OPHIDIAN PHARMACEUTICALS INC
SC 13D, 1999-03-10
COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D
                    Under the Securities Exchange Act of 1934

                         OPHIDIAN PHARMACEUTICALS, INC.
                                (Name of Issuer)

                          Common Stock, $.025 par value
                         (Title of Class of Securities)

                                    683725105
                                 (CUSIP Number)

                              Michael D. Rosenthal
                          SONNENSCHEIN NATH & ROSENTHAL
                                8000 Sears Tower
                             Chicago, Illinois 60606
                            Telephone: (312) 876-8000
                 (Name, Address and Telephone Number of Persons
                Authorized to Receive Notices and Communications)


                                February 10, 1999
             (Date of Event which Requires Filing of this Statement)


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


                        (Continued on following page(s))



                                Page 1 of 6 Pages
<PAGE>   2
                                  SCHEDULE 13D

CUSIP NO.  683725105                                           PAGE 2 OF 5 PAGES
         
- --------------------------------------------------------------------------------
1   NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

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


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

    PF
- --------------------------------------------------------------------------------
5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
    TO ITEMS 2(d) OR 2(e)                                                    [ ]

- --------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION


    United States
- --------------------------------------------------------------------------------
                7   SOLE VOTING POWER
  NUMBER OF
                    80,532
   SHARES      -----------------------------------------------------------------
                8   SHARED VOTING POWER
BENEFICIALLY
                    500,000
OWNED BY EACH  -----------------------------------------------------------------
                9   SOLE DISPOSITIVE POWER
  REPORTING
                    80,532
   PERSON      -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER
    WITH 
                    500,000
- --------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     580,532
- --------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES 
     CERTAIN SHARES*                                                         [X]

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

     6.26%
- --------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

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



                              Page 2 of 6 Pages
<PAGE>   3
Item 1.  Security and Issuer

         This Schedule 13-D relates to the class of common stock, $.025 par
value (the "Common Stock"), of Ophidian Pharmaceuticals, Inc. a Wisconsin
corporation (the "Issuer"), with its principal offices located at 5445 East
Cheryl Parkway, Madison, Wisconsin 53711.

Item 2.  Identity and Background

         Dr. Model's principal business address is 1230 York Avenue, New York,
New York 10021. Dr. Model is co-trustee (with Allen Model) and a beneficiary of
the Peter Model Trust #2 ("Trust #2"). Dr. Model is also co-trustee (with Peter
Goldman) of Model Charitable Lead Trust (the "Lead Trust"). Dr. Model's
principal occupation is as a scientist and as a professor at Rockefeller
University.

         Dr. Model has not, during the last five years, been convicted in a
criminal proceeding (excluding traffic violations or similar misdemeanors). In
addition, Dr. Model has not, during the past five years, been 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 or mandating activities
subject to, federal or state securities laws or finding any violation with
respect to such laws.

         Dr. Model is a citizen of the United States of America.

Item 3.  Source and Amount of Funds or Other Consideration

         On February 10, 1999:

         (i) Model acquired 75,000 shares of Common Stock;

         (ii) Trust #2 acquired 75,000 shares of Common Stock; and

         (iii) the Lead Trust acquired 150,000 shares of Common Stock.

All of these shares were purchased from Sean B. Carroll, a founder of the
Company, for a purchase price of $1.75 per share.

         Dr. Model used personal funds to acquire the shares acquired by him.
Trust #2 and the Lead Trust used cash in the respective trusts to acquire the
shares respectively acquired by them.

Item 4.  Purpose of Transaction

         The securities listed in Item 5 are held for investment purposes.
Subject to availability and price, and subject to applicable laws and
regulations, Dr. Model (and/or the Trust #2 or the

         
                                Page 3 of 6 Pages

<PAGE>   4



Lead Trust) may acquire additional shares of Common Stock or dispose of shares
of Common Stock owned by such Reporting Person at any time or from time to time.
The acquisition described in Item 3 was accomplished, in part, in order to
reduce Dr. Carroll's ownership in the Company. This allowed Dr. Carroll to
comply with certain limitations on Dr. Carroll's imposed by his employer, and is
designed to facilitate his closer involvement in the Company's scientific
affairs.

         Except as set forth in this Item 4, the Dr. Model has no other present
plans or proposals that relate to or that could result in any of the actions
specified in clauses (a) through (j) of Item 4 of Schedule 13D.

Item 5.  Interest in Securities of the Issuer

         (a) Dr. Model beneficially owns 580,532 shares of Common Stock,
consisting of (i) 75,182 shares owned by him directly, (ii) 5,350 issuable upon
the exercise of currently vested options granted to Dr. Model pursuant to the
Company's 1992 Stock Option Plan (the "Options"), (iii) 134,000 shares owned by
Trust #2, (iv) 15,000 shares issuable upon the exercise of warrants owned by
Trust #2, (v) 321,000 shares owned by the Lead Trust and (vi) 30,000 shares
issuable upon the exercise of warrants owned by the Lead Trust. Dr. Model has
beneficial ownership of 6.26% of the outstanding shares of Common Stock. This
amount is based upon 9,223,018 shares of Common Stock being outstanding (as
reported by the Company in its Proxy Statement on Schedule 14A dated February
23, 1999) and, as required pursuant to Rule 13d-3, treats all warrants and
options beneficially owned by Dr. Model which are exercisable within sixty days
of the date hereof (but no other options or warrants) as having been exercised
on the date hereof.

         (b) Dr. Model shares dispositive and voting power over all securities
owned by Trust #2 and the Lead Trust. He has sole voting and dispositive power
over all securities owned directly by him.

         (c) Except as noted in Item 3, above, Dr. Model has not acquired
beneficial ownership of any additional shares of Common Stock during the past 60
days.

Item 6.  Contracts, Arrangements, Understandings or Relationships With Respect 
         to Securities of the Issuer

         Dr. Model serves as a director of the Company.

         Attached as Exhibit A hereto is the form of purchase agreement,
including exhibits thereto, which were executed in connection with the
transactions described in Item 3, above.

         The Options entitle Dr. Model to purchase 5,350 shares of Common Stock
at an exercise price of $5.50 per share. The Options expire in July 2007. The
warrants (the "Warrants") held by Trust #2 and the Lead Trust entitle them to
purchase shares at a price of $7.32 per share




                               Page 4 of 6 Pages



<PAGE>   5



(subject to adjustment) and expire on May 7, 2003. Commencing May 7, 2000, the
Warrants are subject to redemption by the Company, in whole but not in part, at
a price of $.10 per Warrant on 30 days prior written notice provided that the
average closing bid price of the Common Stock on the Nasdaq Small Cap Market
equals or exceeds $14.64 per share for any 20 trading days within a period of 30
consecutive trading days ending on the fifth trading day prior to the date of
the notice of redemption. The form of Warrant Certificate and the form of
Warrant Agreement pursuant to which the Warrants were issued are included as
Exhibits B and C hereto, respectively, and are incorporated by reference from
the Company's Registration Statement on Form S-1, as amended, effective May 7,
1998, Registration No. 333-33219 (the "Registration Statement").

         Other than as described herein, Dr. Model does not have any other
contract, arrangement or understanding with respect to the Common Stock.

Item 7.  Material to be Filed as Exhibits


Exhibit Number                                 Exhibit

         A.                Form of Stock Purchase Agreement.
         B.                Form of Warrant Certificate, filed as Exhibit 4.2 to
                           the Registration Statement, and incorporated herein
                           by reference in its entirety.
         C.                Form of Warrant Agreement, filed as Exhibit 4.4 to
                           the Registration Statement, and incorporated herein
                           by reference in its entirety.


                                Page 5 of 6 Pages

<PAGE>   6


                                    SIGNATURE


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



Dated:   February 24, 1999
                                                    /s/PETER MODEL
                                                    ---------------------------
                                                    PETER MODEL





                                Page 6 of 6 Pages


<PAGE>   1
                                                                    EXHIBIT 99.A


                               PURCHASE AGREEMENT



         THIS PURCHASE AGREEMENT (the "Agreement") dated as of February __, 1999
by and between ________________ ("Buyer") and Sean B. Carroll, an individual
residing in the State of Wisconsin ("Seller").


                                R E C I T A L S:

         A. Seller owns of record and beneficially __ shares (the "Shares") of
the Common Stock, par value $.0025 per share ("Common Stock") of Ophidian
Pharmaceuticals, Inc., a Wisconsin corporation ("Ophidian").

         B. Seller desires to sell the Shares to Buyer and Buyer desires to buy
the Shares from Seller, all upon the terms and subject to the conditions set
forth herein.

         C. In consideration of the recitals (which are deemed to be a part of
this Agreement) and of the respective representations, warranties, covenants,
agreements and conditions contained herein, Buyer and Seller hereby agree as
follows:

                               A G R E E M E N T S

1.       Purchase and Sale of Shares; Closing.

         1.1. Purchase and Sale. Upon the terms and subject to the conditions
set forth in this Agreement, Seller agrees to sell all of Seller's right, title
and interest in and to the Shares to Buyer and Buyer hereby agrees to purchase
the Shares from Seller. The purchase price for the Shares shall be $1.75 per
share resulting in the aggregate purchase price of $_________ (the aggregate
purchase price being referred to herein as the "Purchase Price").

         1.2. Closing. The closing (the "Closing") of the purchase and sale of
the Shares hereunder shall occur by the following method unless otherwise agreed
to by the parties in writing. Within 24 hours of Buyer's receipt of confirmation
from Ophidian's Transfer Agent, Continental Stock Transfer & Trust Company, New
York, New York (which in no event shall be provided prior to the satisfaction of
the conditions set forth in Section 4.1 hereof) that the Transfer Agent has
received (a) certificates representing the Shares, duly endorsed by Seller in
blank or accompanied by appropriate stock powers endorsed, and (b) written
instruction from Ophidians legal counsel directing the Transfer Agent to
transfer the Shares from Seller to Buyer, Buyer shall pay the Purchase Price in
full to Seller by wire transfer to the account specified by Seller in Exhibit A
hereto. For purposes of this Agreement, the "Closing Date" shall be the date on
which Seller receives the Purchase Price in the account identified on Exhibit A
hereto.




<PAGE>   2



         1.3      Certain Definitions. For purposes of this Agreement, the term:

                  (a) "Lien" shall mean all title defects, charges, claims,
         restrictions, liens, pledges, security interests, mortgages,
         conditional sale or other title retention agreements, assessments,
         covenants, restrictions, rights of first refusal, and other burdens,
         options, restrictions or encumbrances of any kind but shall not include
         the restriction against resale of any securities except in compliance
         with the registration requirements pursuant to the Securities Act of
         1933, as amended (the "Securities Act"), and any applicable state
         securities laws or pursuant to applicable exemptions thereto; and

                  (b) "Person" shall mean an individual, corporation, limited
         liability company, partnership, joint venture, association, trust,
         unincorporated organization or, as applicable, any other entity.

2.       Seller's Representations, Warranties and Covenants.

         Seller represents and warrants to Buyer that:

         2.1. Authority of Seller. Seller has all necessary right, capacity,
power and authority to enter into, execute and deliver this Agreement and
perform its obligations hereunder and the execution, delivery and performance of
this Agreement by Seller does not and will not (i) conflict with or result in
(including following notice, lapse of time or both) a breach, violation or
default of (x) any law, statute, rule or regulation to which Seller or the
Shares is subject (other than generally applicable federal and state securities
laws) or (y) any agreement, instrument, order, judgment or decree by which
Seller or the Shares is bound or subject, (ii) require the consent, waiver,
authorization or approval of any governmental or regulatory authority or of any
other Person which has not been previously obtained or (iii) result in the
creation of any Lien with respect to the Shares.

         2.2 Restricted Shares. The Shares to be purchased by Buyer are
restricted shares acquired by Seller in one or more private transactions not
involving a public offering. The Shares will continue to be restricted shares
following the closing of this transaction and Buyer will be prohibited from
reselling the Shares other than in compliance with the registration requirements
of the Securities Act and any applicable state securities laws or an applicable
exemption therefrom. Under Rule 144, Buyer may not use, employ or claim Seller's
holding period for the Shares in attempting to comply with Rule 144, in other
words, the Buyer's holding periods required under Rule 144 for the Shares will
commence on the Closing Date.

         2.3      Binding Effect.  This Agreement constitutes a valid and 
binding obligation of the Seller, enforceable in accordance with its terms.


                                       -2-



<PAGE>   3



         2.4 Ownership of Shares. All of the Shares are beneficially owned by
Seller, free and clear of all Liens and no Person has any option or other right
to acquire all or any of the Shares or any right, title or interest in or with
respect to the Shares from Seller. Upon delivery of the certificates
representing the Shares pursuant to this Agreement, the Buyer will acquire good,
valid and marketable title to the Shares, free and clear of all Liens other than
the Lock-up (as defined in Section 4.2(d) below).

         2.5 Sale Decision. Seller is making and has made its decision to sell
the Shares pursuant to this Agreement based upon his own investigation and
judgment with respect to the value of the Shares. Seller is one of the principal
stockholders of Ophidian and is fully acquainted with, and has had an
opportunity to ask questions and receive answers from Ophidian, regarding its
financial position, business and prospects, and he has received all the
information he considers necessary or appropriate for deciding whether to sell
the Shares. Seller has not relied upon, and hereby disclaims, any representation
or warranty made by Buyer, except as explicitly set forth herein.

         2.6 Accredited Investor. Seller is an "accredited investor" within the
meaning of Rule 501 of Regulation D under the Act of 1933, as presently in
effect. Seller has such knowledge and experience in financial and business
matters that he is capable of evaluating the merits and risks of the proposed
disposition of the Shares.

         2.7 Public Documents. Seller represents that he has been provided and
has reviewed a copy of Ophidian's annual report on SEC Form 10-K (the "10-K")
for the fiscal year ended September 30, 1998. To the actual present knowledge of
Seller, the 10-K, as of the date hereof, does not contain any untrue statement
of material fact or omit to state any material fact required to be stated
therein or necessary in order to make the statements therein not misleading, and
there has not been any event which has occurred since the date of the 10-K which
is reasonably likely to have a material adverse effect on Ophidian's business,
properties, operations, condition (financial or otherwise) or prospects.

         2.8 No Broker or Finder. Seller has engaged no broker or finder in
connection with this Agreement or the transactions contemplated hereby.

3.       Buyer's Representations, Warranties and Covenants.

         Buyer represents and warrants to Seller that:

         3.1. Authority of Buyer. To the extent that the Buyer is a trust, the
execution, delivery and performance by Buyer of this Agreement have been duly
authorized by Buyer. Buyer has all necessary right, power, capacity and
authority to enter into, execute and deliver this Agreement and perform its
obligations hereunder and the execution, delivery and performance of this
Agreement does not and will not (i) conflict with or result in (including
following notice, lapse of time or both) a breach, violation or default of (x)
in the case of a Buyer which is a trust, Buyer's trust agreement, (y) any law,
statute, rule or regulation to

                                       -3-



<PAGE>   4



which Buyer is subject or (z) any agreement, instrument, order, judgment or
decree by which Buyer is bound or subject or (ii) require the consent, waiver,
authorization or approval of any governmental authority or of any other Person.

         3.2 Restricted Shares. Buyer acknowledges that the Shares are subject
to certain restrictions and that Buyer will be prohibited from reselling the
Shares other than in compliance the registration requirements under the
Securities Act and any applicable state Securities laws or an applicable
exemption therefrom. Under Rule 144, Buyer may not use, employ or claim Seller's
holding period for the Shares in attempting to comply with Rule 144, in other
words, the required holding periods under Rule 144 for the Shares will commence
on the closing Date. Buyer further acknowledges that the certificates
representing the Shares transferred by Seller to Buyer will bear legends
confirming the restrictions on the re-sale of the Shares.

         3.3 Binding Effect. This Agreement constitutes a valid and binding
obligation of the Buyer, enforceable in accordance with its terms.

         3.4 Sale Decision. Buyer is making and has made a decision to purchase
the Shares pursuant to this Agreement based upon his or its own investigation
and judgment with respect to the value of the Shares. Buyer is, or in the case
of a trust has a trustee who is, a principal stockholder and/or director of
Ophidian. Buyer, or its trustee, is fully acquainted with, and has had an
opportunity to ask questions and receive answers from Ophidian, regarding
Ophidian's financial position, business and prospects. Buyer has received all
the information it considers necessary or appropriate for deciding whether to
purchase the Shares. Buyer has not relied upon, and hereby disclaims, any
representation or warranty made by Seller, except as explicitly set forth
herein.

         3.5 Accredited Investor Status; Investment Intent. Buyer is an
"accredited investor" within the meaning of Rule 501 of Regulation D under the
Act of 1933, as presently in effect. If Buyer is an individual, his net worth
along with the net worth of his spouse exceeds $1 million or his individual
income has exceeded $200,000 (or $300,000 with his spouse) for each of the past
two years and he expects to have income in excess of such levels for the current
year. If Buyer is a trust, its assets exceed $5,000,000, it was not formed for
the purpose of investing in Ophidian and its trustee is a sophisticated person.
Buyer has such knowledge and experience in financial and business matters that
he or it is capable of evaluating the merits and risks of the proposed
disposition of the Shares. Buyer is purchasing the Shares for investment
purposes, and not with a view to the resale or distribution of any part of the
Shares. The Buyer does not have any contract, undertaking, agreement or
arrangement with any Person to sell, transfer or grant participations to any
third person, with respect to the Shares.

         3.6 Public Documents. Buyer represents that he or it has been provided
and has reviewed a copy of the 10-K for the fiscal year ended September 30,
1998. To the actual present knowledge of Buyer, the 10-K, as of the date hereof,
does not contain any untrue

                                       -4-



<PAGE>   5



statement of material fact or omit to state any material fact required to be
stated therein or necessary in order to make the statements therein not
misleading, and there has not been any event which has occurred since the date
of the 10-K which is reasonably likely to have a material adverse effect on
Ophidian's business, properties, operations, condition (financial or otherwise)
or prospects.

         3.7 No Broker or Finder. Buyer has engaged no broker or finder in
connection with this Agreement or the transactions contemplated hereby.

4.       Conditions to Closing.

         4.1 Conditions to Obligations of Buyer. The obligations of Buyer
hereunder are subject to the satisfaction at or prior to the Closing of the
following conditions, unless waived by the Buyer:

                  (a) Performance. Each of the covenants and obligations of
         Seller to be performed at or prior to the Closing shall have been duly
         performed;

                  (b) Representations and Warranties. Each representation and
         warranty of Seller shall be true and correct as of the Closing, as if
         such representation and warranty had been made at such time, and Buyer
         shall have received a certificate to that effect in a form attached
         hereto as Exhibit B.

                  (c) No Litigation. There shall be no injunction or court order
         restraining consummation of the transactions contemplated hereby or any
         part thereof, and there shall be no pending or threatened action or
         proceeding by or before a court or governmental body seeking to
         restrain or invalidate all or any portion of any of such transaction,
         or seeking damages or other relief against Buyer or any of his or its
         affiliates upon the consummation of all or any portion of such
         transaction, and there shall not have been adopted any law or
         regulation making all or any portion of such transaction illegal.

         4.2 Conditions to Obligations of Seller. The obligations of Seller
hereunder are subject to the satisfaction at or prior to the Closing of the
following conditions, unless waived by the Seller:

                  (a) Performance. Each of the covenants and obligations of
         Buyer to be performed at or prior to the Closing shall have been duly
         performed;

                  (b) Representations and Warranties. Each representation and
         warranty of Buyer shall be true and correct as of the Closing, as if
         such representation and warranty had been made at such time and Seller
         shall have received a certificate to that effect in the form attached
         hereto as Exhibit C.


                                       -5-



<PAGE>   6



                  (c) No Litigation. There shall no injunction or court order
         restraining consummation of the transactions contemplated hereby or any
         part thereof, and there shall be no pending or threatened action or
         proceeding by or before a court or governmental body seeking to
         restrain or invalidate all or any portion of any of such transaction,
         or seeking damages or other relief against Seller or any of his
         affiliates upon the consummation of all or any portion of such
         transaction, and there shall not have been adopted any law or
         regulation making all or any portion of such transaction illegal.

                  (d) Lock-up Letter. To the extent that the Closing hereunder
         shall have occurred prior to February 7, 1999, Seller shall have
         delivered a Lock-up Agreement (the "Lock-up"), in substantially the
         form attached hereto as Exhibit D, to Dirks & Company, Inc. and
         Security Capital Trading, Inc., as representatives of the several
         underwriters in connection with Ophidian's offering of Units consisting
         of shares of Common Stock and warrants to purchase Common Stock
         pursuant to that certain prospectus dated May 7, 1998.

5.       Survival.  The representations, warranties and covenants herein or in 
any certificate or other writing delivered pursuant hereto or in connection
herewith shall survive the Closing.

6.       Notices. Any notice or other communication under or pursuant to his 
Agreement shall be in writing and may be given by any of the following methods:
(a) personal delivery; (b) telecopy transmission; (c) registered or certified
mail, postage prepaid, return receipt requested; or (d) recognized overnight
delivery service. Notice shall be to the appropriate party at the address or
telecopier number listed on the signature page hereto (or in either case to the
address or telecopier number as shall be specified by notice given under this
Agreement).

7.       Miscellaneous.

         7.1 Successors and Assigns. This Agreement shall be binding upon and
shall inure to the benefit of the parties and their respective successors and
assigns, provided, however, that neither this Agreement, nor any right
hereunder, may be assigned by any party without the consent of the other party
hereto.

         7.2 Entire Agreement; Amendment. This Agreement, including the recitals
hereto, and the other instruments referred to herein embody the entire agreement
of the parties hereto with respect to the subject matter hereof and supersede
all prior agreements with respect thereto. This Agreement may be amended, and
any provision hereof waived, but only in a writing signed by the party against
whom such amendment or waiver is sought to be enforced.


                                       -6-



<PAGE>   7



         7.3 Counterparts. This Agreement may be executed in two or more
counterparts, all of which taken together shall constitute one and the same
instrument.

         7.4 Further Assurances. Buyer and Seller each agree to execute and
deliver such other documents, certificates, agreements and other writings and to
such other actions as may be reasonably requested by the other party in order to
consummate or implement expeditiously the transactions contemplated by this
Agreement.

         7.5 Severability. Any term or provision of this Agreement which is
invalid or unenforceable in any jurisdiction shall, as to such jurisdiction, be
ineffective to the extent of such invalidity or enforceability without rendering
invalid or unenforceable the remaining terms and provisions of this Agreement,
or affecting the validity or enforceability of any of the terms or provisions of
this Agreement in any other jurisdiction.

         7.6 Captions. The captions herein are inserted for convenience of
reference only and shall be ignored in the construction or interpretation
hereof.

         7.7 Governing Law. This Agreement shall be governed by and construed
under the laws of the State of Illinois without giving effect to principles of
conflict of laws.

         7.8 Termination. This Agreement may be terminated and the transactions
contemplated hereby may be abandoned at any time prior to the Closing:

                  (a) By the mutual written consent of Buyer and Seller;

                  (b) By Buyer, by written notice to Seller on any date after
         March 1, 1999 if the Closing has not taken place by such date;

                  (c) By Seller, by written notice to Buyer on any date after
         March 1, 1999 if the Closing has not taken place by such date; or

                  (d) By Buyer, by written notice to Seller, at any time after a
         proceeding under any bankruptcy, reorganization, arrangement of debt,
         insolvency, readjustment of debt or receivership law is filed against
         Ophidian.

Upon any such termination, the transactions contemplated hereby shall be
abandoned without further action by any party, and neither party to this
Agreement shall have any right or claim against the other on account of such
termination unless this Agreement is terminated by a party on account of the
breach of any representation, warranty, term or covenant herein by the other
party, in which case the terminating party shall be entitled to all of its
rights and remedies at law or in equity.


                                       -7-



<PAGE>   8




         IN WITNESS WHEREOF, this Agreement has been executed by each of the
parties hereto as of the day and ate first above written.


                                     SELLER:


                                                     ---------------------------
                                                     Sean B. Carroll
                                                     1525 Linden Drive
                                                     Madison, Wisconsin  53706
                                                     Telecopier:  608/262-9343


                                     BUYER:





                                       -8-



<PAGE>   9



                                    EXHIBIT A


Wire Transfer Instructions


                  Account Number:



                                       -1-



<PAGE>   10



                                    EXHIBIT B

                          FORM OF SELLER'S CERTIFICATE


         The undersigned hereby certifies that my representations and warranties
contained in the Purchase Agreement dated as of February , 1999, between me and
are true and correct on and as of the date hereof.

         This Certificate is being furnished to the Buyer with the understanding
that it will be relied upon by the Buyer, as well as by Ophidian and the law
firm of LaFollette Sinykin, LLP, as counsel to Ophidian, in conjunction with its
rendering of a legal opinion to Ophidian regarding the transfer.

         IN WITNESS WHEREOF, the undersigned has executed this certificate this
day of , 1999.


                                                    ----------------------------
                                                    Sean B. Carroll

                                                    

                                       -2-



<PAGE>   11



                                    EXHIBIT C

                           FORM OF BUYER'S CERTIFICATE


         The undersigned hereby certifies that the undersigned's representations
and warranties contained in the Purchase Agreement dated as of February _____,
1999, between the undersigned and Sean B. Carroll are true and correct on and
as of the date hereof.

         This Certificate is being furnished to the Seller with the
understanding that it will be relied upon by the Seller, as well as by Ophidian
and the law firm of LaFollette Sinykin, LLP, as counsel to Ophidian, in
conjunction with its rendering of a legal opinion to Ophidian regarding the
transfer.


         The undersigned hereby further certifies that he or it has received or
has had access to all information necessary for the purchase of the Shares
referred to in the Purchase Agreement, he or it has been fully advised regarding
the restrictive status of the stock,and the undersigned is purchasing the Shares
for investment purposes only and with no intent of re-sale.

         IN WITNESS WHEREOF, the undersigned has executed this certificate this
day of _____, 1999.



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


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<PAGE>   12


                                   EXHIBIT D


DIRKS & COMPANY, INC.
SECURITY CAPITAL TRADING, INC.,
As Representatives of the several Underwriters
520 Madison Avenue
New York, New York  10022

Ladies and Gentlemen:

         In order to induce Dirks & Company, Inc. and Security Capital Trading,
Inc., the representatives of the several underwriters (the "Representatives") to
consent to the transfer of ___ shares (the "Shares") of the Common Stock, par
value $.0025 per share ("Common Stock") of Ophidian Pharmaceuticals, Inc., a
Wisconsin corporation ("Ophidian") by Sean B. Carroll ("Carroll"),
notwithstanding the terms of that certain letter agreement executed by Carroll
in favor of the Representatives, dated as [May 7, 1998], the undersigned hereby
agrees that from the date hereof until February 7, 1999, the undersigned will
not, without the prior written consent of the Representatives, sell, contract or
offer to sell, issue, transfer, assign, pledge, distribute or otherwise dispose
of, directly or indirectly, the Shares.

         In order to enable the aforesaid covenants to be enforced, the
undersigned hereby consents to the placing of legends and/or stop-transfer
orders with the transfer agent of Ophidian's securities with respect to the
Shares.

         This Agreement shall be governed by and construed and enforced in
accordance with the laws of the State of New York without giving effect to the
choice of law or conflicts of law principles.

Dated:  February __, 1999


- --------------------------------                         -----------------------
Address                                                  Signature


- --------------------------------                         -----------------------
Social Security Number or                                Name
Taxpayer I.D. Number


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