RALSTON PURINA CO
8-K, 1997-07-28
GRAIN MILL PRODUCTS
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

                                   FORM 8-K

                                CURRENT REPORT

                      Pursuant to Section 13 or 15(d) of

                      THE SECURITIES EXCHANGE ACT OF 1934

                         Date of Report: July 28, 1997

                            RALSTON PURINA COMPANY

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

            (Exact name of Registrant as specified in its charter)

        MISSOURI                  1-4582             No. 43-0470580
     --------------------------------------------------------------------
   (State or Other             (Commission           (IRS Employer
    Jurisdiction of             File Number)          Identification
    Incorporation)                                       Number)

              CHECKERBOARD SQUARE, ST. LOUIS, MISSOURI    63164
              ---------------------------------------------------
         (Address of Principal Executive Offices       (Zip Code)

                                (314) 982-1000
                                ---------------

             (Registrant's telephone number, including area code)
<PAGE>
 
Item 5. Other Events:

        Under the terms and subject to the conditions contained in an 
Underwriting Agreement dated July 23, 1997, (the "Underwriting Agreement") by 
and among the Registrant and Credit Suisse First Boston Corporation, Bear, 
Stearns & Co. Inc. Morgan Securities Inc., Lehman Brothers Inc. and Salomon 
Brothers Inc, as representatives of the several underwriters named therein 
(the "Underwriter"), the Underwriters  have agreed to purchase from the 
Registrant an aggregate of $419,998,187.50 of the Registrant's 7.0% Exchangeable
Notes Due 2000 ("SAILS"), exchangeable at maturity for shares of the common
stock of Interstate Bakeries Corporation. The SAILS are to be issued under an
indenture, dated as of May 26, 1995 as supplemented by a supplemental indenture
dated as of July 29, 1997, (the "Supplemental Indenture"), between the
Registrant and The First National Bank of Chicago, as trustee. Copies of the
Underwriting Agreement and the Supplemental Indenture are filed herewith.

Item 7. Financial Statements and Exhibits

(c)  Exhibits

(1)  Underwriting Agreement dated July 23, 1997, between the Registrant, Credit
     Suisse First Boston Corporation, Bear, Stearns, & Co. Inc., J.P. Morgan
     Securities Inc, Lehman Brothers Inc., Salomon Brothers, Inc, as
     representatives of the several underwriters named therein, relating to the
     issuance and sale of $419,998,187.50 in aggregate principal amount of the
     Registrant's 7.0% Exchangeable Notes due August 1, 2000.

4(b) First Supplemental Indenture dated as of July 29, 1997, between the
     Registrant and The First National Bank of Chicago, Trustee.


SIGNATURES:

        Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the 
undersigned hereunto duly authorized.


                                              

                                                RALSTON PURINA COMPANY


                                             By: /s/ James R. Elsesser
                                                -------------------------
                                                  James R. Elsesser
                                                  Vice President and
                                                  Chief Financial Officer


Dated: July 28, 1997

<PAGE>
 
                                                                       EXHIBIT 1


                            RALSTON PURINA COMPANY

                                $419,998,187.50
          6,781,000 STOCK APPRECIATION INCOME LINKED SECURITIES (SM)

                        7% EXCHANGEABLE NOTES DUE 2000
               (SUBJECT TO EXCHANGE INTO SHARES OF COMMON STOCK,
         PAR VALUE $.01 PER SHARE, OF INTERSTATE BAKERIES CORPORATION)

                            UNDERWRITING AGREEMENT


                                                                   July 23, 1997

CREDIT SUISSE FIRST BOSTON CORPORATION
BEAR, STEARNS & CO. INC.
LEHMAN BROTHERS INC.
J.P. MORGAN SECURITIES INC.
SALOMON BROTHERS INC
  As Representatives of the Several Underwriters,
  c/o Credit Suisse First Boston Corporation
  Eleven Madison Avenue
  New York, NY 10010-3629

Ladies and Gentlemen:

          1.  Introductory.  Ralston Purina Company, a Missouri corporation (the
              ------------                                                      
"Company"), proposes to issue and sell to you (the "Underwriters"), an aggregate
amount of 6,781,000 SAILS (Stock Appreciation Income Linked Securities)
consisting of its 7% Exchangeable Notes Due 2000, which are registered under the
registration statement referred to in Section 3(a) (referred to herein as the
"SAILS"), in such amounts to each of the Underwriters as set forth in Schedule A
hereto.  The SAILS will be issued under an Indenture, dated as of May 26, 1995,
between the Company and The First National Bank of Chicago, as trustee
("Trustee"), as supplemented by a First Supplemental Indenture, dated as of July
29, 1997, between the Company and the Trustee (as supplemented from time to
time, the "Indenture").  In addition, the Underwriters will have the option to
purchase from the Company up to an additional 968,000 SAILS (the "Option
SAILS").  The Firm SAILS and the Option SAILS, if purchased, are hereinafter
collectively referred to as the "SAILS."

          In connection with the foregoing Interstate Bakeries Corporation, a
Delaware corporation ("IBC"), has filed with the Securities and Exchange
Commission (the "Commission") a Form S-3 registration statement with respect to
6,781,000 shares (the "IBC Firm Shares") of common stock of IBC, par value $.01
per share ("IBC Common Stock"), plus an additional 968,000 shares of IBC Common
Stock (the "IBC Option Shares") to the extent the Underwriters exercise their
over-allotment option with respect to the SAILS, for sale by the Company as a
selling stockholder (to the extent it shall so elect to deliver IBC Common Stock
to holders of the SAILS at maturity thereof pursuant to the terms of
<PAGE>
 
                                                                               2



the SAILS), which registration statement is referred to in Section 2(a).  The
IBC Firm Shares and the IBC Option Shares, if the Options SAILS are purchased,
are hereinafter collectively referred to as the "IBC Shares."

          2.  Representations and Warranties of IBC.  IBC represents and
              -------------------------------------                     
warrants to, and agrees with, the Underwriters and the Company that:

          (a) IBC meets the requirements for the use of a Form S-3 under the
     Securities Act of 1933, as amended (the "Act").  A registration statement
     on Form S-3 (File No. 333-27961), including a preliminary form of
     prospectus, relating to the IBC Shares has been filed with the Commission
     and either (i) has been declared effective under the Act, and is not
     proposed to be amended or (ii) is proposed to be amended by amendment or
     post-effective amendment.  If such registration statement (the "initial IBC
     registration statement") has been declared effective, either (A) an
     additional registration statement (the "additional IBC registration
     statement") relating to the IBC Shares may have been filed with the
     Commission pursuant to Rule 462(b) ("Rule 462(b)") under the Act and, if so
     filed, has become effective upon filing pursuant to such Rule and the IBC
     Shares all have been duly registered under the Act pursuant to the initial
     IBC registration statement and, if applicable, the additional IBC
     registration statement or (B) such an additional IBC registration statement
     is proposed to be filed with the Commission pursuant to Rule 462(b) and
     will become effective upon filing pursuant to such Rule and upon such
     filing the IBC Shares will all have been duly registered under the Act
     pursuant to the initial IBC registration statement and such additional IBC
     registration statement.  If IBC does not propose to amend such registration
     statement or if an additional IBC registration statement has been filed and
     IBC does not intend to amend it and if any post-effective amendment to
     either such registration statement has been filed with the Commission prior
     to the execution and delivery of this Underwriting Agreement ("Agreement"),
     the most recent such amendment has been declared effective by the
     Commission or has been declared effective by the Commission or has become
     effective upon filing pursuant to Rule 462(c) ("Rule 462(c)") under the Act
     or in the case of the additional IBC registration statement, Rule 462(b).
     For purposes of this Agreement, "IBC Effective Time" means with respect to
     the initial IBC registration statement or, if filed prior to the execution
     and delivery of this Agreement, the additional IBC registration statement
     (i) if IBC has advised the Underwriters that it does not propose to amend
     such registration statement, the
<PAGE>
 
                                                                               3

     date and time as of which such registration statement or the most recent
     post-effective amendment thereto (if any) filed prior to the execution and
     delivery of this Agreement, was declared effective by the Commission or has
     become effective pursuant to Rule 462(c), or (ii) if IBC has advised the
     Underwriters that it proposes to file an amendment or post-effective
     amendment to such registration statement, the date and time as of which
     such registration statement, as amended by such amendment or post-effective
     amendment, as the case may be, is declared effective by Commission or has
     become effective pursuant to Rule 462(c).  If an additional IBC
     registration statement has not been filed prior to the execution and
     delivery of this Agreement but the IBC has advised the Underwriters that it
     proposes to file one, "IBC Effective Time" with respect to such additional
     IBC registration statement means the date and time as of which such
     registration statement is filed and becomes effective pursuant to Rule
     462(b).  "IBC Effective Date" means the date of the IBC Effective Time.
     The initial IBC registration statement, as amended at its IBC Effective
     Time and all material incorporated by reference therein, including all
     information contained in the additional IBC registration statement (if any)
     and deemed to be a part of the initial IBC registration statement as of the
     IBC Effective Time of the additional IBC registration statement pursuant to
     the General Instructions of Form S-3 on which it is filed and including all
     information (if any) deemed to be a part of the initial IBC registration
     statement as of its IBC Effective Time pursuant to Rule 430A(b) ("Rule
     430A(b)") under the Act, is hereinafter referred to as the "Initial IBC
     Registration Statement".  The additional IBC registration statement (if
     any), as amended at its IBC Effective Time, including the contents of the
     initial IBC registration statement incorporated by reference therein and
     including all information (if any) deemed to be a part of the additional
     IBC registration statement as of its IBC Effective Time pursuant to Rule
     430A(b), is hereinafter referred to as the "Additional IBC Registration
     Statement".  The IBC Initial Registration Statement and the Additional IBC
     Registration Statement are hereinafter referred to collectively as the "IBC
     Registration Statements" and individually as an "IBC Registration
     Statement". The form of prospectus relating to the IBC Shares, as first
     filed with the Commission pursuant to and in accordance with Rule 424(b)
     ("Rule 424(b)") under the Act or (if no such filing is required) as
     included in an IBC Registration Statement, including all material
     incorporated by reference in such prospectus, is hereinafter referred to as
     the "IBC Prospectus". Copies of such registration statement and amendments
<PAGE>
 
                                                                               4

     and of each related preliminary prospectus ("Preliminary IBC Prospectuses")
     have been delivered to the Underwriters.

          (b) If the IBC Effective Time is prior to the execution and delivery
     of this Agreement:  (i) on the IBC Effective Date, the Initial IBC
     Registration Statement conformed in all material respects to the
     requirements of the Act and the rules and regulations of the Commission
     promulgated thereunder ("Rules and Regulations") and did not include any
     untrue statement of a material fact or omit to state any material fact
     required to be stated therein or necessary to make the statements therein
     not misleading and on the IBC Effective Date of the Additional IBC
     Registration Statement (if any), each IBC Registration Statement conformed,
     or will conform, in all respects to the requirements of the Act and the
     Rules and Regulations and did not include, or will not include, any untrue
     statement of a material fact and did not omit, or will not omit, to state
     any material fact required to be stated therein or necessary to make the
     statements herein not misleading, and (ii) on the date of this Agreement,
     the Initial IBC Registration Statement and, if the IBC Effective Time of
     the Additional IBC Registration Statement (if any) is prior to the
     execution of this Agreement, the Additional IBC Registration Statement each
     conforms, and at the time of filing of the IBC Prospectus pursuant to Rule
     424(b) and at all times subsequent thereto up to and at the First Closing
     Date (as defined below) or any Option Closing Date (as defined below), as
     the case may be, each IBC Registration Statement and the IBC Prospectus and
     any amendment or supplements thereto will conform in all material respects
     to the requirements of the Act and the Rules and Regulations, and neither
     of such documents includes, or will include any untrue statement of a
     material fact or omits, or will omit, to state any material fact required
     to be stated therein or necessary to make the statements therein not
     misleading.  If the IBC Effective Time is subsequent to the execution and
     delivery of this Agreement:  on the IBC Effective Date and at all times
     subsequent thereto up to and at the First Closing Date or any Option
     Closing Date, as the case may be, the Initial IBC Registration Statement
     and the IBC Prospectus and any amendments or supplements thereto will
     conform in all material respects to the requirements of the Act and the
     Rules and Regulations, and neither of such documents will include any
     untrue statement of a material fact or will omit to state any material fact
     required to be stated therein or necessary to make the statements therein
     not misleading. The two preceding sentences do not apply to statements in
     or omissions
<PAGE>
 
                                                                               5

     from an IBC Registration Statement or the IBC Prospectus based upon written
     information furnished to IBC by any Underwriter through Credit Suisse First
     Boston Corporation ("CSFBC") or the Company specifically for use therein,
     it being understood and agreed that the only such information is that
     described as such in Section 10.  The IBC Information (as defined herein)
     provided to the Company for use in each Company Registration Statement (as
     defined herein) and any amendments or supplements thereto, and the Company
     Prospectus (as defined herein) and any amendments or supplements thereto
     does not include, or will not include, any untrue statement of a material
     fact or omit to state any material fact required to be stated therein or
     necessary to make the statements therein not misleading. The Commission has
     not issued any order preventing or suspending the use of any Preliminary
     IBC Prospectus or the IBC Prospectus.

          (c) The documents incorporated by reference in each IBC Registration
     Statement or the IBC Prospectus, when they became effective or were filed
     with the Commission, as the case may be, under the Securities Exchange Act
     of 1934, as amended (the "Exchange Act"), conformed, and any documents so
     filed and incorporated before the First Closing Date, will, when they are
     filed with the Commission, conform, in all material respects to the
     requirements of the Act and the Exchange Act, as applicable, the Rules and
     Regulations and the rules and regulations of the Commission under the
     Exchange Act (the "Exchange Act Rules and Regulations").

          (d) IBC and Interstate Brands Corporation ("Brands") have been duly
     incorporated and are validly existing as corporations in good standing
     under the laws of their respective jurisdictions of incorporation with full
     corporate power and corporate authority to own, lease and operate their
     respective properties and conduct their respective businesses as described
     in each IBC Registration Statement, and IBC and Brands are duly qualified
     to do business as foreign corporations and are in good standing in each
     jurisdiction in which their respective ownership or lease of property or
     the conduct of their respective businesses requires such qualification,
     except where the failure to be so qualified would not have a material
     adverse effect on the condition (financial or otherwise), earnings,
     prospects or results of operations or business of IBC and Brands taken as a
     whole (an "IBC Material Adverse Effect").

          (e) The capital stock of IBC conforms in all material respects to the
     statements relating thereto
<PAGE>
 
                                                                               6

     contained in each IBC Registration Statement and the IBC Prospectus (and
     such statements correctly state the substance of the instruments defining
     the capitalization of IBC in all material respects); the IBC Shares and all
     of the issued shares of capital stock of IBC have been duly and validly
     authorized and issued, are fully paid and non-assessable and conform to the
     description thereof contained in the IBC Prospectus; the form of
     certificate used to evidence IBC Common Stock is in due and proper form and
     otherwise complies with all statutory requirements under the laws of the
     State of Delaware; except as described in or contemplated by the IBC
     Prospectus, there are no outstanding options, warrants or other rights for
     the issuance of, and there are no commitments, plans or arrangements to
     issue any shares of capital stock of IBC or any security convertible into,
     exercisable for or exchangeable for any shares of capital stock of IBC;
     and, except as described in or contemplated by the IBC Prospectus, all of
     the issued shares of capital stock of each subsidiary of IBC have been duly
     and validly authorized and issued and are fully paid, non-assessable and
     are owned directly or indirectly by IBC, free and clear of all liens,
     encumbrances, equities or claims.

          (f) Except as set forth in or incorporated by reference in the IBC
     Prospectus, there is not any pending or, to IBC's knowledge, any threatened
     action, suit, claim or proceeding by or before any court or governmental
     agency, authority or body or otherwise against IBC or any of its
     subsidiaries or any of their respective officers or any of their respective
     properties, assets or rights which would or could reasonably be expected to
     have an IBC Material Adverse Effect or prevent consummation of the
     transactions contemplated herein.

          (g) No consent, approval, authorization or order of, or filing with,
     any governmental agency or body or any court is required for the execution,
     delivery and performance of IBC of this Agreement or the consummation by
     IBC of the transactions contemplated by this Agreement, except such as may
     be required under the Act, the Rules and Regulations, the Exchange Act, the
     Exchange Act Rules and Regulations or under state or other securities or
     Blue Sky laws, rules or regulations.

          (h) IBC has full legal right, corporate power and corporate authority
     to enter into this Agreement and perform the transactions contemplated
     hereby; this Agreement has been duly authorized, executed and delivered by
     IBC and is a valid and binding agreement
<PAGE>
 
                                                                               7

     of IBC, enforceable against IBC in accordance with its terms, except as the
     indemnification and contribution provisions hereunder may be limited by
     applicable law and except as enforceability may be limited by applicable
     bankruptcy, insolvency, reorganization, moratorium, fraudulent conveyance
     or other similar laws relating to or affecting creditors' rights generally
     or by general equitable principles.

          (i) The execution, delivery and performance of this Agreement and the
     consummation of the transactions herein contemplated will not result in a
     breach or violation of any of the terms and provision of, or constitute a
     default under, (i) the charter or by-laws of IBC or any subsidiary of IBC;
     (ii) any material indenture, mortgage, deed of trust, loan agreement, bond,
     debenture, note or other evidence of indebtedness or any material lease,
     contract or other agreement or instrument to which IBC or any subsidiary of
     IBC is a party or by which it or any such subsidiary or any of their
     respective properties may be bound; or (iii) any law or any order, rule or
     regulation of any governmental agency or body or any court having
     jurisdiction over IBC or any subsidiary of IBC or over the properties of
     IBC or any such subsidiary.

          (j) Except as described in the IBC Prospectus, there are no contracts,
     agreements or understandings between IBC and any person granting such
     person any preemptive right, co-sale right, right of first refusal or right
     to require IBC to file a registration statement under the Act with respect
     to any securities of IBC owned or to be owned by such person or to require
     IBC to include such securities in the securities registered pursuant to
     each IBC Registration Statement or in any securities being registered
     pursuant to any other registration statement filed by IBC under the Act.

          (k) Deloitte & Touche LLP, who have audited the annual consolidated
     financial statements, together with the related schedules and notes, of IBC
     incorporated by reference as a part of each IBC Registration Statement,
     some of which are included in the IBC Prospectus, are independent
     accountants within the meaning of the Act and the Rules and Regulations;
     the audited consolidated financial statements of IBC, together with the
     related notes, forming part of each IBC Registration Statement and IBC
     Prospectus, fairly present in all material respects the consolidated
     financial position and the results of operations of IBC at the dates and
     for the periods to which they apply; all audited consolidated financial
     statements of IBC, together with the related schedules and notes, and all
     interim unaudited
<PAGE>
 
                                                                               8

     consolidated financial information of IBC incorporated by reference as part
     of each IBC Registration Statement have been prepared in accordance with
     generally accepted accounting principles consistently applied through the
     period involved, except as may be otherwise stated therein; the financial
     data included in each IBC Registration Statement present fairly the
     information shown therein and the historical financial information included
     in such data has been compiled on a basis substantially consistent with the
     financial statements incorporated by reference therein; and no other
     financial statements or schedules or notes are required to be included in
     each IBC Registration Statement.

          (l) Subsequent to the respective dates as of which information is
     given in each IBC Registration Statement and the IBC Prospectus, except as
     described in or contemplated by the IBC Prospectus, there has not been or
     occurred (i) any change in the business, property or assets described or
     referred to in each IBC Registration Statement or the condition (financial
     or otherwise), earnings, prospects or results of operations or business of
     IBC which could have an IBC Material Adverse Effect, (ii) any transaction
     which is material to IBC and its subsidiaries taken as a whole, except
     transactions in the ordinary course of business, (iii) any obligation,
     direct or contingent, incurred by IBC which is material to IBC and its
     subsidiaries taken as a whole, except obligations incurred in the ordinary
     course of business, (iv) any change in the capital stock or outstanding
     indebtedness of IBC which is material to IBC and its subsidiaries taken as
     a whole or (v) any issuance or granting of any right to acquire any
     securities of IBC (other than grants of stock options to directors or
     employees in the ordinary course).

          (m) Neither IBC nor any of its subsidiaries (i) is in violation of
     their respective charter or by-laws, (ii) is in default, and no event has
     occurred which, with notice or lapse of time or both, would constitute a
     breach or default, in the due performance or observance of any term,
     covenant or condition contained in any indenture, mortgage, deed of trust,
     loan agreement or other agreement or instrument to which they are parties
     or by which they are bound or to which any of their respective properties
     or assets are subject, (iii) is in violation of any law, ordinance,
     governmental rule, regulation or court decree to which it or its property
     or assets may be subject or have failed to obtain, comply with or maintain
     the effectiveness of any license, permit, certificate, franchise or other
     governmental authorization or permit necessary to the ownership of their
     respective property
<PAGE>
 
                                                                               9

     or to the conduct of their respective business except, in the case of
     clauses (ii) and (iii), for those defaults, violations or failures which,
     either individually or in the aggregate, would not or could not reasonably
     be expected to have an IBC Material Adverse Effect.

          (n) IBC is not required to be registered, and is not regulated, as an
     "investment company" as such term is defined under the Investment Company
     Act of 1940, as amended (the "1940 Act").

          (o) IBC and its subsidiaries own or possess adequate rights to use all
     material patents, patent rights, inventions, trade secrets, know-how,
     trademarks, service marks, trade names and copyrights described or referred
     to in the IBC Prospectus as owned or used by it or which are necessary for
     the conduct of its business as described in the IBC Prospectus.  IBC has
     not received any notice of infringement of or conflict with asserted rights
     of others with respect to any patents, patent rights, inventions, trade
     secrets, know-how, trademarks, service marks, trade names or copyrights
     which, singly or in the aggregate, if the subject of an unfavorable
     decision, ruling or finding, would have an IBC Material Adverse Effect.

          (p) IBC Common Stock is listed on the New York Stock Exchange
     ("NYSE"), and IBC has received no notice of any proceeding having the
     purpose or effect of discontinuing such listing.

          (q) IBC has not taken and will not take, directly or indirectly, any
     action designed to, or which might reasonably be expected to, cause or
     result in stabilization or manipulation of the price of the shares of IBC
     Common Stock to facilitate the sale or resale of the SAILS (it being
     understood that the parties hereto agree that the Repurchase Transaction
     (as defined in the IBC Prospectus) shall not for purposes of this Agreement
     be deemed to have such effect).

          (r) IBC has not distributed and will not distribute any prospectus or
     other offering materials in connection with the offering and sale of the
     SAILS other than the IBC Preliminary Prospectus and the IBC Prospectus or
     other material permitted by the Act.

          3.  Representations and Warranties of the Company.
              --------------------------------------------- 
The Company represents and warrants to and agrees with the Underwriters that:
<PAGE>
 
                                                                              10

          (a) A registration statement on Form S-3 (File No. 333-27959) has been
     filed with the Commission and either (i) has been declared effective under
     the Act and is not proposed to be amended or (ii) is proposed to be amended
     by a post-effective amendment.  If such registration statement (the
     "initial Company registration statement") has been declared effective,
     either (A) an additional registration statement (the "additional Company
     registration statement") relating to the SAILS may have been filed with the
     Commission pursuant to Rule 462(b) under the Act and, if so filed, has
     become effective upon filing pursuant to such Rule and the SAILS all have
     been duly registered under the Act pursuant to the initial Company
     registration statement and, if applicable, the additional Company
     registration statement or (B) such an additional Company registration
     statement is proposed to be filed with the Commission pursuant to Rule
     462(b) and will become effective upon filing pursuant to such Rule and upon
     such filing the SAILS will all have been duly registered under the Act
     pursuant to the initial Company registration statement and such additional
     Company registration statement.  If the Company does not propose to amend
     such registration statement or if an additional Company registration
     statement has been filed and the Company does not intend to amend it and if
     any post-effective amendment to either such registration statement has been
     filed with the Commission prior to the execution and delivery of this
     Agreement, the most recent such amendment has been declared effective by
     the Commission or has been declared effective by the Commission or has
     become effective upon filing pursuant to Rule 462(c) under the Act or in
     the case of the additional Company registration statement, Rule 462(b).
     For purposes of this Agreement, "Company Effective Time" means with respect
     to the initial Company registration statement or, if filed prior to the
     execution and delivery of this Agreement, the additional Company
     registration statement (i) if the Company has advised you that it does not
     propose to amend such registration statement, the date and time as of which
     such registration statement, or the most recent post-effective amendment
     thereto (if any) filed prior to the execution and delivery of this
     Agreement, was declared effective by the Commission or has become effective
     pursuant to Rule 462(c), or (ii) if the Company has advised you that it
     proposes to file a post-effective amendment to such registration statement,
     the date and time as of which such registration statement, as amended by
     such post-effective amendment is declared effective by the Commission or
     has become effective pursuant to Rule 462(c).  If an additional Company
     registration statement has not been filed prior to the execution and
<PAGE>
 
                                                                              11

     delivery of this Agreement but the Company has advised the Underwriters
     that it purposes to file one, "Company Effective Time" with respect to such
     additional Company registration statement means the date and time as of
     which such registration statement is filed and becomes effective pursuant
     to Rule 462(b).  "Company Effective Date" means the date of the Company
     Effective Time.  The initial Company registration statement, as amended at
     its Company Effective Time and all material incorporated by reference
     therein, including all information contained in the additional Company
     registration statement (if any) and deemed to be a part of the initial
     Company registration statement as of the Company Effective Time of the
     additional Company registration Statement pursuant to the General
     Instructions of Form S-3 on which it is filed and including all information
     (if any) deemed to be a part of the initial IBC registration statement as
     of its Company Effective Time pursuant to Rule 430A(b) under the Act, is
     hereinafter referred to as the "Initial Company Registration Statement".
     The additional Company registration statement (if any), as amended at its
     Company Effective Time, including the contents of the initial Company
     registration statement incorporated by reference therein and including all
     information (if any) deemed to be a part of the additional Company
     registration statement as of its Company Effective Time pursuant to Rule
     430A(b), is hereinafter referred to as the "Additional Company Registration
     Statement".  The Company Initial Registration Statement and the Additional
     Company Registration Statement are hereinafter referred to collectively as
     the "Company Registration Statements" and individually as a "Company
     Registration Statement".  The form of prospectus relating to the SAILS, as
     first filed with the Commission pursuant to and in accordance with Rule
     424(b) under the Act or (if no such filing is required) as included in an
     Company Registration Statement, including all material incorporated by
     reference in such prospectus, is hereinafter referred to as the "Company
     Prospectus". Copies of such registration statement and amendments and of
     each related preliminary prospectus and prospectus supplement ("Preliminary
     Company Prospectuses") have been delivered to the Underwriters.

          (b) If the Company Effective Time is prior to the execution and
     delivery of this Agreement:  (i) on the Company Effective Date, the Initial
     Company Registration Statement conformed in all material respects to the
     requirements of the Act, the Rules and Regulations and the Trust Indenture
     Act of 1939, as amended (the "Trust Indenture Act"), and did not include
     any untrue statement of a material fact or omit
<PAGE>
 
                                                                              12

     to state any material fact required to be stated therein or necessary to
     make the statements therein not misleading and on the Company Effective
     Date of the Additional Company Registration Statement (if any), each
     Company Registration Statement conformed, or will conform, in all material
     respects to the requirements of the Act and the Rules and Regulations and
     did not include, or will not include, any untrue statement of a material
     fact and did not omit, or will not omit, to state any material fact
     required to be stated therein or necessary to make statements therein not
     misleading, and (ii) on the date of this Agreement, the Initial Company
     Registration Statement and, if the Company Effective Time of the Additional
     Company Registration Statement (if any) is prior to the execution of this
     Agreement, the Additional Company Registration Statement each conforms, and
     at the time of filing of the Company Prospectus pursuant to Rule 424(b) and
     at all times subsequent thereto up to and at the First Closing Date or any
     Option Closing Date, as the case may be, each Company Registration
     Statement and the Company Prospectus and any amendments or supplements
     thereto will conform, in all material respects to the requirements of the
     Act, the Rules and Regulations and the Trust Indenture Act, and neither of
     such documents includes, or will include, any untrue statement of a
     material fact or omits, or will omit, to state any material fact required
     to be stated therein or necessary to make the statements therein not
     misleading.  If the Company Effective Time is subsequent to the execution
     and delivery of this Agreement, on the Company Effective Date and at all
     times subsequent thereto up to and at the First Closing Date or any Option
     Closing Date, as the case may be, the Initial Company Registration
     Statement and the Company Prospectus and any amendments or supplements
     thereto will conform in all material respects to the requirements of the
     Act, the Rules and Regulations and the Trust Indenture Act, and neither of
     such documents will include any untrue statement of a material fact or will
     omit to state any material fact required to be stated therein or necessary
     to make the statements therein not misleading.  The two preceding sentences
     do not apply to statements in or omissions from a Company Registration
     Statement or the Company Prospectus based upon written information
     furnished to the Company by IBC or any Underwriter through CSFBC for use
     therein, it being understood and agreed that the only such information is
     that described as such in Section 10.  The Company Information (as defined
     herein) provided to IBC for use in each IBC Registration Statement and any
     amendments or supplements thereto and the IBC Prospectus and any amendments
     or supplements thereto, does not include, or will not include, any untrue
<PAGE>
 
                                                                              13

     statement of a material fact or omit to state any material fact required to
     be stated therein or necessary to make the statements therein not
     misleading.  The Commission has not issued any order preventing or
     suspending the use of any Preliminary Company Prospectus or the Company
     Prospectus.

          (c) The Company and each of the Company's Significant Subsidiaries (as
     hereinafter defined) have been duly incorporated and are validly existing
     as corporations in good standing under the laws of their respective
     jurisdictions of incorporation with full corporate power and corporate
     authority to own, lease and operate their respective properties and conduct
     then respective businesses as described in each Company Registration
     Statement; and the Company and each of the Company's Significant
     Subsidiaries are duly qualified to do business as foreign corporations and
     are in good standing in each jurisdiction in which their respective
     ownership or lease of property or the conduct of then respective businesses
     requires such qualification, except where the failure to be so qualified
     would not have a material adverse effect on the condition (financial or
     otherwise), earnings, prospects or results of operations or business of the
     Company and the Company's Significant Subsidiaries taken as a whole (a
     "Company Material Adverse Effect").

          (d) The documents incorporated by reference in each Company
     Registration Statement or the Company Prospectus, when they became
     effective or were filed with the Commission, as the case may be, under the
     Exchange Act, conformed, and any documents so filed and incorporated before
     the First Closing Date will, when they are filed with the Commission,
     conform, in all material respects to the requirements of the Act and the
     Exchange Act, as applicable, the Rules and Regulations and the Exchange Act
     Rules and Regulations.

          (e) The SAILS conform in all material respects to the statements
     relating thereto contained in each Company Registration Statement and the
     Company Prospectus (and such statements correctly state the substance of
     the instruments defining the obligations of the Company in all material
     respects).

          (f) The Indenture has been duly authorized by the Company and the
     SAILS to be purchased from the Company hereunder have been duly authorized
     for issuance and sale to the Underwriters pursuant to this Agreement; the
     Indenture has been duly qualified under the Trust Indenture Act; and the
     Indenture, when the First Supplemental Indenture is duly executed and
     delivered, and the SAILS, when they are duly executed,
<PAGE>
 
                                                                              14

     authenticated and issued as contemplated hereby and by the Indenture and
     delivered against payment therefor in accordance with the terms of this
     Agreement, will constitute valid and legally binding obligations of the
     Company enforceable in accordance with their respective terms subject to
     bankruptcy, insolvency, reorganization, moratorium, fraudulent conveyance
     or other similar laws affecting creditors' rights generally or by general
     equitable principles.

          (g) Except as set forth in or incorporated by reference in the Company
     Prospectus, there is not any pending or, to the Company's knowledge any
     threatened action, suit, claim or proceeding by or before any court or
     governmental agency, authority or body or otherwise against the Company or
     any of its subsidiaries or any of their respective officers or any of their
     respective properties, assets or rights which would or could reasonably be
     expected to have a Company Material Adverse Effect or prevent consummation
     of the transactions contemplated herein.

          (h) No consent, approval, authorization or order of, or filing with,
     any governmental agency or body or any court is required for the execution,
     delivery and performance of this Agreement and the Indenture in connection
     with the issuance or sale of the SAILS by the Company or the consummation
     by the Company of the transactions contemplated by this Agreement, except
     such as may be required under the Act, the Rules and Regulations, the
     Exchange Act, the Exchange Act Rules and Regulations, the Trust Indenture
     Act or under state or other securities or Blue Sky laws, rules and
     regulations.

          (i) The Company has full legal right, corporate power and corporate
     authority to enter into this Agreement and perform the transactions
     contemplated hereby; this Agreement has been duly authorized, executed and
     delivered by the Company and is a valid and binding agreement of the
     Company, enforceable against the Company in accordance with its terms,
     except as the indemnification and contribution provisions hereunder may be
     limited by applicable law and except as enforceability may be limited by
     applicable bankruptcy, insolvency, reorganization, moratorium, fraudulent
     conveyance or other similar laws relating to or affecting creditors' rights
     generally or by general equitable principles.

          (j) The execution, delivery and performance of this Agreement and the
     Indenture by the Company and the consummation of the transactions herein
     and therein contemplated, including without limitation the issuance
<PAGE>
 
                                                                              15

     and sale of the SAILS, will not result in a breach or violation of any of
     the terms and provisions of, or constitute a default under, (i) the charter
     or by-laws of the Company or any subsidiary of the Company; (ii) any
     material indenture, mortgage, deed of trust, loan agreement, bond,
     debenture, note or other evidence of indebtedness or any material lease,
     contract, or other agreement or instrument to which the Company or any
     subsidiary of the Company is a party or by which it or any such subsidiary
     or any of their respective properties may be bound; or (iii) any law or any
     order, rule or regulation of any governmental agency to body or any court
     having jurisdiction over the Company or any subsidiary of the Company or
     over the properties of the Company or any such subsidiary.

          (k) Except as described in the Company Prospectus, there are no
     contracts, agreements or understandings between the Company and any person
     granting such person any preemptive right, co-sale right, right of first
     refusal or right to require the Company to file a registration statement
     under the Act with respect to any securities of the Company owned or to be
     owned by such person or to require the Company to include such securities
     in the securities registered pursuant to each Company Registration
     Statement or in any securities being registered pursuant to any other
     registration statement filed by the Company under the Act.

          (l) Price Waterhouse LLP, who have audited the annual consolidated
     financial statements, together with the related schedules and notes, of the
     Company incorporated by reference as a part of each Company Registration
     Statement, are independent accountants within the meaning of the Act and
     the Rules and Regulations; the audited consolidated financial statements of
     the Company, together with the related notes, forming part of each Company
     Registration Statement and the Company Prospectus, fairly present the
     consolidated financial position and the results of operations of the
     Company at the respective dates and for the respective periods to which
     they apply; all audited consolidated financial statements of the Company,
     together with the related schedules and notes, and all interim unaudited
     consolidated financial information of the Company incorporated by reference
     as part of each Company Registration Statement have been prepared in
     accordance with generally accepted accounting principals consistently
     applied throughout the periods involved, except as may be otherwise stated
     therein; the financial data included in each Company Registration Statement
     present fairly the information shown therein and have been compiled on a
     basis
<PAGE>
 
                                                                              16

     substantially consistent with the financial statements incorporated by
     reference therein; and no other financial statements or schedules or notes
     are required to be included in each Company Registration Statement.

          (m) Subsequent to the respective dates as of which information is
     given in each Company Registration Statement and the Company Prospectus,
     there has not been or occurred (i) any change, nor any development or event
     involving a prospective material adverse change in the business, property
     or assets described or referred to in each Company Registration Statement,
     or the condition (financial or otherwise), earnings, prospects or results
     of operations or business of the Company which could have a Company
     Material Adverse Effect, (ii) any transaction which is material to the
     Company and its subsidiaries taken as a whole, except transactions in the
     ordinary course of business, (iii) any obligation, direct or contingent,
     incurred by the Company which is material to the Company and its
     subsidiaries taken as a whole, except obligations incurred in the ordinary
     course of business or (iv) any change in the capital stock or outstanding
     indebtedness of the Company which is material to the Company and its
     subsidiaries taken as a whole.

          (n) Neither the Company nor any of its subsidiaries (i) is in
     violation of their respective charter or by-laws, (ii) is in default, and
     no event has occurred which, with notice or lapse of time or both, would
     constitute a breach or default, in the due performance or observance of any
     term, covenant or condition contained in any indenture, mortgage, deed of
     trust, loan agreement or other agreement or instrument to which they are
     parties or by which they are bound or to which any of their respective
     properties or assets are subject or (ii) is in violation of any law,
     ordinance, governmental rule, regulation or court decree to which they or
     their respective property or assets may be subject or have failed to
     obtain, comply with or maintain the effectiveness of any license, permit,
     certificate, franchise or other governmental authorization or permit
     necessary to the ownership of their respective property or to the conduct
     of their respect businesses except, in the case of clauses (ii) and (iii),
     for those defaults, violations or failures which, either individually or in
     the aggregate, would not or could not reasonably be expected to have a
     Company Material Adverse Effect.

          (o) The Company is not regulated, and after giving effect to the
     offering and sale of the SAILS and the application of the proceeds as
     described in the Company Prospectus, will not be required to be
<PAGE>
 
                                                                              17

     registered, as an "investment company" as such term is defined under the
     1940 Act.

          (p) The Company and its subsidiaries own or possess adequate rights to
     use all material trademarks, service marks, trade names and copyrights
     described or referred to in the Company Prospectus as owned or used by it
     or which are necessary for the conduct of its business as described in the
     Company Prospectus; the Company has not received any notice of infringement
     of or conflict with asserted rights of others with respect to any patents,
     patent rights, inventions, trade secrets, know-how, trademarks, service
     marks, trade names or copyrights which, singly or in the aggregate, if the
     subject of an unfavorable decision, ruling or finding, would have a Company
     Material Adverse Effect.

          (q) The Company has not taken and will not take, directly or
     indirectly, any action which is designed to or which has constituted or
     which might reasonably be expected to cause or result in the stabilization
     or manipulation of the price of any security of the Company to facilitate
     the sale or resale of the SAILS.

          (r) The Company has not distributed and will not distribute any
     prospectus or other offering materials in connection with the offering and
     sale of SAILS other than the Company Preliminary Prospectus and the Company
     Prospectus or other material permitted by the Act.

          4.  Purchase, Sale and Delivery of SAILS.  On the basis of the
              ------------------------------------                      
representations, warranties and agreements herein contained, but subject to the
terms and conditions herein set forth, the Company agrees to sell to the
Underwriters and the Underwriters agree, severally and not jointly, to purchase
from the Company, at a purchase price of $60.0875 per SAILS, the respective
number of Firm SAILS set forth opposite the names of the Underwriters on
Schedule A hereto.

          The Company shall deliver against payment of the purchase price the
Firm SAILS in the form of one or more permanent global SAILS in definitive form
(the "Firm Global SAILS") deposited with the Trustee as custodian for The
Depository Trust Company ("DTC") and registered in the name of Cede & Co., as
nominee for DTC.  Interests in any permanent global SAILS will be held only in
book-entry form through DTC, except in the limited circumstances described in
the Company Prospectus.  Payment for the Firm SAILS shall be made by the
Underwriters by wire transfer of same-day funds at a bank acceptable to CSFBC at
the New York City offices of Simpson Thacher & Bartlett (or at such other place
as may be agreed upon among the Underwriters and the Company), at 10:00 A.M.,
New York time, on July 29, 1997, or at such other time not later than seven full
business days thereafter as CSFBC and the Company
<PAGE>
 
                                                                              18

determine, such time being herein referred to as the "First Closing Date,"
against delivery to the Trustee as custodian for DTC of the Firm Global SAILS
representing all of the Firm SAILS.  The Firm SAILS will be made available for
checking at the office of CSFBC or such other location as CSFBC may reasonably
request at least 24 hours prior to the First Closing Date.

          In addition, upon written notice from CSFBC to the Company from time
to time not more than 30 days subsequent to the date of the Company Prospectus
(or, if such 30th day shall be a Saturday, Sunday or holiday, on the next
business day thereafter when the NYSE is open for trading), the Underwriters may
purchase all or less than all of the Option SAILS at the purchase price per SAIL
to be paid for the Firm SAILS.  The Company agrees to sell to the Underwriters
and the Underwriters agree, severally and not jointly, to purchase from the
Company, the number of Option SAILS specified in such notice to the Company.
Such Option SAILS shall be purchased by the Underwriters only for the purpose of
covering over-allotments made in connection with the sale of the Firm SAILS.
The number of Option SAILS to be so purchased by each of the Underwriters upon
exercise of such option shall be the same proportion to the total number of
Option SAILS being purchased by each Underwriter pursuant to the exercise of
such option as the number of Firm SAILS purchased by such Underwriter (set forth
in Schedule A hereto) bears to the total number of Firm SAILS purchased by the
Underwriters, adjusted by CSFBC in such a manner as to avoid fractional SAILS.
No Option SAILS shall be sold or delivered unless the Firm SAILS have been
simultaneously or were previously sold and delivered.  The right to purchase the
Option SAILS or any portion thereof may be surrendered and terminated at any
time upon notice by CSFBC to the Company.

          Each time for the delivery of and payment for the Option SAILS (each
such time herein referred to as an "Option Closing Date"), which may be the
First Closing Date (the First Closing Date and each Option Closing Date, if any,
being some times referred to as a "Closing Date"), shall be determined by CSFBC
but shall be not later than seven full business days after written notice of
election to purchase Option SAILS is given.  The Company will deliver, against
payment of the purchase price, the Option SAILS being purchased on each Option
Closing Date in the form of one or more permanent global SAILS in definitive
form (each, an "Option Global SAILS") deposited with the Trustee as custodian
for DTC and registered in the name of Cede & Co., as nominee for DTC.  Payment
for such Option SAILS shall be made by the Underwriters by wire transfer of
same-day funds at a bank acceptable to CSFBC drawn to the order of the Company
at the above office of Simpson Thacher & Bartlett against delivery to the
Trustee as custodian for DTC of the Option Global SAILS representing all of the
Option SAILS being purchased on such Option Closing Date.
<PAGE>
 
                                                                              19

          5.  Offering by Underwriters.  It is understood that the Underwriters
              ------------------------                                         
propose to offer the SAILS for sale to the public as set forth in the Company
Prospectus.

          6.  Certain Additional Agreements of IBC.  IBC agrees with the
              ------------------------------------                      
Underwriters or the Company, if applicable, that:

          (a) If the IBC Effective Time of the Initial IBC Registration
     Statement is prior to the execution and delivery of this Agreement, IBC
     will file the IBC Prospectus with the Commission pursuant to and in
     accordance with subparagraph (1) (or, if applicable and if consented to by
     CSFBC, subparagraph (4)) of Rule 424(b) not later than the earlier of (A)
     the second business day following the execution and delivery of this
     Agreement or (B) the fourth business day after the IBC Effective Date.  IBC
     will advise the Underwriters and the Company promptly of any such filing
     pursuant to Rule 424(b).  If the IBC Effective Time of the Initial IBC
     Registration Statement is prior to the execution and delivery of this
     Agreement and an additional IBC registration statement is necessary to
     register a portion of the IBC Common Stock under the Act but the IBC
     Effective Time thereof has not occurred as of such execution and delivery,
     the Company will file the additional IBC registration statement or, if
     filed, will file a post-effective amendment thereto with the Commission
     pursuant to and in accordance with Rule 462(b) on or prior to 10:00 P.M.,
     New York time, on the date of this Agreement or, if earlier, on or prior to
     the time the IBC Prospectus is printed and distributed to any Underwriter,
     or will make such filing at such later date as shall have been consented to
     by CSFBC;

          (b) IBC will advise the Underwriters and the Company promptly of any
     proposal to amend or supplement the initial or any additional IBC
     registration statement as filed or the related prospectus to the Initial
     IBC Registration Statement, the Additional IBC Registration Statement or
     the IBC Prospectus (including any amendment to a document required to be
     filed under the Exchange Act which, upon filing, is deemed to be
     incorporated by reference therein) and will not effect such amendment or
     supplementation without (i) the consent of CSFBC, which will not be
     unreasonably withheld, in the case of an amendment to the initial or any
     additional IBC registration statement as filed or the related prospectus or
     the Initial IBC Registration Statement, Additional IBC Registration
     Statement or the IBC Prospectus and (ii) giving CSFBC a reasonable
     opportunity to review and comment on such amendment or supplementation in
     the case of an amendment or supplement to a document incorporated by
     reference; and IBC will also advise CSFBC and the Company promptly of
<PAGE>
 
                                                                              20

     the effectiveness of each IBC Registration Statement (if the IBC Effective
     Time is subsequent to the execution and delivery of this Agreement) and of
     any amendment or supplementation of each IBC Registration Statement or the
     IBC Prospectus and of the institution by the Commission of any stop order
     proceedings in respect of each IBC Registration Statement and will use all
     reasonable efforts to prevent the issuance of any such stop order and to
     obtain as soon as possible its lifting, if issued;

          (c) If, at any time when a prospectus relating to the IBC Shares is
     required to be delivered under the Act in connection with sales by any
     Underwriter or dealer, any event occurs as a result of which the IBC
     Prospectus as then amended or supplemented would include an untrue
     statement of a material fact or omit to state any material fact necessary
     to make the statements therein, in the light of the circumstances under
     which they were made, not misleading, or if it is necessary at any such
     time to amend the IBC Prospectus to comply with the Act, IBC will promptly
     amend the IBC Prospectus to comply with the Act, IBC will promptly notify
     CSFBC and the Company of such event and will promptly prepare and file with
     the Commission, at its own expense (unless such amendment relates to
     information provided by the Company or the terms of the SAILS, in which
     case it shall be at the Company's expense), an amendment or supplement
     which will correct such statement or omission or an amendment which will
     effect such compliance.  Neither CSFBC's consent to, nor the Underwrites'
     delivery of, any such amendment or supplement shall constitute a waiver of
     any of the conditions set forth in Section 9;

          (d) IBC will furnish to the Underwriters copies of each IBC
     Registration Statement (six of which will be signed and will include all
     exhibits), each related IBC Preliminary Prospectus, and, so long as
     delivery of a prospectus relating to the IBC Shares is required to be
     delivered under the Act in connection with sales by any Underwriters or
     dealer, the IBC Prospectus and all amendments and supplements to such
     documents, in each case in such quantities as CSFBC requests.  The IBC
     Prospectus shall be so furnished on or prior to 3:00 P.M. New York time, on
     the business day following the later of the execution and delivery of this
     Agreement or the Effective Time of the Initial Registration Statement.  All
     other documents shall be so furnished as soon as available.  IBC and the
     Company will pay the expenses of printing and distributing to the
     Underwriters all such documents as agreed between them;
<PAGE>
 
                                                                              21

          (e) IBC will arrange for the qualification of the IBC Shares for sale
     under the laws of such jurisdictions as CSFBC may designate and will
     continue such qualifications in effect so long as required for the
     distribution, except that IBC shall not be required in connection therewith
     or as a condition thereof to qualify as a foreign corporation or to execute
     a general consent to service of process in any jurisdiction or to make any
     undertaking with respect to the conduct of its business.  In each
     jurisdiction in which the IBC Shares shall have been qualified as above
     provided, IBC will file such statements and reports in each year as are or
     may be reasonably required by the laws of such jurisdiction;

          (f) During the period of three years after the date of this Agreement,
     IBC will furnish to CSFBC, (i) concurrently with furnishing such reports,
     if any, to its stockholders, quarterly reports of operations of IBC for
     each of the first three quarters in the form furnished to IBC's
     stockholders; (ii) concurrently with furnishing such reports to its
     stockholders, annual reports of IBC as of the end of each fiscal year
     (including financial statements audited by independent public accountants);
     (iii) as soon as they are available, copies of all other reports (financial
     or other) furnished to stockholders; (iv) as soon as they are available,
     copies of all reports and financial statements furnished to or filed with
     the Commission, any securities exchange or the National Association of
     Securities Dealers, Inc. ("NASD"); and (v) any additional information of a
     public nature concerning IBC or its business which CSFBC may reasonably
     request.  During such three-year period, if IBC shall have active
     subsidiaries, the foregoing financial statements shall be on a consolidated
     basis to the extent that the accounts of IBC and its subsidiaries are
     consolidated and shall be accompanied by similar financial statements for
     any significant subsidiary which is not so consolidated;

          (g) So long as the SAILS are Outstanding (as defined in the
     Indenture), and at the Company's expense, IBC will furnish to the Trustee
     and the Company in sufficient quantity, copies of all annual reports and
     proxy statements provided by IBC to its stockholders generally (the "IBC
     Reports");

          (h) During a period of 90 days after the date of the initial public
     offering of the SAILS, IBC will not, and will cause its directors and
     officers not to, without the prior written consent of CSFBC, issue, sell,
     offer, agree to sell, pledge or otherwise dispose of, directly or
     indirectly, or file with the Commission
<PAGE>
 
                                                                              22

     a registration statement under the Act relating to any additional shares of
     IBC Common Stock, any options, warrants or other rights to purchase any
     shares of IBC Common Stock, or any securities convertible into, exercisable
     for or exchangeable for shares of IBC Common Stock, other than (i) sales of
     IBC Common Stock by the Company to IBC and (ii) options granted and IBC
     Common Stock issued pursuant to employee benefit and stock option plans
     existing on the date hereof; and

          (i) IBC shall take such action as may be reasonably necessary to
     comply with the rules and regulations of the NASD in respect of IBC Common
     Stock to be registered in connection with the offering by the Company of
     the SAILS.

          7.  Further Agreements of the Company.  The Company covenants and
              ---------------------------------                            
agrees with the Underwriters that:

          (a) If the Company Effective Time of the Initial Company Registration
     Statement is prior to the execution and delivery of this Agreement, the
     Company will file the Company Prospectus with the Commission pursuant to
     and in accordance with subparagraph (1) (as, if applicable and if consented
     to by CSFBC, subparagraph (4)) of Rule 424(b) not later than the earlier of
     (A) the second business day following the execution and delivery of this
     Agreement or (B) the fourth business day after the Company Effective Date.
     The Company will advise the Underwriters and IBC promptly of any such
     filing pursuant to Rule 424(b).  If the Company Effective Time of the
     Initial Company Registration Statement is prior to the execution and
     delivery of this Agreement and an additional Company registration statement
     is necessary to register a portion of the SAILS under the Act but the
     Company Effective Time thereof has not occurred as of such execution and
     delivery, the Company will file the additional Company registration
     statement or, if filed, will file a post-effective amendment thereto with
     the Commission pursuant to and in accordance with Rule 462(b) on or prior
     to 10:00 P.M., New York time, on the date of this Agreement or, if earlier,
     on or prior to the time the IBC Prospectus is printed and distributed to
     any Underwriter, or will make such filing at such later date as shall have
     been consented to by CSFBC;

          (b) The Company will advise the Underwriters and IBC promptly of any
     proposal to amend or supplement the initial or any additional Company
     registration statement as filed or the related prospectus to the Initial
     Company Registration Statement, the Additional Company Registration
     Statement or the Company Prospectus (including any amendment to a document
<PAGE>
 
                                                                              23

     required to be filed under the Exchange Act which, upon filing, is deemed
     to be incorporated by reference therein) and will not effect such amendment
     or supplementation without CSFBC's consent, which consent will not be
     unreasonably withheld; and the Company will also advise CSFBC and IBC
     promptly of the effectiveness of each Company Registration Statement (if
     the Company Effective Time is subsequent to the execution and delivery of
     this Agreement) and of any amendment or supplementation of each Company
     Registration Statement or the Company Prospectus and of the institution by
     the Commission of any stop order proceedings in respect of each Company
     Registration Statement and will use all reasonable efforts to prevent the
     issuance of any such stop order and to obtain as soon as possible its
     lifting, if issued;

          (c) If, at any time when a prospectus relating to the SAILS is
     required to be delivered under the Act in connection with sales by any
     Underwriter or dealer, any event occurs as a result of which the Company
     Prospectus as then amended or supplemented which would include an untrue
     statement of a material fact or omit to state any material fact necessary
     to make the statements therein, in the light of the circumstances under
     which they were made, not misleading, or if it is necessary at any such
     time to amend the Company Prospectus to comply with the Act, the Company
     will promptly notify CSFBC of such event and will promptly prepare and file
     with the Commission, at its own expense (unless such amendment relates to
     information provided by IBC in which case it shall be at IBC's expense), an
     amendment or supplement which will correct such statement or omission or an
     amendment, which will effect such compliance.  Neither CSFBC's consent to,
     not the Underwriters' delivery of, any such amendment or supplement shall
     constitute a waiver of any of the conditions set forth in Section 9;

          (d) The Company will furnish to the Underwriters copies of each
     Company Registration Statement (six of which will be signed and will
     include all exhibits), each related Company Preliminary Prospectus, and, so
     long as delivery of a prospectus relating to the SAILS is required to be
     delivered under the Act in connection with sales by any Underwriter or
     dealer, the Company Prospectus and all amendments and supplements to such
     documents, in each case in such quantities as CSFBC requests.  The Company
     Prospectus shall be so furnished on or prior to 3:00 P.M. New York time, on
     the business day following the later of the execution and delivery of this
     Agreement or the Effective Time of the Initial Registration Statement.  All
     other documents shall be so furnished as soon as available.  IBC and the
     Company
<PAGE>
 
                                                                              24

     will pay the expenses of printing and distributing to the Underwriters all
     such documents as agreed between them;

          (e) The Company will arrange for the qualification of the SAILS for
     sale under the laws of such jurisdictions as CSFBC may designate and will
     continue such qualifications in effect so long as required for the
     distribution of the SAILS contemplated by this Agreement, except that the
     Company shall not be required in connection therewith or as a condition
     thereof to qualify as a foreign corporation or to execute a general consent
     to service of process in any jurisdiction or to make any undertaking with
     respect to the conduct of its business.  In each jurisdiction in which the
     SAILS shall have been qualified as above provided, the Company will file
     such statements and reports in each year as are or may be reasonably
     required by the laws of such jurisdiction;

          (f) During the period of three years after the date of this Agreement,
     the Company will furnish to CSFBC, (i) concurrently with furnishing such
     reports, if any, to its stockholders, quarterly reports of operations of
     the Company for each of the first three quarters in the form furnished to
     the Company's stockholders; (ii) concurrently with furnishing such reports
     to its stockholders, annual reports of the Company as of the end of each
     fiscal year (including financial statements audited by independent public
     accountants; (iii) as soon as they are available, copies of all other
     reports (financial or other) furnished to stockholders; (iv) as soon as
     they are available, copies of all reports and financial statements
     furnished to or filed with the Commission, any securities exchange or the
     NASD; and (v) any additional information of a public nature concerning the
     Company or its business which CSFBC may reasonably request.  During such
     three-year period, if the Company shall have active subsidiaries, the
     foregoing financial statements shall be on a consolidated basis to the
     effect that the accounts of the Company and its subsidiaries are
     consolidated and shall be accompanied by similar financial statements for
     any significant subsidiary which is not so consolidated;

          (g) The Company will apply the net proceeds from the sale of the SAILS
     being sold by it hereunder substantially in the manner set forth under the
     caption "Use of Proceeds" in the Company Prospectus;

          (h) During a period of 90 days after the date of the initial public
     offering of the SAILS, the Company will not, without the prior written
     consent of CSFBC,
<PAGE>
 
                                                                              25

     issue, sell, offer, agree to sell, pledge, or otherwise dispose of,
     directly or indirectly, or file with the Commission a registration
     statement under the Act relating to any additional SAILS or shares of IBC
     Common Stock, any options, warrants or other rights to purchase any shares
     of IBC Common Stock, or any securities convertible into, exercisable for or
     exchangeable for shares of IBC Common Stock (other than the IBC Common
     Stock offered pursuant to the Company Prospectus and IBC Prospectus or
     sales by the Company to IBC of IBC Common Stock); and

          (i) The Company will not, without the Underwriters' consent, offer or
     sell, or publicly announce its intention to sell, any debt securities
     having a maturity of more than one year covered by any registration
     statement filed under the Act (except under prior contractual commitments
     or pursuant to bank credit agreements) during the period beginning on the
     date of this Agreement and ending 30 days following the First Closing Date.

          8.  Expenses.  The Company and IBC further agree with the Underwriters
              --------                                                          
that:

          (a) The Company and IBC will pay all (i) expenses incident to the
     performance of the Company's and IBC's obligations under this Agreement
     (such expenses to be allocated between them as the Company and IBC may
     agree) and will reimburse the Underwriters for any reasonable expenses,
     including fees, charges and disbursements of Simpson Thacher & Bartlett,
     counsel for the Underwriters ("Underwriters' Counsel"), reasonably incurred
     in connection with qualification of each of the SAILS and IBC Common Stock
     for sale and determination of their eligibility for investment under the
     laws of such jurisdictions as CSFBC designates and the printing of
     memoranda relating thereto, (ii) fees charged by investment rating agencies
     for the rating of the SAILS, (iii) travel expenses of the Company's and
     IBC's officers and employees and any other expenses of the Company and IBC
     in connection with attending or hosting meetings with prospective
     purchasers of the SAILS and (iv) expenses incurred in distributing any
     Preliminary Company Prospectus, Preliminary IBC Prospectus, the Company
     Prospectus and the IBC Prospectus (including any amendments and supplements
     thereto) to the Underwriters; and

          (b) If the transactions contemplated hereby are not consummated by
     reason of any failure, refusals or inability on the part of the Company or
     IBC, as the case may be, to perform any agreement on their respective parts
     to be performed hereunder or to
<PAGE>
 
                                                                              26

     fulfill any condition of the Underwriters' obligations hereunder, the
     Company and IBC will reimburse the Underwriters for all out-of-pocket
     expenses (including reasonable fees, charges and disbursements of
     Underwriters' Counsel) reasonably incurred by the Underwriters in
     investigating, preparing to market or marketing the SAILS.

          9.  Conditions of the Obligations of the Underwriters.  The
              -------------------------------------------------      
obligations of the several Underwriters to purchase and pay for the Firm SAILS
on the First Closing Date and the Option SAILS to be purchased on each Option
Closing Date will be subject to the accuracy of the representations and
warranties of IBC and the Company herein, to the accuracy of the statements of
Company officers or IBC officers made pursuant to the provisions hereof, to the
performance by IBC and the Company of their respective obligations hereunder,
and to each of the following additional conditions precedent:

          (a) The Underwriters shall have received a letter, dated the date of
     delivery thereof (which, if the IBC Effective Time of the Initial IBC
     Registration Statement is prior to the execution and delivery of this
     Agreement, shall be on or prior to the date of this Agreement or, if the
     IBC Effective Time of the Initial IBC Registration Statement is subsequent
     to the execution and delivery of this Agreement, shall be prior to the
     filing of the amendment or post-effective amendment to the Initial IBC
     Registration Statement to be filed shortly prior to the IBC Effective
     Time), of Deloitte & Touche LLP confirming that they are independent public
     accountants within the meaning of the Act and the Rules and Regulations and
     stating in effect that:

               (i)   in their opinion the financial statements and schedules
                     examined by them and included in the IBC Registration
                     Statements or incorporated by reference therein comply in
                     form in all material respects with the applicable
                     accounting requirements of the Act and the related
                     published Rules and Regulations;

               (ii)  on the basis of a reading of the latest available interim
                     financial statements of IBC, inquiries of officials of IBC
                     who have responsibility for financial and accounting
                     matters and other specified procedures, nothing came to
                     their attention that caused them to believe that:
<PAGE>
 
                                                                              27

               (A)  at the date of the latest available balance sheet read by
                    Deloitte & Touche LLP, or at a subsequent specified date not
                    more than three business days prior to the date of this
                    Agreement, there was any change in the capital stock or any
                    increase in short-term indebtedness or long-term debt of IBC
                    or, at the date of the latest available balance sheet read
                    by such accountants, there was any decrease in net assets,
                    as compared with amounts shown on the latest balance sheet
                    included in the IBC Prospectus; or

               (B)  for the period from the closing date of the latest income
                    statement included in the IBC Prospectus to the closing date
                    of the latest available income statement read by such
                    accountants, there were any decreases, as compared with the
                    corresponding period of the previous year, in the net sales
                    or total amount of net income;

               except in all cases set forth in clauses (A) and (B) above for
               changes, increases or decreases which the IBC Prospectus
               discloses have occurred or may occur or which are described in
               such letter; and

      (iii)    they have compared specified dollar amounts (or percentages
               derived from such dollar amounts) and other financial information
               contained in the IBC Registration Statements or incorporated by
               reference therein (in each case to the extent that such dollar
               amounts, percentages and other financial information are derived
               from the general accounting records of IBC and its subsidiaries
               subject to the internal controls of IBC's accounting system or
               are derived directly form such records by analysis or
               computation) with the results obtained from inquiries, a reading
               of such general accounting records and other procedures specified
               in such letter and have found such dollar amounts, percentages
               and other financial information to be in agreement
<PAGE>
 
                                                                              28

               with such results, except as otherwise specified in such letter.

     For purposes of this Section 9(a), (i) if the IBC Effective Time of the
     Initial IBC Registration Statement is subsequent to the execution and
     delivery of this Agreement, "IBC Registration Statements" shall mean the
     initial IBC registration statement as proposed to be amended by the
     amendment or post-effective amendment to be filed shortly prior to its IBC
     Effective Time, (ii) if the IBC Effective Time of the Initial IBC
     Registration Statement is prior to the execution and delivery of this
     Agreement but the IBC Effective Time of the Additional IBC Registration
     Statement (if any) is subsequent to such execution and delivery, "IBC
     Registration Statements" shall mean the Initial IBC Registration Statement
     and the additional IBC registration statement as proposed to be filed or as
     proposed to be amended by the post-effective amendment to be filed shortly
     prior to its IBC Effective Time, and (iii) "Prospectus" shall mean the
     prospectus included in the IBC Registration Statements.

          (b) The Underwriters shall have received a letter, dated the date of
     delivery thereof (which, if the Company Effective Time of the Initial
     Company Registration Statement is prior to the execution and delivery of
     this Agreement, shall be on or prior to the date of this Agreement or, if
     the Company Effective Time of the Initial Company Registration Statement is
     subsequent to the execution and delivery of this Agreement, shall be prior
     to the filing of the amendment or post-effective amendment to the Company
     Registration Statement to be filed shortly prior to the Company Effective
     Time), of Price Waterhouse LLP confirming that they are independent public
     accountants within the meaning of the Act and the Rules and Regulations and
     stating in effect that:

               (i)   in their opinion the financial statements and schedules
                     audited by them and included in the Company Registration
                     Statements or incorporated by reference therein comply in
                     form in all material respects with the applicable
                     accounting requirements of the Act and the related
                     published Rules and Regulations;

               (ii)  on the basis of a reading of the latest available interim
                     financial statements of the Company, inquiries of officials
                     of the Company who have responsibility for financial and
                     accounting matters and other specified procedures, nothing
                     came
<PAGE>
 
                                                                              29

               to their attention that caused them to believe that:

               (A)  at the date of the latest available balance sheet read by
                    Price Waterhouse LLP, there was any change in the common
                    stock of the Company, any increase in short-term
                    indebtedness or long-term debt of the Company or any
                    decrease in current net assets or shareholders' equity of
                    the Company and its subsidiaries as compared with amounts
                    shown on the latest balance sheet included in the Company
                    Prospectus; or

               (B)  for the period from the closing date of the latest income
                    statement included in the Company Prospectus to the closing
                    date of the latest available income statement read by such
                    accountants there were any decreases, as compared with the
                    corresponding period of the previous year, in the
                    consolidated net sales, earnings before equity earnings or
                    net earnings;

               except in all cases set forth in clauses (A) and (B) above for
               changes, increases or decreases which the Company Prospectus
               discloses have occurred or may occur or which are described in
               such letter; and

      (iii)    they have compared certain specified dollar amounts
               (or percentages derived from such dollar amounts) and other
               financial information contained in the Company Registration
               Statements or incorporated by reference therein, as described in
               such letter (in each case to the extent that such dollar amounts,
               percentages and other financial information are derived from the
               general accounting records of the Company and its subsidiaries
               subject to the internal controls of the Company's accounting
               system or are derived directly from such records by analysis or
               computation) with the results obtained from inquiries, a reading
               of such general accounting records and other procedures specified
               in such letter and have found such dollar amounts, percentages
               and other financial information to be in agreement with such
               results, except as otherwise specified in such letter.
<PAGE>
 
                                                                              30

     For purposes of this Section 9(b), (i) if the Company Effective Time of
     the Initial Company Registration Statement is subsequent to the execution
     and delivery of this Agreement, "Company Registration Statements" shall
     mean the initial Company registration statement as proposed to be amended
     by the amendment or post-effective amendment to be filed shortly prior to
     its Company Effective Time, (ii) if the Company Effective Time of the
     Initial Company Registration Statement is prior to the execution and
     delivery of this Agreement but the Company Effective Time of the Additional
     Company Registration Statement (if any) is subsequent to such execution and
     delivery, "Company Registration Statements" shall mean the Initial Company
     Registration Statement and the additional Company registration statement as
     proposed to be filed or as proposed to be amended by the post-effective
     amendment to be filed shortly prior to its Company Effective Time, and
     (iii) "Prospectus" shall mean the prospectus included in the Company
     Registration Statements.

          (c) If the IBC Effective Time of the Initial Registration Statement is
     not prior to the execution and delivery of this Agreement, the IBC
     Effective Time shall have occurred not later than 10:00 P.M., New York
     time, on the date of this Agreement or such later date as shall have been
     consented to by CSFBC.  If the IBC Effective Time of the Additional IBC
     Registration Statement (if any) is not prior to the execution and delivery
     of this Agreement, such IBC Effective Time shall have occurred not later
     than 10:00 P.M. New York Time, on the date of this Agreement or, if
     earlier, the time the IBC Prospectus is printed and distributed to any
     Underwriter, or shall have occurred at such later date as shall have been
     consented by CSFBC. If the IBC Effective Time of the Initial IBC
     Registration Statement is prior to the execution and delivery of this
     Agreement, the IBC Prospectus shall have been filed with the Commission in
     accordance with the Rules and Regulations and Section 6(a) of this
     Agreement.  Prior to the Closing Date, no stop order suspending the
     effectiveness of any IBC Registration Statement shall have been issued and
     no proceedings for that purpose shall have been instituted or, to the
     knowledge of IBC or the Underwriters, shall be contemplated by the
     Commission.

          (d) If the Company Effective Time of the Initial Registration
     Statement is not prior to the execution and delivery of this Agreement, the
     Company Effective Time shall have occurred no later than 10:00 P.M., New
     York time, on the date of this Agreement of such later date as shall have
     been consented to by CSFBC.  If the Company Effective Time of the
     Additional Company
<PAGE>
 
                                                                              31

     Registration Statement (if any) is not prior to the execution and delivery
     of this Agreement, such Company Effective Time shall have occurred not
     later than 10:00 P.M. New York Time, on the date of this Agreement or, if
     earlier, the time the Company Prospectus is printed and distributed to any
     Underwriter, or shall have occurred at such later date as shall have been
     consented by CSFBC.  If the Company Effective Time of the Initial Company
     Registration Statement is prior to the execution and delivery of this
     Agreement, the Company Prospectus shall have been filed with the Commission
     in accordance with the Rules and Regulations and Section 7(a) of this
     Agreement.  Prior to the Closing Date, no stop order suspending the
     effectiveness of any Company Registration Statement shall have been issued
     and no proceedings for that purpose shall have been instituted or, to the
     knowledge of the Company or the Underwriters, shall be contemplated by the
     Commission.

          (e) Subsequent to the execution and delivery of this Agreement, there
     shall not have occurred (i) any change, or any development or event
     involving a prospective change, in or affecting particularly the condition
     (financial or other), business, properties or results of operations of the
     Company, IBC or their respective subsidiaries which, in the judgment of a
     majority in interest of the Underwriters, including CSFBC, is material and
     adverse and makes it impractical or inadvisable to proceed with completion
     of the public offering or sale of and payment for the SAILS; (ii) any
     downgrading in the rating of any debt securities of the Company by any
     "nationally recognized statistical rating organization" (as defined for
     purposes of Rule 436(g) under the Act), or any public announcement that any
     such organization has under surveillance or review its rating of any debt
     securities of the Company (other than an announcement with positive
     implications of a possible upgrading, and no implication of a possible
     downgrading, of such rating); (iii) any suspension or limitation of trading
     in securities generally on the NYSE, or any setting of minimum prices for
     trading on such exchange, or any suspension of trading of any securities of
     IBC or the Company on any exchange or in the over-the-counter market; (iv)
     any banking moratorium declared by U.S. Federal or New York authorities; or
     (v) any outbreak or escalation of major hostilities in which the United
     States is involved, any declaration of war by Congress or any other
     substantial national or international calamity or emergency if, in the
     judgment of a majority in interest of the Underwriters, including CSFBC,
     the effect of any such outbreak escalation, declaration, calamity or
     emergency makes it impractical or inadvisable to proceed with
<PAGE>
 
                                                                              32

     completion of the public offering or the sale of and payment for the SAILS.

          (f) The Underwriters shall have received an opinion, dated such
     Closing Date, of Shook, Hardy & Bacon L.L.P, counsel for IBC, and an
     opinion from Ray Sandy Sutton, Vice President, Corporate Secretary and
     General Counsel of IBC as to paragraphs (iv) and (v) only,to the effect
     that:

                              (i)   The documents incorporated by reference in
                                    the IBC Registration Statements or the IBC
                                    Prospectus, when they were filed with the
                                    Commission under the Exchange Act, complied
                                    as to form in all material respects with the
                                    requirements of the Exchange Act and the
                                    Exchange Act Rules and Regulations, as
                                    applicable, except that Shook, Hardy & Bacon
                                    L.L.P. need express no opinion with respect
                                    to the financial statements or other
                                    financial data contained or incorporated by
                                    reference therein;

                              (ii)  IBC and Brands have been duly incorporated
                                    and are validly existing as corporations in
                                    good standing under the laws of the State of
                                    Delaware, and have all requisite corporate
                                    power and corporate authority to own their
                                    respective properties and conduct their
                                    respective businesses as described in the
                                    IBC Prospectus; IBC and Brands are duly
                                    qualified to do business as a foreign
                                    corporation and is in good standing in each
                                    jurisdiction in which it owns or leases
                                    substantial properties or the conduct of
                                    their businesses requires such
                                    qualification, except where the failure to
                                    be so qualified or in good standing would
                                    not have an IBC Material Adverse Effect;

                              (iii) The IBC Firm Shares or the IBC Option
                                    Shares, as the case may be, and all of the
                                    issued shares of capital stock of IBC are
                                    duly authorized, validly issued, fully paid
                                    and nonassessable; the capital stock of IBC
                                    (including the IBC Shares) conforms in all
                                    material respects to the statements relating
                                    thereto contained in each IBC Registration
                                    Statement and the IBC Prospectus; the form
                                    of certificate used
<PAGE>
 
                                                                              33

                    to evidence the IBC Common Stock is in due and proper form
                    and otherwise complies with all statutory requirements under
                    the laws of the State of Delaware; except as described in or
                    contemplated by, the IBC Prospectus (including stock option
                    plans described therein), there are no outstanding options,
                    warrants or other rights for the issuance of, and there are
                    not commitments, plans or arrangements to issue, any shares
                    of capital stock of IBC or any security convertible into or
                    exercisable or exchangeable for, any shares of capital stock
                    of IBC;

             (iv)   No consent, approval, authorization or order of, or filing
                    with, any governmental agency or body or any court is
                    required for the consummation of the transactions
                    contemplated by this Agreement, except such as may be
                    required under the Act, the Rules and Regulations, the
                    Exchange Act, the Exchange Act Rules and Regulations or
                    under state or other securities or Blue Sky laws, rules and
                    regulations;

             (v)    The execution, delivery and performance of this Agreement
                    and the consummation of the transactions herein contemplated
                    will not result in a breach or violation of any of the terms
                    and provisions of, or constitute a default under, any
                    statute, any rule, regulation or order of any governmental
                    agency or body or any court having jurisdiction over IBC or
                    any subsidiary of IBC or any of their properties or any
                    agreement or instrument to which IBC or Brands is a party or
                    by which IBC or Brands is bound or to which any of the
                    properties of IBC or Brands is subject, or the charter or
                    bylaws of any subsidiary of IBC;

             (vi)   Except as described in the IBC Prospectus or except as
                    previously waived, there are no contracts, agreements or
                    understandings between IBC and any person granting such
                    person the right to require IBC to file a registration
                    statement under the Act with respect to any securities of
                    IBC owned or to be owned by such person or
<PAGE>
 
                                                                              34

                    to require IBC to include such securities in the securities
                    registered pursuant to each IBC Registration Statement or in
                    any securities being registered pursuant to any other
                    registration statement filed by IBC under the Act;

           (vii)    The Initial IBC Registration Statement was declared
                    effective under the Act as of the date and time specified in
                    such opinion, the Additional IBC Registration Statement (if
                    any) was declared effective under the Act as of a date
                    specified in such opinion, the IBC Prospectus either was
                    filed with the Commission pursuant to the subparagraph of
                    Rule 424(b) specified in such opinion on the date specified
                    therein or was included in the Initial IBC Registration
                    Statement or the Additional IBC Registration Statement (as
                    the case may be), and, to the knowledge of Shook, Hardy &
                    Bacon L.L.P., no stop order suspending the effectiveness of
                    a IBC Registration Statement or any part thereof has been
                    issued and no proceedings for that purpose have been
                    instituted or are pending or contemplated under the Act; and
                    each IBC Registration Statement and the IBC Prospectus, and
                    each amendment or supplement thereto, as of their respective
                    effective or issue dates, or at such Closing Date, as the
                    case may be, complied as to form in all material respects
                    with the requirements of the Act and the Rules and
                    Regulations, except that Shook, Hardy & Bacon L.L.P. need
                    express no opinion with respect to the financial statements
                    or other financial data contained or incorporated by
                    reference therein; no facts have come to the attention of
                    Shook, Hardy & Bacon L.L.P. causing it to believe that
                    either a IBC Registration Statement or the IBC Prospectus,
                    or any such amendment or supplement, as of such respective
                    dates or as of such Closing Date, contained any untrue
                    statement of a material fact or omitted to state any
                    material fact required to be stated therein or necessary to
                    make the statements therein not misleading; any descriptions
                    in a
<PAGE>
 
                                                                              35

                    IBC Registration Statement and the IBC Prospectus of the
                    charter and by-laws of IBC, statutes, legal and governmental
                    proceedings and contracts and other documents are accurate
                    and fairly present the information required to be shown;
                    Shook, Hardy & Bacon L.L.P. does not know of any contracts
                    or documents required to be filed as exhibits to the IBC
                    Registration Statement which are not filed as required, it
                    being understood that Shook, Hardy & Bacon L.L.P. need
                    express no opinion as to the financial statements or other
                    financial data contained in the IBC Registration Statement
                    or the IBC Prospectus.

     In rendering such opinion, Shook, Hardy & Bacon L.L.P. may rely as to the
     materiality of agreements and other factual matters on one or more written
     certificates of officers of IBC or public officials, as and to the extent
     they deem such reliance appropriate.  It is further understood that the
     negative assurance to be given by Shook, Hardy & Bacon L.L.P. with respect
     to material misstatements and omissions in each IBC Registration Statement,
     the IBC Prospectus and each amendment or supplement thereto as set forth in
     paragraph (ix) of this Section 9(f) may be set forth in a separate
     statement in its opinion and need not be set forth in a numbered paragraph
     therein.

          (g) The Underwriters shall have received an opinion, dated such
     Closing Date, from (i) Brian Cave LLP, special tax counsel for the Company,
     to the effect that the discussion presented under the heading "Certain
     United States Federal Income Tax Considerations" in the Company Prospectus
     is an accurate summary of the material federal income tax consequences
     relevant to an investment in the SAILS and (ii) from James Neville, Vice
     President, General Counsel and Assistant Secretary of the Company, to the
     effect that:

                              (i)   The documents incorporated by reference in
                    the Company Registration Statements and the Company
                    Prospectus, when they were filed with the Commission under
                    the Exchange Act, complied as to form in all material
                    respects to the requirements of the Exchange Act and the
                    Exchange Act Rules and Regulations (except that such counsel
                    need express no opinion as to the financial statements and
                    related
<PAGE>
 
                                                                              36

                    schedules and the other financial data contained therein);

              (ii)  Each of the Company and each of Eveready Battery Company
                    Inc., VCS Holding Company, Ralston Overseas Battery Company
                    and Protein Technologies International Inc. (together the
                    "Company Significant Subsidiaries") has been duly
                    incorporated and is a corporation validly existing in good
                    standing under the laws of the jurisdiction of its
                    incorporation, with corporate power and corporate authority
                    to own their respective properties and conduct their
                    respective businesses as described in the Company
                    Prospectus; the Company and each of the Company Significant
                    Subsidiaries are duly qualified to do business as a foreign
                    corporation in each jurisdiction listed as an attachment to
                    the opinion of James M. Neville;

           (iii)    The Indenture has been duly authorized, executed and
                    delivered by the Company and has been duly qualified under
                    the Trust Indenture Act; the Firm SAILS have been duly
                    authorized by the Company; the Firm SAILS or the Option
                    SAILS, as the case may be, have been duly executed by the
                    Company; the Indenture constitutes, and the Firm SAILS and
                    any Option SAILS, when duly authenticated, issued and
                    delivered against payment therefor in accordance with the
                    terms of this Agreement, will constitute, valid and legally
                    binding obligations of the Company, enforceable in
                    accordance with their terms, except as may be limited by
                    bankruptcy, insolvency, reorganization and other similar
                    laws of general applicability relating to or affecting
                    creditors' rights and general equity principles, whether
                    applied by a court of law or equity; the SAILS conform in
                    all material respects to the statements relating thereto
                    contained in each Company Registration Statement and the
                    Company Prospectus;

             (iv)   No consent, approval, authorization or order of, or filing
                    with, any governmental agency or body or any court
<PAGE>
 
                                                                              37

                    is required for the consummation by the Company of the
                    transactions contemplated by this Agreement in connection
                    with the issuance or sale of the SAILS by the Company,
                    except such as may be required under the Act, the Rules and
                    Regulations, the Exchange Act, the Exchange Act Rules and
                    Regulations, the Trust Indenture Act or under state or local
                    securities laws, rules and regulations;

              (v)   The execution, delivery and performance of this Agreement
                    and the consummation by the Company of the transactions
                    herein contemplated will not result in a breach or violation
                    of any of the terms and provisions of, or constitute a
                    default under, any statute, rule, regulation or order known
                    to such counsel of any governmental agency or body or any
                    court having jurisdiction over the Company or any Company
                    Significant Subsidiary or any of their respective
                    properties, or any agreement or instrument known to such
                    counsel to which the Company or any Company Significant
                    Subsidiary is a party or by which the Company or any Company
                    Significant Subsidiary is bound, or to which any of the
                    properties of the Company or any Company Significant
                    Subsidiary is subject, or the charter or bylaws of the
                    Company or any Company Significant Subsidiary, and the
                    Company has full corporate power and authority to authorize,
                    issue and sell the SAILS as contemplated by this Agreement;

             (vi)   The Company Registration Statements have become effective
                    under the Act and, to the best of such counsel's knowledge,
                    no stop order suspending the effectiveness of a Company
                    Registration Statement or any part thereof has been issued
                    and no proceedings for that purpose have been instituted or
                    are pending or contemplated under the Act; and each Company
                    Registration Statement and the Company Prospectus, and each
                    amendment or supplement thereto, as of their respective
                    effective or issue dates, or at such Closing Date, as the
                    case may be, complied as to form in all material
<PAGE>
 
                                                                              38

                    respects with the requirements of the Act, the Rules and
                    Regulations and the Trust Indenture Act (except that such
                    counsel need express no opinion as to the financial
                    statements and related schedules and the other financial
                    data contained or incorporated by reference therein or as to
                    the Statement of Eligibility and Qualification under the
                    Trust Indenture Act on Form T-1 of the Trustee (the "T-1"));

               In addition, James M. Neville shall state that he has no reason
     to believe that either a Company Registration Statement or the Company
     Prospectus, or any amendment or supplement thereto, as of their respective
     dates or as of such Closing Date, contained any untrue statement of a
     material fact or omitted to state any material fact required to be stated
     therein or necessary to make the statements therein not misleading; and
     James M. Neville does not know of any legal or governmental proceedings
     required to be described in the Company Registration Statements or the
     Company Prospectus which are not described as required, or of any contracts
     or documents of a character required to be described in the Company
     Registration Statements or in any document incorporated by reference
     therein or in the Company Prospectus, or to be filed as exhibits to the
     Company Registration Statements which are not described and filed as
     required, it being understood that he need express no opinion as to the T-1
     or the financial statements and related schedules or other financial data
     contained in the Company Registration Statements or the Company Prospectus.

          (h) The Underwriters shall have received from Underwriters' Counsel
     such opinion or opinions with respect to the incorporation of IBC and the
     Company, the validity of the Firm SAILS or the Option SAILS, as the case
     may be, the IBC Registration Statements, the Company Registration
     Statements, the IBC Prospectus, the Company Prospectus and other related
     matters as the Underwriters may require, and the Company and IBC shall have
     furnished to such counsel such documents as they request for the purpose of
     enabling them to pass upon such matters.  In rendering such opinion,
     Underwriters' Counsel may rely as to matters of Missouri law on the opinion
     of James Neville.

          (i) The Underwriters shall have received a certificate, dated such
     Closing Date, of the President and Chief Operating Officer and the Vice
     President and Treasurer of IBC to the effect that, and the Underwriters
     shall be otherwise satisfied that:  (i)
<PAGE>
 
                                                                              39

     the representations and warranties of IBC in this Agreement are true and
     correct as if made on and as of such Closing Date; (ii) IBC has complied
     with all the agreements and satisfied all the conditions on its part to be
     performed or satisfied at or prior to such Closing Date; (iii) to their
     knowledge no stop order suspending the effectiveness of the IBC
     Registration Statements has been issued and no proceedings for that purpose
     have been instituted or are contemplated by the Commission; and (iv) that
     subsequent to the date of the most recent financial statements in the IBC
     Prospectus,  there has been no material adverse change, nor any development
     or event involving a prospective material adverse change, which has had or
     could have an IBC Material Adverse Effect except as set forth in or
     contemplated by the IBC Prospectus or described in such certificate.

          (j) The Underwriters shall have received a certificate, dated such
     Closing Date, of the Vice President and Chief Financial Officer and the
     Treasurer of the Company to the effect that, and the Underwriters shall be
     otherwise satisfied that:  (i) the representations and warranties of the
     Company in this Agreement are true and correct as if made on and as of such
     Closing Date; (ii) the Company has complied with all the agreements and
     satisfied all the conditions on its part to be performed or satisfied at or
     prior to such Closing Date; (iii) to their knowledge that no stop order
     suspending the effectiveness of the Company Registration Statements has
     been issued and no proceedings for that purpose have been instituted or are
     contemplated by the Commission; and (iv) that subsequent to the date of the
     most recent financial statements in the Company Prospectus, there has been
     no material adverse change, nor any development or event involving a
     prospective material adverse change, which has had or could have a Company
     Material Adverse Effect except as set forth in or contemplated by the
     Company Prospectus or described in such certificate.

          (k) The Underwriters shall have received letters, dated such Closing
     Date, of Deloitte & Touche LLP and Price Waterhouse LLP which meet the
     requirements of Sections 9(a) and 9(b) hereof, except that the specified
     dates referred to in Sections 9(a) and 9(b) hereof will be a date not more
     than three business days prior to the Closing Date for the purposes of this
     Section 9(k).

          IBC and the Company will furnish the Underwriters with such conformed
copies of such opinions, certificates, letters and documents as the Underwriters
reasonably request.  CSFBC may in its sole discretion waive on behalf of the
Underwriters
<PAGE>
 
                                                                              40

compliance with any conditions to the obligations of the Underwriters hereunder,
whether in respect of the First Closing Date, an Option Closing Date or
otherwise.

          10.  Indemnification and Contribution.
               -------------------------------- 

          (a) IBC will indemnify and hold harmless each Underwriter and the
     Company against any losses, claims, damages or liabilities, joint or
     several, to which such Underwriter or the Company, as the case may be, may
     become subject, under the Act or otherwise, insofar as such losses, claims,
     damages or liabilities (or actions in respect thereof) arise out of or are
     based upon any breach of any representation, warranty, agreement or
     covenant of IBC herein contained or any untrue statement or alleged untrue
     statement of a material fact contained in the IBC Information, the IBC
     Registration Statements, any Preliminary IBC Prospectus, the IBC Prospectus
     or any amendment or supplement thereto, or arise out of or are based upon
     the omission or alleged omission to state therein a material fact required
     to be stated therein or necessary to make the statements therein not
     misleading, and will reimburse each Underwriter or the Company for any
     legal or other expenses reasonably incurred by them in connection with
     investigating or defending any such loss, claim, damage, liability or
     action as such expenses are incurred; provided, however, that IBC shall not
     be liable in any such case (i) to any Underwriter or the Company to the
     extent that any such loss, claim, damage or liability arises out of or is
     based upon an untrue statement or alleged untrue statement or omission or
     alleged omission made in any of such documents in reliance upon and in
     conformity with written information furnished to IBC by or on behalf of any
     Underwriter or the Company specifically for use therein, unless such loss,
     claim, damage or liability arises out of the offer or sale of SAILS
     occurring after any Underwriter or the Company, as the case may be, has
     notified IBC in writing that such information should no longer be used
     therein, it being understood and agreed that the only such information
     furnished by any Underwriter consists of the information described in
     subsection (h) below and that the only such information provided by the
     Company consists of information described in subsection (j) below or (ii)
     to any Underwriter if (A) any such loss, claim, damage or liability arises
     out of or is based upon an untrue statement or alleged untrue statement or
     omission or alleged omission made in any of such documents, (B) such untrue
     statement or alleged untrue statement or omission or alleged omission is
     corrected in any amendment or supplement to the IBC Registration Statement
     or the IBC Prospectus, (C) IBC shall have
<PAGE>
 
                                                                              41

     performed each of its obligations under Section 6 in respect of such
     amendment or supplement and (D) to the extent that a prospectus relating to
     such SAILS was required to be delivered by such Underwriter under the Act,
     such Underwriter, having been furnished by or on behalf of IBC with copies
     of the IBC Prospectus as so amended or supplemented, thereafter fails to
     deliver such amended or supplemented IBC Prospectus prior to or
     concurrently with the sale of SAILS to the person asserting such loss,
     claim, damage, or liability who purchased such SAILS from such Underwriter.
     The indemnification provided for in this Section 10(a) shall be in addition
     to any liabilities which IBC may otherwise have and shall extend upon the
     same terms and conditions to, and shall inure to the benefit of, each
     person, if any, who controls any Underwriter or the Company within the
     meaning of the Act.

          (b) The Company will indemnify and hold harmless each Underwriter and
     IBC, against any losses, claims, damages or liabilities, joint or several,
     to which such Underwriter or IBC, as the case may be, may become subject,
     under the Act or otherwise, insofar as such losses, claims, damages or
     liabilities (or actions in respect thereof) arise out of or are based upon
     any untrue statement or alleged untrue statement of any material fact
     contained in the Company Information, the Company Registration Statements,
     the Company Prospectus or any amendment or supplement thereto, or any
     Preliminary Company Prospectus, or arise out of or are based upon the
     omission or alleged omission to state therein a material fact required to
     be stated therein or necessary to make the statements therein not
     misleading, and will reimburse each Underwriter or IBC for any legal or
     other expenses reasonably incurred by them in connection with investigating
     or defending any such loss, claim, damage, liability or action as such
     expenses are incurred; provided, however, that the Company will not be
     liable in any such case (i) to any Underwriter or IBC to the extent that
     any such loss, claim, damage or liability arises out of or is based upon an
     untrue statement or alleged untrue statement or omission or alleged
     omission made in any of such documents in reliance upon and in conformity
     with written information furnished to the Company by or on behalf of any
     Underwriter or IBC specifically for use therein, unless such loss, claim,
     damage or liability arises out of the offer or sale of SAILS occurring
     after the Underwriter or IBC, as the case may be, has notified the Company
     in writing that such information should no longer be used therein, it being
     understood and agreed that the only such information furnished by any
     Underwriter consists of the information described in subsection (i) below
     and that the only such
<PAGE>
 
                                                                              42

     information provided by IBC consists of information described in subsection
     (k) below or (ii) to any Underwriter if (A) any such loss, claim, damage or
     liability arises out of or is based upon an untrue statement or alleged
     untrue statement or omission or alleged omission made in any of such
     documents, (B) such untrue statement or alleged untrue statement or
     omission or alleged omission is corrected in any amendment or supplement to
     the Company Registration Statement or the Company Prospectus, (C) the
     Company shall have performed each of its obligations under Section 6 in
     respect of such amendment or supplement and (D) to the extent that a
     prospectus relating to such SAILS was required to be delivered by such
     Underwriter under the Act, such Underwriter, having been furnished by or on
     behalf of the Company with copies of the Company Prospectus as so amended
     or supplemented, thereafter fails to deliver such amended or supplemented
     Company Prospectus prior to or concurrently with the sale of SAILS to the
     person asserting such loss, claim, damage, or liability who purchased such
     SAILS from such Underwriter.  The indemnification provided for in this
     Section 10(b) shall be in addition to any liabilities which the Company may
     otherwise have and shall extend upon the same terms and conditions to, and
     inure to the benefit of, each person, if any, who controls any Underwriter
     or IBC within the meaning of the Act.

          (c) Each Underwriter, severally and not jointly, agrees to indemnify
     and hold harmless IBC against any losses, claims, damages or liabilities to
     which IBC may also become subject, under the Act or otherwise, insofar as
     such losses, claims, damages or liabilities (or actions in respect thereof)
     arise out of or are based upon any untrue statement or alleged untrue
     statement of any material fact contained in the Company Registration
     Statements, the IBC Registration Statements, the Company Prospectus, the
     IBC Prospectus or any amendment or supplement thereto, or any Preliminary
     Company Prospectuses or Preliminary IBC Prospectuses, or arise out of or
     are based upon the omission or the alleged omission to state therein a
     material fact required to be stated therein or necessary to make the
     statements therein not misleading, in each case to the extent, but only to
     the extent, that such untrue statement or alleged untrue statement or
     omission or alleged omission was made in reliance upon and in conformity
     with written information furnished to IBC by such Underwriter through CSFBC
     specifically for use therein, and will reimburse IBC for any legal or other
     expenses reasonably incurred by IBC in connection with investigating or
     defending any such loss, claim,
<PAGE>
 
                                                                              43

     damage, liability or action as such expenses are incurred, it being
     understood and agreed that the only such information furnished by any
     Underwriter consists of the information described in subsection (h) below.
     The indemnification provided for in this Section 10(c) shall be in addition
     to any liabilities which the Underwriters may otherwise have and shall
     extend upon the same terms and conditions to, and shall inure to the
     benefit of, each officer and director of IBC and each person, if any, who
     controls IBC within the meaning of the Act.

          (d) Each Underwriter, severally and not jointly, agrees to indemnify
     and hold harmless the Company against any losses, claims, damages or
     liabilities to which the Company may become subject, under the Act or
     otherwise, insofar as such losses, claims, damages or liabilities (or
     actions in respect thereof) arise out of or are based upon any untrue
     statement or alleged untrue statement of any material fact contained in the
     Company Registration Statements, the IBC Registration Statements, the
     Company Prospectus, the IBC Prospectus or any amendment or supplement
     thereto, or any Preliminary Company Prospectuses or Preliminary IBC
     Prospectuses, or arise out of or are based upon the omission to state
     therein a material fact required to be stated therein or necessary to make
     the statements therein not misleading, in each case to the extent, but only
     to the extent, that such untrue statement or alleged untrue statement or
     omission or alleged omission was made in reliance upon and in conformity
     with written information furnished to the Company by such Underwriter
     through CSFBC specifically for use therein, and will reimburse the Company
     for any legal or other expenses reasonably incurred by the Company in
     connection with investigating or defending any such loss, claim, damage,
     liability or action as such expenses are incurred, it being understood and
     agreed that the only such information furnished by any Underwriter consists
     of the information described in subsection (i) below.  The indemnification
     provided for in this Section 10(d) shall be in addition to any liabilities
     which the Underwriters may otherwise have and shall extend upon the same
     terms and conditions to, and shall inure to the benefit of, each officer
     and director of the Company and each person, if any, who controls the
     Company within the meaning of the Act.

          (e) Promptly after receipt by an indemnified party under this Section
     10 of notice of the commencement of any action, such indemnified party
     will, if a claim in respect thereof is to be made against the indemnifying
     party under subsection (a), (b), (c) or (d) above, notify the indemnifying
     party of
<PAGE>
 
                                                                              44

     the commencement thereof; but the omission so to notify the indemnifying
     party will not relieve it from any liability which it may have to any
     indemnified party under subsection (a), (b), (c) or (d) above except to the
     extent that the indemnifying party is actually prejudiced by such failure
     to give notice.  In case any such action is brought against any indemnified
     party and it notifies the indemnifying party of the commencement thereof,
     the indemnifying party will be entitled to participate therein and, to the
     extent that it may wish, jointly with any other indemnifying party
     similarly notified, to assume the defense thereof, with counsel
     satisfactory to such indemnified party (who shall not, except with the
     consent of the indemnified party, which consent shall not unreasonably be
     withheld, be counsel to the indemnifying party), and after notice from the
     indemnifying party to such indemnified party of its election so to assume
     the defense thereof, the indemnifying party will not be liable to such
     indemnified party under this Section 10(e) for any legal expenses
     subsequently incurred by such indemnified party in connection with the
     defense thereof, other than reasonable costs of investigation.  An
     indemnifying party shall not be liable for any amounts paid in settlement
     of any action or claim without its written consent, which shall not be
     unreasonably withheld.

          (f) No indemnifying party shall, without the prior written consent of
     the indemnified party, effect any settlement of any pending or threatened
     action in respect of which any indemnified party is or could have been a
     party and indemnity could have been sought hereunder by such indemnified
     party unless such settlement includes an unconditional release of such
     indemnified party from all liability on any claims that are the subject
     matter of such action.

          (g) If the indemnification provided for in this Section 10 is
     unavailable or insufficient to hold harmless an indemnified party under
     subsection (a), (b), (c) or (d) above, then each indemnifying party shall
     contribute to the amount paid or payable by such indemnified party as a
     result of the losses, claims, damages or liabilities referred to in
     subsection (a), (b), (c) or (d) above (i) in such proportion as is
     appropriate to reflect the relative benefits received by the Company or
     IBC, as applicable, on the one hand, and the Underwriters, on the other
     hand, from the offering of the SAILS or (ii) if the allocation provided by
     clause (i) above is not permitted by applicable law, in such proportion as
     is appropriate to reflect not only the relative benefits referred to in
     clause (i) above but also the relative fault of the
<PAGE>
 
                                                                              45

     Company or IBC, as applicable, on the one hand, and the Underwriters, on
     the other hand, in connection with the statements or omissions which
     resulted in such losses, claims, damages or liabilities as well as any
     other relevant equitable considerations.  The relative benefits received by
     the Company or IBC, as applicable, on the one hand, and the Underwriters,
     on the other hand, shall be deemed to be in the same proportion as the
     total net proceeds from the offering (before deducting expenses) received
     (directly or indirectly) by the Company, bears to the total underwriting
     discounts and commissions received by the Underwriters.  The relative fault
     shall be determined by reference to, among other things, whether the untrue
     or alleged untrue statement of a material fact or the omission or alleged
     omission to state a material fact relates to information supplied by the
     Company, IBC or the Underwriters and the parties' relative intent,
     knowledge, access to information and opportunity to correct or prevent such
     untrue statement or omission.  The amount paid by an indemnified party as a
     result of the losses, claims, damages or liabilities referred to in the
     first sentence of this Section 10(g) shall be deemed to include any legal
     or other expenses reasonably incurred by such indemnified party in
     connection with investigating or defending any action or claim which is the
     subject of this Section 10(g).  Notwithstanding the provisions of this
     Section 10(g), no Underwriter shall be required to contribute any amount in
     excess of the amount by which the total price at which the SAILS
     underwritten by it and distributed to the public were offered to the public
     exceeds the amount of any damages which such Underwriter has otherwise been
     required to pay by reason of such untrue or alleged untrue statement or
     omission.  No person guilty of fraudulent misrepresentation (within the
     meaning of Section 11(f) of the Act) shall be entitled to contribution from
     any person who was not guilty of such fraudulent misrepresentation.  The
     Underwriters' obligations in this Section 10(g) to contribute are several
     in proportion to their respective underwriting obligations and not joint.

          (h) The Underwriters confirm that the only information furnished by
     any Underwriter for the IBC Prospectus consists of the legend concerning
     over allotments and stabilization on the inside front cover page, and the
     concession and reallowance figures appearing in the fourth paragraph under
     the caption "Underwriting", and the information contained in the sixth
     paragraph under the caption "Underwriting".

          (i) The Underwriters confirm that the only information furnished by
     any Underwriter for the
<PAGE>
 
                                                                              46

     Company Prospectus consists of the last paragraph at the bottom of the
     cover page concerning the terms of the offering by the Underwriters, the
     legend concerning over-allotments and on the inside front cover page, and
     the concession and reallowance figures appearing in the fourth paragraph
     under the caption "Underwriting" and the information contained in the
     seventh paragraph under the caption "Underwriting".

          (j) The Company confirms that the statements with respect to the terms
     of the SAILS set forth on the cover page of any Preliminary IBC Prospectus
     and in the final form of IBC Prospectus filed pursuant to Rule 424(b) (the
     "Company Information") constitute the only information furnished in writing
     to IBC by the Company specifically for inclusion in any Preliminary IBC
     Prospectus, the IBC Prospectus or the IBC Registration Statement.

          (k) IBC confirms that the information set forth under "Interstate
     Bakeries Corporation" in any Preliminary Company Prospectus and in the
     final form of Company Prospectus filed pursuant to Rule 424(b) (the "IBC
     Information") constitutes the only information furnished in writing to the
     Company by IBC specifically for inclusion in any Preliminary Company
     Prospectus, the Company Prospectus or the Company Registration Statement.

          (l) The agreement contained in this Section 10 and the
     representations, warranties and agreements of IBC in Section 2 and 6, and
     of the Company in Sections 3 and 7, shall survive the delivery of the SAILS
     and shall remain in full force and effect, regardless of any termination or
     cancellation of this Agreement or any investigation made by or on behalf of
     any indemnified party.

          11.  Definition of the Terms "Business Day" and "Subsidiary".  For
               -------------------------------------------------------      
purposes of this Agreement, (a) "business day" means any day on which commercial
banks in The City of New York are open for business and (b) "subsidiary" has the
meaning set forth in Rule 405 of the Rules and Regulations.

          12.  Default of Underwriters.  If any Underwriter defaults in its
               -----------------------                                     
obligations to purchase SAILS hereunder on either the First Closing Date or any
Option Closing Date and the aggregate number of SAILS that such defaulting
Underwriters agreed but failed to purchase does not exceed 10% of the total
number of SAILS that the Underwriters are obligated to purchase on such Closing
Date, CSFBC may make arrangements satisfactory to the Company for the purchase
of such SAILS by other persons, including the non-defaulting Underwriter, but if
no such arrangements are made by such Closing Date, the non-defaulting
<PAGE>
 
                                                                              47

Underwriter shall be obligated to purchase the SAILS that such defaulting
Underwriter agreed but failed to purchase on such Closing Date.  If any
Underwriter so defaults and the aggregate number of SAILS with respect to which
such default occurs exceeds 10% of the total number of SAILS that the
Underwriters are obligated to purchase on such Closing Date and arrangements
satisfactory to CSFBC and the Company for the purchase of such SAILS by other
persons are not made within 36 hours after such default, this Agreement will
terminate without liability on the part of the non-defaulting Underwriter or the
Company or IBC, except as provided in Section 13 (provided that if such default
occurs with respect to Option SAILS after the First Closing Date, this Agreement
will not terminate as to the Firm SAILS or any Option SAILS purchased prior to
such termination).  As used in this Agreement, the term "Underwriter" includes
any person substituted for an Underwriter under this Section 12.  Nothing herein
will relieve a defaulting Underwriter from liability for its default.

          13.  Survival of Certain Representations and Obligations.  The
               ---------------------------------------------------      
respective indemnities, agreements, representations, warranties and other
statements of the Company and IBC or their respective officers and of the
several Underwriters set forth in or made pursuant to this Agreement will remain
in full force and effect, regardless of any investigation or statement as to the
results thereof, made by or on behalf of the Company or IBC or any Underwriter
or any of their respective representatives, officers or directors or any
controlling person, and will survive delivery of and payment for the SAILS.  If
this Agreement is terminated pursuant to Section 12 or if for any reason the
purchase of the SAILS by the Underwriters is not consummated, the Company shall
remain responsible for the expenses to be paid or reimbursed by it pursuant to
Section 8 and the respective obligations of the Company and IBC and the
Underwriters pursuant to Section 10 shall remain in effect, and if any SAILS
have been purchased hereunder the representations and warranties in Section 2
and 3, and all obligations under Sections 6 and 7 shall also remain in effect.
If the purchase of the SAILS by the Underwriters is not consummated for any
reason other than solely because of the termination of this Agreement pursuant
to Section 12 or the occurrence of any event specified in clauses (iii), (iv) or
(v) of Section 9(e) hereof, the Company will reimburse the Underwriters for all
out-of-pocket expenses (including fees, charges and disbursements of counsel)
reasonably incurred by them in connection with the offering of the SAILS.

          14.  Notices.  All communications hereunder will be in writing and, if
               -------                                                          
sent to the Underwriters, will be mailed, delivered, telecopied or facsimile and
confirmed to the Underwriters, c/o Credit Suisse First Boston Corporation,
Eleven Madison Avenue, New York, New York 10010-3629, Attention:  Investment
Banking Department - Transactions Advisory Group, or, if sent to IBC, will be
mailed, delivered or telecopied and confirmed to it at Interstate Bakeries
Corporation, 12 East
<PAGE>
 
                                                                              48

Armour Boulevard, Kansas City, Missouri 64111, Attention:  Ray Sandy Sutton; or,
if sent to the Company, will be mailed, delivered, telecopied or telegraphed and
confirmed to it at Ralston Purina Company, Checkerboard Square, St. Louis,
Missouri 63164, Attention:  General Counsel.

          15.  Representation of Underwriters.  The Representatives will act for
               ------------------------------                                   
the several Underwriters in connection with this financing, and any action under
this Agreement taken by the Representatives jointly or by CSFBC will be binding
upon all of the Underwriters.

          16.  Successors.  This Agreement will inure to the benefit of and be
               ----------                                                     
binding upon the parties hereto and their respective successors and the officers
and directors and controlling persons referred to in Section 10, and no other
person will have any right or obligation hereunder.

          17.  Counterparts.  This Agreement may be executed in one or more
               ------------                                                
counterparts and, if executed in more than one counterpart, the executed
counterparts shall each be deemed to be an original but all such counterparts
shall together constitute one and the same instrument.

          18.  Headings.  The 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.

          19.  Applicable Law.  This Agreement shall be governed by and
               --------------                                          
construed in accordance with the laws of the State of New York, without regard
to principles of conflicts of laws.

          The Company and IBC hereby submit to the non-exclusive jurisdiction of
the Federal and state courts in the Borough of Manhattan in The City of New York
in any suit or proceeding arising out of or relating to this Agreement or the
transactions contemplated hereby.
<PAGE>
 
                                                                              49

          If the foregoing is in accordance with your understanding of our
agreement, kindly sign and return to us one of the counterparts hereof whereupon
it will become a binding agreement among the Company, IBC and the Underwriters
in accordance with its terms.


                                 Very truly yours,

                                 RALSTON PURINA COMPANY


                                 By:___________________________
                                     Name:
                                     Title:


                                 INTERSTATE BAKERIES CORPORATION


                                 By:___________________________
                                     Name:
                                     Title:


The foregoing Underwriting
Agreement is hereby confirmed
and accepted as of the date
first above written.

CREDIT SUISSE FIRST BOSTON CORPORATION
BEAR, STEARNS & CO. INC.
LEHMAN BROTHERS INC.
J.P. MORGAN SECURITIES INC.
SALOMON BROTHERS INC

Acting on behalf of
themselves and the
several Underwriters.


By:  CREDIT SUISSE FIRST BOSTON CORPORATION


     By:_______________________
        Name:
        Title:
<PAGE>
 
                                                                              50

                                  SCHEDULE A
 
 
UNDERWRITER                               NUMBER OF
                                            SAILS
                                          ---------
 
Credit Suisse First Boston Corporation..    992,934
Bear, Stearns & Co. Inc.................    992,932
Lehman Brothers Inc.....................    992,932
J.P. Morgan Securities Inc..............    992,932
Salomon Brothers Inc....................    992,932
George K. Baum & Company................    302,723
Sanford C. Bernstein & Co., Inc.........    302,723
A.G. Edwards & Sons, Inc................    302,723
Janney Montgomery Scott Inc.............    302,723
Prudential Securities Incorporated......    302,723
The Robinson-Humphrey Company, Inc......    302,723
                                          ---------
     Total..............................  6,781,000
                                          =========
 

<PAGE>
 
                                                                    EXHIBIT 4(b)
 
                         RALSTON PURINA COMPANY, Issuer
                                      AND
                  THE FIRST NATIONAL BANK OF CHICAGO, Trustee



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



                          FIRST SUPPLEMENTAL INDENTURE
                           Dated as of July 29, 1997



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



               Supplemental to Indenture dated as of May 26, 1995



                                        

                                        
<PAGE>
 
                               TABLE OF CONTENTS
                               -----------------


                                                             Page
                                                             ----
                                  ARTICLE I.

            CERTAIN PROVISIONS OF GENERAL APPLICATION......... 2

        Section 1.01    Definitions........................... 2
        Section 1.02    Effect of Headings.................... 5
        Section 1.03    Successors and Assigns................ 6
        Section 1.04    Separability.......................... 6
        Section 1.05    Conflict with Trust Indenture Act..... 6
        Section 1.06    Benefits of Supplemental Indenture.... 6
        Section 1.07    Application of Supplemental
                            Indenture......................... 6
        Section 1.08    Governing Law......................... 6

                                  ARTICLE II.
                                   THE SAILS.................. 6

        Section 2.01    Title and Terms....................... 6
        Section 2.02    Exchange at Maturity.................. 7
        Section 2.03    No Fractional Shares.................. 8
        Section 2.04    Adjustment of Exchange Rate........... 8
        Section 2.05    Notice of Adjustments and Certain
                        other Events..........................13
        Section 2.06    Taxes.................................15
        Section 2.07    Delivery of Securities upon Maturity..16

                                 ARTICLE III.

                                   COVENANTS..................16

        Section 3.01    Shares Free and Clear.................16
        Section 3.02    Discharge of Indenture................16

                                  ARTICLE IV.

                                 MISCELLANEOUS................17

        Section 4.01    Confirmation of Indenture.............17
        Section 4.02    Concerning the Trustee................17


                                      -i-
<PAGE>
 
    This First Supplemental Indenture (the "Supplemental Indenture") is made
                                            ----------------------          
and entered into as of July 29, 1997 between Ralston Purina Company, a Missouri
corporation (the "Company" or "Issuer"), and The First National Bank of Chicago
                  -------      ------                                          
(the "Trustee"), as Trustee under the Indenture dated as of May 26, 1995 (the
      -------                                                                
"Indenture").
- ----------   

     WHEREAS, the parties hereto previously entered into the Indenture to
provide for the issuance of one or more series of debt securities (the
"Securities"); and
- -----------       

     WHEREAS, Section 8.1 of the Indenture provides that the Company, when
authorized by its Board of Directors, and the Trustee, may from time to time and
at any time enter into an indenture or indentures supplemental to the Indenture,
without the consent of any Holder of Securities, among other things, to
establish the form and terms of new Securities of any series; and

     WHEREAS, the Company has duly authorized the creation of a series of its
Securities denominated its "7% Exchangeable Notes Due 2000" representing up to
7,749,000 of its "Stock Appreciation Income Linked Securities/SM/" (such
Securities being referred to herein as the "SAILS/SM/"), the principal amount of
                                            ---------                           
which is mandatorily exchangeable at maturity into Common Stock par value $.01
per share (the "IBC Common Stock"), of Interstate Bakeries Corporation, a
                ----------------                                         
Delaware corporation ("IBC"), or, at the option of the Company under certain
                       ---                                                  
circumstances, cash, in either case at the Exchange Rate (as defined herein),
and/or other securities or cash as described herein; and

     WHEREAS, the entry into this Supplemental Indenture by the parties hereto
is in all respects authorized by the provisions of the Indenture; and

     WHEREAS the Company has duly authorized the execution and delivery of this
Supplemental Indenture, and all things necessary have been done to make the
SAILS, when executed by the Company and authenticated and delivered hereunder
and duly issued by the Company, the valid obligations of the Company, and to
make this Supplemental Indenture a valid agreement of the Company, in accordance
with their and its terms.

     NOW, THEREFORE:

     For and in consideration of the premises and purchase of the SAILS by the
holders thereof, it is mutually covenanted and agreed, for the equal and
proportionate benefit of all holders of the Securities of such series, as
follows:
<PAGE>
 
                                                                               2


                                  ARTICLE I.

                   CERTAIN PROVISIONS OF GENERAL APPLICATION

          Section 1.01  Definitions.
                        ----------- 

          For all purposes of the Indenture and this Supplemental Indenture,
except as otherwise expressly provided or unless the context otherwise requires:

          (1)  the terms defined in this Article have the meanings assigned to
them in this Article;

          (2)  the words "herein", "hereof" and "hereunder" and other words of
                          ------    ------       ---------                    
similar import refer to the Indenture and this Supplemental Indenture as a whole
and not to any particular Article, Section or other subdivision; and

          (3)  capitalized terms used herein but not defined herein are used
herein as they are defined in the Indenture.

          "Adjustment Event" means (i) any dividend or distribution by IBC to
           ----------------                                                  
all holders of IBC Common Stock of evidences of its indebtedness or other assets
(other than (1) dividends or distributions referred to in Section 2.04(a)(i)(A)
hereof, (2) any common shares issued pursuant to a reclassification referred to
in Section 2.04(a)(i)(D) hereof and (3) any Ordinary Cash Dividends) or any
issuance by IBC to all holders of IBC Common Stock of rights or warrants (other
than rights or warrants for which adjustment is then required pursuant to
Section 2.04(a)(ii) hereof or for which an adjustment may be later required as
set forth in Section 2.04(a)(iii) hereof), (ii) any consolidation or merger of
IBC with or into another entity (other than a merger or consolidation in which
IBC is the continuing corporation and in which the shares of IBC Common Stock
outstanding immediately prior to the merger or consolidation are not exchanged
for cash, securities or other property of IBC or another corporation), (iii) any
sale, transfer, lease or conveyance to another corporation of the property of
IBC as an entirety or substantially as an entirety, (iv) any statutory exchange
of securities of IBC with another corporation (other than in connection with a
merger or acquisition) or (v) any liquidation, dissolution or winding up of IBC.

          "Business Day" means, solely for the purposes of this Supplemental
           ------------                                                     
Indenture, any day that is not a Saturday, a Sunday or a day on which the NYSE
or banking institutions or trust companies in The City of New York are
authorized or obligated by law or executive order to close.

          "Closing Price" of any security on any date of determination means (a)
           -------------                                                        
the closing sale price (or, if no closing sale price is reported, the last
reported sale price) of such
<PAGE>
 
                                                                               3

security (regular way) on the NYSE on such date, (b) if such security is not
listed for trading on the NYSE on any such date, as reported in the composite
transactions for the principal United States securities exchange on which such
security is so listed, (c) if such security is not so listed on a United States
national or regional securities exchange, as reported by the NASDAQ Stock
Market, (d) if such security is not so reported, the last quoted bid price for
such security in the over-the-counter market as reported by the National
Quotation Bureau or similar organization or (e) if such security is not so
quoted, the average of the mid-point of the last bid and ask prices for such
security from each of at least three nationally recognized investment banking
firms selected by the Company for such purpose.

          "Dilution Event" has the meaning set forth in Section 2.04(a).
           --------------                              

          "Exchange Rate" means a rate, determined by the Company and notified
           -------------                                                      
to the Trustee, equal to (a) if the Maturity Price is greater than or equal to
$75.5638 (the "Threshold Appreciation Price"), 0.8197 of a share of IBC Common
               ----------------------------                                   
Stock per SAILS, (b) if the Maturity Price is less than the Threshold
Appreciation Price but is greater than the Initial Price, (i) a fraction equal
to the Initial Price divided by the Maturity Price of (ii) one share of IBC
Common Stock per SAILS (such fractional share being calculated to the nearest
1/10,000th of a share or, if there is not a nearest 1/10,000th of a share, to
the next lower 1/10,000th of a share) and (c) if the Maturity Price is less than
or equal to the Initial Price, one share of IBC Common Stock per SAILS;
provided, however, that the Exchange Rate is subject to adjustment from time to
time pursuant to Section 2.04.

          "IBC Common Stock" has the meaning set forth in the recitals to this
           ----------------                                                   
Supplemental Indenture and includes any other common stock of IBC issued in a
reclassification of any shares of such IBC Common Stock.

          "Initial Price" means $61.9375 per share of IBC Common Stock.
           -------------                                 

          "Market Price" means, as of any date of determination, the average
           ------------                                                     
Closing Price per share of IBC Common Stock for the 20 Trading Days immediately
prior to the date of determination; provided, however, that if there are not 20
Trading Days for the IBC Common Stock occurring later than the 60th calendar day
immediately prior to, but not including, such date, the Market Price shall be
determined as the market value per share of IBC Common Stock as of such date as
determined by a nationally recognized investment banking firm retained for such
purpose by the Company.
<PAGE>
 
                                                                               4

          "Maturity" means the date of Stated Maturity or such earlier date as
           --------                                                           
the SAILS may become due in accordance with the provisions hereof.

          "Maturity Price" means the average Closing Price per share of IBC
           --------------                                                  
Common Stock for the 20 Trading Days immediately prior to, but not including,
the date of Maturity, which price shall be determined by the Company and
notified to the Trustee; provided, however, that if there are not 20 Trading
Days for the IBC Common Stock occurring later than the 60th calendar day
immediately prior to, but not including, the date of Maturity, Maturity Price
means the market value per share of IBC Common Stock as of the date of Maturity
as determined by a nationally recognized investment banking firm retained for
such purpose by the Company; provided, further, that the Maturity Price is
subject to adjustment from time to time as set forth in the last paragraph of
Section 2.04(a) and Section 2.04(b)(2).

          "NYSE" means the New York Stock Exchange, Inc.
           ----                                         

          "Ordinary Cash Dividend" has the meaning set forth in Section 
           ----------------------                     
           2.04(b)(5).

          "Reported Securities" means securities received in an Adjustment Event
           -------------------                                                  
(A) (i) that are listed on a United States national securities exchange, (ii)
that are reported on a United States national securities system subject to last
sale reporting, (iii) that are traded in the over-the-counter market and
reported on the National Quotation Bureau or similar organization or (iv) for
which bid and ask prices are available from at least three nationally recognized
investment banking firms and (B) that are either (x) perpetual equity securities
or (y) non-perpetual equity securities or debt securities with a stated maturity
after the Stated Maturity of the SAILS.

          "SAILS" has the meaning set forth in the recitals to this 
           -----
Supplemental Indenture.

          "Share Components" means the ratios of shares of IBC Common Stock per
           ----------------                                                    
SAILS specified in clauses (a), (b) (ii) and (c) of the definition of "Exchange
                                                                       --------
Rate" set forth in this Article.
- ----                            

          "Stated Maturity" has the meaning set forth in Section 2.01.
           ---------------                              

          "Threshold Appreciation Price" has the meaning specified in the
           ----------------------------                                  
definition of "Exchange Rate" set forth in this Article.
               -------------                            

          "Trading Day" means a Business Day on which the security, the Closing
           -----------                                                         
Price of which is being determined, (a) is not suspended from trading on any
national or regional securities exchange or association or over-the-counter
market at the close of business and (b) has traded at least once on the national
or
<PAGE>
 
                                                                               5

regional securities exchange or association or over-the-counter market that is
the primary market for the trading of such security.

          "Transaction Value" means (a) for any cash received in any Adjustment
           -----------------                                                   
Event, the amount of cash received per share of IBC Common Stock, (b) for any
Reported Securities received in any Adjustment Event, an amount equal to (x) the
Market Price of such Reported Securities for the 20 Trading Days immediately
prior to Maturity multiplied by (y) the number of such Reported Securities (as
adjusted pursuant to Section 2.04(b)(4)) received per share of IBC Common Stock
and (c) for any property received in any Adjustment Event other than cash or
such Reported Securities, an amount equal to the fair market value of the
property received per share of IBC Common Stock on the date such property is
received, as determined by a nationally recognized investment banking firm
retained for this purpose by the Company; provided, however, that in the case of
clause (b), (i) with respect to securities that are Reported Securities by
virtue of only clause A(iv) of the definition of Reported Securities,
Transaction Value with respect to any such Reported Security means the average
of the mid-point of the last bid and ask prices for such Reported Security as of
Maturity from each of at least three nationally recognized investment banking
firms retained for such purpose by the Company multiplied by the number of such
Reported Securities (as adjusted pursuant to Section 2.04(b)(4)) received per
share IBC Common Stock and (ii) with respect to all other Reported Securities,
if there are not 20 Trading Days for any particular Reported Security occurring
later than the 60th calendar day immediately prior to, but not including, the
date of Maturity, Transaction Value with respect to such Reported Security means
the market value per security of such Reported Security as of Maturity as
determined by a nationally recognized investment banking firm retained for such
purpose by the Company multiplied by the number of such Reported Securities (as
adjusted pursuant to Section 2.04(b)(4)) received per share of IBC Common Stock.
For purposes of calculating Transaction Value, any cash, Reported Securities or
other property receivable in an Adjustment Event shall be deemed to have been
received immediately prior to the close of business on the record date for such
Adjustment Event or, if there is no record date for such Adjustment Event,
immediately prior to the close of business on the effective date of such
Adjustment Event.

          "Trigger Event" has the meaning set forth in Section 2.04(a)(iii).
           -------------                              

           Section 1.02  Effect of Headings.
                         ------------------ 

           The Article and Section headings herein are for convenience only and
shall not affect the construction hereof.
<PAGE>
 
                                                                               6

          Section 1.03  Successors and Assigns.
                        ---------------------- 

          All covenants and agreements in this Supplemental Indenture by the
Company shall bind its successors and assigns, whether so expressed or not.

          Section 1.04  Separability.
                        ------------ 

          In case any provision in this Supplemental Indenture or the SAILS
shall be invalid, illegal or unenforceable, the validity, legality and
enforceability of the remaining provisions shall not in any way be affected or
impaired thereby.

          Section 1.05  Conflict with Trust Indenture Act.
                        ---------------------------------

          If any provision hereof limits, qualifies or conflicts with another
provision hereof which is required to be included in this Supplemental Indenture
by any of the provisions of the Trust Indenture Act, such required provision
shall control.

          Section 1.06  Benefits of Supplemental Indenture.
                        ---------------------------------- 

          Nothing in this Supplemental Indenture, expressed or implied, shall
give to any person, other than the parties hereto and their successors
hereunder, and the holders of the SAILS any benefit or any legal or equitable
right, remedy or claim under this Supplemental Indenture.

           Section 1.07  Application of Supplemental Indenture.
                         ------------------------------------- 

          This Supplemental Indenture shall take effect on the date hereof, and
shall apply only to the SAILS.  This Supplemental Indenture shall have no effect
on any other Securities, whether originally issued prior to the date hereof or
thereafter.

          Section 1.08  Governing Law.
                        ------------- 

          THIS SUPPLEMENTAL INDENTURE AND THE SAILS SHALL BE DEEMED TO BE A
CONTRACT MADE UNDER THE LAWS OF THE STATE OF NEW YORK AND THIS SUPPLEMENTAL
INDENTURE AND EACH SUCH SAILS SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE
WITH THE LAWS OF THE STATE OF NEW YORK.

                                  ARTICLE II.

                                   THE SAILS

          Section 2.01  Title and Terms.
                        --------------- 

          There is hereby created under the Indenture a series of Securities
known and designated as the "7% Exchangeable Notes Due 2000" of the Company.
The aggregate principal amount of SAILS that may be authenticated and delivered
under this Indenture is
<PAGE>
 
                                                                               7

limited to $479,953,687.50, except for SAILS authenticated and delivered upon
reregistration of, transfer of, or in exchange for, or in lieu of, other SAILS
pursuant to Sections 2.8, 2.9 or 2.11 of the Indenture.

          The stated maturity for payment of principal of the SAILS shall be
August 1, 2000 ("Stated Maturity") and the SAILS shall bear interest on the
principal amount at the rate of 7% per annum, from the date of original issuance
or the most recent interest payment date to which interest has been paid or duly
provided for, payable quarterly in arrears on February 1, May 1, August 1 and
November 1 of each year (commencing November 1, 1997), to the persons in whose
names the SAILS (or any predecessor securities) are registered at the close of
business on the 15th day of the calendar month immediately preceding such
interest payment date, provided that interest payable at Maturity shall be
payable to the person to whom the principal is payable.

          The SAILS shall be issuable in denominations of $61.9375 and any
integral multiple thereof.

          The SAILS shall be initially issued in the form of one or more Global
Securities and the Depositary for the SAILS shall be The Depository Trust
Company, New York, New York.

          The SAILS shall not be redeemable prior to their Stated Maturity. The
SAILS shall not be subject to any sinking fund.

          The Company shall not be obligated to pay any additional amount on the
SAILS in respect of taxes, except as otherwise provided in Sections 2.06 and
3.01 hereof.

          The form of SAILS attached hereto as Exhibit A is hereby adopted,
pursuant to Sections 2.1, 2.14 and 8.1(e) of the Indenture, as a form of
Securities of a series that consists of SAILS.

          The SAILS shall be mandatorily exchangeable as provided in Section
2.02 hereof.

          Section 2.02  Exchange at Maturity.
                        -------------------- 
          Subject to Section 2.04, at Maturity the principal amount of each
SAILS shall be mandatorily exchanged by the Company into a number of shares of
IBC Common Stock and Reported Securities (or the equivalent amount of cash, as
provided below) at the Exchange Rate; provided, however, that, pursuant to
Section 2.03, no fractional shares of IBC Common Stock or Reported Securities
shall be issued.  The holders of the SAILS shall be responsible for the payment
of any and all brokerage costs upon the subsequent sale of such shares.  The
Company may, at its option, in lieu of delivering shares of IBC Common Stock and
Reported Securities, deliver cash in an amount (calculated to the nearest
1/100th of a dollar per SAILS or, if there is not a
<PAGE>
 
                                                                               8

nearest 1/100th of a dollar, then to the next higher 1/100th of a dollar) equal
to the product of the number of shares of IBC Common Stock otherwise deliverable
on the date of Maturity multiplied by the Maturity Price; provided, however,
that if such option is exercised, the Company shall deliver cash with respect to
all, but not less than all, of the IBC Common Stock that would otherwise be
deliverable.  In determining the amount of cash deliverable in exchange for the
SAILS in lieu of shares of IBC Common Stock pursuant to the prior sentence
hereof, if more than one SAILS shall be surrendered for exchange at one time by
the same holder, the amount of cash which shall be delivered upon exchange shall
be computed on the basis of the aggregate number of SAILS so surrendered at
Maturity.

          Section 2.03  No Fractional Shares.
                        -------------------- 

          If more than one SAILS shall be surrendered for exchange pursuant to
Section 2.02 at one time by the same holder, the number of full shares of IBC
Common Stock or Reported Securities which shall be delivered upon such exchange,
in whole or in part, as the case may be, shall be computed on the basis of the
aggregate number of SAILS surrendered.  No fractional shares or scrip
representing fractional shares of IBC Common Stock or Reported Securities shall
be issued or delivered upon any exchange pursuant to Section 2.02 of any SAILS.
In lieu of any fractional shares of IBC Common Stock or Reported Securities
which, but for the immediately preceding sentence, would otherwise be
deliverable upon such exchange, the Company, through any applicable Paying
Agent, shall make a cash payment in respect of such fractional interest in an
amount equal to the value of such fractional share at the Maturity Price.  The
Company shall, upon such exchange of any SAILS, provide cash to any applicable
Paying Agent in an amount equal to the cash payable with respect to any
fractional shares of IBC Common Stock or Reported Security deliverable upon such
exchange, and the Company shall retain such fractional shares of IBC Common
Stock or Reported Securities.

          Section 2.04  Adjustment of Exchange Rate.
                        --------------------------- 

          (a)  Adjustment for Distributions, Reclassifications, etc.  The
               -----------------------------------------------------     
Exchange Rate shall be subject to adjustment from time to time as follows:

          (i)  If IBC shall, after the date hereof:

               (A)  pay a stock dividend or make a distribution, in each case,
          with respect to IBC Common Stock in shares of IBC Common Stock;

               (B)  subdivide or split the outstanding shares of IBC Common
          Stock into a greater number of shares;

               (C)  combine the outstanding shares of IBC Common Stock into a
          smaller number of shares; or
<PAGE>
 
                                                                               9

               (D)  issue by reclassification (other than a reclassification
          pursuant to clause (ii), (iii), (iv) or (v) of the definition of
          Adjustment Event) of the outstanding shares of IBC Common Stock any
          shares of common stock of IBC;

     (each of the foregoing, together with the event described in paragraph
     (a)(ii) of this Section, a "Dilution Event") then, in any such event, the
     Exchange Rate shall be adjusted by adjusting each of the Share Components
     of the Exchange Rate in effect immediately prior to such event so that a
     holder of any SAILS shall be entitled to receive, upon mandatory exchange
     of the principal amount of such SAILS at Maturity, the number of shares of
     IBC Common Stock (or, in the case of a reclassification referred to in
     clause (D) of this sentence, such number of shares and/or the number of
     other common shares of IBC issued pursuant to such reclassification,
     determined by allocating each of the Share Components among the securities
     held by a holder of IBC Common Stock following such event) which such
     holder of such SAILS would have owned or been entitled to receive
     immediately following such event had such SAILS been exchanged immediately
     prior to such event or any record date with respect thereto.  Each such
     adjustment shall become effective at the opening of business on the
     Business Day next following the record date for determination of holders of
     IBC Common Stock entitled to receive such dividend or distribution in the
     case of a dividend or distribution and shall become effective immediately
     after the effective date in the case of a subdivision, split, combination
     or reclassification.  Each such adjustment shall be made successively.

               (ii)   If IBC shall, after the date hereof, issue rights or
     warrants to all holders of IBC Common Stock entitling them to subscribe for
     or purchase shares of IBC Common Stock (other than rights or warrants
     described in clause (iii) below) at a price per share less than the Market
     Price of IBC Common Stock on the Business Day next following the record
     date for the determination of holders of IBC Common Stock entitled to
     receive such rights or warrants, then in each case the Exchange Rate shall
     be adjusted by multiplying each of the Share Components of the Exchange
     Rate in effect on the record date to the issuance of such rights or
     warrants by a fraction, of which the numerator shall be (A) the number of
     shares of IBC Common Stock outstanding on the record date for the issuance
     of such rights or warrants, plus (B) the number of additional shares of IBC
     Common Stock offered for subscription or purchase pursuant to such rights
     or warrants, and of which the denominator shall be (x) the number of shares
     of IBC Common Stock outstanding on the record date for the issuance of such
     rights or warrants, plus (y) the number of additional shares of IBC Common
     Stock which the aggregate offering price of the total number of
<PAGE>
 
                                                                              10

     shares of IBC Common Stock so offered for subscription or purchase pursuant
     to such rights or warrants would purchase at the Market Price of the IBC
     Common Stock on the Business Day next following the record date for the
     determination of holders of IBC Common Stock entitled to receive such
     rights or warrants, which number of additional shares shall be determined
     by multiplying such total number of shares by the exercise price of such
     rights or warrants and dividing the product so obtained by such Market
     Price.  Such adjustment shall become effective at the opening of business
     on the Business Day next following the record date for the determination of
     holders of IBC Common Stock entitled to receive such rights or warrants.

               (iii)    Notwithstanding the provisions of clause (ii) above, no
     adjustment of the Exchange Rate shall be required in the event that IBC
     shall (A) issue rights to purchase shares of IBC Common Stock pursuant to a
     plan for the reinvestment of dividends or (B) distribute to all holders of
     IBC Common Stock rights or warrants which, upon the occurrence of a
     specified event or events ("Trigger Event"), entitle such holders to
     subscribe for or purchase shares of IBC Common Stock or other capital stock
     of IBC at a price per share less than the Market Price of the IBC Common
     Stock or such other capital stock of IBC at the time of distribution,
     provided, however, that such adjustment of the Exchange Rate shall be made
     if, upon the occurrence of a Trigger Event, such holders acquire the right
     to subscribe for or purchase shares of IBC Common Stock or other capital
     stock of IBC at a price per share less than the Market Price of the IBC
     Common Stock or such other capital stock of IBC on the Business Day next
     following the date of the occurrence of the Trigger Event.  Such adjustment
     shall be made at the time that such rights or warrants actually become
     exercisable at such lesser price.

               (iv)   To the extent that any of the rights or warrants described
     in clause (ii) or (iii), for which adjustment has been made, above expire
     prior to the maturity of the SAILS and shares of IBC Common Stock are not
     delivered pursuant to such rights or warrants prior to such expiration, the
     Exchange Rate shall be readjusted to the Exchange Rate which would then be
     in effect had such adjustments for the issuance of such rights or warrants
     been made upon the basis of delivery of only the number of shares of IBC
     Common Stock actually delivered pursuant to such rights or warrants.  Each
     such adjustment shall be made successively.

               (v)   Any shares of IBC Common Stock issuable in payment of a
     dividend shall be deemed to have been issued immediately prior to the close
     of business on the record date for such dividend for purposes of
     calculating the number of outstanding shares of IBC Common Stock under
     paragraph (a)(ii) of this Section.
<PAGE>
 
                                                                              11

               (vi)   All adjustments to the Exchange Rate shall be calculated
     to the nearest 1/10,000th of a share of IBC Common Stock (or if there is
     not a nearest 1/10,000th of a share, to the next lower 1/10,000th of a
     share).  No adjustment in the Exchange Rate shall be required unless such
     adjustment would require an increase or decrease of at least one percent
     therein; provided, however, that any adjustments which by reason of this
     paragraph (a)(vi) are not required to be made shall be carried forward and
     taken into account in any subsequent adjustment.

          If an adjustment is made to the Exchange Rate pursuant to paragraphs
(a)(i) or (a)(ii) of this Section, an adjustment shall also be made to the
Maturity Price as such term is used to determine which of clauses (a), (b) or
(c) of the definition of "Exchange Rate" will apply at maturity and for purposes
of calculating the fraction in sub-clause (b)(i) of the definition of Exchange
Rate.  The required adjustment to the Maturity Price shall be made at maturity
by multiplying the Maturity Price by the cumulative number or fraction
determined pursuant to the Share Component adjustment procedure described above.
In the case of the reclassification of any shares of IBC Common Stock into any
common stock of IBC other than IBC Common Stock, such common stock shall be
deemed IBC Common Stock solely to determine the Maturity Price and to apply the
Exchange Rate at maturity.  Each such adjustment to the Exchange Rate and the
Maturity Price shall be made successively.

          (b)  Other Adjustment Events.  If an Adjustment Event occurs, the
               -----------------------                                     
property receivable by holders of SAILS at maturity shall be subject to
adjustment from time to time as follows:

          (1)  Each holder of a SAILS will receive at Maturity, in lieu of or
     (in the case of an Adjustment Event described in clause (i) of the
     definition thereof) in addition to, each share of IBC Common Stock that it
     would otherwise receive (as required by Section 2.02 and utilizing the
     Maturity Price described in subparagraph (b)(2) below), cash in an amount
     equal to (A) if the Maturity Price is greater than or equal to the
     Threshold Appreciation Price, 0.8197 multiplied by the Transaction Value,
     (B) if the Maturity Price is less than the Threshold Appreciation Price but
     greater than the Initial Price, the product of (x) the Initial Price
     divided by the Maturity Price multiplied by (y) the Transaction Value and
     (C) if the Maturity Price is less than or equal to the Initial Price, the
     Transaction Value.

          (2)  Following an Adjustment Event, the Maturity Price, as such term
     is used throughout the definition of Exchange Rate and in subparagraph
     (b)(1) above, shall be deemed to equal (A) the Maturity Price of the shares
     of the IBC Common Stock as adjusted pursuant to the provisions of the last
<PAGE>
 
                                                                              12

     paragraph of Section 2.04(a) hereof, plus (B) the Transaction Value.

          (3)  Notwithstanding the foregoing, with respect to any Reported
     Securities received in such Adjustment Event, the Company may, at its
     option, in lieu of delivering the amount of cash deliverable in respect of
     Reported Securities received in an Adjustment Event, determined in
     accordance with subparagraph (b)(l), deliver a number of such Reported
     Securities with a value equal to such cash amount, as determined in
     accordance with clause (b) of the definition of Transaction Value, as
     applicable; provided, however, that (i) if such option is exercised, the
     Company shall deliver Reported Securities in respect of all, but not less
     than all, cash amounts that would otherwise be deliverable in respect of
     Reported Securities received in an Adjustment Event, (ii) the Company may
     not exercise such option if the Company has elected to deliver cash in lieu
     of the shares of IBC Common Stock, if any, deliverable upon Maturity or if
     such Reported Securities have not yet been delivered to the holders
     entitled thereto following such Adjustment Event or any record date with
     respect thereto and (iii) subject to clause (ii) of this proviso, the
     Company must exercise such option if the Company does not elect to deliver
     cash in lieu of the shares of IBC Common Stock, if any, deliverable upon
     Maturity.  If the Company elects to deliver Reported Securities, each
     holder of a SAILS will be responsible for the payment of any and all
     brokerage and other transaction costs upon the sale of such Reported
     Securities.  If, following any Adjustment Event, any Reported Security
     ceases to qualify as a Reported Security, then (x) the Company may no
     longer elect to deliver such Reported Security in lieu of an equivalent
     amount of cash and (y) notwithstanding clause (b) of the definition of
     Transaction Value, the Transaction Value of such Reported Security shall
     mean the fair market value of such Reported Security on the date such
     security ceases to qualify as a Reported Security, as determined by a
     nationally recognized investment banking firm retained for this purpose by
     the Company.

          (4)  The amount of cash and/or the kind and number of securities into
     which the SAILS shall be exchangeable after an Adjustment Event shall be
     subject to adjustment following the date of such Adjustment Event in the
     same manner and upon the occurrence of the same type of events as described
     in paragraphs (a) and (b) of this Section with respect to shares of IBC
     Common Stock and IBC.

          (5)  For purposes of the foregoing, the term "Ordinary Cash Dividend"
     means, with respect to any consecutive 365-day period, any dividend with
     respect to IBC Common Stock paid in cash to the extent that the amount of
     such dividend, together with the aggregate amount of all other dividends on
     the IBC Common Stock paid in cash during such
<PAGE>
 
                                                                              13

     365-day period, does not exceed on a per share basis 10% of the average of
     the Closing Prices per share of IBC Common Stock over such 365-day period.

          Section 2.05  Notice of Adjustments and Certain other Events.
                        ---------------------------------------------- 

          (a)  Whenever the Exchange Rate is adjusted as herein provided or an
Adjustment Event occurs, the Company shall:

               (i)   forthwith compute the adjusted Exchange Rate (or
     Transaction Value) in accordance with Section 2.04 and prepare a
     certificate signed by an officer of the Company setting forth the adjusted
     Exchange Rate (or Transaction Value), the method of calculation thereof in
     reasonable detail and the facts requiring such adjustment and upon which
     such adjustment is based, which certificate shall be conclusive, final and
     binding evidence of the correctness of the adjustment, and file such
     certificate forthwith with the Trustee; and

               (ii)   within ten Business Days following the occurrence of a
     Dilution Event or an Adjustment Event that permits or requires a change in
     the consideration to be received by holders pursuant to Section 2.04(b)
     (or, in either case, if the Company is not aware of such occurrence, as
     soon as practicable after becoming so aware), provide written notice to the
     Trustee and to the holders of the outstanding SAILS of the occurrence of
     such Dilution Event or Adjustment Event, including a statement in
     reasonable detail setting forth the method by which any adjustment to the
     Exchange Rate or change in the consideration to be received was determined
     and setting forth the revised Exchange Rate or consideration, as the case
     may be, per SAILS; provided, however, that in respect of any adjustment to
     the Maturity Price, such notice need only disclose the factor by which the
     Maturity Price is to be multiplied pursuant to the last paragraph of
     Section 2.04(a) in order to determine which clause of the definition of the
     Exchange Rate will apply at maturity, it being understood that, until
     maturity, the Exchange Rate itself cannot be determined.

          (b)  In case at any time while any of the SAILS are outstanding the
Company receives notice that:

               (i)   IBC shall declare a dividend (or any other distribution) on
     or in respect of the IBC Common Stock to which Section 2.04(a)(i) or (ii)
     shall apply (other than any cash dividends and distributions, if any, paid
     from time to time by IBC that constitute Ordinary Cash Dividends);

               (ii)   IBC shall authorize the issuance to all holders of IBC
     Common Stock of rights or warrants to subscribe for or purchase shares of
     IBC Common Stock or of any other
<PAGE>
 
                                                                              14

     subscription rights or warrants (other than rights or warrants described in
     Section 2.04(a)(iii));

               (iii)    there shall occur any conversion or reclassification of
     IBC Common Stock (other than a subdivision or combination of such
     outstanding shares of IBC Common Stock) or any consolidation, merger or
     reorganization to which IBC is a party and for which approval of any
     stockholders of IBC is required, or the sale or transfer of all or
     substantially all of the assets of IBC; or

               (iv)   there shall occur the voluntary or involuntary
     dissolution, liquidation or winding up of IBC;

then the Company shall promptly cause to be delivered to the Trustee and any
applicable Paying Agent and filed at the office or agency maintained for the
purpose of exchange of SAILS at maturity, and shall promptly cause to be mailed
to the holders of SAILS at their last addresses as they shall appear upon the
registration books of the Securities registrar, at least ten days before the
date hereinafter specified (or the earlier of the dates hereinafter specified,
in the event that more than one is specified), a notice stating (x) the date on
which a record is to be taken for the purpose of such dividend, distribution or
grant of rights or warrants or, if a record is not to be taken, the date as of
which the holders of IBC Common Stock of record to be entitled to such dividend,
distribution or grant of rights or warrants are to be determined, or (y) the
date, if known by the Company, on which such reclassification, consolidation,
merger, sale, transfer, dissolution, liquidation or winding up is expected to
become effective.  Following any Adjustment Event, the provisions of this
paragraph (b) shall apply with respect to any Reported Securities in the same
manner as with respect to IBC and the IBC Common Stock.

          (c)  On or prior to the fourth Business Day preceding the Stated
Maturity of the SAILS, the Company shall provide notice to the holders of record
of the SAILS and to the Trustee and will publish a notice in a daily newspaper
of national circulation stating whether the Company will deliver, in accordance
with Section 2.02, shares of IBC Common Stock or cash (and/or, in accordance
with Section 2.04(b), cash or Reported Securities) upon the mandatory exchange
of the principal amount of the SAILS; provided, however, in the event the
Company intends to deliver cash, the Company shall have the right to require
certification as to the domicile and residency of each beneficial holder of
SAILS, as a condition to delivery of such cash.  After the close of business on
the Business Day immediately preceding the Stated Maturity of the SAILS, the
Company shall notify the Trustee in writing of the number of shares of IBC
Common Stock and/or Reported Securities, or the amount of cash to be paid per
SAILS.
<PAGE>
 
                                                                              15

          Section 2.06  Taxes.
                        ----- 

          (a)  The Company will pay any and all documentary, stamp, transfer or
similar taxes that may be payable in respect of the transfer and delivery of IBC
Common Stock (or Reported Securities) pursuant hereto; provided, however, that
the Company shall not be required to pay any such tax which may be payable in
respect of any transfer involved in the delivery of IBC Common Stock (or
Reported Securities) in a name other than that in which the SAILS so exchanged
were registered, and no such transfer or delivery shall be made unless and until
the person requesting such transfer has paid to the Company the amount of any
such tax, or has established, to the satisfaction of the Company, that such tax
has been paid.

          (b)  The parties hereto hereby agree, and each holder of a SAILS by
its purchase of a SAILS hereby agrees (in the absence of an administrative
determination or judicial ruling to the contrary):

          (i)   to treat, for U.S. federal income tax purposes, each SAILS
     as a forward purchase contract to purchase IBC Common Stock at Maturity
     (including as a result of acceleration or otherwise) (the "forward purchase
     contract characterization"), under the terms of which contract (a) at the
     time of issuance of the SAILS the holder deposits irrevocably with the
     Company a fixed amount of cash equal to the purchase price of the SAILS to
     assure the fulfillment of the holder's purchase obligation described in
     clause (c) below, which deposit will unconditionally and irrevocably be
     applied at Maturity to satisfy such obligation, (b) until Maturity the
     Company will be obligated to pay interest on such deposit at a rate equal
     to the stated rate of interest on the SAILS as compensation to the holder
     for the Company's use of such cash deposit during the term of the SAILS,
     and (c) at Maturity such cash deposit unconditionally and irrevocably will
     be applied by the Company in full satisfaction of the holder's obligation
     under the forward purchase contract, and the Company will deliver to the
     holder the number of shares of IBC Common Stock (and Reported Securities)
     that the holder is entitled to receive at that time pursuant to the terms
     of the SAILS (subject to the Company's right to deliver cash in lieu of
     shares of IBC Common Stock and Reported Securities);

               (ii)   to treat, consistent with the above characterization, (x)
     amounts paid to the Company in respect of the original issue of a SAILS as
     allocable in their entirety to the amount of the cash deposit attributable
     to such SAILS, and (y) amounts denominated as interest that are payable
     with respect to the SAILS as interest payable on the amount of such
     deposit, includible annually in the income of the holder as interest income
     in accordance with its method of accounting; and
<PAGE>
 
                                                                              16

               (iii)    to file all U.S. federal, state and local income and
     franchise tax returns consistent with the forward purchase contract
     characterization (unless required otherwise by an applicable taxing
     authority).

          Section 2.07  Delivery of Securities upon Maturity.
                        ------------------------------------ 

          All shares of IBC Common Stock and Reported Securities deliverable to
holders upon the Maturity of the SAILS shall be delivered to such holders,
whenever practicable, in such manner (such as by book-entry transfer) so as to
assure same-day transfer of such securities to holders and otherwise in the
manner customary at such time for delivery of such securities and securities of
the same type.

                                  ARTICLE III.

                                   COVENANTS

          Section 3.01  Shares Free and Clear.
                        --------------------- 

          With respect to the SAILS only and for the benefit of only the holders
thereof, the Company covenants and warrants, unless the Company elects to
deliver cash in lieu of IBC Common Stock, that upon exchange of a SAILS at
Maturity pursuant to the Indenture and this Supplemental Indenture, the holder
of a SAILS shall receive good and valid title to the IBC Common Stock and, in
the event an Adjustment Event has occurred, the Reported Securities (unless the
Company elects to deliver cash in lieu of Reported Securities) for which such
SAILS is at such time exchangeable pursuant to this Indenture, free and clear of
all liens, encumbrances, equities and claims whatsoever.  Except as otherwise
provided in Section 2.06(a), the Company shall pay all taxes and charges with
respect to the delivery of IBC Common Stock (and Reported Securities) delivered
in exchange for SAILS hereunder.  In addition, the Company further warrants that
any shares of IBC Common Stock (and Reported Securities) delivered in exchange
for SAILS hereunder shall be free of any transfer restrictions (other than such
as are solely attributable to any holder's status as an affiliate of IBC or the
issuer of such Reported Securities).

          Section 3.02  Discharge of Indenture.
                        ---------------------- 

          The provisions of Section 13.2 of the Indenture with respect to
defeasance shall not be applicable to the SAILS.
<PAGE>
 
                                                                              17

                                 ARTICLE IV.

                                 MISCELLANEOUS

          Section 4.01  Confirmation of Indenture.
                        ------------------------- 

          The Indenture, as supplemented and amended by this Supplemental
Indenture and all other indentures supplemental thereto, is in all respects
ratified and confirmed, and the Indenture, this Supplemental Indenture and all
indentures supplemental thereto shall be read, taken and construed as one and
the same instrument.

          Section 4.02  Concerning the Trustee.
                        ---------------------- 

          The Trustee assumes no duties, responsibilities or liabilities by
reason of this Supplemental Indenture other than as set forth in the Indenture.

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

          This Supplemental Indenture may be executed in any number of
counterparts, each of which shall be an original; but such counterparts shall
together constitute but one and the same instrument.
<PAGE>
 
                                                                              18

          IN WITNESS WHEREOF, the parties hereto have caused this Supplemental
Indenture to be duly executed, and their respective corporate seals to be
hereunto affixed and attested, all as of the day and year first above written.

                                              RALSTON PURINA COMPANY
                              
                              
                                              By:________________________
                                                 Name:
                                                 Title:

Attest:_____________________
       Name:
       Title:


                                              THE FIRST NATIONAL BANK
                                              OF CHICAGO
                              
                                        
                                              By:________________________
                                                 Name:
                                                 Title:

Attest:____________________
       Name:
       Title:
<PAGE>
 
                                                                              19

STATE OF MISSOURI
                        SS.:
COUNTY OF
CITY OF ST. LOUIS

          on the ____ day of ________, 1997, before me personally came
_________________, to me known, who, being by me duly sworn, did depose and say
that he is the ______________ of RALSTON PURINA COMPANY, one of the parties
described in and which executed the above instrument; that she/he knows the seal
of said corporation; that the seal affixed to said instrument is such corporate
seal; that it was so affixed by authority of the board of directors of said
corporation, and that she/he signed her/his name thereto by like authority.

                                                ___________________________
                                                      NOTARY PUBLIC



SEAL



STATE OF ILLINOIS       SS.:
COUNTY OF COOK


          on the ____ day of __________, 1997, before me personally came
____________, to me known, who, being by me duly sworn, did depose and say that
he is the ___________ of THE FIRST NATIONAL BANK OF CHICAGO, one of the
corporations described in and which executed the above instrument; that she/he
knows the seal of said corporation; that the seal affixed to said instrument is
such corporate seal; that it was so affixed by authority of the board of
directors of said corporation, and that she/he signed her/his name thereto by
like authority.


                                                  ______________________
                                                      NOTARY PUBLIC


SEAL
<PAGE>
 
                                                                       EXHIBIT A

          This Security is a Global Security within the meaning of the Indenture
hereinafter referred to and is registered in the name of the Depositary
hereinafter referred to or a nominee of the Depositary.  This Security is
exchangeable for Securities registered in the name of a person other than the
Depositary or its nominee only in the limited circumstances described in the
Indenture, and may not be transferred except as a whole by the Depositary to a
nominee of the Depositary or by a nominee of the Depositary to the Depositary or
another nominee of the Depositary.

          Unless this Security is presented by an authorized representative of
The Depository Trust Company (the "Depository") to the Company or its agent for
registration of transfer, exchange or payment, and any security issued is
registered in the name of Cede & Co., or such other name as requested by an
authorized representative of The Depository Trust Company and any payment hereon
is made to Cede & Co., ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY A PERSON IS WRONGFUL since the registered owner hereof, Cede & Co.,
has an interest herein.

NO.  R-                                                  CUSIP NO. 751277 40 1

                            [Form of Face of SAILS]
                             RALSTON PURINA COMPANY
                                   SAILS/(SM)/
              (STOCK APPRECIATION INCOME LINKED SECURITIES/(SM)/
                         7% EXCHANGEABLE NOTE DUE 2000

              (Subject to Exchange at Maturity into Common Stock,
         Par Value $.01 Per Share, of Interstate Bakeries Corporation)

          Ralston Purina Company, a corporation duly organized and existing
under the laws of Missouri (hereinafter called the "Company", which term
includes any successor corporation under the Indenture hereinafter referred to),
for value received, hereby promises to pay to Cede & Co., or registered assigns,
the principal sum of ___________ DOLLARS (US$_____________) (or $61.9375 for
each Stock Appreciation Income Linked Security (each, a "SAILS") represented by
this note) on August 1, 2000 (subject to the mandatory exchange provisions at
Maturity described below), and to pay interest thereon (computed on the basis of
a 360-day year of twelve 30-day months) on such principal amount from the date
of original issuance or from the most recent Interest Payment Date (as defined
below) to which interest has been paid or duly provided for, quarterly in
arrears on February 1, May 1, August 1 and November 1 of each year (each, an
"Interest Payment Date" and, collectively, the "Interest Payment Dates"),
commencing November 1, 1997, at the rate per annum specified in the title of
this note, until the principal hereof is paid or made available for payment.
The interest so payable, and punctually paid or duly provided for, on any
<PAGE>
 
                                                                               2

 
Interest Payment Date will, as provided in such Indenture, be paid to the person
in whose name this SAILS (or the SAILS in exchange or substitution for which
this SAILS was issued) is registered at the close of business on the Regular
Record Date (as defined below) for interest payable on such Interest Payment
Date.  The Regular Record Date for any interest payment is the close of business
on the 15th day of the calendar month immediately preceding the relevant
Interest Payment Date, whether or not a Business Day (as defined below),
provided that interest payable at maturity shall be payable to the person to
whom the principal hereof is payable.  In any case where such Interest Payment
Date falls on a day which is not a business day or which is a legal holiday on
which the corporate trust office of the Trustee or banking institutions in the
place of payment are authorized or required to close (notwithstanding any other
provision of said Indenture or this SAILS) payment of such interest need not be
made on such date, but may be made on the next succeeding business day with the
same force and effect as if made on such Interest Payment Date, and, if such
payment is so made, no interest shall accrue for the period from and after such
Interest Payment Date.  Any such interest not so punctually paid or duly
provided for shall forthwith cease to be payable to the holder on such Regular
Record Date, and may either be paid to the person in whose name this SAILS (or
the SAILS in exchange or substitution for which this SAILS was issued) is
registered at the close of business on a special record date as described in
Section 2.7 of the Indenture for the payment of such defaulted interest to be
fixed by the Trustee, notice whereof shall be given to holders of the SAILS not
less than 10 days prior to such special record date, or may be paid at any time
in any other lawful manner not inconsistent with the requirements of any
securities exchange on which the SAILS may be listed, and upon such notice as
may be required by such exchange, all as more fully provided in said Indenture.

          At maturity, the principal amount of this SAILS will be mandatorily
exchanged into a number of shares of common stock, par value $.01 per share (the
"IBC Common Stock"), of Interstate Bakeries Corporation ("IBC") at the Exchange
Rate (as defined below) or an equivalent amount of cash at the option of the
Company as discussed below.  The "Exchange Rate" is equal to (a) if the Maturity
Price (as defined below) is greater than or equal to $75.5638 (the "Threshold
Appreciation Price"), 0.8197 of a share of IBC Common Stock per SAILS, (b) if
the Maturity Price is less than the Threshold Appreciation Price but is greater
than $61.9375 (the "Initial Price"), (i) a fraction equal to the Initial Price
divided by the Maturity Price of (ii) one share of IBC Common Stock per SAILS
(such fractional share being calculated to the nearest 1/10,000th of a share or,
if there is not a nearest 1/10,000th of a share, to the next lower 1/10,000th of
a share) and (c) if the Maturity Price is less than or equal to the Initial
Price, one share of IBC Common Stock per SAILS.  ACCORDINGLY, THE VALUE OF THE
SHARES OF IBC COMMON STOCK TO BE RECEIVED BY HOLDERS OF THE SAILS (OR, AS
DISCUSSED BELOW, THE
<PAGE>
 
                                                                               3
 
CASH EQUIVALENT THAT MAY BE RECEIVED IN LIEU OF SUCH SHARES) AT MATURITY WILL
NOT NECESSARILY EQUAL THE PRINCIPAL AMOUNT OF SUCH SAILS.  Any shares of IBC
Common Stock delivered by the Company to the holders of the SAILS that are not
affiliated with IBC shall be free of any transfer restrictions, and the holders
of SAILS will be responsible for the payment of any and all brokerage costs upon
the subsequent sale of such shares.  No fractional shares of IBC Common Stock
will be issued at maturity as provided in the Indenture.

          The Company may at its option, in lieu of delivering shares of IBC
Common Stock, deliver cash in an amount equal to the value of such number of
shares of IBC Common Stock at the Maturity Price as provided in the Indenture;
provided, however, that if such option is exercised, the Company shall deliver
- ------------------                                                            
cash with respect to all, but not less than all, of the shares of IBC Common
Stock that would otherwise be deliverable.

          Notwithstanding the foregoing, (i) in the case of certain Dilution
Events, the Exchange Rate and the Maturity Price will be subject to adjustment
and (ii) in the case of certain Adjustment Events, the consideration received by
holders of SAILS at Maturity will be shares of IBC Common Stock, other
securities and/or cash, each as provided in the Indenture.

          The "Maturity Price" is defined as the average Closing Price per share
of IBC Common Stock for the 20 Trading Days immediately prior to (but not
including) the date of maturity or, under certain circumstances, the market
value per share of IBC Common Stock as of the date of maturity as determined by
a nationally recognized investment banking firm retained for this purpose by the
Company, as provided in the Indenture.  The "Closing Price" of any security on
any date of determination means (i) the closing sale price (or, if no closing
sale price is reported, the last reported sale price) of such security, (regular
way) on the New York Stock Exchange (the "NYSE") on such date, (ii) if such
security is not listed for trading on the NYSE on any such date, as reported in
the composite transactions for the principal United States securities exchange
on which such security is so listed, (iii) if such security is not so listed on
a United States national or regional securities exchange, as reported by the
Nasdaq Stock Market, (iv) if such security is not so reported, the last quoted
bid price for such security in the over-the-counter market as reported by the
National Quotation Bureau or similar organization or (v) if such security is not
so quoted, the average of the mid-point of the last bid and ask prices for such
security from each of at least three nationally recognized investment banking
firms selected for such purpose by the Company.  A "Trading Day" means a
Business Day on which the security the Closing Price of which is being
determined (i) is not suspended from trading on any national or regional
securities exchange or association or over-the-counter market at the close of
business and (ii) has traded at least once on the national or regional
securities exchange or association or over-the-counter
<PAGE>
 
                                                                               4
 
market that is the primary market for the trading of such security.  "Business
Day" means any day that is not a Saturday, a Sunday or a day on which the NYSE
or banking institutions or trust companies in The City of New York, New York are
authorized or obligated by law or executive order to close.

          Interest on this SAILS will be payable, and delivery of shares of IBC
Common Stock (or, at the Company's option, cash in an amount equal to the value
of such IBC Common Stock and/or such other consideration as permitted or
required herein) in exchange for the principal amount of this SAILS at maturity
will be made upon surrender of this SAILS, at the office or agency of the
Company maintained for that purpose in St. Louis, Missouri and payment of
interest on (and, if the Company elects not to deliver IBC Common Stock and/or
other securities upon exchange at maturity, the cash equivalent thereof payable
upon exchange for the principal amount of) this SAILS will be made in such coin
or currency of the United States of America as at the time of payment is legal
tender for payment of public and private debts; provided, however, that at the
option of the Company, payment of interest may be made by check mailed to the
address of the Person entitled thereto as such address shall appear on the
register for the SAILS.

          Reference is hereby made to the further provisions of this SAILS set
forth on the reverse hereof, which further provisions shall for all purposes
have the same effect as if set forth at this place.

          Unless the certificate of authentication hereon has been executed by
or on behalf of the Trustee referred to on the reverse hereof by manual
signature, this SAILS shall not be entitled to any benefit under the Indenture,
or be valid or obligatory for any purpose.  "SAILS" and "Stock Appreciation
Income Linked Securities" are service marks of Credit Suisse First Boston
Corporation.
<PAGE>
 
                                                                               5
 
          IN WITNESS WHEREOF, Ralston Purina Company has caused this instrument
to be duly executed under its corporate seal.

Dated:  July 29, 1997                      RALSTON PURINA COMPANY


                                           By:________________________
                                              Name:
                                              Title:

Attest:
Name:
<PAGE>
 
                                                                               6
 
                    TRUSTEE'S CERTIFICATE OF AUTHENTICATION

          This is one of the Securities of the series designated as SAILS
referred to in the within-mentioned Indenture.

                                    THE FIRST NATIONAL BANK OF CHICAGO, as
                                    Trustee


                                    By:__________________________________
                                          Authorized Officer
<PAGE>
 
                           [Form of Reverse of SAILS]

                             RALSTON PURINA COMPANY

                         7% EXCHANGEABLE NOTE DUE 2000

               (Subject to Exchange at Maturity into Common Stock
         Par Value $.01 Per Share, of Interstate Bakeries Corporation)

          This SAILS is one of a duly authorized issue of securities of the
Company (hereinafter called the "Securities") issued and to be issued in one or
more series under an Indenture, dated as of May 26, 1995, as supplemented by the
First Supplemental Indenture dated July 29, 1997 (as so supplemented and as may
be further supplemented from time to time, the "Indenture") between the Company
and The First National Bank of Chicago, as Trustee (herein called the "Trustee",
which term includes any successor trustee under the Indenture), to which
Indenture and all other indentures supplemental thereto reference is hereby made
for a statement of the respective rights, limitation of rights, duties and
immunities thereunder of the Company, the Trustee and the holders of the
Securities and of the terms upon which the Securities are, and are to be,
authenticated and delivered.  This SAILS is one of a series of the Securities
designated on the face hereof, limited in aggregate principal amount to
$479,953,687.50.

          The SAILS may not be redeemed and are not entitled to the benefit of
any sinking fund.

          The provisions of Section 13.2 of the Indenture with respect to
defeasance of the Debt Securities of a series and covenant defeasance of the
Securities of a series, respectively, shall not be applicable to the SAILS, as
provided in a supplement to the Indenture.

          If an Event of Default with respect to the SAILS shall occur and be
continuing, the principal of all SAILS may be declared due and payable and
therefore will result in the mandatory exchange of the principal amount thereof
for IBC Common Stock (or, at the Company's option, cash and/or such other
consideration as permitted or required herein), all in the manner and with the
effect provided in the Indenture.

          The Indenture contains provisions permitting the Company and the
Trustee to modify the Indenture or any supplemental indenture without the
consent of the holders of the Securities in regard to matters including, without
limitation, the following:  (a) to pledge to the Trustee as security for the
Securities of one or more series any property or assets, (b) to evidence the
succession of another corporation to the Issuer, (c) to add to the covenants of
the Issuer such further covenants, restrictions, conditions or provisions as the
Board of Directors and the Trustee shall consider to be for the protection of
the Holders of Securities, (d) to cure any ambiguity or to correct or
<PAGE>
 
                                                                               2
 
supplement any provision and (e) to establish the form or terms of new
Securities of any series.  The Indenture also permits, with certain exceptions
as therein provided, the amendment thereof and the modification of the rights
and obligations of the Company and the rights of the holders of the Securities
of each series to be affected under the Indenture at any time by the Company and
the Trustee with the consent of the majority of the holders in principal amount
of the Securities at the time outstanding of each series to be affected.  The
Indenture also contains provisions permitting the holders of specified
percentages in principal amount of the Securities of each series at the time
outstanding, on behalf of the holders of all Securities of such series, to waive
compliance by the Company with certain provisions of the Indenture and certain
past defaults under the Indenture and their consequences.  Any such consent or
waiver by the holder of this SAILS shall be conclusive and binding upon such
holder and upon all future holders of this SAILS and of any Security issued upon
the registration of transfer hereof or in exchange herefor or in lieu hereof,
whether or not notation of such consent or waiver is made upon this SAILS.

          No reference herein to the Indenture and no provision of this SAILS or
of the Indenture shall alter or impair the obligation of the Company, which is
absolute and unconditional, to pay the principal of and interest on this SAILS
at the times, place and rate, and in the manner, herein prescribed.

          As provided in the Indenture and subject to certain limitations
therein set forth, this SAILS is transferable in the Security register, upon
surrender of this SAILS for registration of transfer at the office or agency of
the Company in any place where the principal of and interest on this SAILS are
payable, duly endorsed by, or accompanied by a written instrument of transfer in
form satisfactory to the Company and the Security registrar duly executed by,
the holder hereof or his attorney duly authorized in writing, and thereupon one
or more new SAILS, of authorized denominations and for the same aggregate
principal amount, will be issued to the designated transferee or transferees.

          SAILS are issuable only in registered form without coupons in
denominations of $61.9375 and any integral multiple thereof.  As provided in the
Indenture and subject to certain limitations therein set forth, SAILS are
exchangeable for a like aggregate principal amount of SAILS and of like tenor of
a different authorized denomination, as requested by the holder surrendering the
same.

          No service charge shall be made for any such registration of transfer
or exchange, but the Company may require payment of a sum sufficient to cover
any tax or other governmental charge payable in connection therewith.
<PAGE>
 
                                                                               3

          Prior to due presentment of this SAILS for registration of transfer,
the Company, the Trustee and any agent of the Company or the Trustee may treat
the Person in whose name this SAILS is registered as the owner hereof for all
purposes, whether or not this SAILS be overdue, and neither the Company, the
Trustee nor any such agent shall be affected by notice to the contrary.

          All terms used in this SAILS which are defined in the Indenture shall
have the meanings assigned to them in the Indenture.

          THIS SAILS SHALL FOR ALL PURPOSES BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.
<PAGE>
 
                                 ABBREVIATIONS

          The following abbreviations, when used in the inscription on the face
of this instrument, shall be construed as though they were written out in full
according to applicable laws or regulations:

TEN COM--as tenants in common        UNIF GIFT MIN ACT-- ____ Custodian _______
TEN ENT--as tenants by the entireties               (Cust)    (Minor)
JT TEN --as joint tenants with right of  Under Uniform Gifts to Minors Act
      survivorship and not as tenants
      in common                                 ________________________________
                                                            (State)

    Additional abbreviations may also be used though not in the above list.

          FOR VALUE RECEIVED, the undersigned hereby sell(s), assign(s) and
transfer(s) unto

Please insert Social Security or Taxpayer I.D. or
other Identifying Number of Assignee

________________________ 
_______________________________________________________________________________ 
  Please Print or Type Name and Address including Postal Zip Code of Assignee
 

________________________________________________________________________________
the within SAILS and all rights thereunder, hereby irrevocably constituting and
appointing 


________________________________________________ attorney to transfer said SAILS
on the books of Ralston Purina Company with full power of substitution in the
premises.

Dated:__________________________    ________________________________________
                                    Signature


                                    ________________________________________
                                    NOTICE: The signature to this assignment
                                    must correspond with the name as it appears
                                    upon the face of the within SAILS in every
                                    particular, without alteration or
                                    enlargement or any change whatsoever.

NOTICE: Signature(s) must bc guaranteed by a member
of an Approved Signature Guaranty Medallion Program.


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