, the Patent License Agreement and the
Supply Agreement, the "Material Agreements"), and each such agreement is in full
force and effect and there has been no material breach by the Company or the
other party thereto that has not been cured.

          SECTION 5.10   LITIGATION, ETC.  As of the date hereof, except as
disclosed in the SEC Reports or in Schedule 5.10 to the Disclosure Statement,
there is no suit, claim, action or proceeding (at law or in equity) pending nor,
to the knowledge of the Company, is any investigation pending or any suit,
claim, action, or proceeding threatened against the Company or any of its
subsidiaries before any court or governmental or regulatory authority or body
seeking money damages in excess of $50,000 or non-monetary relief that, if
granted, could reasonably be expected to have a Material Adverse Effect or
seeking to prevent or challenging the transactions contemplated by this
Agreement.  The Company is not subject to any outstanding order, writ,
injunction or decree that would have a Material Adverse Effect.

          SECTION 5.11   BENEFIT PLANS.  (a)  Schedule 5.11 to the Disclosure
Statement contains a true and complete list of each "employee benefit plan" (as
defined in Section 3(3) of the Employee Retirement Income Security Act of 1974,
as amended ("ERISA"), including foreign plans which would be subject to ERISA if
such plans covered U.S. employees, bonus, deferred compensation, incentive
compensation, excess benefit, supplemental retirement, stock purchase, stock
option, severance, life insurance, disability, salary continuation, supplemental
unemployment and other employee benefit plan, program or arrangement whether
written or 

                                       21

<PAGE>

unwritten, qualified or nonqualified, funded or unfunded (i) maintained,
contributed to or required to be contributed to by the Company (the foregoing
being herein called "Benefit Plans").  With respect to each Benefit Plan
maintained or contributed to by the Company or any of its subsidiaries or under
which any of them has any liability or obligation, the Company has made
available to Parent, if applicable, a true and correct copy of (a) the
most recent annual report (Form 5500) filed with the IRS, (b) such Benefit Plan,
(c) each trust agreement and group annuity contract, if any, relating to such
Benefit Plan, and (d) a current IRS determination letter.

               (b)  With respect to the Benefit Plans, individually and in the
aggregate, no event has occurred, and to the knowledge of the Company, there
exists no condition or set of circumstances in connection with which Parent or
any of its affiliates could be subject to any liability that is reasonably
likely to have a Material Adverse Effect (except liability for benefits claims
and funding obligations payable in the ordinary course) under ERISA, the
Internal Revenue Code of 1986, as amended (the "Code"), or any other applicable
law.  To the best of the knowledge of the Company, each Benefit Plan which is
intended to qualify under Section 401(a) of the Code ("Qualified Plans") is and
always has been qualified under such Section and each trust maintained in
connection with such a plan has at all time been exempt from federal income
taxes under Section 501 of the Code.  To the best of the knowledge of the
Company, each Qualified Plan is in receipt of a favorable determination letter
issued by the IRS, and each such letter has not been revoked nor, to the
knowledge of the Company, threatened to be revoked.  To the best of the
knowledge of the Company, each Benefit Plan has been administered in all
material respects in accordance with its terms and with all applicable laws.  No
"prohibited transaction" (within the meaning of Section 406 of ERISA or Section
4975 of the Code) has occurred with respect to any Benefit Plan which would
result directly or indirectly in liability to the Company.

               (c)  With respect to the Benefit Plans, individually and in the
aggregate, there are no funded benefit obligations for which contributions have
not been made or properly accrued and there are no unfunded benefit obligations
that have not been accounted for by reserves, or otherwise properly footnoted in
accordance with generally accepted accounting principles, on the financial
statements 

                                       22

<PAGE>

of the Company, which obligations are reasonably likely to have a Material
Adverse Effect.

               (d)  Neither the execution and delivery of this Agreement nor the
consummation of the transactions contemplated hereby will (i) result in any
material payment becoming due, or materially increase the amount of compensation
due, any current or former employee of the Company or any of its subsidiaries
including, without limitation, any severance payment or benefit; (ii) materially
increase any benefits otherwise payable under any Benefit Plan; or (iii) result
in the acceleration of the time of payment or vesting of any such material
benefits, except in each case as contemplated by this Agreement.

               (e)  The Company and its subsidiaries have complied in all
material respects with the continuation coverage requirements of Section 4980B
of the Code with respect to each group health plan within the meaning of Section
4980B(g)(2) of the Code.

               (f)  To the best of the knowledge of the Company, each Benefit
Plan which is not subject to regulation under ERISA ("Foreign Plan") has at all
times been maintained, operated and administered in all material respects in
compliance with its terms and all applicable laws.  To the best of the knowledge
of the Company, if a Foreign Plan is required under applicable law or by its
terms to be funded in any respect, such Foreign Plan is so funded and, if such
Foreign Plan is not required to be funded, the benefits payable under such
Foreign Plan are adequately reserved for on the Company's, or a subsidiary's,
financial statements included in the Company's SEC Reports (or there is an
adequate combination of reserves and funding) in accordance with U.S. generally
accepted accounting principles.  All contributions to and payments from any
Foreign Plan for all periods prior to the date of the balance sheet have been
fully paid or adequately reserved for on the Company's, or a subsidiary's,
financial statements included in the Company's SEC Reports in accordance with
U.S. generally accepted accounting principles.  There are no pending or, to the
knowledge of the Company, threatened actions, claims, lawsuits, arbitrations,
audits, investigations or similar proceedings involving any Foreign Plan, or the
assets, sponsor, administrator or fiduciaries of any such Foreign Plans (other
than routine benefit claims in type and amount consistent with past practice)
which would become the 

                                       23

<PAGE>

liability of the Company or Parent on and the after the Closing Date, nor does
the Company have knowledge of facts which could form a reasonable basis for any
such proceedings.

          SECTION 5.12   INTELLECTUAL PROPERTY.  The Company and its
subsidiaries fully own, or are licensed or otherwise have the right to use, all
patents, patent rights, invention rights, trademark rights, trade names, trade
name rights, service mark rights, copyrights, know-how, trade secrets,
technology and computer programs which are material to the conduct of the
business of the Company and its subsidiaries taken as a whole (the "Intellectual
Property"), including, but not limited to, the patents, patent rights, license
agreements, published foreign patent applications, trademark rights, trade
names, trade name rights and service mark rights set forth in Schedule 5.12 to
the Disclosure Statement.  Schedule 5.12 to the Disclosure Statement sets forth
a true, correct and complete list of the Intellectual Property (other than
invention rights, invention disclosures and related agreements and non-published
patent applications).  Except as set forth in Schedule 5.12 to the Disclosure
Statement, neither the Company nor any of its subsidiaries has been granted or
has granted any outstanding license (other than "shrink wrap licenses" for any
retail consumer products generally available) or other rights under any
Intellectual Property.  The Company and its subsidiaries fully own the data
compiled from all clinical trials and neither the Company nor any of its
subsidiaries is prohibited from (x) using such data in any manner, including for
purposes of gaining regulatory approval for any product of the Company currently
sold or under development or (y) assigning or otherwise transferring ownership
rights in such data to a third party.  Except as set forth in Schedule 5.12 to
the Disclosure Statement, (i) to the best of the knowledge of the Company, there
is no violation, breach, misappropriation or infringement by any third party of
any Company Intellectual Property, (ii) there are no pending or, to the best of
the knowledge of the Company, threatened opposition, interference,
reexamination, arbitration, invalidity, declaratory judgment, revocation,
nullity or similar actions in respect of any Company Intellectual Property and
(iii) to the best of the knowledge of the Company, the Company is not infringing
or otherwise adversely affecting the rights of any person with regard to any
patent, license, trademark, trade name, service mark, copyright, know-how, trade
secret or other intellectual property right held by that person nor has it
received notice of any such claim.

                                       24

<PAGE>

          SECTION 5.13   RESTRICTIONS ON OPERATIONS.  Except as set forth on
Schedule 5.13 to the Disclosure Statement, the Company and its subsidiaries are
not restricted directly or indirectly by any agreement to which the Company, or
any of its subsidiaries, is bound from carrying on its business anywhere in the
world nor is the Company aware of any other agreement which purports to restrict
the Company or any of its subsidiaries from carrying out its business anywhere
in the world.

          SECTION 5.14   ENVIRONMENTAL LAWS.  Except as disclosed on Schedule
5.14 to the Disclosure Statement, in the Environmental Reports (as defined in
Section 5.14(d)) or as would not have a Material Adverse Effect:

               (a)  The Company and its subsidiaries and their respective
operations comply in all material respects with all applicable Environmental
Laws (as defined in Section 5.14(e)).

               (b)  The Company and its subsidiaries have obtained and maintain
all Environmental Permits (as defined in Section 5.14(e)) necessary for their
operations; there are no legal proceedings pending or, to the knowledge of the
Company, threatened to revoke any such Environmental Permit, the Company and its
subsidiaries are in compliance in all material respects with all such
Environmental Permits; none of the Company or any of its subsidiaries has
received any written notice from any governmental authority to the effect that
there is lacking any Environmental Permit required in connection with the
current use or operation of any of its properties; and the consummation of the
transactions contemplated hereby will not cause the Company to have any of its
rights under such Environmental Permits adversely affected.

               (c)  To the best of the knowledge of the Company, all real
property owned, operated or leased by the Company and its subsidiaries is free
from contamination by Hazardous Materials (as defined in Section 3.14(e)) at
levels requiring remediation under any Environmental Laws and neither the
Company nor any of its subsidiaries has caused or permitted any Hazardous
Material to remain or be disposed of, either on or under real property legally
or beneficially owned, leased or operated by the Company or any of its
subsidiaries or on any real property not permitted to accept, store or dispose
of such Hazardous Materials other than in compliance with applicable
Environmental Laws.

                                       25

<PAGE>

               (d)  The Company and its subsidiaries have provided or made
available to Parent all audits, studies, reports, analyses and results of
investigations, memoranda and correspondence in the Company's possession related
to Environmental Laws or Environmental Claims that have been drafted, created or
performed with respect to currently or previously owned, leased or operated
properties of the operations of the Company and its subsidiaries.  The
foregoing, together with the report prepared by ERM Northeast, a member of the
Environmental Resource Management Group, in final form delivered to Parent
regarding the property owned, leased and operated by the Company or any of its
subsidiaries are collectively referred to as the "Environmental Reports".

               (e)  For purposes of this Agreement:

          "ENVIRONMENTAL CLAIM" means any written accusation, allegation, notice
of violation, action, claim, Environmental Lien, demand, abatement or other
order or direction (conditional or otherwise) by any governmental body or any
other person for personal injury (including sickness, disease or death),
tangible or intangible property damage, damage to the environment, nuisance,
pollution, contamination or other adverse effects on the environment, or for
fines, penalties or restrictions resulting from or based upon (i) the existence,
or the continuation of the existence, of a Release (including, without
limitation, sudden or non-sudden accidental or non-accidental Releases) of, or
exposure to, any Hazardous Material in, into or onto the environment (including,
without limitation, the air, soil, surface water or groundwater) at, in, by,
from or related to any property owned, operated or leased by the Company or its
subsidiaries or any activities or operations thereof; (ii) the generation,
transportation, storage, treatment, handling or disposal of Hazardous Materials
in connection with any property owned, operated or leased by the Company or its
subsidiaries or their operations or facilities; or (iii) the violation, or
alleged violation, of any Environmental Law, order or Environmental Permit of or
from any governmental body relating to environmental matters connected with any
property owned, leased or operated by the Company or its subsidiaries.

          "ENVIRONMENTAL LAW" means any federal, state, local or foreign law
(including common law), statute, code, ordinance, rule, regulation or other
requirement relating to the environment, natural resources, or public or
employee health and safety and includes, but is not limited to, the

                                       26

<PAGE>

Comprehensive Environmental Response, Compensation and Liability Act, 42 U.S.C.
Section 9601 ET SEQ., the Hazardous Materials Transportation Act, 49 U.S.C.
Section 1801 ET seq., the Resource Conservation and Recovery Act, 42 U.S.C.
Section 6901 ET SEQ., the Clean Water Act, 33 U.S.C. Section 1251 ET SEQ., the
Clean Air Act, 33 U.S.C. Section 2601 ET SEQ., the Toxic Substances Control Act,
15 U.S.C. Section 2601 ET SEQ., the Federal Insecticide, Fungicide, and
Rodenticide Act, 7 U.S.C. Section 136 ET SEQ., the Oil Pollution Act of 1990,
33 U.S.C. Section 2701 ET SEQ. and the Occupational Safety and Health Act, 29
U.S.C. Section 651 ET SEQ., (and including, without limitation, European Union
directives and regulations and, with respect to the European operations and
property located within the European Union, prescribed work practices and
technical or other standards issued by competent organizations) as such laws
have been amended or supplemented, and the regulations promulgated pursuant
thereto, and all analogous state or local statutes, including without
limitation, any state environmental property transfer statutes.

          "ENVIRONMENTAL PERMIT" means any permit, approval, authorization,
license, variance, registration, or permission required under any applicable
Environmental Law or order.

          "HAZARDOUS MATERIALS" means any hazardous substance, material or waste
which is regulated by any local, state,  Federal or foreign governmental body
in the jurisdiction in which the Company or any of its subsidiaries conducts
business, including, without limitation, any material or substance which is
defined as a "hazardous waste," "hazardous material," "hazardous substance,"
"extremely hazardous waste" or "restricted hazardous waste," "subject waste,"
"contaminant," "toxic waste" or "toxic substance" under any provision of
Environmental Law, including, but not limited to, petroleum products, asbestos
and polychlorinated biphenyls.

          "RELEASE" means any release, spill, emission, leaking, pumping,
pouring, dumping, emptying, injection, deposit, disposal, discharge, dispersal,
leaching, or migration on or into the indoor or outdoor environment or into or
out of any property.

          "REMEDIAL ACTION" means all actions, including, without limitation,
any capital expenditures, required or voluntarily undertaken to (i) clean up,
remove, treat, or in any other way address any Hazardous Material or other

                                       27

<PAGE>

substance; (ii) prevent the Release or threat of Release, or minimize the
further Release of any Hazardous Material so it does not migrate or endanger or
threaten to endanger public health or welfare or the indoor or outdoor
environment; (iii) perform pre-remedial studies and investigations or post-
remedial monitoring and care; or (iv) bring any property owned, operated or
leased by the Company or any of its subsidiaries and the facilities located and
operations conducted thereon into compliance with all Environmental Laws and
Environmental Permits.

          SECTION 5.15   COMPLIANCE WITH LAWS.  Except as set forth in Schedule
5.15 to the Disclosure Statement or as disclosed in the SEC Reports, neither the
Company nor any of its subsidiaries has violated or failed to comply with any
statute, law, ordinance, regulation, rule or order of any foreign, Federal,
state or local government or any other governmental department or agency, or any
judgment, decree or order of any court, applicable to its business or
operations, except where any such violations or failures to comply would not, in
the aggregate, have a Material Adverse Effect; and the conduct of the business
of the Company and its subsidiaries is in conformity with all Federal, state and
local energy and public utility and all other Federal, state and local
governmental and regulatory requirements applicable to its business or
operations, except where such nonconformities would not, in the aggregate, have
a Material Adverse Effect.  The Company and its subsidiaries have all permits,
licenses and franchises from governmental agencies required to conduct their
businesses as now being conducted, except for such permits, licenses and
franchises the absence of which would not, in the aggregate, have a Material
Adverse Effect.

          SECTION 5.16   TAXES.  Except as set forth in Schedule 5.16 to the
Disclosure Statement:

               (a)  Each of the Company and its subsidiaries has (i) timely
filed all Federal and all state, local and foreign returns, declarations,
reports, estimates, information returns and statements ("Returns") required to
be filed by or for it on or prior to the date hereof in respect of any Taxes and
such Returns are true, complete and correct in all material respects,
(ii) timely paid all Taxes that are shown as being due on any Returns,
(iii) established reserves that are adequate for the payment of all Taxes not
yet due and payable with respect to the results of operations of the Company and
its subsidiaries through the date hereof, (iv) complied in all material 

                                       28

<PAGE>

respects with all applicable laws, rules and regulations relating to Taxes, and
(v) timely withheld and paid over to the proper governmental authorities all
Taxes and other amounts required to be so withheld and paid over.

               (b)  (i) Schedule 5.16 to the Disclosure Statement sets forth the
last taxable period (x) through which the Federal Returns of the Company and any
of its subsidiaries have been examined by the Internal Revenue Service ("IRS")
or (y) for which the date for assessment and collection of any deficiency has
expired; (ii) all deficiencies asserted as a result of such examinations have
been paid, fully settled or adequately provided for in the Company's most recent
audited financial statements; (iii) no Federal tax audits or
other administrative proceedings or court proceedings are presently pending with
respect to the Company or any of its subsidiaries with regard to any Federal
Taxes; and (iv) the Company has not received notice that any deficiency for any
such Taxes aggregating in excess of $50,000 has been proposed, asserted or
assessed against the Company or any of its subsidiaries, by any Federal, state,
local or foreign taxing authority or court with respect to any period.

               (c)  Neither the Company nor any of its subsidiaries has executed
or entered into with the IRS or any other taxing authority (i) any agreement or
other document that continues in force and effect beyond the Effective Time and
that extends or has the effect of extending the period for assessments or
collection of any Federal, state, local or foreign Taxes or (ii) a closing
agreement pursuant to Section 7121 of the Code, or any predecessor provision
thereof, or any similar agreement, pursuant to any similar provision of state,
local or foreign law, that continues in force and effect beyond the Effective
Time.

               (d)  Neither the Company nor any of its subsidiaries is a party
to an agreement that provides for the payment of any amount that would
constitute a "parachute payment" within the meaning of Section 280G of the Code.

               (e)  Neither the Company nor any of its subsidiaries has made an
election under Section 341(f) of the Code or agreed to have Section 341(f)(2) of
the Code apply to any disposition of a subsection (f) asset (as such term is
defined in Section 341(f)(4) of the Code) owned by the Company or any of its
subsidiaries.

                                       29

<PAGE>

               (f)  Neither the Company nor any of its subsidiaries is a party
to, is bound by or has any obligation under any tax sharing agreement or similar
agreement or arrangement.

               (g)  All representations made by the Company, any of its
subsidiaries or their respective authorized representatives in connection with
any tax exemption, grant, dispensation or similar allowance under any Federal,
state, local or foreign tax laws are complete, true and accurate in all material
respects and any covenants, promises or undertakings made or to be performed by
the Company or any of its subsidiaries in connection with such tax exemption,
grant, disposition or similar allowance under any such Federal, state, local or
foreign tax laws have been duly discharged or performed in accordance with their
terms.

               (h)  The Company (i) has not agreed to make, nor is it required
to make any adjustment under Section 481(a) of the Code by reason of a change in
accounting method or otherwise and (ii) has not leased or rented any property
other than on arm's length terms and conditions.

               (i)  Neither the Company nor any of its subsidiaries is, or has
been, a United States Real Property Holding Corporation within the meaning of
Code Section 897(c)(2) during the applicable period specified in Code Section
897(c)(1)(A)(ii).

          For purposes of this Agreement, (i) "Taxes" shall mean all Federal,
state, local, foreign and other taxes, charges, fees, levies, imposts, duties,
licenses or other assessments of every kind and description, together with any
interest and any penalties, additions to tax or additional amounts imposed by
any taxing authority and (ii) "Code" shall mean the Internal Revenue Code of
1986, as amended, and the rules and regulations thereunder, and any reference to
a specific provision of the Code shall include any predecessor of such Code
provision which was in effect on or after January 1, 1988.

          SECTION 5.17   PRODUCT REGISTRATION; REGULATORY COMPLIANCE.  (a)
Schedule 5.17 to the Disclosure Statement sets forth, as of the date hereof, a
list of all licenses and approvals granted by or pending with any governmental
authority in any particular country to market any product relating to the
Company's business as conducted on the date hereof (the "Product
Registrations").  Except as set forth in Schedule 5.17 to the Disclosure
Statement, (i) all 

                                       30

<PAGE>

products sold under the Product Registrations are manufactured and marketed in
accordance with the specifications and standards contained in such Product
Registrations, (ii) the Company is the sole and exclusive owner of the Product
Registrations and has not granted any right or reference with respect thereto
and is not prohibited from assigning or otherwise transferring its rights to
such Product Registrations to a third party, (iii) the Product Registrations
granted are in full force and effect with all required annual reports filed and
government maintenance fees and taxes having been paid thereon and no consent of
any governmental authority is required in connection with the transactions
contemplated hereby, (iv) each of the products produced or sold in connection
with the Company's business as conducted on the date hereof (x) is, and at all
times has been, in compliance with all applicable laws, and (y) is, and at all
relevant times has been, fit for the ordinary purposes of which it is intended
to be used and conforms to any promises or affirmations of fact made on the
label for such product or in connection with its sale, or is or has been
provided for use in research, scientific or experimental programs or used for
research, scientific or experimental purposes in accordance with an express
understanding that its fitness and its conformance to performance expectations
are undergoing evaluation, and (v) to the knowledge of the Company, there is no
design or production defect with respect to any of such products and no facts
have come to the Company's attention as a result of the Company's research which
indicates that there are any design defects with respect to any of such
products, and each of such products contains adequate warnings, presented in a
reasonably prominent manner, in accordance with applicable laws and current
industry practice with respect to its packaging, contents and use.

          (b)  The Company is not aware of any facts:  (i) which would furnish a
substantial basis for the recall, withdrawal or suspension by any governmental
authority, or by order of any court, of any product sold by the Company; or
(ii) which would otherwise reasonably be expected to cause the Company to
withdraw, recall or suspend any product from the market, or otherwise take any
other remedial action, or to terminate or suspend the manufacturing or testing
of any product.

          (c)  Except as set forth in the SEC Reports, Schedule 5.10 or Schedule
5.17, there is no suit, claim, action or proceeding (at law or in equity)
pending nor, to the knowledge of the Company, is any suit, claim, action or

                                       31

<PAGE>

proceeding threatened against the Company or any of its subsidiaries before any
court or governmental or regulatory authority or body involving any claim that
any product of the Company is defective or otherwise has caused physical harm to
any user.

          SECTION 5.18   COMPANY ACTION.  The Board of Directors of the Company
(at a meeting duly called and held) has by the requisite vote of all directors
present (a) determined that the Offer and Merger is advisable and in the best
interests of the Company and it shareholders, (b) approved this Agreement and
the transactions contemplated hereby, including the Offer and the Merger, and
(c) directed that this Agreement and the Merger be submitted for consideration
by the Company's shareholders at a duly called meeting (the "Company Meeting")
and has determined to recommend, subject to the Board's ability to withdraw,
modify or change its recommendation regarding this Agreement and the Merger in
accordance with the provisions of Section 7.2, the approval by the Company's
shareholders of these matters.  In connection with its consideration of this
Agreement, the Board of Directors of the Company received a written opinion from
Dillon Read that the Offer Consideration to be received by the Company's common
shareholders in the Offer and the Merger is fair, from a financial point of
view, to such shareholders.  The affirmative votes of the holders of a majority
of the outstanding Shares entitled to vote thereon are the only votes of the
holders of any class or series of Company capital stock necessary to approve
this Agreement and the transactions contemplated hereby, including the Merger.  

          SECTION 5.19   LABOR MATTERS.  Except as disclosed on Schedule 5.19 of
the Disclosure Statement, neither the Company nor any of its subsidiaries is a
party to or bound by any collective bargaining agreement, contract or other
agreement or understanding with a labor union or labor organization.

          SECTION 5.20   SUPPLY.  On April 9, 1996, the Company and its
subsidiaries had in finished goods inventory 188 units of endoluminal grafts
manufactured at their facilities in Belgium, which together with ongoing
manufacturing operations in Belgium, is sufficient for continuing to supply at
current levels the reasonably anticipated requirements of all clinical trials
currently in progress and currently scheduled.

                                       32

<PAGE>

                                   ARTICLE VI

                         REPRESENTATIONS AND WARRANTIES
                            OF PARENT AND MERGER SUB

          Parent and Merger Sub represent and warrant to the Company as follows:

          SECTION 6.1    ORGANIZATION AND QUALIFICATION.  Each of the Parent and
Merger Sub is a corporation duly organized, validly existing and in good
standing under the laws of the jurisdiction of its incorporation and has all
requisite corporate power and authority to carry on its business as it is now
being conducted.

          SECTION 6.2    CORPORATE POWER AND AUTHORITY.  Each of the Parent and
Merger Sub has full corporate power and authority to execute and deliver this
Agreement and to consummate the transactions contemplated hereby.  The execution
and delivery by Parent and Merger Sub of this Agreement and the consummation by
Parent and Merger Sub of the transactions contemplated hereby have been duly
authorized by the respective Boards of Directors of Parent and Merger Sub, and
the sole shareholder of Merger Sub, and no other corporate proceedings on the
part of the Parent or Merger Sub are necessary to authorize this Agreement or
to consummate the Merger and the other transactions contemplated by this
Agreement. This Agreement has been duly and validly executed and delivered by
each of Parent and Merger Sub and, assuming this Agreement constitutes a valid
and binding obligation of the Company, this Agreement constitutes the legal,
valid and binding obligation of each of Parent and Merger Sub, enforceable
against each of Parent and Merger Sub in accordance with its terms, subject to
bankruptcy, insolvency, fraudulent conveyance, reorganization, moratorium and
similar laws, now or hereafter in effect, affecting creditors' rights and
remedies and to general principles of equity.

          SECTION 6.3    GOVERNMENTAL AUTHORIZATION.  The execution, delivery
and performance by each of the Parent and Merger Sub of this Agreement and the
consummation of the transactions contemplated hereby by Merger Sub require no
action by or in respect of, or filing with, any governmental body, agency,
official or authority other than (i) the filing with the SEC of such reports and
information as may be required in connection with this Agreement and the
transactions contemplated hereby pursuant to the applicable requirements of the
Securities Act and the Exchange Act and

                                       33

<PAGE>

the rules and regulations promulgated thereunder, (ii) the filing of the
Articles of Merger in accordance with the BCA, (iii) such filings,
authorizations, orders and approvals as may be required under foreign laws,
(iv) compliance with applicable requirements of the HSR Act, except for filings
and approvals which are not required prior to the consummation of the Merger or
where the failure of any such action to be taken or filing to be made would not
have or reasonably be expected to have, individually or in the aggregate, a
material adverse effect on Parent or prevent consummation of the transactions
contemplated hereby.

          SECTION 6.4    NON-CONTRAVENTION.  The execution, delivery and
performance by Parent and Merger Sub of this Agreement and the consummation of
the transactions contemplated hereby by Parent and Merger Sub do not and will
not (i) contravene or conflict with the Certificate of Incorporation or Bylaws
of the Parent or the Articles of Incorporation or Bylaws of Merger Sub,
(ii) assuming compliance with the matters referred to in Section 6.3, contravene
or conflict with or constitute a violation of any provision of any law,
regulation, judgment, injunction, order or decree binding upon or applicable to
Parent or Merger Sub, (iii) constitute or result in a default under or give rise
to a right of termination, cancellation or acceleration of any right or
obligation of Parent or Merger Sub or to a loss of any benefit to which Parent
or Merger Sub is entitled under any provision of any agreement or other
instrument binding upon Parent or Merger Sub or any license, franchise, permit
or other similar authorization held by Parent or Merger Sub, or (iv) result in
the creation or imposition of any Lien on any asset of Parent or Merger Sub,
except for any occurrences or results referred to in clauses (ii), (iii), and
(iv) which would not have or reasonably be expected to have, individually or in
the aggregate, a material adverse effect on Parent or prevent consummation of
the transactions contemplated hereby.

          SECTION 6.5    MERGER SUB.  (a)  Parent owns all of the outstanding
stock of Merger Sub; at all times prior to the Merger, no person other than
Parent has owned, or will own, any of the outstanding stock of Merger Sub.
Merger Sub was formed by Parent solely for the purpose of engaging in the
transactions contemplated by this Agreement.

               (b)  There are not as of the date of this Agreement, and there
will not be at the Effective Time, any outstanding or authorized options,
warrants, calls, rights, commitments or any other agreements of any character
which 

                                       34

<PAGE>

Merger Sub is a party to, or may be bound by, requiring it to issue, transfer,
sell, purchase, redeem or acquire any shares of its capital stock or any
securities or rights convertible into, exchangeable for, or evidencing the right
to subscribe for or acquire, any shares of its capital stock.

               (c)  As of the date of this Agreement and the Effective Time,
except for obligations incurred in connection with this Agreement, Merger Sub
has not and will not have incurred, directly or indirectly through any other
corporation, any obligations or liabilities of any kind or engaged in any
activities of any type or kind whatsoever or entered into any arrangement or
arrangements with any person or entity.

               (d)  Parent will make available, and Merger Sub will have, at or
before the Acceptance Date, adequate funds to accept for payment, purchase and
pay for all of the Shares tendered and not withdrawn pursuant to the Offer.


                                   ARTICLE VII

                                    COVENANTS

          SECTION 7.1    CONDUCT OF BUSINESS.  Except as expressly provided in
this Agreement, or as expressly agreed to in writing by Parent, or as set forth
in Schedule 7.01 to the Disclosure Statement, during the period from the date of
this Agreement and continuing until the Control Date or until the termination of
this Agreement pursuant to Section 9.1 (the "Executory Period"):

               (a)  The Company will use commercially reasonable efforts, and
will cause each of its subsidiaries to use commercially reasonable efforts, to
conduct its operations according to its ordinary and usual course of business
and consistently with past practice and to preserve intact its respective
business organization, keep available the services of its officers and employees
and maintain satisfactory relationships with licensors, suppliers, distributors,
customers and others having business relationships with it.

               (b)  The Company will, and will cause each of its subsidiaries
to, maintain its books and records in its usual manner and consistent with past
practice and not permit a material change in any of its financial reporting,

                                       35

<PAGE>

tax, or accounting practices or policies or in any assumption underlying such
practices or policies, or in any method of calculating any bad debt,
contingency, or other reserve for financial reporting purposes or for other
accounting purposes, except as may be required by generally accepted accounting
principles.

               (c)  Without limiting the generality of the foregoing, neither
the Company nor any of its subsidiaries, as the case may be, will, without the
prior written consent of Parent, (i) issue, sell, pledge or encumber, or
authorize or propose the issuance, sale, pledge or encumbrance of (A) any shares
of capital stock of any class (including Shares), or securities convertible
into, or exchangeable for, any such shares, or any rights, warrants or options
to acquire any such shares or other convertible or exchangeable securities, or
grant or accelerate any right to convert or exchange any securities of the
Company or any of its subsidiaries for such shares, other than shares issuable
upon exercise of currently outstanding stock options, stock awards or warrants,
or (B) any other securities in respect of, in lieu of or in substitution for
shares of common stock outstanding on the date hereof (including the Shares);
(ii) redeem, purchase or otherwise acquire, or propose to redeem, purchase or
otherwise acquire, any of its outstanding securities (including the Shares);
(iii) split, combine or reclassify any shares of its capital stock or declare or
pay any dividend or distribution on any shares of capital stock of the Company;
(iv) except as set forth in Schedule 7.01 to the Disclosure Statement, make any
acquisition of a material amount of assets or securities, any disposition of a
material amount of assets or securities, or enter into or modify any material
contract, agreement, commitment, arrangement, license or right or any release or
relinquishment of any material contract rights, not in the ordinary course of
business; (v) pledge or encumber any material assets of the Company except in
the ordinary course of business consistent with past practice; (vi) incur any
long-term debt for borrowed money or short-term debt for borrowed money, except
for unsecured debt bearing interest at current market rates incurred in the
ordinary course of business consistent with past practice; (vii) propose or
adopt any amendments to the Articles of Incorporation or Bylaws of the Company
or any of its subsidiaries; (viii) enter into any new employment agreement
providing for compensation (including salary, bonus, benefits and all other
forms of compensation, whether immediately payable or deferred) in excess of
$50,000 per year or amend any existing agreement with any officer, 

                                       36

<PAGE>

director or employee or grant any increase in the compensation or benefits to
officers, directors, employees and former employees other than increases in the
ordinary course of business and consistent with past practice or pursuant to the
terms of agreements or plans as currently in effect; (ix) adopt a plan of
complete or partial liquidation or resolutions providing for the complete or
partial liquidation or dissolution of the Company or any of its subsidiaries;
(x) assume, guarantee, endorse or otherwise become liable or responsible
(whether directly, contingently or otherwise) for the obligations of any other
person except wholly-owned subsidiaries of the Company in the ordinary course of
business and consistent with past practices; (xi) make any loans, advances or
capital contributions to, or investments in, any other person (other than loans
or advances to subsidiaries and customary loans or advances to employees in
accordance with past practices); (xii) adopt or amend (except as may be required
by law or required by this Agreement) any bonus, profit sharing, compensation,
stock option, pension, retirement, deferred compensation, employment or other
employee benefit plan, agreement, trust, fund or other arrangement for the
benefit or welfare of any employee or former employee; (xiii) take any action
other than in the ordinary course of business and consistent with past practice
with respect to the grant of any severance or termination pay or with respect to
any increase of benefits payable under its severance or termination pay policies
in effect on the date hereof; (xiv) make any tax election or settle or
compromise any material Federal, state, local or foreign income tax liability,
except in the ordinary course of business and consistent with past practice;
(xv) execute or enter into with the IRS or any other taxing authority (x) any
agreement or other document extending or having the effect of extending the
period of assessments or collection of any Federal, state, local or foreign
Taxes or (y) a closing agreement pursuant to Section 7121 of the Code, or any
successor provision thereof, or any similar agreement, pursuant to any similar
provision of state, local or foreign laws; (xvi) except pursuant to agreements
in effect on the date hereof which are disclosed on Schedule 7.01 to the
Disclosure Statement or as contemplated by the capital expenditures budget
currently in effect, authorize capital expenditures in excess of $50,000 in the
aggregate; or (xvii) authorize or propose any of the foregoing, or enter into
any contract, agreement, commitment or arrangement to do any of the foregoing,
or take any action which would make any representation or warranty of the
Company in this Agreement untrue or incorrect.

                                       37

<PAGE>

               (d)  The Company will, prior to the Acceptance Date, use its
reasonable best efforts to obtain written determinations or permits from the
responsible governmental authorities as to which environmental permits are
required for presently unpermitted activities including, but not limited to,
waste water discharges and air emissions at the Company's facilities in Florida
and operations in Brussels, Belgium.  Upon the receipt of a determination that a
permit is required, the Company shall, as soon as possible, file applications
and support information necessary to obtain such permits and shall use its
reasonable best efforts to expedite the issuance of such permits.  With regard
to the Corvita Europe operating permit only, the Company shall file the
application for such permit prior to the Acceptance Date.

               (e)  Each of the Company and its subsidiaries shall file all
Returns that are due prior to the Closing Date and shall prior to the Closing
Date pay any and all taxes shown as being due on such Returns.  The Company
shall provide to Parent at the Closing a copy of such Returns and a copy of the
receipts for any and all Taxes paid with respect to such Returns.

          SECTION 7.2    NO SOLICITATION.  (a)  Until the earlier of the Control
Date or the termination of this Agreement, the Company shall not, and shall not
permit any of its subsidiaries, or any of its or their officers, directors,
employees, representatives, agents or affiliates (including, without limitation,
any investment banker, attorney or accountant retained by the Company or any of
its subsidiaries), to, directly or indirectly, initiate, solicit or knowingly
encourage (including by way of furnishing non-public information or assistance),
or take any other action knowingly to facilitate, any inquiries or the making of
any proposal that constitutes, or may reasonably be expected to lead to, an
Acquisition Proposal (as defined below), or enter into or maintain or continue
discussions or negotiate with any person or entity in furtherance of such
inquiries or to obtain an Acquisition Proposal or agree to or endorse any
Acquisition Proposal, or authorize or permit any of its or their officers,
directors or employees or any of its subsidiaries or any investment banker,
financial advisor, attorney, accountant or other representative retained by
it or any of its subsidiaries to take any such action; PROVIDED, HOWEVER, that
nothing in this Agreement shall prohibit the Board of Directors of the Company
from furnishing information to, or entering into, maintaining or continuing
discussions or negotiations with, any person or 

                                       38

<PAGE>

entity that makes an unsolicited Acquisition Proposal after the date hereof, if
the Board of Directors of the Company, after consultation with and based upon
the advice of independent legal counsel (who may be the Company's regularly
engaged independent legal counsel), determines in good faith that the failure to
take such action could create a reasonable possibility of a breach by the Board
of Directors of the Company of its fiduciary duties to shareholders under
applicable law and, prior to taking such action, the Company (i) provides
reasonable notice to Parent to the effect that it is taking such action and (ii)
receives from such person or entity an executed confidentiality agreement in
reasonably customary form.  The Company shall use reasonable efforts to keep
Parent informed of the status of any such Acquisition Proposal.  For purposes of
this Agreement, "Acquisition Proposal" means an inquiry, offer or proposal
regarding any of the following (other than the transactions contemplated by this
Agreement with Parent or Merger Sub) involving the Company or any of its
subsidiaries:  (w) any merger, consolidation, share exchange, recapitalization,
business combination or other similar transaction; (x) any sale, lease,
exchange, mortgage, pledge, transfer or other disposition of all or
substantially all the assets of the Company and its subsidiaries, taken as a
whole, in a single transaction or series of related transactions; (y) any tender
offer or exchange offer for 20 percent or more of the outstanding shares of
capital stock of the Company or the filing of a registration statement under the
Securities Act in connection therewith; or (z) any public announcement of a
proposal, plan or intention to do any of the foregoing or any agreement to
engage in any of the foregoing.

          (b)  Except as set forth in this Section 7.2(b), the Board of
Directors of the Company shall not (i) withdraw or modify, or propose to
withdraw or modify, in a manner adverse to Parent or Merger Sub, the approval or
recommendation by the Board of Directors of the Offer, this Agreement or the
Merger, (ii) approve or recommend, or propose to approve or recommend, any
Acquisition Proposal or (iii) cause the Company to enter into any agreement with
respect to any Acquisition Proposal.  Notwithstanding the foregoing, in the
event that prior to the time of acceptance for payment of Shares in the Offer
the Board of Directors of the Company determines in good faith, after
consultation with and based upon the advice of independent legal counsel (who
may be the Company's regularly engaged independent legal counsel), that the
failure to take such action could create a reasonable possibility of a breach by
the Board of 

                                       39

<PAGE>

Directors of the Company of its fiduciary duties to the Company's shareholders
under applicable law, the Board of Directors of the Company may withdraw or
modify its approval or recommendation of the Offer, this Agreement and the
Merger, approve or recommend an Acquisition Proposal that is more favorable to
shareholders of the Company than the Offer and Merger (a "Superior Proposal") or
cause the Company to enter into an agreement with respect to a Superior
Proposal.  The Company shall provide reasonable notice to Parent or Merger Sub
to the effect that it is taking such action in no event less than 3 business
days.

          SECTION 7.3    ACCESS TO INFORMATION.  During the Executory Period,
the Company will upon reasonable notice (i) give Parent and its authorized
representatives reasonable access during regular business hours to all of its
subsidiaries, plants, offices, warehouses and other properties and to their
employees, agents, independent accountants and all of their books, records and
contracts, (ii) permit Parent and its authorized representatives to make such
inspections, including, without limitation, environmental assessments or
surveys, during regular business hours as Parent may reasonably require and
(iii) cause its officers and those of its subsidiaries to furnish Parent and its
authorized representatives with such financial and operating data and other
information with respect to the business and properties of the Company and its
subsidiaries as the Parent may from time to time reasonably request, provided
that all requests for such access, inspection, or information and notices
pursuant to this Section 7.3 be made through Norman R. Weldon, Ph.D. or such
other person as he shall designate in notice to Parent in accordance with
Section 10.5 hereof.  Notwithstanding anything to the contrary contained herein,
the Company shall deliver to Parent, immediately after the execution of this
Agreement by all of the parties hereto, a schedule which sets forth a true,
correct and complete list of invention rights, invention disclosures and related
agreements and non-published patent applications of the Company and its
subsidiaries not previously disclosed to Parent in Schedule 5.12 to the
Disclosure Statement and shall provide Parent with access to all such documents
and information relating thereto in accordance with this Section 7.3.

          SECTION 7.4    REASONABLE BEST EFFORTS.  Subject to the terms and
conditions herein, and to the fiduciary duties of the Board of Directors of the
Company under applicable laws, each of the parties hereto agrees to (i) make all
required filings under the HSR Act as promptly 

                                       40

<PAGE>

as practicable but in no event later than six business days of the date hereof,
and thereafter promptly make any other required submissions under the HSR Act,
(ii) promptly make their respective filings and thereafter promptly make any
other required submissions under the Securities Act and the Exchange Act with
respect to the Merger and (iii) use its reasonable best efforts to take, or
cause to be taken, all appropriate action, and to do, or cause to be done, all
things necessary, proper or advisable under applicable laws and regulations to
consummate and make effective the transactions contemplated by this Agreement,
including, without limitation, (a) using their respective reasonable best
efforts to obtain all licenses, permits, consents, approvals, authorizations,
qualifications and orders of governmental authorities and parties to contracts
with the Company and its subsidiaries as are necessary for consummation of the
transactions contemplated by this Agreement and to fulfill the conditions to the
Merger, (b) taking any action reasonably necessary to vigorously defend, lift,
mitigate and rescind the effect of any litigation or administrative proceeding
adversely affecting this Agreement or the transactions contemplated hereby,
including, without limitation, promptly appealing any adverse court or
administrative order or injunction and (c) to fulfill all conditions precedent
applicable to such party pursuant to this Agreement.  In case at any time after
the Effective Time any further action is necessary or desirable to carry out the
purposes of this Agreement, the proper officers and directors of each party to
this Agreement shall use their reasonable best efforts to take all such
necessary action.

          SECTION 7.5    INDEMNIFICATION AND INSURANCE.  (a) The Surviving
Corporation and Parent agree that until six years from the Effective Time, the
Surviving Corporation will maintain all rights to indemnification now existing
in favor of the directors, officers, employees, fiduciaries and agents of the
Company as provided in the Company's Articles of Incorporation and Bylaws or
otherwise in effect under any agreement or otherwise on the date of this
Agreement and that the Articles of Incorporation and Bylaws of the Surviving
Corporation shall not be amended to reduce or limit the rights of indemnity
afforded to the present and former directors and officers of the Company, or the
ability of the Surviving Corporation to indemnify them, nor to hinder, delay or
make more difficult the exercise of such rights of indemnity or the ability to
indemnify.

                                       41

<PAGE>

               (b)  The Surviving Corporation will at all times exercise the
powers granted to it by its Articles of Incorporation, its Bylaws, and by
applicable law to indemnify and hold harmless to the fullest extent possible
present or former directors, officers, employees, fiduciaries and agents of the
Company against any threatened or actual claim, action, suit, proceeding or
investigation made against them arising from their service in such capacities
(or service in such capacities for another enterprise at the request of the
Company) prior to, and including the Effective Time for at least six years from
the Effective Time.  Parent shall assume and perform the obligations of the
Surviving Corporation under this Section 7.5; PROVIDED, that, any indemnified
party shall make a good faith effort (which shall not include any requirement to
bring any suit, claim, action, or other proceeding) to cause the Surviving
Corporation to perform its obligations under this Section 7.5 before requesting
Parent to assume and perform such obligations.

               (c)  Should any threatened or actual claim action, suit,
proceeding or investigation be made against any present or former director,
officer, employee, fiduciary or agent of the Company, arising from his services
as such, within six years from the Effective Time, the provisions of this
Section 7.5 shall continue in effect until the final disposition of all such
claims.

               (d)  Any indemnified party wishing to claim indemnification under
this Section, upon learning of any such action, suit, claim, proceeding or
investigation, shall notify Parent and the Surviving Corporation within 15 days
thereof; PROVIDED, HOWEVER, that any failure so to notify Parent and the
Surviving Corporation of any obligation to indemnify such indemnified party or
of any other obligation imposed by this Section shall not affect such
obligations except to the extent Parent and/or the Surviving Corporation is
actually prejudiced thereby.  Parent and the Surviving Corporation shall be
entitled to assume the defense of any such action, suit, claim, proceeding or
investigation with counsel of its choice, unless there is, under applicable
standards of professional conduct, a conflict of any significant issue between
the positions of Parent and the Surviving Corporation, on the one hand, and the
indemnified parties, on the other, in which event the indemnified parties as a
group may retain one law firm to represent them with respect to such matter.
Neither Parent or the Surviving Corporation, on the one hand, nor the
indemnified parties, on the other hand, may settle any such action, 

                                       42

<PAGE>

suit, claim, proceeding or investigation without the prior written consent of
the other party, which consent shall not be unreasonably withheld or delayed.

               (e)  In addition to the foregoing, Parent shall cause the
Surviving Corporation to honor in accordance with their terms any
indemnification agreements in existence on the date hereof between the Company
and any present or former director, officer, employee, fiduciary or agent of the
Company.

               (f)  The parties agree that the provisions of this Section 7.5
will not require Parent or the Surviving Corporation to maintain directors' and
officers' insurance coverage in favor of the Company's present and former
directors and officers.

          SECTION 7.6    STATE TAKEOVER STATUTES.  The Company shall, upon the
request of Parent, take all reasonable steps to assist in any challenge by
Parent to the validity or applicability to the Offer or the Merger of any state
takeover law.

          SECTION 7.7    PROXY STATEMENT.  Unless the Merger is consummated in
accordance with Section 1104 of the BCA, the Company shall prepare and file with
the SEC, and in consultation with Parent and Merger Sub, as soon as practicable
after the consummation of the Offer, a preliminary proxy or information
statement (the "Preliminary Proxy Statement") relating to the Merger in
accordance with the Exchange Act and the rules and regulations under the
Exchange Act, with respect to the transactions contemplated by this Agreement.
The Company, Parent and Merger Sub shall cooperate with each other in the
preparation of the Preliminary Proxy Statement.  The Company shall use all
reasonable efforts to respond promptly to any comments made by the SEC with
respect to the Preliminary Proxy Statement, and to cause the Proxy Statement to
be mailed to the Company's shareholders at the earliest practicable date.

          SECTION 7.8    COMPANY MEETING.  The Company shall take all action
necessary, in accordance with BCA and its Articles of Incorporation and Bylaws,
to convene a special meeting of shareholders of the Company (the "Company
Meeting"), if necessary, as promptly as practicable for the purpose of
considering and voting upon this Agreement and the transactions contemplated
hereby, including the Merger.  Subject to the fiduciary duties of the Company's
Board of Directors under applicable law as advised in writing by 

                                       43

<PAGE>

outside legal counsel (who may be the Company's regularly engaged independent
legal counsel), the Board of Directors of the Company shall recommend that the
holders of the Shares vote in favor of and approve this Agreement and the Merger
at the Company Meeting.

          SECTION 7.9    SUPPORT OF MERGER.  Merger Sub shall, and Parent shall
cause Merger Sub to, vote all of the Shares that it acquires in the Offer in
favor of the Merger at any meeting of shareholders of the Company required to be
held to approve the Merger and cause the Company and Merger Sub to execute and
file Articles of Merger with the Secretary of State of the State of Florida.


                                  ARTICLE VIII

                    CONDITIONS TO CONSUMMATION OF THE MERGER

          SECTION 8.1    CONDITIONS TO EACH PARTY'S OBLIGATION TO EFFECT THE
MERGER.  The respective obligations of each party to effect the Merger are
subject to the satisfaction or waiver, where permissible, prior to the Effective
Time, of the following conditions:

               (a)  Merger Sub shall have accepted for payment and paid for
Shares pursuant to the Offer in accordance with the terms thereof; PROVIDED,
HOWEVER, that this condition shall be deemed satisfied with respect to the
obligations of Parent and Merger Sub if Merger Sub shall have failed to purchase
Shares pursuant to the Offer in violation of this Agreement or the terms of the
Offer.

               (b)  Unless the Merger is consummated pursuant to Section 1104 of
the BCA, this Agreement and the Merger shall have been approved and adopted by
the affirmative vote of the shareholders of the Company by the requisite vote in
accordance with applicable law.

               (c)  No statute, rule, regulation, executive order, decree or
injunction shall have been enacted, entered, promulgated or enforced by any
Federal or state court or governmental authority and no other action shall have
been taken by any regulatory authority or agency which is in effect and has the
effect of prohibiting the consummation of the Merger.

                                       44

<PAGE>

                                   ARTICLE IX

                         TERMINATION; AMENDMENT; WAIVER

          SECTION 9.1    TERMINATION.  This Agreement may be terminated and the
Merger contemplated hereby may be abandoned at any time notwithstanding approval
thereof by the shareholders of the Company, but prior to the Effective Time, in
any one of the following circumstances:

               (a)  By mutual written consent duly authorized by the Boards of
Directors of the Company and Parent prior to the Control Date.

               (b)  By Parent or the Company, if, without any material breach by
such terminating party of its obligations under this Agreement, the purchase of
Shares pursuant to the Offer shall not have occurred on or before August 9,
1996.

               (c)  By Parent or the Company, if the Offer expires or is
terminated or withdrawn pursuant to its terms without any Shares being purchased
in accordance with Section 1.1; PROVIDED, HOWEVER, that Parent may not terminate
this Agreement pursuant to this Section 9.1(c), if Parent's termination of, or
Merger Sub's failure to accept for payment or pay for any Shares tendered
pursuant to, the Offer does not follow the occurrence, or failure to occur, as
the case may be, of any condition set forth in Exhibit A or is otherwise in
violation of the terms of the Offer or this Agreement.

               (d)  By Parent or the Company, if any Federal or state court of
competent jurisdiction or other Federal or state governmental body shall have
issued an order, decree or ruling, or taken any other action permanently
restraining, enjoining or otherwise prohibiting the Merger and such order,
decree, ruling or other action shall have become final and non-appealable.

               (e)  By the Company, if it shall have received a Superior
Proposal, and the Company's Board of Directors, after consultation with and
based upon the written advice of outside legal counsel (who may be the Company's
regularly engaged outside legal counsel), determines in good faith that failure
to accept such Superior Proposal could create a reasonable possibility of a
breach by the Board of Directors of the Company of its fiduciary duties to
shareholders under applicable law.

                                       45

<PAGE>

               (f)  By Parent, but only prior to the Acceptance Date, if the
Board of Directors of the Company shall have (i) withdrawn, modified or amended
in any adverse respect its approval or recommendation of this Agreement, the
Merger or the transactions contemplated hereby, (ii) recommended to its
shareholders an Acquisition Proposal or (iii) resolved to do any of the
foregoing.

               (g)  By Parent or the Company, but only prior to the Acceptance
Date, if (A) the other party shall have failed to comply in any material respect
with any of the material covenants and agreements contained in this Agreement to
be complied with or performed by such party at or prior to such date of
termination, and such failure continues for ten business days after the actual
receipt by such party of a written notice from the other party setting forth in
detail the nature of such failure, or (B) a material representation or warranty
of the other party contained in this Agreement shall be untrue in any material
respect when made or on and as of the Acceptance Date as if made on the
Acceptance Date.

               (h)  By the Company, if the Offer has not been timely commenced
in accordance with Section 1.1.

          SECTION 9.2    EFFECT OF TERMINATION.  In the event of the termination
and abandonment of this Agreement pursuant to Section 9.1 hereof, this
Agreement, except for the provisions of this Section 9.2 and Section 10.10
hereof, shall forthwith become void and have no effect, without any liability on
the part of any party or its directors, officers or shareholders; PROVIDED,
HOWEVER, that nothing in this Section 9.2 shall relieve any party to this
Agreement of liability for any willful or intentional breach of this Agreement.

          SECTION 9.3    AMENDMENT.  To the extent permitted by applicable law,
this Agreement may be amended by action taken by or on behalf of the Boards of
Directors of the Company, Parent and Merger Sub at any time before or after
adoption of this Agreement by the shareholders of the Company.  This Agreement
may not be amended except by an instrument in writing signed on behalf of all
the parties.

          SECTION 9.4    EXTENSION; WAIVER.  At any time prior to the Control
Date, the parties hereto, by action taken by or on behalf of the respective
Boards of Directors of the Company, Parent or Merger Sub, may (i) extend the
time for the performance of any of the obligations or 

                                       46

<PAGE>

other acts of the other parties hereto, (ii) waive any inaccuracies in the
representations and warranties contained herein by any other applicable party or
in any document, certificate or writing delivered pursuant hereto by any other
applicable party or (iii) waive compliance with any of the agreements or
conditions contained herein.  Any agreement on the part of any party to any such
extension or waiver shall be valid only if set forth in an instrument in writing
signed on behalf of such party.  The failure of any party to assert any of its
rights hereunder shall not constitute a waiver of such rights.


                                    ARTICLE X

                                  MISCELLANEOUS

          SECTION 10.1   NON-SURVIVAL OF REPRESENTATIONS AND WARRANTIES.  No
representations or warranties shall survive beyond the Acceptance Date and no
covenants made in this Agreement shall survive beyond the Control Date;
PROVIDED, HOWEVER, that this Section 10.1 shall not limit any covenant or
agreement of the parties hereto which by its terms contemplates performance
after the Effective Time, including, without limitation, the covenants contained
in Sections 7.5 and 10.10.

          SECTION 10.2   ENTIRE AGREEMENT; ASSIGNMENT.  This Agreement
(a) constitutes the entire agreement among the parties with respect to the
subject matter hereof and supersedes all other prior agreements and
understandings, both written and oral, among the parties or any of them with
respect to the subject matter hereof and (b) shall not be assigned by operation
of law or otherwise, provided that Parent or Merger Sub may assign any of their
rights and obligations to any wholly-owned, direct subsidiary of Parent but no
such assignment shall relieve Parent or Merger Sub of its obligations hereunder.

          SECTION 10.3   ENFORCEMENT OF THE AGREEMENT.  The parties hereto agree
that irreparable damage would occur in the event that any of the provisions of
this Agreement were not performed in accordance with their specific terms or
were otherwise breached.  It is accordingly agreed that the parties shall be
entitled to an injunction or injunctions to prevent breaches of this Agreement
and to enforce specifically the terms and provisions hereon in any Federal or
state court located in the State of New York (as to which the parties agree to
submit to jurisdiction for the purpose 

                                       47

<PAGE>

of such action), this being in addition to any other remedy to which they are
entitled at law or in equity.

          SECTION 10.4   VALIDITY.  The invalidity or unenforceability of any
provision of this Agreement shall not affect the validity or enforceability of
any other provisions of this Agreement, which shall remain in full force and
effect.  Each party agrees that, should any court of competent authority hold
any provision of this Agreement to be null, void or unenforceable, or order any
party to take any action inconsistent herewith or not to take any action
required herein, the other party shall not be entitled to specific performance
of such provision or to any other remedy, including, without limitation, money
damages, for breach hereof or of any other provision of this Agreement as a
result of such holding or order.

          SECTION 10.5   NOTICES.  All notices, requests, claims, demands and
other communications hereunder shall be in writing and shall be deemed to have
been duly given when delivered in person, by cable, telegram, telecopier, telex
or overnight courier, or by registered or certified mail (postage prepaid,
return receipt requested) to the respective parties as follows:

          if to Parent or Merger Sub:

          Pfizer Inc.
          235 East 42nd Street
          New York, New York  10017
          Attention:  Paul S. Miller, Esq.
                      Senior Vice President
                      and General Counsel

          with a copy to:

          Weil, Gotshal & Manges LLP
          767 Fifth Avenue
          New York, New York  10153
          Attention:  Dennis J. Block, Esq.

          if to the Company:

          Corvita Corporation
          8210 N.W. 27th Street
          Miami, Florida
          Attention:  Norman R. Weldon Ph.D.
                      President and 
                      Chief Executive Officer

                                       48

<PAGE>

          with a copy to:

          Epstein, Becker & Green, P.C.
          250 Park Avenue
          New York, New York 10177
          Attention:  Lowell S. Lifschultz, Esq.

or to such other address as the person to whom notice is given may have
previously furnished to the others in writing in the manner set forth above
(provided that notice of any change of address shall be effective only upon
receipt thereof).  All such notices or communications shall be deemed to be
received (a) in the case of personal delivery, cable, telex or telecopy, on the
date of such delivery, (b) in the case of overnight courier, on the next
business day after the date when sent and (c) in the case of registered or
certified mailing, on the third business day following the date on which the
piece of mail containing such communication was posted.

          SECTION 10.6   GOVERNING LAW.  This Agreement shall be governed by and
construed in accordance with the laws of the State of New York regardless of the
laws that might otherwise govern under principles of conflicts of laws
applicable thereto, provided that matters affecting the validity of the
corporate action taken by the Company, Parent or Merger Sub relating to the
Merger shall be governed by the laws of the State of Florida.

          SECTION 10.7   DESCRIPTIVE HEADINGS.  The descriptive headings herein
are inserted for convenience of reference only and are not intended to be part
of or to affect the meaning or interpretation of this Agreement.

          SECTION 10.8   PARTIES IN INTEREST.  This Agreement shall be binding
upon and inure solely to the benefit of each party hereto, and nothing in this
Agreement, express or implied, is intended to confer upon any other person any
rights or remedies of any nature whatsoever under or by reason of this Agreement
except for Sections 3.1, 3.2 and Article IV and, in respect of the indemnified
parties only, 7.5.

          SECTION 10.9   COUNTERPARTS.  This Agreement may be executed in
counterparts, each of which shall be deemed to be an original, but all of which
shall constitute one and the same agreement.

                                       49

<PAGE>

          SECTION 10.10  FEES AND EXPENSES.  (a)  If this Agreement or the
transactions contemplated hereby are terminated for any of the following reasons

                (i)  such termination occurs pursuant to Section 9.1(e),

               (ii)  such termination occurs pursuant to Section 9.1(f), or 

              (iii)  such termination occurs pursuant to Section 9.1(g) as a
          result of an intentional material breach of this Agreement by the
          Company following (but not prior to) the Company's receipt of an
          Acquisition Proposal by any person or group other than Parent,

then the Company shall pay Parent a fee equal to $4 million, which fee shall be
inclusive of all Expenses (as defined below).

               (b)  As used herein, the term "Expenses" shall mean all of
Parent's, Merger Sub's and their affiliates' reasonable out-of-pocket expenses
(including all fees and expenses of counsel, accountants, experts, investment
bankers, financial and other consultants to Parent, Merger Sub and their
affiliates) incurred by them or on their behalf in connection with the
transactions contemplated by this Agreement, including, but not limited to, in
connection with the negotiation, preparation, execution and performance of this
Agreement and the Parent's due diligence investigation of the Company.

               (c)  Except as provided otherwise in Section 10.10(a) hereof, all
costs and expenses incurred in connection with this Agreement and the
transactions contemplated hereby shall be paid by the party incurring such costs
and expenses; PROVIDED, HOWEVER, that the costs of printing the Proxy Statement 
and in each case all exhibits, amendments or supplements thereto shall be borne
equally by the Company and Parent.

               (d)  Any payment required to be made pursuant to Section 10.10
shall be made as promptly as practicable but not later than five business days
after the occurrence of the event giving rise to such payment and shall be made
by wire transfer of immediately available funds to an account designated by
Parent, except that any payment to be made pursuant to Section 10.10(a)(i) shall
be made not later 

                                       50

<PAGE>

than the termination of this Agreement by the Company pursuant to Section
9.1(e).

          SECTION 10.11  PERFORMANCE BY MERGER SUB.  Subject to the terms
hereof, the Parent hereby agrees to cause Merger Sub to comply with its
obligations hereunder and to cause Merger Sub to consummate the Merger as
contemplated herein.

          SECTION 10.12  MATERIALITY.  The parties hereto agree that,
notwithstanding anything to the contrary contained herein, for purposes of this
Agreement, (a) the representations set forth in Sections 5.9(b)(i), 5.9(b)(ii)
and 5.9(b)(iii) are each, individually and in the aggregate, material
representations and warranties of the Company and (b) the failure of any one or
more of the Material Agreements to be in full force and effect or, if there
shall  have been any material breach by the Company or the other party thereto
which has not been cured, such breach, shall be deemed to cause the
representations and warranties in Sections 5.9(b)(i), 5.9(b)(ii) and 5.9(b)(iii)
to be untrue and incorrect in a manner which is reasonably likely to have a
Material Adverse Effect.

          SECTION 10.13  SUBSIDIARIES DEFINED.  For purposes of this agreement
"Subsidiaries" means with respect to any party, any corporation, partnership,
joint venture or other organization, whether incorporated or unincorporated, of
which (i) such party or any other subsidiary of such party is a general partner;
(ii) voting power to elect a majority of the board of directors or other
performing similar functions with respect to such corporation, partnership,
joint venture or other organization is held by such party or by any one or more
of its subsidiaries, or by such party and any one or more of its subsidiaries;
or (iii) at least 25% of the equity, or other securities or other interests is,
directly or indirectly, owned or controlled by such party or by any one or more
of its subsidiaries, or by such party and any one or more of its subsidiaries.

          SECTION 10.14  PUBLICITY.  So long as this Agreement is in effect,
each of the Parent and Merger Sub, on the one hand, and the Company, on the
other hand, promptly shall advise, consult and cooperate with the other prior to
issuing, or permitting any of its subsidiaries, directors, officers, employees
or agents to issue, any press release or other statement to the press or any
third party with respect to this Agreement, or the transactions contemplated
hereby.

                                       51

<PAGE>

          IN WITNESS WHEREOF, each of the parties has caused this Agreement to
be executed on its behalf by an officer thereof thereunto duly authorized, on
the day and year first above written.

                              PFIZER INC.


                              By:  /S/ PAUL S. MILLER                           
                                   --------------------------------------
                                   Name:  Paul S. Miller
                                   Title: Senior Vice
                                          President and
                                          General Counsel


                              HPG ACQUISITION CORP.


                              By:  /S/ GEORGE A. STEWART                        
                                   --------------------------------------
                                   Name:  George A. Stewart
                                   Title: President


                              CORVITA CORPORATION


                              By:  /S/ NORMAN R. WELDON                         
                                   --------------------------------------
                                   Name:  Norman R. Weldon
                                   Title: President and
                                          Chief Executive
                                          Officer

<PAGE>

                                                                         ANNEX A

                             CONDITIONS TO THE OFFER


          Notwithstanding any other provision of the Offer, Merger Sub shall not
be required to accept for payment or, subject to any applicable rules and
regulations of the SEC, including Rule 14e-1(c) under the Exchange Act, to pay
for any Shares tendered, and may postpone the acceptance for payment or, subject
to the restriction referred to above, payment for any Shares tendered, and,
subject to the provisions of the Merger Agreement, may terminate the Offer
(whether or not any Shares have theretofore been purchased or paid for), if, (1)
there have not been validly tendered and not withdrawn prior to the time the
Offer shall otherwise expire a number of Shares that constitutes a majority of
the Shares outstanding on a fully-diluted basis on the date of purchase ("on a
fully-diluted basis" meaning, as of any date, the number of Shares outstanding,
together with Shares the Company is then required to issue pursuant to
obligations outstanding at that date under employee stock option or other
benefit plans or otherwise), (2) any applicable waiting periods under the HSR
Act shall not have expired or been terminated prior to the expiration of the
Offer or any formal investigations relating to the Offer or the Merger that may
have been opened by the Department of Justice or the Federal Trade Commission
(by means of a written request for additional information or otherwise) shall
not have terminated, or (3) at any time before acceptance for payment of, of
payment for, such Shares, any of the following events shall occur or be deemed
to have occurred:

          (A)  there shall be pending any suit, action or proceeding by any
     governmental entity (1) challenging the acquisition by Parent or Merger Sub
     of any Shares under the Offer or seeking to restrain or prohibit the making
     or consummation of the Offer or Merger, (2) seeking to prohibit or
     materially limit the ownership or operation by the Company, Parent or any
     of their respective subsidiaries of a material portion of the business or
     assets of the Company and its subsidiaries, taken as a whole, or Parent and
     its subsidiaries, taken as a whole, or to compel the Company or Parent to
     dispose of or hold separate any material portion of the business or assets
     of the Company and its subsidiaries, taken as a whole, or Parent and its
     subsidiaries, taken as a whole, as a result of the Offer or any of the
     other transactions contemplated by this Agreement, 

                                       A-1

<PAGE>

     (3) seeking to impose material limitations on the ability of Parent or
     Merger Sub to acquire or hold, or exercise full rights of ownership of, any
     Shares accepted for payment pursuant to the Offer, including, without
     limitation, the right to vote such Shares on all matters properly presented
     to the shareholders of the Company, or (4) seeking to prohibit Parent or
     any of its subsidiaries from effectively controlling in any material
     respect any material portion of the business or operations of the Company
     and its subsidiaries; or

          (B)  any governmental entity or federal or state court of competent
     jurisdiction shall have enacted, issued, promulgated, enforced or entered
     any statute, rule, regulation, executive order, decree, injunction or other
     order that is in effect and that (1) materially restricts, prevents or
     prohibits consummation of the Offer, the Merger or any material transaction
     contemplated by the Merger Agreement, (2) prohibits or limits materially
     the ownership or operation by the Company, Parent or any of their
     subsidiaries of all or any material portion of the business or assets of
     the Company and its subsidiaries taken as a whole, or compels the Company,
     Parent or any of their subsidiaries to dispose of or hold separate all or
     any material portion of the business or assets of the Company and its
     subsidiaries taken as a whole, (3) imposes material limitations on the
     ability of Parent or any of its subsidiaries to exercise effectively full
     rights of ownership of any Shares, including, without limitation, the right
     to vote any Shares acquired by Merger Sub pursuant to the Offer or
     otherwise on all matters properly presented to the Company's shareholders,
     including, without limitation, the approval and adoption of the Merger
     Agreement and the transactions contemplated by the Merger Agreement, or (4)
     requires divestitures by Parent, Merger Sub or any other affiliate of
     Parent of any Shares; provided that Parent shall have used all reasonable
     efforts to cause any such decree, judgment, injunction or other order to be
     vacated or lifted; or

          (C)  the representations and warranties of the Company in the Merger
     Agreement were untrue or incorrect in a manner which is reasonably likely
     to have an adverse change in or effect on the condition (financial or
     otherwise), business, assets or results of operations of the Company and
     its subsidiaries taken 

                                       A-2

<PAGE>

     as a whole on the Company ("Material Adverse Effect") when made or (except
     for those that address matters as of a specific date and except for changes
     specifically permitted by the Merger Agreement) thereafter become and
     remain untrue or incorrect in a manner which is reasonably likely to have a
     Material Adverse Effect; or

          (D)  the Company shall have breached or failed to comply in any
     material respect with any of its obligations under the Merger Agreement
     and, with respect to any such breach or failure that can be remedied, the
     breach or failure is not remedied within 10 business days after Parent has
     furnished the Company written notice of such breach or failure; or

          (E)  the Merger Agreement shall have been terminated in accordance
     with its terms; or

          (F)  the board of directors of the Company shall have withdrawn or
     materially modified or changed (including by amendment of the Schedule 14D-
     9) in a manner adverse to Merger Sub its recommendation of the Offer, the
     Merger Agreement or the Merger, or the board of directors of the Company
     shall have approved or recommended any Acquisition Proposal; or

          (G)  it shall have been publicly disclosed or Merger Sub shall have
     otherwise learned that any person or "group" (as defined in section
     13(d)(3) of the Exchange Act), other than Parent or its affiliates or any
     group of which any of them is a member, shall have acquired beneficial
     ownership (determined pursuant to Rule 13d-3 under the Exchange Act) of
     more than 25 percent of the Shares, through the acquisition of stock, the
     formation of a group or otherwise, or shall have been granted an option,
     right or warrant, conditional or otherwise, to acquire beneficial ownership
     of more than 25 percent of the Shares; or

          (H)  there shall have occurred and continued for at least three
     business days (1) any general suspension of, or limitation on prices for,
     trading in securities on any national securities exchange or in the over-
     the-counter market in the United States, (2) the declaration of any banking
     moratorium or any suspension of payments in respect of banks, or any
     limitation (whether or not mandatory) by any governmental entity on, or
     other event materially adversely affecting, the 

                                       A-3

<PAGE>

     extension of credit by lending institutions in the United States or (3) in
     the case of any of the foregoing existing at the time of the commencement
     of the Offer, a material acceleration or worsening thereof;

which, in the judgment of Parent in any such case, and regardless of the
circumstances (including any action or omission by Parent or Merger Sub) giving
rise to any such condition, makes it inadvisable to proceed with such acceptance
for payment or payments.

          The foregoing conditions are for the sole benefit of Parent, Merger
Sub and their affiliates and may be asserted by Parent or Merger Sub regardless
of the circumstances (including, without limitation, any action or inaction by
Parent, Merger Sub or any of their affiliates) giving rise to any such condition
or may be waived by Parent or Merger Sub, in whole or in part, from time to time
in its sole discretion, except as otherwise provided in the Merger Agreement.
The failure by Parent or Merger Sub at any time to exercise any of the foregoing
rights shall not be deemed a waiver of any such right and each such right shall
be deemed an ongoing right and may be asserted at any time and from time to
time.  Unless otherwise defined in this Exhibit A, capitalized terms used in
this Exhibit A have the meanings ascribed to them in the Merger Agreement among
Parent, Merger Sub and the Company to which this Exhibit A is attached (the
"Merger Agreement").

                                       A-4

 

<PAGE>

                             SHAREHOLDERS AGREEMENT

          AGREEMENT, dated as of April 11, 1996, among Pfizer Inc., a Delaware
corporation ("PARENT"), HPG Acquisition Corp., a Florida corporation and a
direct wholly-owned subsidiary of Parent ("MERGER SUB"), and the other parties
signatory hereto (each a "SHAREHOLDER", and collectively, the "SHAREHOLDERS").

                              W I T N E S S E T H:

          WHEREAS, concurrently herewith, Parent, Merger Sub and Corvita
Corporation, a Florida corporation (the "COMPANY"), are entering into an
Agreement and Plan of Merger (as such agreement may hereafter be amended from
time to time, the "MERGER AGREEMENT"; capitalized terms used and not defined
herein have the respective meanings ascribed to them in the Merger Agreement),
pursuant to which, among other things, Merger Sub will be merged with and into
the Company (the "MERGER");

          WHEREAS, in furtherance of the Merger, Parent and the Company have
agreed that as soon as practicable (and not later than five business days) after
the first public announcement of the execution and delivery of the Merger
Agreement, Merger Sub will commence a cash tender offer to purchase all
outstanding shares of Company Common Stock (as defined in Section 1), including
all of the Shares (as defined in Section 2) Beneficially Owned (as defined in
Section 1) by the Shareholders; and

          WHEREAS, as an inducement and a condition to entering into the Merger
Agreement, Parent has required that the Shareholders agree, and the Shareholders
have agreed, to enter into this Agreement;

          NOW, THEREFORE, in consideration of the foregoing and the mutual
premises, representations, warranties, covenants and agreements contained
herein, the parties hereto, intending to be legally bound, hereby agree as
follows:

          1.   DEFINITIONS.  For purposes of this Agreement:

          (a)  "BENEFICIALLY OWN" or "BENEFICIAL OWNERSHIP" with respect to any
securities shall mean having "beneficial ownership" of such securities as
determined pursuant to Rule 13d-3 under the Securities Exchange Act of 1934, as
amended (the "EXCHANGE ACT"), including pursuant to any agreement, arrangement
or understanding, whether or not in writing.  Without duplicative counting of
the same securities by the same holder, securities Beneficially Owned by a
Person shall include securities Beneficially Owned by all other Persons with
whom such Person would constitute a "group" as within the meaning of Section
13(d)(3) of the Exchange Act.

          (b)  "COMPANY COMMON STOCK" shall mean at any time the common stock,
$.001 par value, of the Company.
<PAGE>

          (c)  "PERSON" shall mean an individual, corporation, partnership,
joint venture, association, trust, unincorporated organization or other entity.

          2.   TENDER OF SHARES.

          (a)  Each Shareholder hereby agrees to validly tender (and not to
withdraw) pursuant to and in accordance with the terms of the Offer, not later
than the fifth business day after commencement of the Offer pursuant to Section
1.1 of the Merger Agreement and Rule 14d-2 under the Exchange Act, the number of
shares of Company Common Stock set forth opposite such Shareholder's name on
Schedule I hereto (the "EXISTING SHARES" and, together with any shares of
Company Common Stock acquired by such Shareholder after the date hereof and
prior to the termination of this Agreement, whether upon the exercise of
options, warrants or rights, the conversion or exchange of convertible or
exchangeable securities, or by means of purchase, dividend, distribution or
otherwise, the "SHARES").  Each Shareholder hereby acknowledges and agrees that
Merger Sub's obligation to accept for payment and pay for Shares in the Offer is
subject to the terms and conditions of the Offer.

          (b)  Each Shareholder hereby agrees to permit Parent and Merger Sub to
publish and disclose in the Offer Documents and, if approval of the Merger by
the Company's shareholders (other than Parent or any of its wholly-owned
subsidiaries) is required under applicable law, in the Proxy Statement
(including all documents and schedules filed with the SEC) his or its identity
and ownership of Company Common Stock and the nature of his or its commitments
under this Agreement.

          3.   PROVISIONS CONCERNING COMPANY COMMON STOCK.  Each Shareholder
hereby agrees that during the period commencing on the date hereof and
continuing until the first to occur of the Effective Time or termination of the
Merger Agreement in accordance with its terms, at any meeting of the holders of
Company Common Stock, however called, or in connection with any written consent
of the holders of Company Common Stock, such Shareholder shall vote (or cause to
be voted) the Shares held of record or Beneficially Owned by such Shareholder,
whether issued, heretofore owned or hereafter acquired, (i) in favor of the
Merger, the execution and delivery by the Company of the Merger Agreement and
the approval of the terms thereof and each of the other actions contemplated by
the Merger Agreement and this Agreement and any actions required in furtherance
thereof and hereof; (ii) against any action or agreement that would result in a
breach in any respect of any covenant, representation or warranty or any other
obligation or agreement of the Company under the Merger Agreement or this
Agreement (after giving effect to any materiality or similar qualifications
contained therein); and (iii) except as otherwise agreed to in writing in
advance by Parent, against the following actions (other than the Merger and the
transactions contemplated by the Merger Agreement):  (A) any extraordinary
corporate transaction, such as a merger, consolidation or other business
combination involving the Company or its subsidiaries; (B) a sale, lease or
transfer of a material amount of assets of the Company or its subsidiaries, or a
reorganization, recapitalization, dissolution or liquidation of the Company or
its subsidiaries; (C) (1) any change in a majority of the persons who constitute
the Board of Directors of the Company; (2) any change in the present
capitalization of the Company or any amendment of the Company's Articles of
Incorporation or Bylaws; (3) any other material change in the Company's
corporate structure or business; or (4) any


                                        2
<PAGE>

other action involving the Company or its subsidiaries which is intended, or
could reasonably be expected, to impede, interfere with, delay, postpone, or
materially adversely affect the Merger and the transactions contemplated by this
Agreement and the Merger Agreement.  Such Shareholder shall not enter into any
agreement or understanding with any person or entity the effect of which would
be inconsistent or violative of the provisions and agreements contained in this
Section 3.

          4.   ACQUIRED SHARES.  In order to induce Parent and Merger Sub to
enter into the Merger Agreement, each of the Shareholders hereby agrees that if
the Merger Agreement is terminated by Parent in accordance with any of Sections
9.1(f) or 9.1(g) thereof, or by the Company in accordance with Section 9.1(e)
thereof, and, during the period commencing on the date of such termination and
continuing until the first anniversary of the date hereof, the Shares are
disposed, transferred or sold ("Sale") to a Person (other than Parent or Merger
Sub) in a transaction in which there is, directly or indirectly, a change (x) in
the ownership of a majority of the Company Common Stock or (y) in a majority of
the individuals who constitute the Company's board of directors on the date
hereof, for a per share amount in excess of the Offer Consideration, Parent
shall be entitled to, and each Shareholder agrees to pay to Parent, an amount
per share in cash equal to 50% of the difference between the gross proceeds
received, or receivable, by such Shareholders in the Sale and the Offer Price.
Any such payment due and owing to Parent shall be made within three (3) days of
the Shareholders' receipt thereof.  Each of the Shareholders agrees to effect
any Sale of Shares (other than pursuant to the Merger Agreement) in an arms'
length bona fide transaction to an unaffiliated Person.

          5.   OTHER COVENANTS, REPRESENTATIONS AND WARRANTIES.  Each
Shareholder hereby represents and warrants to Parent as follows:

          (a)  OWNERSHIP OF SHARES.  Such Shareholder is either (i) the record
and Beneficial Owner of, or (ii) the Beneficial Owner but not the record holder
of, the number of Shares set forth opposite such Shareholder's name on Schedule
I hereto.  On the date hereof, the Existing Shares set forth opposite such
Shareholder's name on Schedule I hereto constitute all of the shares of
securities issued by the Company owned of record or Beneficially Owned by such
Shareholder.  Such Shareholder has sole voting power and sole power to issue
instructions with respect to the matters set forth in Sections 2 and 3 hereof,
sole power of disposition, sole power of conversion, sole power to demand
appraisal rights and sole power to agree to all of the matters set forth in this
Agreement, in each case with respect to all of the Existing Shares set forth
opposite such Shareholder's name on Schedule I hereto, with no limitations,
qualifications or restrictions on such rights, subject to applicable securities
laws and the terms of this Agreement.

          (b)  POWER; BINDING AGREEMENT.  Such Shareholder has the legal
capacity, power and authority to enter into and perform all of such
Shareholder's obligations under this Agreement.  The execution, delivery and
performance of this Agreement by such Shareholder will not violate any other
agreement to which such Shareholder is a party including, without limitation,
any voting agreement, shareholders agreement or voting trust.  This Agreement
has been duly and validly executed and delivered by such Shareholder and
constitutes a valid and binding agreement of such Shareholder, enforceable
against such Shareholder in accordance with its terms.  There is no beneficiary
or holder of a voting trust certificate or other interest of any trust of which
such


                                        3
<PAGE>

Shareholder is Trustee whose consent is required for the execution and delivery
of this Agreement or the consummation by such shareholder of the transactions
contemplated hereby.

          (c)  NO CONFLICTS.  Except for filings under the HSR Act, if
applicable, (A) no filing with, and no permit, authorization, consent or
approval of, any state or federal public body or authority or any other Person
is necessary for the execution of this Agreement by such Shareholder and the
consummation by such Shareholder of the transactions contemplated hereby and
(B) none of the execution and delivery of this Agreement by such Shareholder,
the consummation by such Shareholder of the transactions contemplated hereby or
compliance by such Shareholder with any of the provisions hereof shall
(1) conflict with or result in any breach of any applicable organizational
documents applicable to such Shareholder, (2) result in a violation or breach
of, or constitute (with or without notice or lapse of time or both) a default
(or give rise to any third party right of termination, cancellation, material
modification or acceleration) under any of the terms, conditions or provisions
of any note, bond, mortgage, indenture, license, contract, commitment,
arrangement, understanding, agreement or other instrument or obligation of any
kind to which such Shareholder is a party or by which such Shareholder or any of
such Shareholder's properties or assets may be bound, or (3) violate any order,
writ, injunction, decree, judgment, order, statute, rule or regulation
applicable to such Shareholder or any of such Shareholder's properties or
assets.

          (d)  NO ENCUMBRANCES.  Except as applicable in connection with the
transactions contemplated by Section 2 hereof, such Shareholder's Shares and the
certificates representing such Shares are now, and at all times during the term
hereof will be, held by such Shareholder, or by a nominee or custodian for the
benefit of such Shareholder, free and clear of all liens, claims, security
interests, proxies, voting trusts or agreements, understandings or arrangements
or any other encumbrances whatsoever, except for any such encumbrances arising
hereunder.  The transfer by each Shareholder of his or its Shares to Merger Sub
in the Offer shall pass to and unconditionally vest in Merger Sub good and valid
title to the number of Shares set forth opposite such Shareholder's name on
Schedule I hereto, free and clear of all claims, liens, restrictions, security
interests, pledges, limitations and encumbrances whatsoever.

          (e)  NO FINDER'S FEES.  Other than existing financial advisory and
investment banking arrangements and agreements entered into by the Company no
broker, investment banker, financial adviser or other person is entitled to any
broker's, finder's, financial adviser's or other similar fee or commission in
connection with the transactions contemplated hereby based upon arrangements
made by or on behalf of such Shareholder.

          (f)  NO SOLICITATION.  No Shareholder shall, in his or its capacity as
such, directly or indirectly, solicit (including by way of furnishing
information) or respond to any inquiries or the making of any proposal by any
person or entity (other than Parent or any affiliate of Parent) with respect to
his or its Shares or with respect to the Company that constitutes an Acquisition
Proposal, except that a Shareholder who is a director of the Company may take
actions in such capacity to the extent permitted by the Merger Agreement.  If
any Shareholder receives any such inquiry or proposal, then such Shareholder
shall promptly inform Parent of the existence thereof.  Each Shareholder will
immediately cease and cause to be terminated any existing activities,
discussions or negotiations with any parties conducted heretofore with respect
to any of the foregoing.


                                        4
<PAGE>

          (g)  RESTRICTION ON TRANSFER, PROXIES AND NON-INTERFERENCE.  Except as
applicable in connection with the transactions contemplated by Section 2 hereof,
no Shareholder shall (i) directly or indirectly, offer for sale, sell, transfer,
tender, pledge, encumber, assign or otherwise dispose of, or enter into any
contract, option or other arrangement or understanding with respect to or
consent to the offer for sale, sale, transfer, tender, pledge, encumbrance,
assignment or other disposition of, any or all of such Shareholder's Shares or
any interest therein; (ii) except as contemplated by this Agreement, grant any
proxies or powers of attorney, deposit any Shares into a voting trust or enter
into a voting agreement with respect to any Shares; or (iii) take any action
that would make any representation or warranty of such Shareholder contained
herein untrue or incorrect or have the effect of preventing or disabling such
Shareholder from performing such Shareholder's obligations under this Agreement.

          (h)  WAIVER OF APPRAISAL RIGHTS.  Each Shareholder hereby waives any
rights of appraisal or rights to dissent from the Merger that such Shareholder
may have.

          (i)  RELIANCE BY PARENT.  Such Shareholder understands and
acknowledges that Parent is entering into, and causing Merger Sub to enter into,
the Merger Agreement in reliance upon such Shareholder's execution and delivery
of this Agreement.

          (j)  FURTHER ASSURANCES.  From time to time, at the other party's
request and without further consideration, each party hereto shall execute and
deliver such additional documents and take all such further lawful action as may
be necessary or desirable to consummate and make effective, in the most
expeditious manner practicable, the transactions contemplated by this Agreement.

          6.   STOP TRANSFER; CHANGES IN SHARES.  Each Shareholder agrees with,
and covenants to, Parent that such Shareholder shall not request that the
Company register the transfer (book-entry or otherwise) of any certificate or
uncertificated interest representing any of such Shareholder's Shares, unless
such transfer is made in compliance with this Agreement (including the
provisions of Section 2 hereof).  In the event of a stock dividend or
distribution, or any change in the Company Common Share by reason of any stock
dividend, split-up, recapitalization, combination, exchange of shares or the
like, the term "SHARES" shall be deemed to refer to and include the Shares as
well as all such stock dividends and distributions and any shares into which or
for which any or all of the Shares may be changed or exchanged.

          7.   TERMINATION.  Except as otherwise provided herein, the covenants
and agreements contained herein with respect to the Shares shall terminate upon
the earlier of (x) the Effective Time and (y) the first anniversary of the date
hereof; provided, however, that the provisions of Sections 5(f), 5(g)(i) and
5(g)(ii) shall terminate upon any earlier termination of the Merger Agreement.

          8.   SHAREHOLDER CAPACITY.  No person executing this Agreement who is
or becomes during the term hereof a director of the Company makes any agreement
or understanding herein in his or her capacity as such director.


                                        5
<PAGE>

          9.   CONFIDENTIALITY.  The Shareholders recognize that successful
consummation of the transactions contemplated by this Agreement may be dependent
upon confidentiality with respect to the matters referred to herein.  In this
connection, pending public disclosure thereof, each Shareholder hereby agrees
not to disclose or discuss such matters with anyone not a party to this
Agreement (other than such Shareholder's counsel and advisors, if any) without
the prior written consent of Parent, except for filings required pursuant to the
Exchange Act and the rules and regulations thereunder or disclosures such
Shareholder's counsel advises are necessary in order to fulfill such
Shareholder's obligations imposed by law, in which event such Shareholder shall
give notice of such disclosure to Parent as promptly as practicable.

          10.  MISCELLANEOUS.

          (a)  ENTIRE AGREEMENT.  This Agreement and the Merger Agreement
constitute the entire agreement between the parties with respect to the subject
matter hereof and supersedes all other prior agreements and understandings, both
written and oral, between the parties with respect to the subject matter hereof.

          (b)  CERTAIN EVENTS.  Each Shareholder agrees that this Agreement and
the obligations hereunder shall attach to such Shareholder's Shares and shall be
binding upon any person or entity to which legal or beneficial ownership of such
Shares shall pass, whether by operation of law or otherwise, including, without
limitation, such Shareholder's heirs, guardians, administrators or successors.
Notwithstanding any transfer of Shares, the transferor shall remain liable for
the performance of all obligations under this Agreement of the transferor.

          (c)  ASSIGNMENT.  This Agreement shall not be assigned by operation of
law or otherwise without the prior written consent of the other party, provided
that Parent may assign, in its sole discretion, its rights and obligations
hereunder to any direct or indirect wholly owned subsidiary of Parent, but no
such assignment shall relieve Parent of its obligations hereunder if such
assignee does not perform such obligations.

          (d)  AMENDMENTS, WAIVERS, ETC.  This Agreement may not be amended,
changed, supplemented, waived or otherwise modified or terminated, with respect
to any one or more Shareholders, except upon the execution and delivery of a
written agreement executed by the relevant parties hereto; PROVIDED that
Schedule I hereto may be supplemented by Parent by adding the name and other
relevant information concerning any shareholder of the Company who agrees to be
bound by the terms of this Agreement without the agreement of any other party
hereto, and thereafter such added shareholder shall be treated as a
"Shareholder" for all purposes of this Agreement.

          (e)  NOTICES.  All notices, requests, claims, demands and other
communications hereunder shall be in writing and shall be given (and shall be
deemed to have been duly received if so given) by hand delivery, telegram, telex
or telecopy, or by mail (registered or certified mail, postage prepaid, return
receipt requested) or by any courier service, such as Federal Express, providing
proof of delivery.  All communications hereunder shall be delivered to the
respective parties at the following addresses:


                                        6
<PAGE>

     If to Shareholders: At the addresses set forth on Schedule I hereto

          copy to:       Epstein, Becker & Green, P.C.
                         250 Park Avenue
                         New York, New York  10177
                         Attention:  Lowell S. Lifschultz, Esq.

          If to Parent:  Pfizer Inc.
                         235 East 42nd Street
                         New York, New York  10017-5755
                         Attention:  Paul S. Miller, Esq.
                                     Senior Vice President
                                     and General Counsel

          copy to:       Weil, Gotshal & Manges LLP
                         767 Fifth Avenue
                         New York, New York  10153
                         (212) 310-8000 (telephone)
                         (212) 310-8007 (telecopier)
                         Attention:  Dennis J. Block, Esq.

or to such other address as the person to whom notice is given may have
previously furnished to the others in writing in the manner set forth above.

          (f)  SEVERABILITY.  Whenever possible, each provision or portion of
any provision of this Agreement will be interpreted in such manner as to be
effective and valid under applicable law but if any provision or portion of any
provision of this Agreement is held to be invalid, illegal or unenforceable in
any respect under any applicable law or rule in any jurisdiction, such
invalidity, illegality or unenforceability will not affect any other provision
or portion of any provision in such jurisdiction, and this Agreement will be
reformed, construed and enforced in such jurisdiction as if such invalid,
illegal or unenforceable provision or portion of any provision had never been
contained herein.

          (g)  SPECIFIC PERFORMANCE.  Each of the parties hereto recognizes and
acknowledges that a breach by it of any covenants or agreements contained in
this Agreement will cause the other party to sustain damages for which it would
not have an adequate remedy at law for money damages, and therefore each of the
parties hereto agrees that in the event of any such breach the aggrieved party
shall be entitled to the remedy of specific performance of such covenants and
agreements and injunctive and other equitable relief in addition to any other
remedy to which it may be entitled, at law or in equity.

          (h)  REMEDIES CUMULATIVE.  All rights, powers and remedies provided
under this Agreement or otherwise available in respect hereof at law or in
equity shall be cumulative and not alternative, and the exercise of any thereof
by any party shall not preclude the simultaneous or later exercise of any other
such right, power or remedy by such party.


                                        7
<PAGE>

          (i)  NO WAIVER.  The failure of any party hereto to exercise any
right, power or remedy provided under this Agreement or otherwise available in
respect hereof at law or in equity, or to insist upon compliance by any other
party hereto with its obligations hereunder, and any custom or practice of the
parties at variance with the terms hereof, shall not constitute a waiver by such
party of its right to exercise any such or other right, power or remedy or to
demand such compliance.

          (j)  NO THIRD PARTY BENEFICIARIES.  This Agreement is not intended to
be for the benefit of, and shall not be enforceable by, any person or entity who
or which is not a party hereto.

          (k)  GOVERNING LAW.  This Agreement shall be governed and construed in
accordance with the laws of the State of New York, without giving effect to the
principles of conflicts of law thereof.

          (l)  DESCRIPTIVE HEADINGS.  The descriptive headings used herein are
inserted for convenience of reference only and are not intended to be part of or
to affect the meaning or interpretation of this Agreement.

          (m)  COUNTERPARTS.  This Agreement may be executed in counterparts,
each of which shall be deemed to be an original, but all of which, taken
together, shall constitute one and the same Agreement.



                                        8
<PAGE>

          IN WITNESS WHEREOF, Parent, Merger Sub and each Shareholder have
caused this Agreement to be duly executed as of the day and year first above
written.

                                   PFIZER INC.


                                   By: /s/ Paul S. Miller
                                       ----------------------------------
                                       Name:  Paul S. Miller
                                       Title: Senior Vice President and
                                              General Counsel

                                   HPG ACQUISITION CORP.



                                   By: /s/ George A. Stewart
                                       ----------------------------------
                                       Name:  George A. Stewart
                                       Title: President



                                   /s/ Norman R. Weldon
                                   --------------------------------------
                                   Norman R. Weldon, Ph.D.



                                   /s/ David C. MacGregor
                                   --------------------------------------
                                   David C. MacGregor, M.D.



                                   /s/ Leonard Pinchuk
                                   --------------------------------------
                                   Leonard Pinchuk, Ph.D.


                                   WestMed Venture Partners, L.P.



                                   By: /s/ Hal S. Watts
                                       ----------------------------------
                                       Name:  Hal S. Watts
                                       Title:


                                        9
<PAGE>


                                   Trinity Ventures II, L.P.



                                   By: /s/ David Nierenberg
                                       ----------------------------------
                                       Name:  David Nierenberg
                                       Title:    General Partner



                                   /s/ Bruce A. Weber
                                   --------------------------------------
                                   Bruce A. Weber



                                   /s/ Herbert Kontges
                                   --------------------------------------
                                   Herbert Kontges



                                   /s/ John B. Martin
                                   --------------------------------------
                                   John B. Martin



                                   /s/ Karen C. Vinjamuri
                                   --------------------------------------
                                   Karen C. Vinjamuri





AGREED TO AND ACKNOWLEDGED
(with respect to Section 6):


CORVITA CORPORATION


By:/s/ Norman R. Weldon
   --------------------------
      Name:  Norman R. Weldon
      Title: President and
             Chief Executive Officer


                                       10
<PAGE>

                                  SCHEDULE I TO
                             SHAREHOLDERS AGREEMENT


                                                        Percentage of Out-
Name and Address                     Number of         standing Common Stock
of Shareholder                     Shares Owned       (to nearest hundredth)
- ----------------                   ------------       ----------------------

Norman R. Weldon, Ph.D.               489,250                   6.88%
c/o Corvita Corporation
8210 N.W. 27th Street
Miami, FL 33122
(W):  (305) 599-3100 x801
(F):  (305) 599-9301

David C. MacGregor, M.D.              154,539                   2.17%
c/o Corvita Corporation
8210 N.W. 27th Street
Miami, FL 33122
(W):  (305) 599-3100
(F):  (305) 599-9301

Leonard Pinchuk, Ph.D.                 50,850                   0.72%
c/o Corvita Corporation
8210 N.W. 27th Street
Miami, FL 33122
(W):  (305) 599-3100
(F):  (305) 599-9301

WestMed Venture Partners, L.P.        410,765                   5.78%
c/o Corvita Corporation
8210 N.W. 27th Street
Miami, FL 33122
(W):  (305) 599-3100
(F):  (305) 599-9301

Trinity Ventures II, L.P.             240,987                   3.39%
c/o Trinity Ventures
155 Bovet Road, Suite 660
San Mateo, CA 94402
Attention:  David Nierenberg
(W):  (415) 358-9700
(F):  (415) 358-9785


                                       11
<PAGE>

                                                        Percentage of Out-
Name and Address                     Number of         standing Common Stock
of Shareholder                     Shares Owned       (to nearest hundredth)
- ----------------                   ------------       ----------------------

Bruce A. Weber                         20,000                   0.28%
c/o Corvita Corporation
8210 N.W. 27th Street
Miami, FL 33122
(W):  (305) 599-3100
(F):  (305) 599-9301

Herbert Kontges                        45,000                   0.63%
c/o Corvita Corporation, S.A.
40 Avenue Joseph Wybran
Erasmus Technology Center
Brussels 1070, Belgium
(W):  011-322-521-6940
(F):  011-322-521-6591

John B. Martin                         58,450                   0.82%
c/o Corvita Corporation
8210 N.W. 27th Street
Miami, FL 33122
(W):  (305) 599-3100
(F):  (305) 599-9301

Karen C. Vinjamuri                     17,450                   0.25%
c/o Corvita Corporation
8210 N.W. 27th Street
Miami, FL 33122
(W):  (305) 599-3100 x404
(F):  (305) 599-9301

     TOTAL:                         1,487,291                  20.93%
                                    ---------                  -----
                                    ---------                  -----


                                       12

<PAGE>

THE PROMISSORY NOTE REPRESENTED HEREBY WAS ORIGINALLY ISSUED ON APRIL 11, 1996,
AND HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND
MAY NOT BE RESOLD OR OTHERWISE TRANSFERRED WITHOUT COMPLIANCE THEREWITH OR
PURSUANT TO AN EXEMPTION THEREFROM.

                                 PROMISSORY NOTE


$2,000,000                                                    New York, New York
                                                                  April 11, 1996


          FOR VALUE RECEIVED, the undersigned Corvita Corporation, a Florida
corporation whose principal office is located at 8210 N.W. 27th Street, Miami,
Florida ("Payor"), does hereby promise to pay to Pfizer Inc., a Delaware
corporation whose principal office is located at 235 East 42nd Street, New York,
New York  10017 ("Payee"), in lawful money of the United States, in immediately
available funds, the principal amount of  TWO MILLION DOLLARS ($2,000,000),
together with interest thereon at a rate per annum equal to 8.25%, calculated on
the basis of a 360-day year for actual days elapsed.  Payment of the principal
amount of this Note shall be made upon demand of Payee at any time on or after
the earlier of (i) August 9, 1996, (ii) the termination of the Merger Agreement
(as hereinafter defined), or (iii) the consummation of the Merger contemplated
by and as defined in the Merger Agreement.  Interest shall be payable monthly in
arrears on the last day of each month.

          All loans made by the Payee to the Payor, and all payments made on
account of the principal thereof, shall be recorded by the Payee and, prior to
any transfer hereof, endorsed on this Note.

          The Payor agrees that so long as any amounts remain outstanding under
this Note, it will continue to operate its business in the ordinary course
consistent with past practice, including continuing to conduct clinical studies
and to perform Food and Drug Administration regulatory activities.

          Upon the occurrence of any of the following events:

          (i)   the failure by the Payor to comply with the covenant contained
in the preceding paragraph; or

          (ii)  the institution by or against the Payor of any proceeding
seeking to adjudicate the Payor a bankrupt or


<PAGE>

insolvent, or seeking liquidation, winding up, reorganization, arrangement,
adjustment, protection, relief of debtors, or seeking the entry of an order for
relief or the appointment of a receiver, trustee, custodian or other similar
official for the Payor or for any substantial party of its property;

then this Note shall become immediately due and payable, without presentment,
notice, demand or protest, all of which are waived by the Payor.

          This Note shall be binding upon and inure to the benefit of Payee and
Payor and their respective transferees, successors and assigns; PROVIDED,
HOWEVER, that Payor may not transfer or assign any of its rights or obligations
hereunder without the prior written consent of Payee.

          This Note may not be changed orally, but only by an agreement in
writing and signed by the party against whom enforcement of any waiver, change,
modification or discharge is sought.

          This Note shall be governed by, and construed in accordance with, the
laws of the State of New York.

          IN WITNESS WHEREOF, the Payor has caused this Note to be executed and
delivered by its duly authorized officer on the date first written above.

                                   CORVITA CORPORATION



                                   By:  /s/ Norman R. Weldon
                                        -----------------------------------
                                        Name:  Norman R. Weldon
                                        Title: President and
                                               Chief Executive
                                               Officer


                                        2

<PAGE>

                                  PFIZER, INC.
                              235 EAST 42ND STREET
                            NEW YORK, NEW YORK  10017

                                                                  April 11, 1996


Corvita Corporation
8210 N.W. 27th Street
Miami, Florida

Gentlemen:

          We hereby agree to make advances to Corvita Corporation (the "Company"
or "you") from time to time until the earlier to occur of (x) the termination of
the Agreement and Plan of Merger, dated as of April 11, 1996, among Pfizer Inc.,
HPG Acquisition Corp. and the Company (the "Merger Agreement") and (y) August 9,
1996, in an amount not to exceed $2,000,000.

          Subject to the terms set forth herein, funds shall be made available
to you on the business day subsequent to the business day on which we receive a
certificate, signed by the chief financial officer of the Company, requesting a
specified sum and certifying that (i) such amount will be used to pay (A)
obligations of the Company incurred in the ordinary course of business,
including payroll (but not bonuses), and other general and administrative
expenses (but not including fees payable to the Company's legal and financial
advisors), which obligations (including the name of each payee and the amounts
owed to each such payee) shall be set forth in a schedule attached to such
officer's certificate or (B) claims of the Company's creditors set forth on
Exhibit A hereto, and (ii) that the Company is in compliance with the covenant
contained in the Promissory Note referred to below.  Funds shall be advanced in
amounts not to exceed $150,000 once every five business days; PROVIDED, HOWEVER,
that an initial funding in an amount not to exceed $550,000 shall be advanced to
the Company upon its compliance with the terms hereof.

          Borrowings under this letter will be evidenced by your Promissory Note
to our order in the form attached hereto as Exhibit A.  All outstanding amounts
evidenced by the Note will bear interest at a rate per annum equal to 8.25%.
Interest shall be paid monthly in arrears on the last day of each month.


<PAGE>

          Please evidence your agreement by signing a counterpart of this
letter.

                              Very truly yours,

                              PFIZER INC.



                              By:  /s/ Paul S. Miller
                                   -----------------------------------------
                                   Title:  Senior Vice
                                           President and
                                           General Counsel


Accepted and Agreed:

CORVITA CORPORATION



By:  /s/ Norman R. Weldon
     -------------------------
     Title:  President and
             Chief Executive
             Officer


                                       2


<PAGE>

                                LICENSE AGREEMENT

          This Agreement, dated April 11, 1996 (this "Agreement"), is entered
into by and between Corvita Corporation, a corporation organized under the laws
of Florida and having its principal place of business at 8210 N.W. 27th Street,
Miami, Florida 33122 (the "Licensor") and Pfizer Inc., a corporation organized
under the laws of Delaware and having its principal place of business at 235
East 42nd Street, New York, New York  10017-5755 ("the Licensee").

WHEREAS:

          The Licensor is the owner of certain United States patents, and
foreign counterparts and applications for foreign counterparts of such patents,
covering a certain polycarbonate urethane material manufactured and sold by the
Licensor under the registered trademark "Corethane";

          The Licensee manufactures and sells urethane materials and therefore
desires a license under the Licensed Patents, subject to the terms and
conditions set forth in this Agreement, to manufacture and sell the Licensor's
polycarbonate urethane material;

          The Licensor, the Licensee and HPG Acquisition Corp., a corporation
organized under the laws of Florida and a direct wholly-owned subsidiary of the
Licensee, have entered into an Agreement and Plan of Merger dated April 11, 1996
(as such agreement may hereafter be amended from time to time, the "Merger
Agreement"; capitalized terms used and not defined herein have the respective
meanings ascribed to them in the Merger Agreement), pursuant to which, among
other things, HPG will be merged with and into the Licensor;

          Simultaneously herewith, the Licensor and the Licensee are entering
into a Loan Agreement (the "Loan Agreement") relating to the Licensee's
agreement, subject to certain conditions specified therein, to advance to the
Licensor not more than $2,000,000, and the Licensor has executed a Promissory
Note, of even date herewith (the "Promissory Note") in favor of the Licensee in
connection therewith;

          NOW THEREFORE, in consideration of the mutual representation,
warranties, covenants and agreements, including, but not limited to, the Loan
Agreement, and upon the terms and subject to the conditions hereinafter set
forth, the parties hereto do hereby agree as follows:

<PAGE>

                                    ARTICLE I
                                   DEFINITIONS

          1.1  AFFILIATE.  The term "Affiliate" shall mean, with respect to any
person or entity, any other person or entity that directly or indirectly
controls, is under common control with or is controlled by that person or
entity.  For purposes of this definition, "control" (including, with correlative
meaning, the terms "controlled by" and "under common control with"), as used
with respect to any person or entity, shall mean the possession, direct or
indirectly, of the power to direct or to cause the direction of the management
and policies of such person or entity, whether through the ownership of voting
securities, by contract or otherwise.

          1.2  CLAIM.  The term "Claim" shall mean a patent claim which has not
expired and which has not been disclaimed, canceled or finally held invalid or
unenforceable by a court or administrative body of competent jurisdiction from
which no further appeal is possible or has been taken within the time period
provided under applicable law for such appeal.

          1.3  EFFECTIVE DATE.  The "Effective Date" of this Agreement shall be
the date hereof.

          1.4  LICENSED DEVICE.  The term "Licensed Device" shall mean a device
containing one or more parts composed of, in whole or in part, a Licensed
Material.

          1.5  LICENSED KNOW-HOW.  The term "Licensed Know-How" shall mean
manufacturing know-how related to the manufacture of any Licensed Material,
which manufacturing know-how is known to Licensor on or around the Effective
Date of this Agreement.

          1.6  LICENSED MATERIAL.  The term "Licensed Material" shall mean a
polycarbonate urethane material that is covered by, whose method of making or
use is covered by, or that is a component of an article of manufacture covered
by at least one claim of a Licensed Patent and that is manufactured, used or
sold for any end-use.

                                        2

<PAGE>

          1.7  LICENSED PATENT.  The term "Licensed Patent" shall mean and
include any of the patents and patent applications listed on Exhibit A attached
hereto, and any counterparts, foreign equivalents, divisions and continuations-
in-part relating thereto, as licensed hereunder for any end-use; PROVIDED,
HOWEVER, that the term shall not include any improvements to any Licensed Patent
or to any Licensed Material invented by the Licensor or by any of its Affiliates
after the Effective Date. 

          1.8  LICENSED USE.  The term "Licensed Use" shall mean any use by a
User of a Licensed Material for the development, improvement, manufacture, sale,
or use of Licensed Devices.

          1.9  TERRITORY.  The term "Territory" shall mean a territory
consisting of all of the countries of the world.

          1.10 USER.  The term "User" shall mean any person or entity that uses
Licensed Material in the manufacture, sale and use of Licensed Devices.

                                   ARTICLE II
                                      GRANT

          2.1  WORLDWIDE LICENSE.

               (a)  LICENSED MATERIAL.  The Licensor hereby grants to the
Licensee the non-exclusive right and license under the Licensed Patents and the
Licensed Know-How to make, have made, use, sell and otherwise dispose of
Licensed Material during the term hereof throughout the Territory, subject to
all of the terms and conditions of this Agreement.  The foregoing grant excludes
the right to sublicense, with the following exceptions:

                    (i)  The Licensee shall have the right to sublicense any of
its rights under the foregoing grant to any one or more of its Affiliates, on
such terms and conditions as the Licensee in its sole discretion deems
appropriate, to the full extent, and subject to all of the limitations and
conditions of the grant to the Licensee hereunder. 

                    (ii)  In the event that the Licensor grants to any third
party, other than an Affiliate of the Licensor, a successor to any substantial
part of the business of the Licensor, or a successor to any substantial part of
the business of such an Affiliate, a license under the Licensed Patents and the
Licensed Know-How to make and sell (or to make, use, and sell) the Licensed
Material on terms and 

                                        3

<PAGE>

conditions that include rights to sublicense that are greater, broader, or in
addition to the sublicense rights granted in paragraphs 2.1(a)(i) and 2.1(a)(ii)
hereof, the Licensor will grant to the Licensee sublicense rights that are at
least as extensive as those granted to such third party.

          2.2  IMPROVEMENTS.

               (a)  LICENSOR'S IMPROVEMENTS.  All right, title and interest in
and to any improvements of the Licensed Patents or of the Licensed Material
invented by the Licensor or by any of its Affiliates after the Effective Date
shall remain the exclusive property of the Licensor and the Licensee shall not
be entitled to receive any license or other interest in such improvements.

               (b)  LICENSEE'S IMPROVEMENTS.  All right, title and interest in
and to any improvements of the Licensed Material invented by the Licensee or by
any of its Affiliates after the Effective Date shall remain the exclusive
property of the Licensee and the Licensor shall not be entitled to receive any
license or other interest in such improvements.

          2.3  EFFORTS.  The Licensee's only obligation under this Agreement
with respect to the promotion and marketing of Licensed Material is to use such
reasonable efforts as Licensee in the exercise of its sole discretion deems
appropriate.

          2.4  BANKRUPTCY.  The Licensor acknowledges that this Agreement
constitutes a license for "intellectual property" as that term is defined in
Section 365(n) of the U.S. Bankruptcy Code and all provisions of that Section
shall apply in the event of the Licensor's bankruptcy.


                                   ARTICLE III
                                     PAYMENT

          3.1  INITIAL PAYMENT.  No initial or other payment shall be payable by
the Licensee for the licenses granted hereunder, it being acknowledged that the
forgiveness of the principal and interest under the Promissory Note is full and
sufficient consideration for the licenses granted herein.

                                        4

<PAGE>

          3.2  ROYALTY.  No royalty shall be payable by the Licensee with
respect to Licensed Material made, sold or otherwise disposed of after the
Effective Date of this Agreement.


                                   ARTICLE IV
                         REPRESENTATIONS AND WARRANTIES

          4.1  LICENSOR'S REPRESENTATIONS.  The Licensor represents and warrants
to the Licensee as of the Effective Date that (a) the Licensor is the sole owner
of the Licensed Patents, (b) the Licensor has the right to grant to the Licensee
the rights and licenses granted hereunder, (c) no approvals or consents of any
governmental entity are necessary with respect to the execution and performance
by the Licensor of this Agreement and, (d) the Licensed Patents and the Licensed
Know-How are valid, sustaining, enforceable and do not infringe the rights of
any third party, and (e) to the best of the Licensor's knowledge, the
manufacture, use and sale of the Licensed Material as practiced commercially by
the Licensor on or around the Effective Date of this Agreement and its use in
the manufacture of Licensed Devices will not infringe the patents or other
intellectual property rights of third parties and no claim of any such
infringement or misappropriation has been made by any third party.

          4.2  MUTUAL REPRESENTATIONS.  The Licensor and the Licensee each
represent and warrant to the other as of the Effective Date that it has the full
power and authority to enter into this Agreement and carry out the transactions
and activities contemplated hereby.

          4.3  LICENSEE'S REPRESENTATIONS.  The Licensee represents and warrants
that (a) the Licensee has full power and authority to enter into and perform its
obligations under this Agreement, and (b) no approvals or consents of any
person, firm or governmental entity are necessary with respect to the execution
and performance by the Licensee of this Agreement.


                                    ARTICLE V
                            CONFIDENTIAL INFORMATION

          5.1  NON-DISCLOSURE OF CONFIDENTIAL INFORMATION.  Neither the Licensor
nor the Licensee shall disclose to any third party or use except in furtherance
of this Agreement any confidential information disclosed by the other 

                                        5

<PAGE>

party or its Affiliates in connection with the Agreement, except that either
party may disclose such confidential information to the extent necessary to
comply with an order of a court or a government agency PROVIDED THAT the
disclosing party shall use its reasonable best efforts to notify the other party
of the disclosing party's intention to make the disclosure, and shall provide
the other party with a copy of the court or government agency's order, identify
precisely the confidential information the disclosing party intends to disclose,
and cooperate with the other party in devising reasonable measures to protect
the confidentiality of such information including, but not limited to, obtaining
a protective order from the court or government agency that issued the order to
disclose.  For purposes of this Agreement, confidential information shall
include at least any customer list, and any non-patented technology, data, know-
how or technical information provided to the Licensee by the Licensor in
connection with this Agreement and performance of the transactions and
activities contemplated hereby.

          5.2  RETURN OF CONFIDENTIAL INFORMATION.  Upon the termination of this
Agreement for any reason prior to the expiration of its term, the Licensee shall
return to the Licensor all confidential information including, without
limitation, any customer list, and any non-patented technology, data, know-how
or technical information provided to the Licensee by the Licensor.

          5.3  NON-CONFIDENTIAL INFORMATION.  Neither any party nor the
inspector shall be under any obligation with respect to information of the other
party or, in the case of the inspector, information of the Licensee, which the
party receiving the information or the inspector can demonstrate, preferably by
reference to documents:

               (a)  through no act or failure on the part of the party receiving
the information or the inspector, becomes known or available to the public;

               (b)  is known by the party receiving the information or by the
inspector prior to its receiving such information from the other party; or

               (c)  is furnished to the party receiving the information or to
the inspector by any person not legally precluded from making disclosure of the
information without restriction.

                                        6

<PAGE>

                                   ARTICLE VI
                                    COVENANTS

          6.1  NO SUBLICENSES.  Except as set forth in paragraphs 2.1(a)(i) and
(ii) of this Agreement, or as permitted pursuant to the provisions of paragraph
2.1(a)(iii), the Licensee will not sublicense any of its rights hereunder to any
person or entity.

          6.2  REGULATORY SUBMISSIONS.

               (a)  LICENSOR DATA.  The Licensor's Device Master File shall
remain the property of the Licensor and shall remain confidential, proprietary
information of the Licensor.  The Licensee shall be allowed access to data
contained or referenced in the Licensor's Device Master File as of the Effective
Date for the purpose of establishing the Licensee's FDA Master File.

               (b)  LICENSEE DATA.  The Licensee's FDA Master File shall remain
the property of the Licensee and shall remain confidential, proprietary
information of the Licensee.  However, upon the request of any User or of the
Licensor, the Licensee will permit User or the Licensor to reference all data
that may be generated by or for the Licensee and contained in the Licensee's FDA
Master File demonstrating the safety of the Licensed Material.

               (c)  INVESTIGATIONAL DEVICE EXEMPTION.  The Licensor hereby
grants to the Licensee a right of reference to Investigational Device Exemption
#G950009 ("IDE"), and to all information contained in any application for such
IDE, and to any application or file to which such IDE refers.  The Licensor
hereby represents and warrants that it has full and complete authority to grant
this right of reference.  The Licensor further agrees to cooperate with the
Licensee in effectuating the provisions of this paragraph, including but not
limited to providing written documentation to be submitted to FDA confirming
this right of reference.

                                   ARTICLE VII
                               PATENT INFRINGEMENT
                                        
          7.1  PATENT ENFORCEMENT.  The Licensor shall have the first right to
institute patent infringement actions against third parties manufacturing or
marketing products, devices or instruments competitive with the Licensed Devices
based on any 

                                        7

<PAGE>

patents covering the Licensed Materials.  If the Licensor does not institute an
infringement proceeding against an offending third party within 30 days, the
Licensee shall have the right, but not the obligation, to institute such an
action.  Any award paid by third parties as a result of such an infringement
action (whether by way of settlement or otherwise), shall be paid to the party
who instituted and maintained such action.

          7.2  INDEMNITY FOR CLAIMS OF INFRINGEMENT.  The Licensor shall
indemnify, defend and hold harmless the Licensee, its Affiliates, its successors
and assigns, and their directors, officers, employees, agents and
representatives from and against any loss, damage, cost or expense of any kind
or nature (including reasonable attorneys' and other professionals' fees and
expenses) incurred as a result of or in responding to any demand, claim, action,
proceeding or suit that is brought or threatened to be brought against any of
them by any third party and that asserts a claim of patent infringement arising
from such third party's assertion of the ownership or co-ownership of rights in
or to or related to the Licensed Material; PROVIDED, HOWEVER, that the Licensor
shall have no obligation to indemnify any person or entity with respect to any
demand, claim, action, proceeding or suit that is brought or threatened to be
brought by any third party and that asserts a claim of patent infringement to
the extent the claim results from any modification of the Licensed Material from
the commercial practice of the Licensor on or around the Effective Date of this
Agreement.

                                  ARTICLE VIII
                            ASSIGNMENTS AND TRANSFERS

          8.1   TRANSFERS GENERALLY.  The Licensee shall not be permitted to
assign or transfer any of its rights, obligations or duties under this Agreement
without the express written consent of the Licensor.  The Licensor shall not be
permitted to assign or transfer any or all of its rights, obligations or duties
under this Agreement without the express written consent of the Licensee.


                                   ARTICLE IX
                              TERM AND TERMINATION

          9.1   TERM.  The term of this Agreement shall commence on the
Effective Date, and unless sooner terminated as herein provided, shall end on
the date 

                                        8

<PAGE>

on which the last to expire of the Licensed Patents covering the Licensed
Material expires.

          9.2   TERMINATION.  This Agreement may be terminated prior to the
expiration of its term (a) if mutually agreed by the parties in writing, (b) in
the event of the breach of this Agreement by either party, at the option of the
non-breaching party; PROVIDED that the non-breaching party has provided written
notice to the breaching party of the breach and the non-breaching party's
intention to terminate the Agreement, and the breaching party has failed to cure
its breach within ninety days following the date such notice was sent to the
breaching party, or (c) by the Licensor upon payment in full of the principal
amount outstanding under the Loan Agreement together with all interest thereon;
PROVIDED, HOWEVER, with respect to clause (c), that the Licensor makes such
payment to the Licensee in immediately available funds on or prior to the
earlier of (i) August 9, 1996 and (ii) forty-five calendar days after the Merger
Agreement is terminated in accordance with Section 9.1(a), 9.1(b), 9.1(c),
9.1(d), 9.1(g) or 9.1(h) thereof.  Notwithstanding anything to the contrary
contained in section 9.2(c) hereof, the Licensor shall not be entitled to
terminate this Agreement (x) if the Merger Agreement is terminated in accordance
with Section 9.1(e) or 9.1(f) thereof, or (y) upon the institution by or against
the Licensee of any proceeding seeking to adjudicate the Licensor a bankrupt or
insolvent, or seeking liquidation, winding up, reorganization, arrangement,
adjustment, protection, relief of debtors, or seeking the entry of an order for
relief or the appointment of a receiver, trustee, custodian or other similar
official for the Licensor or for any substantial part of its property.

          9.3   DISPOSITION OF LICENSED PATENTS.  In the event that this
Agreement is terminated prior to the expiration of its term pursuant to the
provisions of Section 9.2, all rights in and to the license granted hereunder
shall immediately revert to and become the property of the Licensor in
accordance with Section 9.2 hereofX, and the Licensee shall be obligated to
return all confidential information of the Licensor as provided in Section 5.2
hereof.

          9.4   SURVIVAL.  Any provision of this Agreement with respect to the
subject matter described in this Article IX shall continue in effect after the
expiration of the term of, or termination of, this Agreement to the extent
necessary to permit the complete fulfillment or discharge of any obligation that
so continues:

                                        9

<PAGE>

               (a)  Any agreement, including the provisions of Article V of this
Agreement, in effect at the time of such expiration or termination with respect
to confidential information of any party to this Agreement; and

               (b)  The indemnity for claims of infringement contained in
Article VII of this Agreement.

          9.5   SALES AFTER TERMINATION.  Upon termination or expiration of this
Agreement for any reason, the Licensee shall have the right to sell or otherwise
dispose of any stock of Licensed Material which it or any of its Affiliates has
in its possession or for which it has acquired constituent materials.

                                    ARTICLE X
                                  MISCELLANEOUS

          10.1   NOTICE.  Any notice given pursuant to this Agreement shall be
in writing and, except as otherwise expressly provided herein, shall be deemed
to have been duly delivered when it actually is delivered in person or by
facsimile transmission; seven days after it is mailed by certified or registered
mail, postage and mailing expense prepaid; and one day after it is sent by
overnight express mail or by overnight courier service (such as FedEx or DHL),
postage or shipping expense prepaid and designated for next-day delivery; and,
if given or rendered to

the Licensee, addressed to:

                                   Pfizer Inc.
                                   235 East 42nd Street
                                   New York, New York  10017
                                   Attention:   Paul S. Miller, Esq.
                                                Senior Vice President
                                                and General Counsel

                                   with a copy to:

                                   Weil, Gotshal & Manges LLP
                                   767 Fifth Avenue
                                   New York, New York  10153
                                   Attention:   Dennis J. Block, Esq.

                                       10

<PAGE>

or if given or rendered to the Licensor, addressed to:

                                   Corvita Corporation
                                   8210 N.W. 27th Street
                                   Miami, Florida
                                   Attention:   Norman R. Weldon, Ph.D.
                                                President and
                                                Chief Executive Officer

                                   with a copy to:

                                   Epstein, Becker & Green, P.C.
                                   250 Park Avenue
                                   New York, New York  10177
                                   Attention:  Lowell S. Lifschultz, Esq.

Either party may specify a different address by notice in writing in accordance
with this Section 10.1.

          10.2  ENTIRE AGREEMENT; AMENDMENT.  This agreement sets forth the
entire agreement and understanding between the parties as to the subject matter
hereof and has priority over any and all agreements, documents, verbal consents
or understandings previously made between the parties with respect to the
subject matter hereof.  None of the terms of this Agreement shall be amended or
modified except as set forth in a writing signed by both the Licensor and the
Licensee.

          10.3   WAIVER.  A waiver by any party of any term or condition of this
Agreement in any one instance shall not be deemed or construed to be a waiver of
such term or condition for any similar instance in the future or of any
subsequent breach thereof.  No failure by a party to take action against default
or breach of this Agreement shall constitute a waiver of such party's right to
enforce any provision of this Agreement or to take action against such default
or breach or against any subsequent default or breach.  All rights, remedies,
undertaking, obligations, and agreements contained in this Agreement shall be
cumulative and none of them shall be a limitation of any other remedy, right,
undertaking, obligation or agreement of any party.

          10.4   SEVERABILITY.  If, and solely to the extent that, any provision
of this Agreement shall be invalid or unenforceable, or shall render this entire

                                       11

<PAGE>

Agreement invalid or unenforceable, such offending provision shall be of no
effect and shall not affect the validity of the remainder of this Agreement or
of any of its other provisions.

          10.5   NO AGENCY.  Nothing in this Agreement shall be deemed to
appoint or authorize the Licensee to act as an agent of the Licensor or to
assume or incur any liability or obligation in the name of or on behalf of the
Licensor.

          10.6   DISCLAIMER.  LICENSOR HEREBY DISCLAIMS ALL WARRANTIES, WHETHER
EXPRESS OR IMPLIED, WRITTEN OR ORAL, WITH RESPECT TO THE LICENSED MATERIAL,
INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE,
INCLUDING, BUT NOT LIMITED TO, THE USE OF THE LICENSED MATERIAL IN IMPLANTABLE
DEVICES OR IN ANY OTHER MEDICAL APPLICATIONS.  IN NO EVENT SHALL LICENSOR BE
LIABLE FOR SPECIAL, INCIDENTAL, CONSEQUENTIAL, EXEMPLARY OR PUNITIVE DAMAGES,
INCLUDING, BUT NOT LIMITED TO, LOSS OF PROFITS.

          10.7   HEADINGS.  Headings in this Agreement are included for ease of
reference only and shall have no effect on the meaning or interpretation of this
Agreement.

          10.8   SINGULAR/PLURAL.  Whenever in the context it appears
appropriate, each term stated either in the singular or the plural shall include
both the singular and the plural.

          10.9   APPLICABLE LAW/JURISDICTION.  All disputes arising out of the
validity, interpretation or application of this Agreement shall be submitted to
the courts of competent jurisdiction sitting in the County and State of New
York.  This Agreement shall be interpreted and construed in accordance with the
law of New York, without reference to its conflicts of laws provisions.

          10.10   COUNTERPARTS.  This Agreement may be executed in any number of
counterparts, each of which shall be deemed an original but all of which
together shall constitute one and the same instrument.

          10.11   NO THIRD-PARTY BENEFICIARIES.  The provisions of this
Agreement are for the exclusive benefit of the parties hereto, and no other
person, 

                                       12

<PAGE>

firm, institution or other entity shall have any right or claim against any
party to this Agreement by reason of such provisions or shall be entitled to
enforce any such provision against any party.

                                       13

<PAGE>

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


                                   LICENSOR
                                   Corvita Corporation



                                   By: /S/ NORMAN R. WELDON           
                                       -------------------------------
                                   Title:    President and
                                             Chief Executive Officer


                                   LICENSEE
                                   Pfizer Inc.
                            


                                   By: /S/ PAUL S. MILLER             
                                       -------------------------------
                                   Title:    Senior Vice President
                                             and General Counsel

                                       14

<PAGE>

                                    EXHIBIT A
                                LICENSED PATENTS

U.S. Patent No. 5,133,742, L. Pinchuk, "Crack-Resistant Polycarbonate Urethane
                           Polymer Prostheses and the Like," July 28, 1992

U.S. Patent No. 5,229,431, L. Pinchuk, "Crack-Resistant Polycarbonate Urethane
                           Polymer Prostheses and the Like," July 28, 1993

U.S. Patent No. 4,810,749, L. Pinchuk, "Polyurethanes," March 7, 1989

All pending and issued reissues, re-examinations, divisions, continuations,
continuations-in-part, renewals, extensions and additions thereto, and all
foreign counterparts and applications for foreign counterparts of the foregoing.

                                       15

 

<PAGE>


                                        Pfizer Inc
                                        235 East 42nd Street
                                        New York, NY 10017
                                        ----------------------------------------
[Logo]                                  NEWS


For immediate release         Contact:
April 11, 1996                Bob Fauteux (Pfizer, New York) 212-573-3079
                              Andrew Heath (Pfizer, Brussels) 32-2-722-0853
                              Karen Vinjamuri (Corvita, Miami) 305-599-3100



                  PFIZER AGREES TO ACQUIRE CORVITA CORPORATION,
                 INNOVATOR IN TECHNOLOGIES FOR VASCULAR DISEASE


New York, April 11 -- Pfizer Inc (NYSE: PFE) and Corvita Corporation (Nasdaq:
CVTA) jointly announced today that they have signed a definitive merger
agreement pursuant to which Pfizer will acquire all of the outstanding stock of
Corvita at $10.25 per share, or approximately $85 million. To implement this
agreement Pfizer will commence a cash tender offer within five business days.
The completion of the tender offer is subject to a number of customary
conditions.

Based in Miami, Florida, Corvita develops, manufactures and markets synthetic
vascular grafts. These grafts are used in the treatment of severely diseased
arteries and are produced at Corvita's facilities in Miami and Brussels,
Belgium. Corvita is also developing combination stent/graft devices, which are
in clinical trails both in the U.S. and Europe.

Consummation of the merger is conditioned on, among other things, the tender of
at least a majority of the outstanding shares of Corvita, on a fully diluted
basis, in the tender offer. Shareholders owning approximately 20% of the
outstanding shares of Corvita have entered into binding agreements to tender
their shares.

Corvita will operate as a business of the Pfizer Hospital Products Group (HPG).

                                     (more)


<PAGE>

                                       -2-


"The acquisition of Corvita brings new products and biomaterials technologies
highly complementary to one of HPG's strategic emphases, interventional
cardiology and radiology," said P. Nigel Gray, vice president of Pfizer Inc and
president of the Pfizer Hospital Products Group. "In these rapidly growing
clinical specialties, Corvita's expertise in developing advanced stent/graft
devices adds significantly to the existing global strengths of our Schneider and
NAMIC businesses."

Corvita stent/graft devices may be implanted in diseased or damaged arteries,
for example, using minimally invasive techniques. Once in place, these devices
allow the unimpeded flow of blood.

"Corvita's technologies focus on the critical medical needs of thousands of
patients suffering from life-threatening vascular disease, including abdominal
aortic aneurysms, and trauma," said Robert Neimeth, executive vice president of
Pfizer Inc responsible for the Hospital Products and Animal Health Groups, and
president of the Pfizer International Pharmaceuticals Group. In the United
States each year, abdominal aortic aneurysm -- a weakening of the walls of one
of the body's main arteries, sometimes to the point of rupture -- afflicts an
estimated 190,000 people, often resulting in death.

Pfizer Inc is a research-based, diversified health-care company with global
operations. In 1995, the Company reported sales of over $10 billion and invested
more than $1.4 billion in research and development.

                                    # # # # #

<PAGE>

                     [Letterhead - Dillon, Read & Co. Inc.]


                    CONFIDENTIALITY AND STANDSTILL AGREEMENT

August 16, 1995

Pfizer Inc.
235 East 42nd Street
New York, NY 10017

Attention:  P. Nigel Gray
            President, Hospital Products Group


Ladies and Gentlemen:

We have advised you that Dillon, Read & Co. Inc. ("Dillon Read") is acting on
behalf of Corvita Corporation ("Corvita" or the "Company") with respect to your
discussions with the Company.  In connection with your analysis of a possible
acquisition transaction with the Company, you have requested certain oral and
written information concerning the Company from officers, directors, employees
and/or agents of the Company, including Dillon Read, to be disclosed pursuant to
this Agreement (collectively, the "Information").  As a condition to being
furnished with the information, you agree (and agree to cause your affiliates)
to treat the Information in accordance with the following:

     1.   The Information disclosed pursuant to this Agreement will be used
          solely for the purpose of evaluating a possible acquisition
          transaction between the Company and you and will not be used for any
          other purpose or in any way directly or indirectly in competition with
          or detrimental to the Company, and said Information will be kept
          confidential by you and your advisors and not be disclosed to any
          third party provided, however, that you may disclose the said
          Information or portions thereof to those of your directors, officers,
          employees and representatives (the persons to whom such disclosure is
          permissible being collectively called "Representatives") who need to
          know such Information for the sole purpose of evaluating your possible
          acquisition transaction with the Company (it being understood that
          those Representatives will be informed by you of the confidential
          nature of the Information and will agree to be bound by this agreement
          and shall be directed by you not to disclose the said Information to
          any other person).  You agree to be responsible for any breach of this
          agreement by your Representatives.
<PAGE>

Pfizer Inc.
August 16, 1995
Page 2

     In the event that you are requested or required (by oral questions,
     interrogatories, requests for information or documents, subpoenas, civil
     investigative demands or similar processes) to disclose any Information
     supplied to you pursuant to this Agreement it is agreed that you will (i)
     provide the Company with prompt notice of such request(s) and the documents
     requested so that the Company may seek an appropriate protective order
     and/or waive your compliance with the provisions of this agreement, and 
     (ii) take such legally available steps, as the Company may reasonably 
     request, to resist or narrow such request provided that any expenses 
     (including legal fees and expenses) incurred by you in carrying out the 
     Company's request will be reimbursed by the Company.  It is further 
     agreed that if in the absence of a protective order or the receipt of a 
     waiver hereunder you are nonetheless, in the reasonable written opinion of
     your legal counsel, compelled to disclose Information concerning the 
     Company to any tribunal or else stand liable for contempt or suffer other
     censure or penalty, you may disclose such Information to such tribunal 
     without liability hereunder; provided, however, that you shall give the 
     Company written notice of the Information to be so disclosed as far in 
     advance of its disclosure as is practicable, shall furnish only that 
     portion of the Information which is legally required, and shall take such
     steps as reasonably requested by the Company provided that any expenses 
     incurred by you in carrying out the Company's request shall be reimbursed
     by the Company.

2.   The term "Information" does not include any information which (i) is
     already in your possession on the date hereof, (ii) is or becomes generally
     available to and known by the public (other than as a result of a wrongful
     disclosure directly or indirectly by you or your Representatives), (iii)
     becomes available to you on a nonconfidential basis from a source other
     than the Company or its advisors, provided that such source is not and was
     not bound to your knowledge (after reasonable inquiry) by a confidentiality
     agreement with or other obligation of secrecy to the Company with respect
     thereto or (iv) is independently acquired or developed by you (which you
     can show through written documentation) without violating any
     confidentiality agreement with or other obligation of secrecy to the
     Company.

3.   When the Company so requests, you will return promptly to Dillon Read or
     the Company all copies, extracts or other reproductions in whole or in part
     of the Information in your possession or in the possession of your
     Representatives which was disclosed only pursuant to this Agreement, and
     you will destroy all copies of any memoranda, notes, analyses,
     compilations, studies or other documents prepared by you or for your use
     based on, containing or reflecting any Information which was disclosed only
     pursuant to this Agreement.  Such destruction shall, if requested, be
     certified in writing to Dillon Read or the Company by an authorized officer
     supervising such destruction.

4.   Without the prior written consent of the Company, you will not, and will
     direct your Representatives not to, disclose to any person either the fact
     that any investigation, discussions or negotiations are taking place
     concerning a possible acquisition transaction between the Company and you,
     or that you have requested or received Information from the Company or
     Dillon Read pursuant to this Agreement, or any of the terms, conditions or
     other facts with respect to any such possible acquisition transaction,
     including the status thereof.  The term "person" as used throughout this
     agreement will be interpreted broadly to

<PAGE>

Pfizer Inc.
August 16, 1995
Page 3



     include, without limitation, any corporation, company, partnership or
     individual, or any governmental instrumentality or any official or employee
     thereof.

     In addition, without the prior written consent of the Company, you will
     not, and will direct your Representatives not to, hold any discussion
     whatsoever with suppliers, customers and/or any other person with whom the
     Company has a relationship regarding any potential acquisition transaction
     involving the Company, the possible terms of any such acquisition
     transaction or the fact that any investigation, discussions or negotiations
     are taking place concerning a possible acquisition transaction between you
     and the Company.

5.   You understand and acknowledge that neither the Company nor Dillon Read is
     making any representation or warranty, express or implied, as to the
     accuracy or completeness of the Information, and none of the Company,
     Dillon Read, or any of their respective directors, officers, employees,
     stockholders, owners, affiliates or agents will have any liability to you 
     or any other person resulting from your use of the Information.  Only 
     those representations or warranties that are made to you in a definitive
     transaction agreement when, as, and if it is executed, and subject to such
     limitations and restrictions as may be specified in such definitive
     transaction agreement, will have any legal effect.

6.   You also understand and agree that unless and until a definitive
     transaction agreement has been executed and delivered, no contract or
     agreement providing for a transaction with the Company shall be deemed to
     exist between you and the Company, and neither the Company nor you will be
     under any legal obligation of any kind whatsoever with respect to such
     transaction by virtue of this or any written or oral expression thereof,
     except, in the case of this agreement, for the matters specifically agreed
     to herein.  For purposes of this paragraph, the term "definitive
     transaction agreement" does out include an executed letter of intent or any
     other preliminary written agreement, nor does it include any written or
     oral acceptance of an offer, bid proposal or expression of interest on your
     part.

7.   You agree that the Company shall be entitled to equitable relief, including
     injunction and specific performance, in the event of any breach of the
     provisions of this agreement, in addition to all other remedies available
     to the Company at law or in equity including, but not limited to,
     reasonable attorney's fees.  You also hereby irrevocably and
     unconditionally consent to submit to the jurisdiction of the courts of the
     State of Florida and Courts of the United States of America located in
     State of Florida for any actions, suits or proceedings arising out of or
     relating to this agreement (and you agree not to commence any action, suit
     or proceeding relating thereto except in such courts), and further agree
     that service of any process, summons, notice or document by U.S. registered
     mail to your address set forth above shall be effective service of process
     for any action, suit or proceeding brought against you in any such court.
     You hereby irrevocably and unconditionally waive any objection to the
     laying of venue of any action, suit or proceeding arising out of this
     agreement, in the courts of the State of Florida or of the United States of
     America located in the State of Florida, and hereby further irrevocably and
     unconditionally waive and agree not to plead or claim in any such court
     that any such action, suit or proceeding brought in any such court has been
     brought in inconvenient forum.

<PAGE>

Pfizer Inc.
August 16, 1995
Page 4

B.   You hereby acknowledge that you are aware that the securities laws of the
     United States prohibit any person who has material, non-public information
     concerning the Company or a possible transaction involving the Company from
     purchasing or selling securities of the Company in reliance upon such
     information or from communicating such information to any other person or
     entity under circumstances in which it is reasonably foreseeable that such
     person or entity is likely to purchase or sell such securities in reliance
     upon such information.

     You agree that, for a period of two years from the date of this agreement,
     unless such action shall have been specifically approved in writing by the
     Board of Directors of the Company, none of you, any of your affiliates or
     any Representatives will in any manner, directly or indirectly, (a) effect
     or seek, offer or propose (whether publicly or otherwise) to effect,
     participate in or cause or in any way assist any other person to effect or
     seek, offer or propose (whether publicly or otherwise) to effect or
     participate in, (i) any acquisition of any securities (or beneficial
     ownership thereof) or assets of the Company or any of its subsidiaries,
     (ii) any tender or exchange offer or merger or other business combination
     involving the Company or any of its subsidiaries, (iii) any
     recapitalization, restructuring, liquidation, dissolution or other
     extraordinary transaction with respect to the Company or any of its
     subsidiaries or (iv) any "solicitation" of "proxies" (as such terms are
     used in proxy rules of the Securities and Exchange Commission) or consents
     to vote any voting securities of the Company, (b) form, join or in any way
     participate in a "group" (as such term is used in regulations under the
     Exchange Act) for the propose of acquiring, holding, voting or disposing of
     equity securities of the Company, (c) otherwise act, alone or in concert
     with others, to seek to control or influence the management, the Board of
     Directors or policies of the Company, (d) take any action which might force
     the Company to make a public announcement regarding any of the types of
     matters set forth in (a) above, or (e) enter into any discussions or
     arrangements with any third party with respect to any of the foregoing,
     except that you shall be free of any restriction or obligation imposed by
     this Paragraph 8 if one or more third parties has taken any one or more of
     the actions set forth above or has announced its intention to do so.

9.   You agree that the Company reserves the right, in its sole and absolute
     discretion, to reject any or all proposals, to decline to furnish further
     Information and to terminate discussions and negotiations with you at any
     time.  The exercise by the Company of these rights shall not affect the
     enforceability of any provision of this agreement.

10.  Without the prior written consent of the Company you agree not to directly
     or indirectly solicit for employment any of the current employees of the
     Company so long as they are employed by the Company during the period in
     which there are discussions or negotiations conducted pursuant to this
     agreement and for a period of one year after abandonment or termination of
     such discussions or negotiations.  For the purposes of this paragraph, a
     solicitation will not include general employment solicitations, including
     newspaper advertisements and industry publications, or employees of the
     Company who approach you.

11.  This agreement will be governed and construed in accordance with the laws
     of the State of Florida as applied to agreements to be performed entirely
     within the State of Florida.  No amendment, modification or discharge of
     this agreement, and no waiver hereunder, shall be valid or binding unless
     set forth in writing and duly executed by the party against whom

<PAGE>

Pfizer Inc.
August 16, 1995
Page 5


     enforcement of the amendment, modification, discharge or waiver is sought.
     No delay or failure at any time on the part of any party in exercising any
     right, power or privilege under this agreement, or in enforcing any
     provision of this agreement, shall impair any such right, power or
     privilege, or be construed as a waiver of such provision, or be construed
     as a waiver of any default or any acquiescence therein, or shall effect the
     right of any party thereafter to enforce each and every provision of this
     agreement in accordance with its terms.  This agreement shall be binding
     upon and shall inure to the benefit of the parties hereto and their
     respective successors and assigns.

12.  All obligations of the Parties under this Agreement (other than obligations
     arising from breaches of this Agreement occurring prior to the end of such
     three year period) shall terminate three years from the date of this
     Agreement.

If you agree with the foregoing, please so indicate by signing and returning
one executed copy of this letter, which will constitute our agreement with
respect to the subject matter of this letter.

Very truly yours,

DILLON, READ & CO. INC. on behalf of
CORVITA CORPORATION

BY: /s/ Tamara A. Baum
   -------------------
     Tamara A. Baum
     Managing Director

Confirmed and Agreed as of
the day written above:

PFIZER INC.


By: /s/ P. Nigel Gray
   -------------------
     P. Nigel Gray
     President, Hospital Products Group




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