OSI PHARMACEUTICALS INC
8-K, 1999-02-18
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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<PAGE>   1
                       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


                                February 18, 1999
                Date of Report (Date of earliest event reported)


                            OSI PHARMACEUTICALS, INC.
             (Exact name of registrant as specified in its charter)



          DELAWARE                        0-15190                13-3159796
(State or other jurisdiction of         (Commission           (I.R.S. Employer
        incorporation)                  File Number)         Identification No.)


                         106 CHARLES LINDBERGH BOULEVARD
                               UNIONDALE, NY 11553
                    (Address of principal executive offices)


                                 (516) 222-0023
              (Registrant's telephone number, including area code)
<PAGE>   2
ITEM 7.  EXHIBITS

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------
     EXHIBIT NO.                                         DESCRIPTION
- -----------------------------------------------------------------------------------------------------------------
<S>                     <C>
         99             Indenture, dated as of January 6, 1999, between OSI Pharmaceuticals, Inc. and The Bank of
                        New York, as Trustee.
- -----------------------------------------------------------------------------------------------------------------
</TABLE>
<PAGE>   3
                                    SIGNATURE


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


Date:  February 18, 1999               OSI PHARMACEUTICALS, INC.


                                   By: /s/ Robert L. Van Nostrand              
                                       -----------------------------------------
                                       Name: Robert L. Van Nostrand
                                       Title: Vice President and Chief Financial
                                              Officer, Secretary and Treasurer
<PAGE>   4
                                  EXHIBIT INDEX

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------
     EXHIBIT NO.                                                   DESCRIPTION
- -----------------------------------------------------------------------------------------------------------------
<S>                     <C>
         99             Indenture, dated as of January 6, 1999, between OSI Pharmaceuticals, Inc. and The Bank of
                        New York, as Trustee.
- -----------------------------------------------------------------------------------------------------------------
</TABLE>

<PAGE>   1
                                                                      EXHIBIT 99




                            OSI PHARMACEUTICALS, INC.
                                       and
                              THE BANK OF NEW YORK
                                     Trustee
                                    INDENTURE
                           Dated as of January 6, 1999

                                 DEBT SECURITIES
<PAGE>   2
                                TABLE OF CONTENTS


<TABLE>
<S>                                                                                                                  <C>
1. DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION........................................................    1

   1.1. Definitions...............................................................................................    1

   1.2. Compliance Certificates and Opinions......................................................................    7

   1.3. Form of Documents Delivered to Trustee....................................................................    7

   1.4. Acts of Holders...........................................................................................    7

   1.5. Notices, Etc., to Trustee and Company.....................................................................    8

   1.6. Notice to Holders; Waiver.................................................................................    8

   1.7. Conflict with Trust Indenture Act.........................................................................    9

   1.8. Effect of Headings and Table of Contents..................................................................    9

   1.9. Successors and Assigns....................................................................................    9

   1.10. Separability Clause......................................................................................    9

   1.11. Benefits of Indenture....................................................................................    9

   1.12. Governing Law............................................................................................    9

   1.13. Legal Holidays...........................................................................................   10


2. SECURITY FORMS.................................................................................................   10

   2.1. Forms Generally...........................................................................................   10

   2.2. Form of Face of Security..................................................................................   10

   2.3. Form of Reverse Side of Security..........................................................................   12

   2.4. Form of Trustee's Certificate of Authentication...........................................................   14


3. THE SECURITIES.................................................................................................   15

   3.1. Amount Unlimited; Issuable in Series......................................................................   15

   3.2. Denominations.............................................................................................   16
</TABLE>


                                      -i-
<PAGE>   3
<TABLE>
<S>                                                                                                                  <C>
   3.3. Execution, Authentication, Delivery and Dating............................................................   16

   3.4. Temporary Securities......................................................................................   18

   3.5. Registration, Registration of Transfer and Exchange.......................................................   18

   3.6. Mutilated, Destroyed, Lost and Stolen Securities..........................................................   19

   3.7. Payment of Interest; Interest Rights Preserved............................................................   20

   3.8. Persons Deemed Owners.....................................................................................   21

   3.9. Cancellation..............................................................................................   21

   3.10. Computation of Interest..................................................................................   21

   3.11. CUSIP Numbers............................................................................................   21


4. SATISFACTION AND DISCHARGE.....................................................................................   22

   4.1. Satisfaction and Discharge of Indenture...................................................................   22

   4.2. Application of Trust Money................................................................................   23


5. REMEDIES.......................................................................................................   23

   5.1. Events of Default.........................................................................................   23

   5.2. Acceleration of Maturity; Rescission and Annulment........................................................   25

   5.3. Collection of Indebtedness and Suit for Enforcement by Trustee............................................   26

   5.4. Trustee May File Proofs of Claim..........................................................................   27

   5.5. Trustee May Enforce Claims Without Possession of Securities...............................................   28

   5.6. Application of Money Collected............................................................................   28

   5.7. Limitation on Suits.......................................................................................   28

   5.8. Unconditional Rights of Holders to Receive Principal, Premium and Interest................................   29

   5.9. Restoration of Rights and Remedies........................................................................   29

   5.10. Rights and Remedies Cumulative...........................................................................   29

   5.11. Delay or Omission Not Waiver.............................................................................   30
</TABLE>


                                      -ii-
<PAGE>   4
<TABLE>
<S>                                                                                                                  <C>
   5.12. Control by Holders.......................................................................................   30

   5.13. Waiver of Past Defaults..................................................................................   30

   5.14. Undertaking for Costs....................................................................................   31

   5.15. Waiver of Stay or Extension Laws.........................................................................   31


6. THE TRUSTEE....................................................................................................   31

   6.1. Certain Duties and Responsibilities.......................................................................   31

   6.2. Notice of Defaults........................................................................................   32

   6.3. Certain Rights of Trustee.................................................................................   33

   6.4. Not Responsible for Recitals or Issuance of Securities....................................................   34

   6.5. May Hold Securities.......................................................................................   34

   6.6. Money Held in Trust.......................................................................................   34

   6.7. Compensation and Reimbursement............................................................................   35

   6.8. Disqualification; Conflicting Interests...................................................................   35

   6.9. Corporate Trustee Required; Eligibility...................................................................   36

   6.10. Resignation and Removal; Appointment of Successor........................................................   36

   6.11. Acceptance of Appointment by Successor...................................................................   38

   6.12. Merger, Conversion, Consolidation or Succession to Business..............................................   39

   6.13. Preferential Collection of Claims Against Company........................................................   39

   6.14. Appointment of Authenticating Agent......................................................................   43

   6.15. Trustee's Application for Instructions from the Company..................................................   45


7. HOLDERS LISTS AND REPORTS BY TRUSTEE AND COMPANY...............................................................   45

   7.1. Company to Furnish Trustee Names and Addresses of Holders.................................................   45

   7.2. Preservation of Information; Communications to Holders....................................................   46

   7.3. Reports by Trustee........................................................................................   47
</TABLE>


                                     -iii-
<PAGE>   5
<TABLE>
<S>                                                                                                                  <C>
   7.4. Reports by Company........................................................................................   48


8. CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE...........................................................   49

   8.1. Company May Consolidate, Etc., Only on Certain Terms......................................................   49

   8.2. Successor Corporation Substituted.........................................................................   50

   8.3. Officers' Certificates and Opinions of Counsel............................................................   50


9. SUPPLEMENTAL INDENTURES........................................................................................   50

   9.1. Supplemental Indentures without Consent of Holders........................................................   50

   9.2. Supplemental Indentures with Consent of Holders...........................................................   51

   9.3. Execution of Supplemental Indentures......................................................................   52

   9.4. Effect of Supplemental Indentures.........................................................................   52

   9.5. Conformity with Trust Indenture Act.......................................................................   53

   9.6. Reference in Securities to Supplemental Indentures........................................................   53


10. COVENANTS.....................................................................................................   53

   10.1. Payment of Premium and Interest..........................................................................   53

   10.2. Maintenance of Office or Agency..........................................................................   53

   10.3. Money for Securities Payments to Be Held in Trust........................................................   53

   10.4. Statement by Officers as to Default......................................................................   55

   10.5. Statement as to Compliance...............................................................................   55


11. REDEMPTION OF SECURITIES......................................................................................   55

   11.1. Applicability of Article.................................................................................   55

   11.2. Election to Redeem; Notice to Trustee....................................................................   55

   11.3. Selection by Trustee of Securities to be Redeemed........................................................   55

   11.4. Notice of Redemption.....................................................................................   56

   11.5. Deposit of Redemption Price..............................................................................   56
</TABLE>


                                      -iv-
<PAGE>   6
<TABLE>
<S>                                                                                                                  <C>
   11.6. Securities Payable on Redemption Date....................................................................   56

   11.7. Securities Redeemed in Part..............................................................................   57


12. SINKING FUNDS.................................................................................................   57

   12.1. Applicability of Article.................................................................................   57

   12.2. Satisfaction of Sinking Fund Payments with Securities....................................................   57

   12.3. Redemption of Securities for Sinking Fund................................................................   58


13. SUBORDINATION.................................................................................................   58

   13.1. Applicability of Article.................................................................................   58

   13.2. Securities Subordinated to Senior Indebtedness...........................................................   58

   13.3. No Payment on Securities in Certain Circumstances........................................................   58

   13.4. Securities Subordinated to Prior Payment of All Senior Indebtedness on
         Dissolution, Liquidation or Reorganization of Company....................................................   60

   13.5. Securityholders to be Subrogated to Rights of Holders of Senior Indebtedness.............................   60

   13.6. Obligations of the Company Unconditional.................................................................   61

   13.7. Trustee and Paying Account Entitled to Assume Payments Not Prohibited
         in Absence of Notice.....................................................................................   61

   13.8. Application by Trustee of Moneys Deposited With It.......................................................   61

   13.9. Subordination Rights Not Impaired by Acts or Omissions of Company or
         Holders of Senior Indebtedness...........................................................................   62

   13.10. Securityholders Authorize Trustee to Effectuate Subordination of Securities.............................   62

   13.11. Right of Trustee and Paying Agent to Hold Senior Indebtedness...........................................   63

   13.12. This Article Not to Prevent Events of Default...........................................................   63

   13.13. No Fiduciary Duty Created to Holders of Senior Indebtedness.............................................   63
</TABLE>


                                      -v-
<PAGE>   7
         THIS INDENTURE, dated as of January 6, 1999, between OSI
Pharmaceuticals, Inc., a corporation duly organized and existing under the laws
of the State of Delaware (herein called the "Company"), having its principal
office at 106 Charles Lindbergh Boulevard, Uniondale, New York 11553, and The
Bank of New York, a New York banking corporation, as Trustee (herein called the
"Trustee").

                              W I T N E S S E T H:

         WHEREAS, the Company has duly authorized the execution and delivery of
this Indenture to provide for the issuances from time to time of its unsecured
debentures, notes or other evidences of indebtedness (herein called the
"Securities"), to be issued in one or more series as this Indenture provides.

         WHEREAS, all things necessary to make this Indenture a valid agreement
of the Company, in accordance with its terms, have been done.

         NOW, THEREFORE, for and in consideration of the premises and the
purchase of the Securities by the Holders thereof, it is mutually covenanted and
agreed, for the benefit of the other party and for the equal and proportionate
benefit of all Holders (as defined herein) of the Securities, or series thereof,
as follows:

1.       DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION

         1.1.     Definitions.

                  (a)      For all purposes of this Indenture and any indenture
supplemental hereto, except as otherwise expressly provided or unless the
context otherwise requires:

                           (i)      the terms defined in this Article have
         meanings assigned to them in this Article and include the plural as
         well as the singular;

                           (ii)     all other terms used herein which are
         defined in the Trust Indenture Act or the Securities Act (as those
         terms are defined herein), either directly or by reference therein,
         have (except as herein otherwise expressly provided or unless the
         context otherwise requires) the meanings assigned to them therein as in
         force on the date of this Indenture;

                           (iii)    all accounting terms not otherwise defined
         herein have the meanings assigned to them in accordance with generally
         accepted accounting principals and except as otherwise herein expressly
         provided, the term "generally accepted accounting principles" with
         respect to any computation required or permitted hereunder shall mean
         such accounting principals as are generally accepted at the date of
         this Indenture; and
<PAGE>   8
                           (iv)     the words "herein", hereof" and "hereunder"
         and other words of similar import refer to this Indenture as a whole
         and not to any particular Article, Section or other subdivision.

                  (b)      Certain terms, used principally in Article Six, are
defined in that Article.

                  (c)      The following terms have the following means:

                           (i)      "Act", when used with respect to any Holder,
         has the meaning specified in Section 1.4.

                           (ii)     "Affiliate" of any specified Person means
         any other Person directly or indirectly controlling or controlled by or
         under direct or indirect common control with such specified Person. For
         the purposes of this definition, "control" when used with respect to
         any specified Person means the power to direct the management and
         policies of such Person, directly or indirectly, whether through the
         ownership of voting securities, by contract or otherwise; and the terms
         "controlling" and "controlled" have meanings correlative to the
         foregoing.

                           (iii)    "Authenticating Agent" means any Person
         authorized by the Trustee to act on behalf of the Trustee to
         authenticate Securities.

                           (iv)     "Board of Directors" means either the board
         of directors of the Company, the executive committee of such board or
         any duly authorized committee of such board.

                           (v)      "Board Resolution" means a copy of a
         resolution certified by the Secretary or an Assistant Secretary of the
         Company to have been duly adopted by the Board of Directors and to be
         in full force and effect on the date of such certification and
         delivered to the Trustee.

                           (vi)     "Business Day" means each Monday, Tuesday,
         Wednesday, Thursday and Friday which is not a day on which banking
         institutions in the city where the Trustee maintains its Corporate
         Trust Office are authorized or obligated by law to close.

                           (vii)    "Capitalized Lease Obligation" means
         Indebtedness represented by obligations under a lease that is required
         to be capitalized for financial reporting purposes in accordance with
         generally accepted accounting principles and the amount of such
         Indebtedness shall be the capitalized amount of such obligations
         determined in accordance with such principles.

                           (viii)   "Capital Stock" means any and all shares,
         interests, participations or other equivalents (however designated) or
         corporate stock.


                                      -2-
<PAGE>   9
                           (ix)     "Commission" means the Securities and
         Exchange Commission, as from time to time constituted, or, if at any
         time after the execution of this instrument such Commission is not
         existing and performing the duties now assigned to it under the Trust
         Indenture Act, then the body performing such duties at such time.

                           (x)      "Company" means the Person named as the
         "Company" in the first paragraph of this Indenture until a successor
         corporation shall have become such pursuant to the applicable
         provisions of this Indenture, and thereafter "Company" shall mean such
         successor corporation.

                           (xi)     "Company Request" or "Company Order" means a
         written request or order signed in the name of the Company by its
         Chief Executive Officer, President or a Vice President, and by its
         Treasurer, an Assistant Treasurer, its Secretary or an Assistant
         Secretary, and delivered to the Trustee.

                           (xii)    "Corporate Trust Office" means the principal
         office of the Trustee at which at any particular time its corporate
         trust business shall be administered, which office at the date of
         execution of this Indenture is located at 101 Barclay Street, Floor 21
         West, New York, NY 10286, Attention: Corporate Trust Administration.

                           (xiii)   "Corporation" includes corporations,
         associations, companies and business trusts.

                           (xiv)    "Event of Default" has the meaning specified
         in Section 5.1.

                           (xv)     "Holder" or "Securityholder" or similar
         terms means a Person in whose name a Security is registered in the
         Security Register.

                           (xvi)    "Indebtedness" means (A) any liability of
         any person (1) for borrowed money, (2) evidenced by a note, debenture
         or similar instrument (including a purchase money obligation) given in
         connection with the acquisition of any property or assets (other than
         inventory or similar property acquired in the ordinary course of
         business), including securities, or (3) for the payment of money
         relating to a Capitalized Lease Obligation; (B) any liability of others
         described in the preceding clause (A) which the person has guaranteed,
         is secured by a lien on any asset of such person or which is otherwise
         its legal liability; and (C) any amendment, renewal, extension or
         refunding of any liability of the types referred to in Clauses (A) and
         (B) above.

                           (xvii)   "Indenture" means this instrument as
         originally executed or as it may from time to time be supplemented or
         amended by one or more indentures supplemental hereto entered into
         pursuant to the applicable provisions hereof and shall include the
         terms of particular series of Securities established as contemplated by
         Section 3.1.


                                      -3-
<PAGE>   10
                           (xviii)  "Notes" means any Security of the series
         designated "One Year Notes" issued under this Indenture and pursuant to
         the Rights Agreement and substantially in the form of Exhibit 1 hereto.

                           (xix)    "Officers' Certificate" means a certificate
         signed by the Chief Executive Officer, President or a Vice President, 
         and by the Treasurer, an Assistant Treasurer, the Secretary or an 
         Assistant Secretary, of the Company, and delivered to the Trustee.

                           (xx)     "Opinion of Counsel" means a written opinion
         of counsel, who may be counsel for the Company and who shall be
         acceptable to the Trustee.

                           (xxi)    "Original Issue Date" of any Security (or
         any portion thereof) means the earlier of (A) the date of such Security
         or (B) the date of the first Security (or portion thereof) for which
         such Security was issued (directly or indirectly) on registration of
         transfer, exchange or substitution, provided, that the "Original Issue
         Date" for the Notes shall be the first date on which any such Note is
         issued.

                           (xxii)   "Outstanding" when used with respect to
         Securities or any series of Securities, means, as of the date of
         determination, all Securities or all Securities of such series, as the
         case may be, theretofore authenticated and delivered under this
         Indenture, except:

                                    (A)      Securities theretofore called by
                  the Trustee or delivered to the Trustee for cancellation;

                                    (B)      Securities, or portions thereof,
                  for whose payment or redemption money in the necessary amount
                  has been theretofore deposited with the Trustee or any Paying
                  Agent for the Holders of such Securities; provided that, if
                  such Securities are to be redeemed prior to the maturity
                  thereof, notice of such redemption has been duly given
                  pursuant to this Indenture or provision therefor satisfactory
                  to the Trustee has been made; and

                                    (C)      Securities which have been paid
                  pursuant to Section 3.6 or in exchange for or in lieu of which
                  other Securities have been authenticated and delivered
                  pursuant to this indenture, other than any such Securities in
                  respect of which there shall have been presented to the
                  Trustee proof satisfactory to it that such Securities are held
                  by a bona fide purchaser in whose hands such Securities are
                  valid obligations of the Company; provided, however, that in
                  determining whether the Holders of the requisite principal
                  amount of the Outstanding Securities have given any request,
                  demand, authorization, direction, notice, consent or waiver
                  hereunder, Securities owned by the Company or any other
                  obligor upon the Securities or any Affiliate of the Company or
                  of such other obligor 


                                      -4-
<PAGE>   11
                  shall be disregarded and deemed not to be Outstanding, except
                  that, in determining whether the Trustee shall be protected in
                  relying upon any such request, demand, authorization,
                  direction, notice, consent or waiver, only securities which a
                  Responsible Officer of the Trustee actually knows to be so
                  owned shall be so disregarded. Securities so owned which have
                  been pledged in good faith may be regarded as Outstanding if
                  the pledgee established to the satisfaction of the Trustee the
                  pledgee's right so to act with respect to such Securities and
                  that the pledgee is not the Company or any other obligor upon
                  the Securities or any Affiliate of the Company or of such
                  other obligor.

                           (xxiii)  "Paying Agent" means any person authorized
         by the Company to pay the principal of (and premium, if any) or
         interest on any Securities on behalf of the Company.

                           (xxiv)   "Person" means any individual, corporation,
         partnership, joint venture, association, joint-stock company, trust,
         unincorporated organization or association or government or any agency
         or political subdivision thereof.

                           (xxv)    "Predecessor Security" of any particular
         Security means every previous Security evidencing all or a portion of
         the same debt as that evidenced by such particular Security, and, for
         the purposes of this definition, any Security authenticated and
         delivered under Section 3.6 in exchange for or in lieu of a mutilated,
         destroyed, lost or stolen Security shall be deemed to evidence the same
         debt as the mutilated, destroyed, lost or stolen Security.

                           (xxvi)   "Redemption Date", when used with respect to
         any Security to be redeemed, means the date fixed for such redemption
         by or pursuant to this Indenture.

                           (xxvii)  "Redemption Price", when used with respect
         to any Security to be redeemed, means the price at which it is to be
         redeemed pursuant to this Indenture.

                           (xxviii) "Responsible Officer", when used with
         respect to the Trustee, means any officer in the Corporate Trust Office
         or any other officer in the Corporate Trust Office or any other officer
         of the Trustee customarily performing functions similar to those
         performed by any of the above designated officers and also means, with
         respect to a particular corporate trust matter, any other officer to
         whom such matter is referred because of his knowledge or any
         familiarity with the particular subject.

                           (xxix)   "Rights Agreement" means the Rights
         Agreement dated as of January 6, 1999 between the Company and The Bank
         of New York, as Rights Agent.


                                      -5-
<PAGE>   12
                           (xxx)    "Securities" has the meaning stated in the
         first recital of this Indenture and more particularly means any
         Securities authenticated and delivered under this Indenture.

                           (xxxi)   "Security Register" has the meaning
         specified in Section 3.5.

                           (xxxii)  "Senior Indebtedness" means, with respect to
         the Securities of a series which are subordinated in accordance with
         their terms as contemplated by Section 3.1, the principal or interest
         on and other amounts due on or in connection with (A) any Indebtedness
         of the Company designated in accordance with Section 3.1 as ranking
         senior to the Securities of that series, whether outstanding on the
         date of this Indenture or hereafter created, incurred, assumed or
         guaranteed in any manner by the Company or in effect guaranteed by the
         Company through an agreement to purchase or otherwise; and (B)
         deferrals, renewals, extensions or refundings of, or amendments,
         modifications or supplements to, Indebtedness of the kind described in
         the preceding clause (A), unless, in the case of any particular
         Indebtedness, deferral, renewal, extension, refunding, amendment,
         modification or supplement, the instrument creating or evidencing the
         same or the assumption or guarantee thereof expressly provides that
         such Indebtedness, deferral, renewal, extension, refunding, amendment,
         modification or supplement shall not be senior in right of payment to
         the Securities of that series.

                           (xxxiii) "Subsidiary" means a corporation more than
         50% of the outstanding voting stock of which is owned, directly or
         indirectly, by the Company or by one or more other Subsidiaries, or by
         the Company and one or more other Subsidiaries. For the purposes of
         this definition, "voting stock" means stock which ordinarily has voting
         power for the election of directors, whether at all times or only so
         long as no senior class of stock has such voting power by reason of any
         contingency.

                           (xxxiv)  "Trustee" means the Person named as the
         "Trustee" in the first paragraph of this Indenture until a successor
         Trustee shall have become such with respect to one or more series of
         Securities pursuant to the applicable provisions of this Indenture, and
         thereafter "Trustee" shall mean and include each Person who is then a
         Trustee hereunder, and if at any time there is more than one such
         Person, "Trustee" shall mean and include each such Person, and
         "Trustee", as used with respect to the Securities of any series, shall
         mean the Trustee with respect to Securities of that series.

                           (xxxv)   "Trust Indenture Act" means the Trust
         Indenture Act of 1939 as in force at the date as of which this
         Indenture was executed, except as provided in Section 9.5.


                                       -6-
<PAGE>   13
         1.2.     Compliance Certificates and Opinions.

                  Upon any application or request by the Company to the Trustee
to take any action under any provision of this Indenture, the Company shall
furnish to the Trustee an Officers' Certificate stating that all conditions
precedent, if any, provided for in this Indenture relating to the proposed
action have been complied with and, if requested by the Trustee, an Opinion of
Counsel stating that in the opinion of such counsel all such conditions
precedent, if any, have been complied with, except that in the case of any such
application or request as to which the furnishing of such documents is
specifically required by any provision of this Indenture relating to such
particular application or request, no additional certificate or opinion need be
furnished.

         1.3.     Form of Documents Delivered to Trustee.

                  (a)      In any case where several matters are required to be
certified by, or covered by an opinion of, any specified Person, it is not
necessary that all such matters be certified by, or covered by the opinion of,
only one such Person, or that they be so certified or covered by only one
document, but one such Person may certify or give an opinion with respect to
some matters and one or more other such Persons as to other matters, and any
such Person may certify or give an opinion as to such matters in one or several
documents.

                  (b)      Any certificate or opinion of an officer of the
Company may be based, insofar as it relates to legal matters, upon a certificate
or opinion of, or representations by, counsel, unless such officer knows that
the certificate or opinion or representations with respect to the matters upon
which his certificate or opinion is based are erroneous. Any such certificate or
opinion of, or representations by, counsel may be based, insofar as it relates
to factual matters, upon a certificate or opinion of, or representations by, an
officer or officers of the Company stating that the information with respect to
such factual matters is in the possession of the Company, unless such counsel
knows that the certificate or opinion or representations with respect to such
matters are erroneous.

                  (c)      Where any Person is required to make, give or execute
two or more applications, requests, consents, certificates, statements, opinion
or other instruments under this Indenture, they may, but need not, be
consolidated and form one instrument.

         1.4.     Acts of Holders.

                  (a)      Any requirement, demand, authorization, direction,
notice, consent, waiver or other action provided by this Indenture to be given
or taken by Holders may be embodied in and evidenced by one or more instruments
of substantially similar tenor signed by such Holders in person or by an agent
duly appointed in writing; and, except as herein otherwise expressly provided,
such action shall become effective when such instrument or instruments are
delivered to the Trustee and, where it is hereby expressly required, to the
Company. Such instrument or instruments (and the action embodied therein and
evidenced thereby) are herein sometimes referred to as the "Act" of the Holders
signing such instrument or instruments. Proof of execution of any such
instrument or of a writing appointing any such agent shall be sufficient for


                                      -7-
<PAGE>   14
any purpose of this Indenture and (subject to Section 6.1) conclusive in favor
of the Trustee and the Company, if made in the manner provided in this Section.

                  (b)      The fact and date of the execution by any person of
any such instrument or writing may be proved by the affidavit of a witness of
such execution or by a certificate of a notary public or other officer
authorized by law to take acknowledgments of deeds, certifying that the
individual signing such instrument or writing acknowledged to him the execution
thereof. Where such execution is by a signer acting in a capacity other than his
individual capacity, such certificate or affidavit shall also constitute
sufficient proof of his authority. The fact and date of the execution of any
such instrument or writing, or the authority of the Person executing the same,
may also be proved in any other manner which the Trustee deems sufficient.

                  (c)      The ownership of Securities shall be proved by the
Security Register.

                  (d)      Any request, demand, authorization, direction,
notice, consent, waiver or other Act of the Holder of any Security shall bind
every future Holder of the same Security and the Holder of every Security issued
upon the registration of transfer thereof or in exchange therefor or in lieu
thereof in respect of anything done, omitted or suffered to be done by the
Trustee or the Company in reliance thereon, whether or not notation of such
action is made upon such Security.

         1.5.     Notices, Etc., to Trustee and Company.

                  Any request, demand, authorization, direction, notice,
consent, waiver or other Act of Holders or other document provided or permitted
by this Indenture to be made upon, given or furnished to, or filed with,

                  (a)      The Trustee by any Holder or by the Company shall be
sufficient for every purpose hereunder if made, given, furnished or filed in
writing (which may be via facsimile) to or with the Trustee at its Corporate
Trust Office, or

                  (b)      The Company by the Trustee or by any Holder shall be
sufficient for every purpose hereunder (unless otherwise herein expressly
provided) if in writing and mailed, first-class postage prepaid, to the Company
addressed to the attention of its Secretary at 106 Charles Lindbergh Boulevard,
Uniondale, New York 11553 or at any other address previously furnished in
writing to the Trustee by the Company.

         1.6.     Notice to Holders; Waiver.

                  (a)      Where this Indenture provides for notices to Holders
of any event, such notice shall be sufficiently given (unless otherwise herein
expressly provided) if in writing and mailed, first-class postage prepaid, to
each Holder affected by such event, at his address as it appears in the Security
Register, not later than the latest date, and not earlier than the earliest
date, prescribed for the giving of such notice. In any case where notice to
Holders is given by mail, neither the failure to mail such notice, nor any
defect in any notice so mailed, to any particular Holder shall affect the
sufficiency of such notice with respect to other Holders. Where


                                      -8-
<PAGE>   15
this Indenture provides for notice in any matter, such notice may be waived in
writing by the Person entitled to receive such notice, either before or after
the event, and such waiver shall be the equivalent of such notice. Waivers of
notice by Holders shall be filed with the Trustee, but such filing shall not be
a condition precedent to the validity of any action taken in reliance upon such
waiver.

                  (b)      In any case by reason of the suspension of regular
mail service or by reason of any other cause it shall be impracticable to give
such notice by mail, then such notification as shall be made with the approval
of the Trustee shall constitute a sufficient notification of every purpose
hereunder.

         1.7.     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 Indenture by
any of the provisions of the Trust Indenture Act, such required provision shall
control.

         1.8.     Effect of Headings and Table of Contents.

                  The Article and Section headings herein and the Table of
Contents are for convenience only and shall not affect the construction hereof.

         1.9.     Successors and Assigns.

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

         1.10.    Separability Clause.

                  In case any provision in this Indenture or in the Securities
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.

         1.11.    Benefits of Indenture.

                  Nothing in this Indenture or in the Securities, express or
implied, shall give to any Person, other than the parties hereto and their
successors hereunder and the Holders, any benefit or any legal or equitable
right, remedy or claim under this Indenture.

         1.12.    Governing Law.

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


                                      -9-
<PAGE>   16
         1.13.    Legal Holidays.

                  In any case where the due date of interest on or principal of
any Security or the Redemption Date of any Security shall not be a Business Day,
then (notwithstanding any other provision of this Indenture or of the
Securities) payment of interest or principal (and premium, if any) 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 due date or Redemption Date; provided
that no interest shall accrue for the period from and after such prior date.

2.       SECURITY FORMS

         2.1.     Forms Generally.

                  (a)      The Securities of each series and the Trustee's
certificate of authentication shall be in substantially the form set forth in
this Article (except that the Notes shall be substantially in the form set forth
in Exhibit 1 hereto), with the Trustee's certificate of authentication on the
face of the Security, or in such other form as shall be established by or
pursuant to a Board Resolution or in one or more indentures supplemental hereto,
in each case with such appropriate insertions, omissions, substitutions and
other variations as are required or permitted by this Indenture, and may have
such letters, numbers or other marks of identification and such legends or
endorsements placed thereon as may be required to comply with any law or with
any rules made pursuant thereto or with any rules of any securities exchange or
as may, consistently herewith, be determined by the officers executing such
Securities to be necessary or appropriate, as evidenced by their execution of
the Securities.

                  (b)      The definitive Securities shall be printed,
lithographed or engraved on steel engraved borders or may be produced in any
other manner, all as determined by the officers executing such Securities, as
evidenced by their execution of such Securities.

         2.2.     Form of Face of Security.

                 Number [      ]                         $[      ]

                  [Title of the Series of the Security] -- [ ]%

                            OSI PHARMACEUTICALS, INC.

                                 Due____________

                                                             CUSIP No. [ ]

                  OSI Pharmaceuticals, Inc., a corporation duly organized and
existing under the laws of the State of Delaware (herein referred to as the
"Company"), for value received, hereby promises to pay to
______________________________, or ______ registered assigns, the principal sum
of _____________________, at the office or agency of the Company maintained for
that purpose in ______________________, on ____________, 19____ (the "Due
Date"), in 


                                      -10-
<PAGE>   17
such coin or currency of the United States of America as at the time of payment
shall be legal tender for the payment of public and private debts, and to pay
interest, on each Interest Payment Date (as defined herein) on said principal
sum at said office or agency, in like coin or currency, at the rate per annum
specified in the title of this [indebtedness] from the Interest Payment Date
next preceding the date of this [indebtedness] to which interest has been paid
or duly provided for unless the date thereof is a date to which interest has
been paid or duly provided for, in which case from the date of this
[indebtedness], or unless no interest has been paid or duly provided for on the
[indebtedness] since the Original Issue Date (as defined in the Indenture
referred to on the reverse hereto) of this [indebtedness] then from such
Original Issue Date until payment of said principal sum has been made or duly
provided for. The interest so payable on any Interest Payment Date will, subject
to certain exceptions provided in the Indenture, be paid to the person in whose
name this [indebtedness] is registered at the close of business on the fifteenth
day preceding such Interest Payment Date (the "Record Date" corresponding to
such Interest Payment Date), whether or not such Interest Payment Date is a
business day, and may, at the option of the Company, be paid by check mailed to
the registered address of such person. Notwithstanding the foregoing, if the
date hereof is after the Record Date corresponding to an Interest Payment Date
and before such Interest Payment Date, this [indebtedness] shall bear interest
from such Interest Payment Date. An "Interest Payment Date" shall be the
________ and _________ of each year until the principal hereof is paid or made
available for payment and the Due Date.

                  [This indebtedness may be redeemed by the Company at any time
in accordance with the provisions therefore in the Indenture, for a payment in
cash equal to [ ]% of the then outstanding principal sum, plus accrued and
unpaid interest to the Redemption Date.]

                  Reference is made to the further provisions of this
[indebtedness] set forth on the reverse hereto. Such further provisions shall
for all purposes have the same effect as though fully set forth at this place.

                  This [indebtedness] shall not be valid or become obligatory
for any purpose until the certificate of authentication hereon shall have been
signed by or on behalf of the Trustee under such Indenture.


                                      -11-
<PAGE>   18
                  IN WITNESS WHEREOF, OSI Pharmaceuticals, Inc. has caused this
instrument to be executed in its corporate name by the facsimile signatures of
its Chief Executive Officer, its President or one of its Vice Presidents and
attested by its Secretary or one of its Assistant Secretaries and impressed or
imprinted with its corporate seal or a facsimile thereof.

Dated:                                   OSI PHARMACEUTICALS, INC.


[SEAL]                                   By_____________________________________
                                                Title:
ATTEST:


_____________________________________
Title:

         2.3.     Form of Reverse Side of Security.

                            OSI PHARMACEUTICALS, INC.

                  [Title of the Series of the Security] -- [ ]%

                  This [indebtedness] is one of a duly authorized issue of
debentures, notes or other evidences of indebtedness of the Company (hereinafter
called the "Securities") of the series hereinafter specified, all issued or to
be issued under and pursuant to an indenture dated as of January 6, 1999 (herein
called the "Indenture"), duly executed and delivered by the Company to The Bank
of New York, Trustee (herein called the "Trustee"), to which Indenture and all
indentures supplemental thereto reference is hereby made for a description of
the rights, limitations of rights, obligations, duties and immunities thereunder
of the Trustee, the Company and Holders of the Securities. The Securities may be
issued in one or more series, which different series may be issued in various
aggregate principal amounts, may as between different series and within a given
series mature at different times, may bear interest (if any) at different rates,
may be subject to different redemption provisions (if any), may be subject to
different sinking, purchase or analogous funds (if any), and may otherwise vary
as the Indenture provides. This [indebtedness] is one of a series designated as
the [title of the series of the Security] -- [ ]% of the Company (hereinafter
called the ["indebtedness"], limited in aggregate principal amount to [ ].

                  Interest on the [indebtedness] shall be calculated on the
basis of a 360-day year consisting of twelve 30-day months.

                  [Description of provisions of the series relating to
redemption, sinking funds, subordination or other permitted terms, if any.]


                                      -12-
<PAGE>   19
                  If an Event of Default, as defined in the Indenture, with
respect to the [indebtedness] shall occur and be continuing, the principal of
the [indebtedness] may be declared due and payable in the manner and with the
effect provided in the Indenture.

                  The Indenture 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 Holders of not less than 80% in principal
amount of the Securities at the time Outstanding (as that term is defined in the
Indenture) of each series to be affected. The Indenture also contains provisions
permitting the Holders of 80% in aggregate 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 [indebtedness]
shall be conclusive and binding upon such Holder and upon all future Holders of
this [indebtedness] and of any Security issued upon the registration of transfer
hereof or in exchange hereof or in lieu hereof, whether or not notation of such
consent or waiver is made upon this [indebtedness].

                  No reference herein to the Indenture and no provision of this
[indebtedness] or of the Indenture shall alter or impair the obligation of the
Company, which is absolute and unconditional, to pay the principal of (and
premium, if any) and interest on this [indebtedness] at the times, place and
rate, and in the coin or currency, herein prescribed.

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

                  The [indebtedness] are issuable only in registered form
without coupons in denominations of [$10] and any integral multiple thereof. As
provided in the Indenture and subject to certain limitations therein set forth
the [indebtedness] are exchangeable for a like aggregate principal amount of
[indebtedness] 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.

                  Prior to due presentment of this [indebtedness] 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 [indebtedness] is
registered as the owner hereof for all purposes, whether or not 


                                      -13-
<PAGE>   20
this [indebtedness] is overdue, and neither the Company, the Trustee nor any
such agent shall be affected by notice to the contrary.

                  All capitalized terms used in this [indebtedness] and not
defined herein shall have the meanings assigned to them in the Indenture.

                  This [indebtedness] shall be deemed to be a contract made
under the laws of the State of New York, and for all purposes shall be construed
in accordance with and governed by the laws of such state.

         2.4.     Form of Trustee's Certificate of Authentication.

                  This is one of the Securities of the series designated
pursuant to the within-mentioned Indenture.

THE BANK OF NEW YORK,                    THE BANK OF NEW YORK,
     as Trustee                               as Trustee

                                       OR

By_____________________________________  By_____________________________________
         Authorized Signatory                    As Authenticating Agent


                                         By_____________________________________
Dated:_________________________________           Authorized Signatory

                                         Dated:_________________________________


                                      -14-
<PAGE>   21
3.       THE SECURITIES

         3.1.     Amount Unlimited; Issuable in Series.

                  (a)      The aggregate principal amount of Securities which
may be authenticated and delivered under this Indenture is unlimited.

                  (b)      The Securities may be issued in one or more series.
There shall be established in or pursuant to a Board Resolution, and set forth
in an Officers' Certificate, or established in one or more indentures
supplemental hereto, prior to the initial issuance of Securities of any series:

                           (i)      the title of the Securities, including CUSIP
         Numbers, of the series (which shall distinguish the Securities of the
         series from all other Securities);

                           (ii)     any limit upon the aggregate principal
         amount of the Securities of the series which may be authenticated and
         delivered under this Indenture (except for Securities authenticated and
         delivered upon registration of transfer of, or in exchange for, or in
         lieu of, other Securities of the series pursuant to Section 3.4, 3.5,
         3.6, 9.6 or 11.7);

                           (iii)    the date or dates on which the principal of
         the Securities of the series is payable;

                           (iv)     the rate or rates at which the Securities of
         the series shall bear interest, if any, the date or dates from which
         such interest shall accrue and the dates on which such interest shall
         be payable and the record date for the interest payable on any such
         interest date;

                           (v)      the place or places, if any, in addition to
         Uniondale, New York where the principal of (and premium, if any) and
         interest on Securities of the series shall be payable;

                           (vi)     the period or periods within which, the
         price or prices at which and the terms and conditions upon which
         Securities of the series may be redeemed, in whole or in part, at the
         option of the Company;

                           (vii)    the obligation, if any, of the company to
         redeem, purchase or repay Securities of the series pursuant to any
         sinking fund or analogous provisions or at the option of a Holder
         thereof and the period or periods within which, the price or prices at
         which and the terms and conditions upon which Securities of the series
         shall be redeemed or purchased or repaid, in whole or in part, pursuant
         to such obligation;

                           (viii)   if other than denominations of $1,000 and
         any integral multiple thereof (except that the Notes may be issuable in
         denominations of $10 and any 


                                      -15-
<PAGE>   22
         integral multiple thereof), the denominations in which Securities of
         the series shall be issuable;

                           (ix)     if other than the principal amount thereof,
         the portion of the principal amount of Securities of the series which
         shall be payable upon declaration of acceleration of the maturity
         thereof pursuant to Section 5.2;

                           (x)      the Indebtedness of the Company, if any,
         which shall constitute Senior Indebtedness with respect to the
         Securities of the series and the terms and conditions of that
         subordination; and

                           (xi)     any other terms of the series (which terms
         shall not be inconsistent with the provisions of this Indenture).

                  (c)      All Securities of any one series shall be
substantially identical except as to denomination and except as may otherwise be
provided in or pursuant to such Board Resolution in any such indenture
supplemental hereto.

                  (d)      At the option of the Company, interest on the
Securities of any series that bears interest may be paid by mailing a check to
the address of the Person entitled thereto as such address shall appear in the
Security Register.

                  (e)      If any of the terms of the series are established by
action taken pursuant to a Board Resolution, a copy of an appropriate record of
such action shall be certified by the Secretary or an Assistant Secretary of the
Company and delivered to the Trustee at or prior to the delivery of the
Officers' Certificate setting forth the terms of the series.

         3.2.     Denominations.

                  The Securities of each series shall be issuable in registered
form without coupons in such denominations as shall be specified as contemplated
by Section 3.1. In the absence of any such provisions with respect to the
Securities of any series, the Securities of such series shall be issuable in
denominations of $1,000 and any integral multiple thereof, except that the Notes
may be issuable in denominations of $10 and any integral multiple thereof.

         3.3.     Execution, Authentication, Delivery and Dating.

                  (a)      The Securities shall be executed on behalf of the
Company by its Chairman of the Board, its President or one of its Vice
Presidents and attested by its Secretary or one of its Assistant Secretaries.
The signature of any of these officers of the Securities may be manual or
facsimile.

                  (b)      Securities bearing the manual or facsimile signatures
of individuals who were at any time the proper officers of the Company shall
bind the Company, notwithstanding that such individuals or any of them have
ceased to hold such offices prior to the authentication and delivery of such
Securities or did not hold such offices at the date of such Securities.


                                      -16-
<PAGE>   23
                  (c)      At any time and from time to time after the execution
and delivery of this Indenture, the Company may deliver Securities of any series
executed by the Company to the Trustee for authentication, together with a
Company Order for the authentication and delivery of such Securities, and the
Trustee in accordance with the Company Order and subject to the provisions
hereof shall authenticate and deliver such Securities. If the Form or terms of
the Securities of the Series have been established in or pursuant to one or more
Board Resolutions as permitted by Sections 2.1 and 3.1, in authenticating such
Securities, and accepting the additional responsibilities under this Indenture
in relation to such Securities, the Trustee shall be entitled to receive, and
(subject to Section 6.1) shall be fully protected in conclusively relying upon,
an Opinion of Counsel stating:

                           (i)      if the form of such Securities has been
         established by or pursuant to Board Resolution as permitted by Section
         2.1, that such form has been established in conformity with the
         provisions of this Indenture;

                           (ii)     if the terms of such Securities have been
         established by or pursuant to Board Resolution as permitted by Section
         3.1, that such terms have been established in conformity with the
         provisions of this Indenture; and

                           (iii)    that such Securities, when authenticated and
         delivered by the Trustee and issued by the Company in the manner and
         subject to any conditions specified in such Opinion of Counsel, will
         constitute valid and legally binding obligations of the Company,
         enforceable in accordance with their terms, subject to bankruptcy,
         insolvency, fraudulent conveyance, reorganization and other laws of
         general applicability relating to or affecting the enforcement of
         creditors' rights and to general equity principles.

         (d)      The Trustee shall not be required to authenticate such
Securities if the issue of such Securities pursuant to this Indenture will
affect the Trustee's own rights, duties or immunities under the Securities and
this Indenture or otherwise be in a manner which is not reasonably acceptable to
the Trustee.

         (e)      Each Security shall be dated the date of its authentication.

         (f)      No Security shall be entitled to any benefit under this
Indenture or be valid or obligatory for any purpose unless there appears on such
Security a certificate of authentication substantially in the form provided for
herein executed by the Trustee by manual signature, and such certificate upon
any Security shall be conclusive evidence, and the only evidence, that such
Security has been duly authenticated and delivered hereunder and is entitled to
the benefits of this Indenture.


                                      -17-
<PAGE>   24
         3.4.     Temporary Securities.

                  (a)      Pending the preparation of definitive Securities of
any series, the Company may execute, and upon Company Order the Trustee shall
authenticate and delivery, temporary Securities which are printed, lithographed,
typewritten, mimeographed or otherwise produced, in any authorized denomination,
substantially of the tenor of the definitive Securities in lieu of which they
are issued and with such appropriate insertions, omissions, substitutions and
other variations as the officers executing such Securities may determine, as
evidenced by their execution of such Securities.

                  (b)      If temporary Securities of any series are issued, the
Company will cause definitive Securities of that series to be prepared without
unreasonable delay. After the preparation of definitive Securities of such
Series, the temporary Securities of such series shall be exchangeable for
definitive Securities of such series upon surrender of the temporary Securities
of such series at the office or agency of the Company designated by the Company
for that series, without charge to the Holder. Upon surrender for cancellation
of any one or more temporary Securities of any series the Company shall execute
and the Trustee shall authenticate and deliver in exchange therefor a like
principal amount of definitive Securities of the same series of authorized
denominations. Until so exchanged the temporary Securities of any series shall
in all respects be entitled to the same benefits under this Indenture as
definitive Securities of such series.

         3.5.     Registration, Registration of Transfer and Exchange.

                  (a)      The Company shall cause to be kept at an office or
agency of the Company a register (the "Security Register") in which, subject to
such reasonable regulations as it may prescribe, the Company shall provide for
the registration of Securities and transfers of Securities. The Trustee is
hereby initially appointed "Security Registrar" for the purpose of registering
Securities and transfers of Securities as herein provided.

                  (b)      Upon surrender for registration of transfer of any
Security of any series at the office or agency designated by the Company for
that series, the Company shall execute, and the Trustee shall authenticate and
deliver, in the name of the designated transferee or transferees, one or more
new Securities of the same series, of any authorized denominations and of a like
aggregate principal amount.

                  (c)      At the option of the Holder, Securities of any series
may be exchanged for other Securities of the same series, of any authorized
denominations and of a like aggregate principal amount, upon surrender of the
Securities to be exchanged at such office or agency. Whenever any Securities are
so surrendered for exchange. Whenever any Securities are so surrendered for
exchange, the Company shall execute, and the Trustee shall authenticate and
deliver, the Securities which the Holder making the exchange is entitled to
receive.

                  (d)      All Securities issued upon any registration of
transfer or exchange of Securities shall be the valid obligations of the
Company, evidencing the same debt, and entitled 


                                      -18-
<PAGE>   25
to the same benefits under this Indenture, as the Securities surrendered upon
such registration of transfer or exchange.

                  (e)      Every Security presented or surrendered for
registration of transfer or exchange shall (if so required by the Company or the
Trustee) be duly endorsed, or be accompanied by a written instrument of transfer
in form satisfactory to the Company and any Security Registrar with respect to
such series of Securities duly executed, by the Holder thereof or his attorney
duly authorized in writing.

                  (f)      No service charge shall be made for any registration
of transfer or exchange of Securities, but the Company may require payment of a
sum sufficient to cover any tax or other governmental charge that may be imposed
in connection with any registration of transfer or exchange of Securities, other
than exchanges pursuant to Section 3.4, 9.6 or 11.7 not involving any transfer.

                  (g)      The Company shall not be required:

                           (i)      to issue, register the transfer of or
         exchange Securities of any series during a period beginning at the
         opening of business 15 days before the day of the mailing of a notice
         of redemption of Securities of that series selected for redemption
         under Section 11.3 and ending at the close of business on the day of
         such mailing, or

                           (ii)     to register the transfer of or exchange any
         Security so selected for redemption in whole or in part, except the
         unredeemed portion of any Security being redeemed in part.

                  (h)      Each Holder of a Security agrees to indemnify the
Company and the Trustee against any liability that may result from the transfer,
exchange or assignment of such Holder's Security in violation of any provision
of this Indenture and/or applicable United States federal or state securities
law.

                  (i)      The Trustee shall have no obligation or duty to
monitor, determine or inquire as to compliance with any restrictions on transfer
imposed under this Indenture or under applicable law with respect to any
transfer of any interest in any Security other than to require delivery of such
certificates and other documentation or evidence as are expressly required by,
and to do so if and when expressly required by the terms of, this Indenture, and
to examine the same to determine substantial compliance as to form with the
express requirements hereof.

         3.6.     Mutilated, Destroyed, Lost and Stolen Securities.

                  (a)      If any mutilated Security is surrendered to the
Company or to the Trustee, the Company shall execute and the Trustee shall
authenticate and deliver in exchange therefor a new Security of the same series
and of like tenor and principal amount and bearing a number not
contemporaneously outstanding.


                                      -19-
<PAGE>   26
                  (b)      If there shall be delivered to the Company and the
Trustee (i) evidence to their satisfaction of the destruction, loss or theft of
any Security and (ii) such security or indemnity as may be required by either of
them to save each of them and any agent of either of them harmless, then, in the
absence of notice to the Company or the Trustee that such Security has been
acquired by a bona fide purchaser, the Company shall execute and upon its
request the Trustee shall authenticate and deliver, in lieu of any such
destroyed, lost or stolen Security, a new Security of the same series and of
like tenor and principal amount and bearing a number not contemporaneously
outstanding.

                  (c)      In case any such mutilated, destroyed, lost or stolen
Security has become or is about to become due and payable, the Company in its
discretion may, instead of issuing a new Security, pay such Security.

                  (d)      Upon the issuance of any new Security under this
Section, the Company may require the payment of a sum sufficient to cover any
tax or other governmental charge that may be imposed in relation thereto and any
other expenses (including the fees and expenses of the Trustee) connected
therewith.

                  (e)      Every new Security of any series issued pursuant to
this Section in lieu of any destroyed, lost or stolen Security shall constitute
an original additional contractual obligation of the Company, whether or not the
destroyed, lost or stolen Security shall be at any time enforceable by anyone,
and shall be entitled to all the benefits of this Indenture equally and
proportionately with any and all other securities of that series duly issued
hereunder.

                  (f)      The provisions of this Section are exclusive and
shall preclude (to the extent lawful) all other rights and remedies with respect
to the replacement or payment of mutilated, destroyed, lost or stolen
Securities.

         3.7.     Payment of Interest; Interest Rights Preserved.

                  (a)      Interest on any Security which is payable, and is
punctually paid or duly provided for, on any interest payment date shall be paid
to the Person in whose name that Security (or one or more Predecessor
Securities) is registered at the close of business on the record date (as
hereinafter defined) for such interest payment notwithstanding the cancellation
of such Security upon the registration of transfer or exchange subsequent to the
record date and prior to such interest payment date; provided, however, that if
and to the extent that the Company shall default in the payment of the interest
due on such interest payment date, such defaulted interest shall be paid to the
Persons in whose names outstanding Securities are registered at the close of
business on a subsequent record date established by notice given by mail by and
on behalf of the Company to the Holders of Securities not less than 15 days
preceding such subsequent record date, such record date to be not less than 10
days preceding the date of payment of such defaulted interest. The term "record
date" as used in this Section 3.7 with respect to any regular interest payment
date as may have been established as the record date with respect to an interest
payment date for Securities of such series in a Board Resolution in accordance
with Section 3.1 hereof. The Company may also make payment of any defaulted
interest in any other lawful manner not inconsistent with the requirements of
any securities 


                                      -20-
<PAGE>   27
exchange on which the Securities may be listed, and upon such notice as may be
required by such exchange if, after notice given by the Company to the Trustee
of the proposed payment pursuant to this sentence, such manner of payment shall
be deemed practicable by the Trustee.

                  (b)      Subject to subsection (a) of this Section, each
Security delivered under this Indenture upon transfer of or in exchange for or
in lieu of any other Security shall carry the rights to interest accrued and
unpaid, and to accrue, which were carried by such other Security.

         3.8.     Persons Deemed Owners.

                  Prior to due presentment of a Security for registration of
transfer, the Company, the Trustee and any agent of the Company or the Trustee
may treat the Person in whose name such Security is registered as the owner of
such Security for the purpose of receiving payment of principal of (and premium,
if any) and (subject to Section 3.7) interest on such Security and for all other
purposes whatsoever, whether or not such Security be overdue, and neither the
Company, the Trustee nor any agent of the Company or the Trustee shall be
affected by notice to the contrary.

         3.9.     Cancellation.

                  All Securities surrendered for payment, redemption,
registration of transfer or exchange or for credit against any sinking fund
payment shall, if surrendered to any Person other than the Trustee, be delivered
to the Trustee and shall be promptly cancelled by it; provided, however, that if
surrendered to any Authenticating Agent, such Securities shall be promptly
cancelled by such Authenticating Agent and forwarded to the Trustee. The Company
may at any time deliver to the Trustee for cancellation any Securities
previously authenticated and delivered hereunder which the Company may have
acquired in any manner whatsoever, and all Securities so delivered shall be
promptly cancelled by the Trustee. No Securities shall be authenticated in lieu
of or in exchange for any Securities cancelled as provided in this Section,
except as expressly permitted by this Indenture. All cancelled Securities held
by the Trustee shall be disposed of as directed by a Company Order; provided,
that the Trustee shall not be required to dispose of Securities in a manner
deemed impracticable by the Trustee.

         3.10.    Computation of Interest.

                  Except as otherwise specified as contemplated by Section 3.1
for Securities of any series, interest on the Securities of each series shall be
computed on the basis of a 360-day year of twelve 30-day months.

         3.11.    CUSIP Numbers.

                  The Company in issuing the Securities may use "CUSIP" numbers
(if then generally in use), and, if so, the Trustee shall use "CUSIP" numbers in
notices of redemption as a convenience to Holders; provided that any such notice
may state that no representation is made as to the correctness of such numbers
either as printed on the Securities or as contained in any notice of a
redemption and that reliance may be placed only on the other identification
numbers 


                                      -21-
<PAGE>   28
printed on the Securities, and any such redemption shall not be affected
by any defect in or omission of such numbers. The Company will promptly notify
the Trustee of any change in the "CUSIP" numbers.

4.       SATISFACTION AND DISCHARGE

         4.1.     Satisfaction and Discharge of Indenture.

                  (a)      This Indenture shall, upon Company Request, cease to
be of further effect (except as to any surviving rights of registration of
transfer or exchange of Securities herein expressly provided for), and the
Trustee, at the expense of the Company, shall execute proper instruments
acknowledging satisfaction and discharge of this Indenture, when:

                           (i)      either

                                    (A)      All Securities theretofore
                  authenticated and delivered (other than (1) Securities which
                  have been destroyed, lost or stolen and which have been
                  replaced or paid as provided in Section 3.6 and (2) Securities
                  for whose payment money has theretofore been deposited in
                  trust and thereafter discharged from such trust, as provided
                  in Section 10.3) have been delivered to the Trustee for
                  cancellation; or

                                    (B)      all such Securities not theretofore
                  delivered to the Trustee for cancellation

                                             (1)      have become due or 
                           payable, or

                                             (2)      will become due and 
                           payable at their stated maturity within one year, or

                                             (3)      are to be called for 
                           redemption within one year under arrangements
                           satisfactory to the Trustee for the giving of notice
                           of redemption by the Trustee in the name, and at the
                           expense, of the Company, and the Company, in the case
                           of (1), (2) or (3) above, has deposited or caused to
                           be deposited with the Trustee as trust funds in trust
                           for the purpose an amount sufficient to pay and
                           discharge the entire indebtedness on such Securities
                           not theretofore delivered to the Trustee for
                           cancellation, for principal (and premium, if any) and
                           interest to the date of such deposit (in the case of
                           Securities which have become due and payable) or to
                           the stated maturity or Redemption Date, as the case
                           may be;

                           (ii)     the Company has paid or caused to be paid
         all other sums payable hereunder by the Company; and


                                      -22-
<PAGE>   29
                           (iii)    the Company has delivered to the Trustee an
         Officers' Certificate and an Opinion of Counsel, each stating that all
         conditions precedent herein provided for relating to the satisfaction
         and discharge of this Indenture have been complied with.

                  (b)      In the event there are Securities of two or more
series hereunder, the Trustee shall be required to execute an instrument
acknowledging satisfaction and discharge of this Indenture only if requested to
do so with respect to Securities of all series as to which it is Trustee and if
the other conditions thereto are met. In the event there are two or more
Trustees hereunder, then the effectiveness of any such instrument shall be
conditioned upon the receipt of such instruments from all Trustees hereunder.

                  (c)      Notwithstanding the satisfaction and discharge of
this Indenture, the obligations of the Company to the Trustee under Section 6.7,
the obligations of the Trustee to any Authenticating Agent under Section 6.14
and, if money shall have been deposited with the Trustee pursuant to Subclause
(B) of Clause (i) of this Section, the obligations of the Trustee under Section
4.2 and the last paragraph of Section 10.3, shall survive such satisfaction and
discharge.

         4.2.     Application of Trust Money.

                  Subject to the provisions of the last paragraph of Section
10.3, all money deposited with the Trustee pursuant to Section 4.1 shall be held
in trust and applied by it, in accordance with the provisions of the Securities
and this Indenture, to the payment, either directly or through any Paying Agent
as the Trustee may determine, to the Persons entitled thereto, of the principal
(and premium, if any) and interest for whose payment such money has been
deposited with the Trustee.

5.       REMEDIES

         5.1.     Events of Default.

                  "Event of Default" wherever used herein with respect to
Securities of any series, means any one of the following events (whatever the
reason for such Event of Default and whether it shall be voluntary or
involuntary or be effected by operation of law or pursuant to any judgment,
decree or order of any court or any order, rule or regulation of any
administrative or governmental body):

                  (a)      default in the payment of any interest upon any
Security of that series when it becomes due and payable, and continuance of such
default for a period of 5 days; or

                  (b)      default in the payment of the principal of (or
premium, if any, on) any Security of that series when due and payable as therein
or herein provided whether at its maturity or upon acceleration, redemption or
otherwise; or


                                      -23-
<PAGE>   30
                  (c)      default in the deposit of any sinking fund payment,
when and as due by the terms of a Security of that series; or

                  (d)      default in the performance, or breach, of any
covenant or warranty of the Company contained in this Indenture in the terms of
the Securities of that series (other than a covenant or warranty a default in
whose performance or whose breach is elsewhere in this Section specifically
dealt with or which has expressly been included in this Indenture solely for the
benefit of series of Securities other than that series), and continuance of such
default or breach for a period of 10 days after there has been given, by
registered or certified mail, to the Company by the Trustee or to the Company
and the Trustee by the Holders of at least 10% in principal amount of the
Outstanding Securities of that series a written notice specifying such default
or breach and requiring it to be remedied and stating that such notice is a
"Notice of Default" hereunder; or

                  (e)      a default under any mortgage, indenture, or
instrument under which there may be issued or by which there may be secured or
evidenced any indebtedness for money borrowed by the Company (including a
default with respect to Securities of any series other than that series) whether
such indebtedness now exists or shall hereafter be created, which default shall
have resulted in such indebtedness, in an aggregate principal amount exceeding
$1,000,000 becoming or being declared due and payable prior to the date on which
it would otherwise have become due an payable, without such indebtedness having
been discharged, or such acceleration having been rescinded or annulled, or
there having been deposited in trust a sum of money sufficient to discharge in
full such indebtedness, within a period of 10 days after there shall have been
given, by registered or certified mail, to the Company by the Trustee or to the
Company and the Trustee by the Holders of at least 10% in principal amount of
the Outstanding Securities of that series a written notice specifying such
default and requiring the Company to cause such indebtedness to be discharged,
to cause there to be deposited in trust a sum sufficient to discharge in full
such indebtedness or to cause such acceleration to be rescinded or annulled and
stating that such notice is a "Notice of Default" hereunder; provided, however,
that, subject to the provisions of Section 6.1 and 6.2, the Trustee shall not be
deemed to have knowledge of such default unless the Trustee shall have received
written notice thereof from the Company, from any Holder, from the holder of any
such indebtedness or from the trustee under any such mortgage, indenture or
other instrument; or

                  (f)      the entry by a court having jurisdiction in the
premises of

                           (i)      a decree or order for relief in respect of
         the Company in an involuntary case or proceeding under any applicable
         Federal or State bankruptcy, insolvency, reorganization or other
         similar law now or hereafter in effect; or

                           (ii)     a decree or order appointing a custodian,
         receiver, liquidator, assignee, trustee, sequestrator or other similar
         official of the company or of any substantial part of its property, or
         ordering the winding up or liquidation of its affairs, and the
         continuance of any such decree or order for relief or any such other
         decree or order unstayed and in effect for a period of 30 consecutive
         days; or


                                      -24-
<PAGE>   31
                  (g)      the commencement by the Company of a voluntary case
or proceeding under any applicable Federal or State bankruptcy, insolvency,
reorganization or other similar law now or hereafter in effect or of any other
case or proceeding to be adjudicated a bankrupt or insolvent, or the consent by
the Company to the entry of a decree or order for relief in an involuntary case
or proceeding under any applicable Federal or State bankruptcy, insolvency,
reorganization or other similar law now or hereafter in effect or to the
commencement of any bankruptcy or insolvency case or proceeding, or the filing
by the Company of a petition or answer or consent seeking reorganization or
relief under any applicable Federal or State law now or hereafter in effect, or
the consent by the Company to the filing of such petition or to the appointment
of or taking possession by a custodian, receiver, liquidator, assignee, trustee,
sequestrator or similar official of the Company or of any substantial part of
the property of the Company or the making by the Company of an assignment for
the benefit of creditors, or the Company shall fail generally to pay its debts
as they become due, or the taking of corporate action by the Company in
furtherance of any such action; or

                  (h)      any other Event of Default provided with respect to
Securities of that series.

                  (i)      Subject to Sections 6.1 and 6.2, and except for
Events of Default described in Sections 5.1(a), (b) and (c), the Trustee shall
not be deemed to have knowledge of an Event of Default unless a Responsible
Officer receives written notice thereof.

         5.2.     Acceleration of Maturity; Rescission and Annulment.

                  (a)      If an Event of Default with respect to Securities of
any series at the time Outstanding occurs and is continuing, then in every such
case the Trustee or the Holder of not less than 10% in principal amount of the
Outstanding Securities of that series may declare the principal amount and the
interest accrued thereon of all of the Securities of that series to be due and
payable immediately, by a notice in writing to the Company (and to the Trustee
if given by Holders), and upon any such declaration such principal amount (or
specified amount) and interest accrued thereon shall become immediately due and
payable.

                  (b)      At any time after such a declaration of acceleration
with respect to Securities of any series has been made and before a judgment or
decree for payment of the money due has been obtained by the Trustee as
hereinafter in this Article provided, the Holders of 80% in principal amount of
the Outstanding Securities of that series, by written notice to the Company and
the Trustee, may rescind and annul such declaration and its consequences if:

                           (i)      the Company has paid or deposited with the
         Trustee a sum sufficient to pay:

                                    (A)      all overdue interest on all
                  Securities of that series,

                                    (B)      the principal of (and premium, if
                  any, on), any Securities of that series which have become due
                  otherwise than by such declaration of 


                                      -25-
<PAGE>   32
                  acceleration and interest thereon at the rate or rates
                  prescribed therefor in such Securities,

                                    (C)      to the extent that payment of such
                  interest is lawful, interest upon overdue interest at the rate
                  or rates prescribed therefor in such Securities, and

                                    (D)      all sums paid or advanced by the
                  Trustee hereunder and the reasonable compensation, expenses
                  and disbursements and advances of the Trustee, its agents and
                  counsel; and

                           (ii)     all Events of Default with respect to
         Securities of that series, other than the non-payment of the principal
         of Securities of that series which have become due solely by such
         declaration of acceleration, have been cured or waived as provided in
         Section 5.13.

                  No such rescission shall affect any subsequent default or
impair any right consequent thereon.

         5.3.     Collection of Indebtedness and Suit for Enforcement by
                  Trustee.

                  (a)      The Company covenants that if:

                           (i)      default is made in the payment of any
         interest on any Security when such interest becomes due and payable and
         such default continues for a period of 5 days, or

                           (ii)     default is made in the payment of the
         principal of (or premium, if any, on) any Security at the maturity,
         redemption, acceleration or otherwise thereof or in the deposit of any
         sinking fund payment when and as due by the terms of any Security, the
         Company will, upon demand of the Trustee, pay to it, for the benefit of
         the Holders of such Securities, the whole amount then due and payable
         on such Securities for principal (and premium, if any) and interest,
         interest on any overdue principal (and premium, if any) and, to the
         extent that payment of such interest shall be legally enforceable,
         interest on any overdue interest, at the rate or rates prescribed
         therefor in such Securities, and, in addition thereto, such further
         amount as shall be sufficient to cover the costs and expenses of
         collection, including the reasonable compensation, expenses,
         disbursements and advances of the Trustee, its agents and counsel.

                  (b)      If the Company fails to pay such amounts forthwith
upon such demand, the Trustee, in its own name and as trustee of an express
trust and at the expense of the Company, may institute a judicial proceeding for
the collection of the sums so due and unpaid, may prosecute such proceeding to
judgment or final decree and may enforce the same against the Company or any
other obligor upon such Securities and collect the moneys adjudged or decreed


                                      -26-
<PAGE>   33
to be payable in the manner provided by law out of the property of the Company
or any other obligor upon such Securities, wherever situated.

                  (c)      If an Event of Default with respect to Securities of
any series occurs and is continuing, the Trustee may in its discretion proceed
to protect and enforce its rights and the rights of the Holders of Securities of
such series by such appropriate judicial proceedings as the Trustee shall deem
necessary to protect and enforce any such rights, whether for the specific
enforcement of any covenant or agreement in this Indenture or in aid of the
exercise of any power granted herein, or to enforce any other proper remedy.

         5.4.     Trustee May File Proofs of Claim.

                  (a)      In case of the pendency of any receivership,
insolvency, liquidation, bankruptcy, reorganization, arrangement, adjustment,
composition or other similar judicial proceeding relative to the Company or any
other obligor upon the Securities or the property of the Company or of such
other obligor or their creditors, the Trustee (irrespective of whether the
principal of the Securities shall then be due and payable as therein expressed
or by declaration or otherwise and irrespective of whether the Trustee shall
have made any demand on the Company for the payment of overdue principal or
interest) shall be entitled and empowered by intervention in such proceeding or
otherwise:

                           (i)      to file and prove a claim for the whole
         amount of principal (and premium, if any) and interest owing and unpaid
         in respect of the Securities and to file such other papers or documents
         as may be necessary or advisable in order to have the claims of the
         Trustee (including any claim for the reasonable compensation, expenses,
         disbursements and advances of the Trustee, its agents and counsel) and
         of the Holders allowed in such judicial proceeding;

                           (ii)     to collect and receive any moneys or other
         property payable or deliverable on any such claims; and

                           (iii)    to distribute all amounts received with
         respect to the claims of the Holders and the Trustee on their behalf,

and any custodian, receiver, assignee, trustee, liquidator, sequestrator or
other similar official in any such judicial proceeding is hereby authorized by
each Holder to make such payments to the Trustees and, in the event that the
Trustee shall consent to the making of such payments directly to the Holders, to
pay to the Trustee any amount due it for the reasonable compensation, expenses,
disbursements and advances of the Trustee, its agents and counsel, and any other
amounts due the Trustee under Section 6.7.

                  (b)      Subject to the provisions of Article Eight of this
Indenture, nothing herein contained shall be deemed to authorize the Trustee to
authorize or consent to or accept or adopt on behalf of any Holder any plan of
reorganization, arrangement, adjustment or composition affecting the Securities
or the rights of any Holder thereof or to authorize the Trustee to vote in
respect of the claim of any Holder in any such proceeding.


                                      -27-
<PAGE>   34
         5.5.     Trustee May Enforce Claims Without Possession of Securities.

                  All rights of action and claims under this Indenture or the
Securities may be prosecuted and enforced by the Trustee without the possession
of any of the Securities or the production thereof in any proceeding relating
thereto, and any such proceeding instituted by the Trustee shall be brought in
its own name as trustee of an express trust, and any recovery of judgment shall,
after provision for the payment of the reasonable compensation, expenses,
disbursements and advances of the Trustee, its agents and counsel, be for the
ratable benefit of the Holders of the Securities in respect of which such
judgment has been recovered.

         5.6.     Application of Money Collected.

                  Any money collected by the Trustee pursuant to this Article
shall be applied in the following order, at the date or dates fixed by the
Trustee and, in case of the distribution of such money on account of principal
(or premium, if any) or interest, upon presentation of the Securities and the
notation thereon of the payment, if only partially paid and upon surrender
thereof if fully paid:

                  FIRST:   To the payment of all amounts due the Trustee under
Section 6.7;

                  SECOND:  To the Holders of Senior Indebtedness as provided in
Article Thirteen.

                  THIRD:   To the payment of the amounts then due and unpaid for
principal of (and premium, if any) and interest on the Securities in respect of
which or for the benefit of which such money has been collected, ratably,
without preference or priority of any kind, according to the amounts due and
payable on such Securities for principal (and premium, if any) and interest,
respectively.

                  FOURTH:  To the Company.

         5.7.     Limitation on Suits.

                  No Holder of any Security of any series shall have any right
to institute any proceeding, judicial or otherwise, with respect to this
Indenture, or for the appointment of a receiver or trustee, or for any other
remedy hereunder, unless:

                  (a)      such Holder has previously given written notice to
the Trustee of a continuing Event of Default with respect to the Securities of
that series;

                  (b)      the Holders of not less than 10% in principal amount
of Outstanding Securities of that series shall have made written request to the
Trustee to institute proceedings in respect of such Events of Default in its own
name as Trustee hereunder;


                                      -28-
<PAGE>   35
                  (c)      such Holder or Holders have offered to the Trustee
reasonable indemnity against the costs, expenses and liabilities to be incurred
in compliance with such request;

                  (d)      the Trustee for 10 days after its receipt of such
notice, request and offer of indemnity has failed to institute any such
proceeding; and

                  (e)      no direction inconsistent with such written request
has been given to the Trustee during such 20-day period by the Holders of a
majority in principal amount of the outstanding Securities of that series;

it being understood and intended that no one or more of Holders of Securities of
such series shall have any right in any manner whatever by virtue of, or by
availing of, any provision of this indenture to disturb or prejudice the rights
of any other Holder of Securities of such series or any Holder of any other
series, or to obtain or to seek to obtain priority or preference over any other
Holder of Securities of such series or to enforce any right under this
Indenture, except in the manner herein provided and for the equal and ratable
benefit of all Holders of Securities of such series.

         5.8.     Unconditional Rights of Holders to Receive Principal, Premium
                  and Interest.

                  Notwithstanding any other provision in this Indenture, the
Holder of any Security shall have the right, which is absolute and
unconditional, to receive payment of the principal of (and premium, if any) and
(subject to Section 3.7) interest on such Security on the due dates expressed in
such Security (or, in the case of redemption, on the Redemption Date) and to
institute suit for the enforcement of any such payment, and such rights shall
not be impaired without the consent of such Holder.

         5.9.     Restoration of Rights and Remedies.

                  If the Trustee or any Holder has instituted any proceeding to
enforce any right or remedy under this Indenture and such proceeding has been
discontinued or abandoned for any reason, or has been determined adversely to
the Trustee or to such Holder, then and in every such case, subject to any
determination in such proceeding, the Company, the Trustees and the Holders
shall be restored severally and respectively to their former positions hereunder
and thereafter all rights and remedies of the Trustee and the Holders shall
continue as though no such proceeding had been instituted.

         5.10.    Rights and Remedies Cumulative.

                  Except an otherwise provided with respect to the replacement
or payment of mutilated, destroyed, lost or stolen Securities in the last
paragraph of Section 3.6, no right or remedy herein conferred upon or reserved
to the Trustee or to the Holders is intended to be exclusive of any other right
or remedy, and every right and remedy shall, to the extent permitted by law, be
cumulative and in addition to every other right and remedy given hereunder or
now or hereafter existing at law or in equity or otherwise. The assertion or
employment of any right or 


                                      -29-
<PAGE>   36
remedy hereunder, or otherwise, shall not prevent the concurrent assertion or
employment of any other appropriate right or remedy.

         5.11.    Delay or Omission Not Waiver.

                  No delay or omission of the Trustee or of any Holder of any
Securities to exercise any right or remedy accruing upon any Event of Default
shall impair any such right or remedy or constitute a waiver of any such Event
of Default or an acquiescence therein. Every right and remedy given by this
Article or by law to the Trustee or to the Holders may be exercised from time to
time, and as often as may be deemed expedient, by the Trustee or by the Holders,
as the case may be.

         5.12.    Control by Holders.

                  The Holders of a majority in principal amount of the
outstanding Securities of any series shall have the right to direct the time,
method and place of conducting any proceeding for any remedy available to the
Trustee, or exercising any trust or power conferred on the Trustee, with respect
to the Securities of such series, provided, that:

                  (a)      such direction shall not be in conflict with any rule
of law or with this Indenture;

                  (b)      the Trustee shall have been provided with an Opinion
of Counsel stating that the action so directed would not be unjustly prejudicial
to the Holders of any Securities of any series with respect to which the Trustee
is the trustee not taking part in such direction; and

                  (c)      the Trustee may take any other action deemed proper
by the Trustee which is not inconsistent with such direction.

         5.13.    Waiver of Past Defaults.

                  (a)      The Holders of not less than 80% in principal amount
of the outstanding Securities of any series may on behalf of the Holders of all
the Securities of such series waive any past default hereunder with respect to
such series and its consequences, except a default:

                           (i)      in the payment of the principal of (or
         premium, if any) or interest on any Security of such series, or

                           (ii)     in respect of a covenant or provision hereof
         which under Article Ten cannot be modified or amended without the
         consent of the Holder of each Outstanding Security of such series
         affected.

                  (b)      Upon any such waiver, such default shall cease to
exist, and any Event of Default arising therefrom shall be deemed to have been
cured, for every purpose of this Indenture; but no such waiver shall extend to
any subsequent or other default or impair any right consequent thereon.


                                      -30-
<PAGE>   37
      5.14. Undertaking for Costs.

            All parties to this Indenture agree, and each Holder of any Security
by his acceptance thereof shall be deemed to have agreed, that any court may in
its discretion require, in any suit for the enforcement of any right or remedy
under this Indenture, or in any suit against the Trustee for any action taken,
suffered or omitted by it as Trustee, the filing by any party litigant in such
suit of an undertaking to pay the costs of such suit, and that such court may in
its discretion assess reasonable costs, including reasonable attorneys' fees and
expenses, against any party litigant in such suit, having due regard to the
merits and good faith of the claims or defenses made by such party litigant; but
the provisions of this Section shall not apply to any suit instituted by the
Trustee, to any suit instituted by the Trustee, to any suit instituted by any
Holder, or group of Holders, holding in the aggregate more than 10% in principal
amount of the Outstanding Securities of any series, or to any suit instituted by
any Holder for the enforcement of the payment of the principal of (or premium,
if any) or interest on any Security on or after the due dates expressed in such
Security (or, in the case of redemption, on or after the Redemption Date).

      5.15. Waiver of Stay or Extension Laws.

            The Company covenants (to the extent that it may lawfully do so)
that it will not at any time insist upon, or plead, or in any manner whatsoever
claim or take the benefit or advantage of, any stay or extension law wherever
enacted, now or at any time hereafter in force, which may affect the covenants
or the performance of this Indenture; and the Company (to the extent that it may
lawfully do so) hereby expressly waives all benefit or advantage of any such law
and covenants that it will not hinder, delay or impede the exercise of any power
herein granted to the Trustee, but will suffer and permit the exercise of every
such power as though no such law had been enacted.

6.    THE TRUSTEE

      6.1.  Certain Duties and Responsibilities.

            (a) Except during the continuance of an Event of Default with
respect to Securities of any series.

                  (i) the Trustee undertakes to perform, with respect to
            Securities of such series, specifically set forth in this Indenture,
            and no implied covenants or obligations shall be read into this
            Indenture against the Trustee; and

                  (ii) in the absence of bad faith on its part, the Trustee may,
            with respect to Securities of such series, conclusively rely, as to
            the truth of the statements and the correctness of the opinions
            expressed therein, upon certificates or opinions furnished to the
            Trustee and conforming to the requirements of this Indenture; but in
            the case of any such certificates or opinions which by any
            provisions hereof are specifically required to be furnished to the
            Trustee, the Trustee shall be under a duty to examine the same to
            determine whether or not 


                                      -31-
<PAGE>   38
            they conform to the requirements of this Indenture (but need not
            confirm or investigate the accuracy of any mathematical calculations
            or other facts stated therein).

            (b) If an Event of Default with respect to Securities of any series
has occurred and is continuing, the Trustee shall exercise, with respect to
Securities of such series, such of the rights and powers vested in it by this
Indenture, and use the same degree of care and skill in their exercise, as a
prudent man would exercise or use under the circumstances in the conduct of his
own affairs.

            (c) No provision of this Indenture shall be construed to relieve the
Trustee from liability for its own negligent action, its own negligent failure
to act, or its own willful misconduct, except that:

                  (i) this Subsection shall not be construed to limit the effect
            of Subsection (a) of this Section;

                  (ii) the Trustee shall not be liable for any error of judgment
            made in good faith by a Responsible Officer, unless it shall be
            proved that the Trustee was negligent in ascertaining the pertinent
            facts;

                  (iii) the Trustee shall not be liable with respect to any
            action taken or omitted to be taken by it in good faith in
            accordance with the direction of the Holders of a majority in
            principal amount of the Outstanding Securities of any series
            pursuant to the provisions of Section 5.12 relating to the time,
            method and place of conducting any proceeding for any remedy
            available to the Trustee, or exercising any trust or power conferred
            upon the Trustee, under this Indenture with respect to the
            Securities of such series; and

                  (iv) no provision of this Indenture shall require the Trustee
            to expend or risk its own funds or otherwise incur any financial
            liability in the performance of any of its duties hereunder, or in
            the exercise of any of its rights or powers, if it shall have
            reasonable grounds for believing that repayment of such funds or
            adequate indemnity against such risk or liability is not reasonably
            assured to it.

            (d) Whether or not therein expressly so provided, every provision of
this Indenture relating to the conduct or affecting the liability of or
affording protection to the Trustee shall be subject to the provisions of this
Section.

      6.2.  Notice of Defaults.

            Within 60 days after the occurrence of any default hereunder with
respect to the Securities of any series, the Trustee shall transmit by
first-class mail to all Holders of Securities of such series, as their names and
addresses appear in the Security Register, notice of such default hereunder
actually known to a Responsible Officer of the Trustee, unless such default
shall have been cured or waived; provided, however, that, except in the case of
a default in the 


                                      -32-
<PAGE>   39
payment of the principal of (or premium, if any) or interest on any Security of
such series or in the payment of any sinking fund installment with respect to
Securities of such series, the Trustee shall be protected in withholding such
notice if and so long as the board of directors, the executive committee or a
trust committee of directors or responsible officers of the Trustee in good
faith determine that the withholding of such notice is in the interest of the
Holders of Securities of such series; and provided, further, that in the case of
any default of the character specified in Section 5.1.(d) with respect to the
Securities of such series, no such notice to Holders shall be given until at
least 30 days after the occurrence thereof. For the purpose of this Section, the
term "default" means any event which is or after notice or lapse of time or both
would become, an Event of Default with respect to Securities of such series.

      6.3.  Certain Rights of Trustee.

            Subject to the provisions of Section 6.1:

            (a) the Trustee may conclusively rely and shall be fully protected
in acting or refraining from acting upon any resolution, certificate, statement,
instrument, opinion, report, notice, request, direction, consent, order, bond,
debenture, note, other evidence of indebtedness or other paper or document
(whether in its original or facsimile form) believed by it to be genuine and to
have been signed or presented by the proper party or parties;

            (b) any request or direction of the Company mentioned herein shall
be sufficiently evidenced by a Company Request or Company Order and any
resolution of the Board of Directors shall be sufficiently evidenced by a Board
Resolution;

            (c) however, in the administration of this Indenture the Trustee
shall deem it desirable that a matter be proved or established prior to taking,
suffering, or omitting any action hereunder, the Trustee (unless other evidence
be herein specifically prescribed) may, in the absence of bad faith on its part,
conclusively rely upon an Officer's Certificate;

            (d) the Trustee may consult with counsel of its own selection and
the advice of such counsel or any Opinion of Counsel shall be full and complete
authorization and protection in respect of any action taken, suffered or omitted
by it hereunder in good faith and in reliance thereon;

            (e) the Trustee shall be under no obligation to exercise any of the
rights or powers vested in it by this Indenture at the request or direction of
any of the Holders pursuant to this Indenture, unless such Holders shall have
offered to the Trustee security or indemnity satisfactory to it against the
costs, expenses and liabilities which might be incurred by it in compliance with
such request or direction;

            (f) the Trustee shall not be bound to make any investigation into
the facts or matters stated in any resolution, certificate, statement,
instrument, opinion, report, notice, request, direction, consent, order, bond,
debenture, note, other evidence of indebtedness or other paper or document, but
the Trustee, in its discretion, may make such further inquiry or investigation
into such facts or matters as it may see fit, and, if the Trustee shall
determine to 


                                      -33-
<PAGE>   40
make such further inquiry or investigation, it shall be entitled to examine the
books, records and premises of the Company, personally or by agent or attorney,
at the expense of the Company and shall incur no liability or additional
liability of any kind by reason of such inquiry or investigation;

            (g) the Trustee may execute any of the trusts or powers hereunder or
perform any duties hereunder either directly or by or through agents or
attorneys and the Trustee shall not be responsible for any misconduct or
negligence on the part of any agent or attorney appointed with due care by it
hereunder; and

            (h) the Trustee shall not be liable for any action taken, suffered
or omitted by it in good faith, believed by it to be authorized or within the
discretion or rights and powers conferred upon it by this Indenture.

            (i) the rights, privileges, protections, immunities and benefits
given to the Trustee, including, without limitation, its right to be
indemnified, are extended to, and shall be enforceable by, the Trustee in each
of its capacities hereunder, and to each agent, custodian and other Person
employed to act hereunder.

      6.4.  Not Responsible for Recitals or Issuance of Securities.

            The recitals contained herein and in the Securities, except the
Trustee's certificate of authentication, shall be taken as the statements of the
Company, and the Trustee or any Authenticating Agent assumes no responsibility
for their correctness. The Trustee makes no representations as to the validity
or sufficiency of this Indenture or of the Securities. The Trustee or any
Authenticating Agent shall not be accountable for the use or application by the
Company of Securities or the proceeds thereof, for the use of application of any
moneys paid over by the Trustee in accordance with any provisions of this
Indenture for the use or application of any money received by any Paying Agent
other than the Trustee.

      6.5.  May Hold Securities.

            The Trustee, any Authenticating Agent, any Paying Agent or any other
agent of the Company, in its individual or any other capacity, may become the
owner or pledge of Securities and, subject to Sections 6.8 and 6.13, may
otherwise deal with the Company with the same rights it would have if it were
not Trustee, Authenticating Agent, Paying Agent or such agent.

      6.6.  Money Held in Trust.

            Money held by the Trustee in trust hereunder need not be segregated
from other funds except to the extent required by law. The Trustee shall be
under no liability for interest on any money received by it hereunder except as
otherwise agreed with the Company.


                                      -34-
<PAGE>   41
      6.7.  Compensation and Reimbursement.

            The Company agrees:

            (a) to pay to the Trustee from time to time such compensation as
shall be agreed upon in writing for all services rendered by it hereunder (which
compensation shall not be limited by any provision of law in regard to the
compensation of a trustee of an express trust);

            (b) except as otherwise expressly provided herein, to reimburse the
Trustee upon its request for all expenses, disbursements and advances incurred
or made by the Trustee in accordance with any provision of this Indenture
(including the reasonable compensation and the expenses and disbursements of its
agents and counsel), except any such expense, disbursement or advance as may be
attributable to its negligence or willful misconduct;

            (c) to fully indemnify the Trustee and any predecessor Trustee for,
and to hold it harmless against any and all loss, liability, claim, damage or
expense (including taxes other than taxes based upon the income of the Trustee
and the reasonable fees and expenses of its agents and counsel) incurred without
negligence or willful misconduct on its part, arising out of or in connection
with the acceptance or administration of the trust or trusts hereunder,
including the costs and expenses of defending itself against any claim or
liability in connection with the exercise or performance of any of its powers or
duties hereunder; and

            (d) that the obligations of the Company under this Section 6.7 to
compensate the Trustee and to pay or reimburse the Trustee for such
expenditures, disbursements and advances shall constitute additional
indebtedness hereunder. Such additional indebtedness shall be secured by a lien
prior to that of the Securities upon all property and funds held or collected by
the Trustee as such except funds held in trust for the benefit of the Holders of
particular Securities.

      6.8.  Disqualification; Conflicting Interests.

            (a) If the Trustee has or shall acquire any conflicting interest, as
defined in the Trust Indenture Act, with respect to the Securities or any
series, it shall within 90 days after ascertaining that it has such conflicting
interest, either eliminate such conflicting interest or resign with respect to
the Securities of that series in the manner and with the effect hereinafter
specified in this Article.

            (b) In the event that the Trustee shall fail to comply with the
provisions of Subsection (a) of this Section with respect to the Securities of
any series, the Trustee shall, within 30 days after the expiration of such 90
day period, transmit by mail to all Holders of Securities of that series, as
their names and addresses appear in the Security Register, notice of such
failure.


                                      -35-
<PAGE>   42
      6.9.  Corporate Trustee Required; Eligibility.

            There shall at all times be a Trustee hereunder with respect to each
series of Securities which shall be a corporation organized and doing business
under the laws of the United States of America, any state thereof or the
District of Columbia, authorized under such laws to exercise corporate trust
powers, having (together with any Person directly or indirectly controlling the
Trustee) a combined capital and surplus of at least $50,000,000 subject to
supervision or examination by federal or state authority. If such corporation
publishes reports of condition at least annually, pursuant to law or to the
requirements of said supervising or examining authority, then for the purposes
of this section, the combined capital and surplus of such corporation shall be
deemed to be its combined capital and surplus as set forth in its most recent
report of condition so published. If at any time the Trustee shall cease to be
eligible in accordance with the provisions of this Section, it shall resign
immediately in the manner and with the effect hereinafter specified in this
article.

      6.10. Resignation and Removal; Appointment of Successor.

            (a) No resignation or removal of the Trustee and no appointment of a
successor Trustee pursuant to this article shall become effective until the
acceptance of appointment by the successor Trustee in accordance with the
applicable requirements of Section 6.11.

            (b) The Trustee may resign at any time with respect to the
Securities of one or more series by giving written notice thereof to the
Company. If the instrument of acceptance by a successor Trustee required by
Section 6.11 shall not have been delivered to the Trustee within 30 days after
the giving of such notice of resignation, the resigning Trustee may petition at
the expense of the Company any court of competent jurisdiction for the
appointment of a successor Trustee with respect to such series.

            (c) The Trustee may be removed at any time with respect to the
Securities of any series by Act of the Holders of a majority in principal amount
of the Outstanding Securities of such monies, delivered to the Trustee and to
the Company If the instrument of acceptance by a successor Trustee required by
Section 6.11 shall not have been delivered to the Trustee within 30 days after
the giving of such notice of resignation, the resigning Trustee may petition at
the expenses of the Company any court of competent jurisdiction for the
appointment of a successor Trustee with respect to such series.

            (d) If at any time:

                  (i) the Trustee shall fail to comply with Section 6.8.(a)
            after written request therefor by the Company or by any Holder who
            has been a bona fide Holder of a Security of the series as to which
            the Trustee has a conflicting interest for at least six months,


                                      -36-
<PAGE>   43
                  (ii) the Trustee shall cease to be eligible under Section 6.9
            and shall fail to resign after written request therefor by the
            Company or by any such Holder, or

                  (iii) the Trustee shall become incapable of acting or shall be
            adjudged a bankrupt or insolvent or a receiver of the Trustee or of
            its property shall be appointed or any public officer shall take
            charge or control of the Trustee or of its property or affairs for
            the purpose of rehabilitation, conservation or liquidation,

then, in any such case, (x) the Company by a Board Resolution may remove the
Trustee with respect to all Securities, or (y) subject to Section 5.14, any
Holder who has been a bona fide Holder of a Security for at least six months
may, on behalf of himself and all others similarly situated, petition any court
of competent jurisdiction for the removal of the Trustee with respect to all
Securities and the appointment of a successor Trustee or Trustees.

            (e) If the Trustee shall resign, be removed or become incapable of
acting, or if a vacancy shall occur in the office of Trustee for any cause, with
respect to the Securities of one or more series, the Company, by a Board
Resolution, shall promptly appoint a successor Trustee or Trustees with respect
to the Securities of that or those series (it being understood that any such
successor Trustee may be appointed with respect to the Securities of one or more
or all of such series and that at any time there shall be only one Trustee with
respect to the Securities of any particular series) and shall comply with the
applicable requirements of Section 6.11. If, within one year after such
resignation, removal or incapability, or the occurrence of such vacancy, a
successor Trustee with respect to the Securities of any series shall be
appointed by Act of the Holders of a majority in principal amount of the
Outstanding Securities of such series delivered to the Company and the retiring
Trustee, the successor Trustee so appointed shall, forthwith upon its acceptance
of such appointment in accordance with the applicable requirements of Section
6.11, become the successor Trustee with respect to the Securities of such series
and to that extent supersede the successor Trustee appointed by the Company. If
no successor Trustee with respect to the Securities of any series shall have
been so appointed by the Company or the Holders of Securities of such series and
accepted appointment in the manner required by Section 6.11, any Holder who has
been a bona fide Holder of a Security of such series for at least six months
may, on behalf of himself and all others similarly situated, petition any court
of competent jurisdiction for the appointment of a successor Trustee with
respect to the Securities of such series.

            (f) The Company shall give notice of each resignation and each
removal of Trustee with respect to the Securities of any series and each
appointment of a successor Trustee with respect to the Securities of any series
by mailing written notice of such event by first-class mail, postage prepaid, to
all Holders of Securities of such series as their names and addresses appear in
the Security Register. Each notice shall include the name of the successor
Trustee with respect to the Securities of such series and the address of its
Corporate Trust Office.


                                      -37-
<PAGE>   44
      6.11. Acceptance of Appointment by Successor.

            (a) In case of the appointment hereunder of a successor Trustee with
respect to all Securities, every such successor Trustee so appointed shall
execute, acknowledge and deliver to the Company and to the retiring Trustee an
instrument accepting such appointment, and thereupon the resignation or removal
of the retiring Trustee shall become effective and such successor Trustee,
without any further act, deed or conveyance, shall become vested with all the
rights, powers, trusts and duties of the retiring Trustee; but, on the request
of the Company or the successor Trustee, such retiring Trustee shall, upon
payment of its charges and the charges of its agents and counsel, execute and
deliver an instrument transferring to such successor Trustee all the rights,
powers and trusts of the retiring Trustee and shall duly assign, transfer and
deliver to such successor Trustee all property and money held by such retiring
Trustee hereunder.

            (b) In case of the appointment hereunder of a successor Trustee with
respect to the Securities of one or more (but not all) series, the Company, the
retiring Trustee and each successor Trustee with respect to the Securities of
one or more series shall execute and deliver an indenture supplemental hereto
wherein each successor Trustee shall accept such appointment and which

                  (i) shall contain such provision as shall be necessary or
            desirable to transfer and confirm to, and to vest in, each successor
            Trustee all the rights, powers, trusts and duties of the retiring
            Trustee with respect to the Securities of that or those series to
            which the appointment of such successor Trustee relates,

                  (ii) if the retiring Trustee is not retiring with respect to
            all Securities, shall contain such provisions as shall be deemed
            necessary or desirable to confirm that all the rights, powers,
            trusts and duties of the retiring Trustee with respect to the
            Securities of that or those series as to which the retiring Trustee
            is not retiring shall continue to be vested in the retiring Trustee,
            and

                  (iii) shall add to or change any of the provisions of this
            Indenture as shall be necessary to provide for or facilitate the
            administration of the trusts hereunder by more than one Trustee, it
            being understood that nothing herein or in such supplemental
            indenture shall constitute such Trustees co-trustees of the same
            trust, that each such Trustee shall be trustee of a trust or trusts
            hereunder separate and apart from any trust or trusts hereunder
            administered by any other such Trustee and that no Trustee shall be
            responsible for any act or failure to act on the part of any other
            trustee hereunder; and upon the execution and delivery of such
            supplemental indenture the resignation or removal of the retiring
            Trustee shall become effective to the extent provided therein, such
            retiring Trustee shall with respect to the Securities of that or
            those series to which the appointment of such successor Trustee
            relates have no further responsibility for the exercise of rights
            and powers or for the performance of the duties and obligations
            vested in the Trustee under this Indenture, and each such successor
            Trustee, without any further act, deed or conveyance, shall become
            vested with all the rights, powers, trusts 


                                      -38-
<PAGE>   45
            and duties of the retiring Trustee with respect to the Securities of
            that or those series to which the appointment of such successor
            Trustee relates; but, on request of the company or any successor
            Trustee, such retiring Trustee shall duly assign, transfer and
            deliver to such successor Trustee, to the extent contemplated by
            such supplemental indenture, the property and money held by such
            retiring Trustee hereunder with respect to the Securities of that or
            those series to which the appointment of such successor Trustee
            relates.

            (c) Upon request of any such successor Trustee, the Company shall
execute any and all instruments for more fully and certainly vesting in and
confirming to such successor Trustee all such rights, powers and trusts referred
to in Paragraph (a) or (b) of this Section, as the case may be.

            (d) No successor Trustee shall accept its appointment unless at the
time of such acceptance such successor Trustee shall be qualified and eligible
under this article.

      6.12. Merger, Conversion, Consolidation or Succession to Business.

            Any corporation into which the Trustee may be merged or converted or
with which it may be consolidated, or any corporation resulting from any merger,
conversion or consolidation to which the Trustee shall be a party, or any
corporation succeeding to all or substantially all the corporate trust business
of the Trustee, shall be the successor of the Trustee hereunder, provided such
corporation shall be otherwise qualified and eligible under this article,
without the execution or filing of any paper or any further act on the part of
any of the parties hereto. In case any Securities shall have been authenticated,
but not delivered by the Trustee then in office, any successor by merger,
conversion, or consolidation to such authenticating Trustee may adopt such
authentication and deliver the Securities so authenticated with the same effect
as if such successor Trustee had itself authenticated such Securities.

      6.13. Preferential Collection of Claims Against Company.

            (a) Subject to Subsection (b) of this section, if the Trustee shall
be or shall become a creditor, directly or indirectly, secured or unsecured, of
the Company within four months prior to a default, as defined in Subsection (c)
of this section, or subsequent to such a default, then, unless and until such
default shall be cured, the Trustee shall set apart and hold in a special
account for the benefit of the Trustee, individually, the Holders of the
Securities and the holders of other indenture securities, as defined in
Subsection 9(c) of this section:

                  (i) an amount equal to any and all reductions in the amount
            due and owing upon any claim as such creditor in respect of
            principal, premium, if any, or interest, effected after the
            beginning of such four month period and valid as against the Company
            and its other creditors, except any such reduction resulting from
            the receipt or disposition of any property described in Paragraph
            (ii) of this subsection, or from the exercise of any right of
            set-off which the Trustee could have exercised if a petition in
            bankruptcy had been filed by or against the Company upon the date of
            such default; and


                                      -39-
<PAGE>   46
                  (ii) all property received by the Trustee in respect of any
            claims as such creditor, either as security therefor, or in
            satisfaction or composition thereof, or otherwise, after the
            beginning of such four month period, or an amount equal to the
            proceeds of any such property, if any, of the Company and its other
            creditors in such property or such proceeds.

            Nothing herein contained, however, shall affect the right of the
Trustee:

                        (A) to retain for its own account

                              (1) payments made on account of any such claim by
                        any Person (other than the Company) who is liable
                        thereon, and

                              (2) the proceeds of the bona fide sale of any such
                        claim by the Trustee to a third Person, and

                              (3) distributions made in cash, securities or
                        other property in respect of claims filed against the
                        Company in bankruptcy or receivership or in proceedings
                        for reorganization pursuant to the Federal Bankruptcy
                        Act or applicable state law;

                        (B) to realize, for its own account upon any property
                  held by it as security for any such claim, if such property
                  was so held prior to the beginning of such four month period;

                        (C) to realize, for its own account, but only to the
                  extent of the claim hereinafter mentioned, upon any property
                  held by it as security for any such claim, if such claim was
                  created after the beginning of such four month period and such
                  property was received as security therefor simultaneously with
                  the creation thereof, and if the Trustee shall sustain the
                  burden of proving that at the time such property was so
                  received the Trustee had no reasonable cause to believe that a
                  default, as defined in Subsection (c) of this section would
                  occur within four months; or

                        (D) to receive payment on any claim referred to in
                  Paragraph (B) or (C), against the release of any property held
                  as security for such claim as provided in Paragraph (B) or
                  (C), as the case may be, to the extent of the fair value of
                  such property.

                        For purposes of Paragraph (B), (C) and (D), property
                  substituted after the beginning of such four month period for
                  property held as security at the time of such substitution
                  shall, to the extent of the fair value of the property
                  released, have the same status as the property released, have
                  the same status as the property released, and, to the extent
                  that any claim referred to in any of such paragraphs is
                  created in renewal of or in substitution for or for the
                  purpose of repaying or refunding any pre-


                                      -40-
<PAGE>   47
                  existing claim of the Trustee as such creditor, such claim
                  shall have the same status as such pre-existing claim.

            If the Trustee shall be required to account, the funds and property
held in such special account and the proceeds thereof shall be apportioned among
the Trustee, the Holders and the holders of other indenture securities in such
manner that the Trustee, the Holders and the holders of other indenture
securities realize, as a result of payment from such special account and
payments of dividends on claims filed against the Company in bankruptcy or
receivership or in proceedings for reorganization pursuant to the Federal
Bankruptcy Act or applicable state law, the same percentage of their respective
claims, calculated before crediting to the claim of the Trustee anything on
account of the receipt by it from the Company of the funds and property in such
special account and before crediting to the respective claims of the Trustee and
the Holders and the holders of other indenture securities dividends on claims
filed against the Company in bankruptcy or receivership or in proceedings for
reorganization pursuant to the Federal Bankruptcy Act or applicable state law,
but after crediting thereon receipts on account of the indebtedness represented
by their respective claims from all sources other than from such dividends and
from the funds and property so held in such special account. As used in this
paragraph, with respect to any claim, the term "dividend" shall include any
distribution with respect to such claim, in bankruptcy or receivership or
proceedings for reorganization pursuant to the Federal Bankruptcy Act or
applicable state law, whether such distribution is made in cash, securities or
other property, but shall not include any such distribution with respect to the
secured portion, if any, of such claim. The court in which such bankruptcy,
receivership or proceedings for reorganization is pending shall have
jurisdiction (x) to apportion among the Trustee, the Holders and the holders of
other indenture securities, in accordance with the provisions of this paragraph
due consideration in determining the fairness of the distributions to be made to
the Trustee and the Holders and the holders of other indenture securities with
respect to their respective claims, in which event it shall not be necessary to
liquidate or to appraise the value of any securities or other property held in
such special account or as security for any such claim, or to make a specific
allocation of such distributions as between the secured or unsecured portions of
such claims, or otherwise to apply the provisions of this paragraph as a
mathematical formula.

            Any Trustee which has resigned or been removed after the beginning
of such four month period shall be subject to the provisions of this subsection
as though such resignation or removal had not occurred. If any Trustee has
resigned or been removed prior to the beginning of such four month period, it
shall be subject to the provisions of this subsection if and only if the
following conditions exist:

                  (iii) with receipt of property or reduction of claim, which
            would have given rise to the obligation to account, if such Trustee
            had continued as Trustee, occurred after the beginning of such four
            month period; and

                  (iv) such receipt of property or reduction of claim occurred
            within four months after such resignation or removal.


                                      -41-
<PAGE>   48
            (b) There shall be excluded from the operation of Subsection (a) of
this section a creditor relationship arising from:

                  (i) the ownership or acquisition of securities issued under
            any indenture, or any security or securities having a maturity of
            one year or more at the time of acquisition by the Trustee;

                  (ii) advances authorized by a receivership or bankruptcy court
            of competent jurisdiction or by this Indenture, for the purpose of
            preserving any property which shall at any time be subject to the
            lien of this Indenture or of discharging tax liens or other prior
            liens or encumbrances thereon, if notice of such advances and of the
            circumstances surrounding the making thereof is given to the Holders
            at the time and in the manner provided in this Indenture;

                  (iii) disbursements made in the ordinary course of business in
            the capacity of trustee under an indenture, transfer agent,
            registrar, custodian, paying agent, rights agent, fiscal agent or
            depository, or other similar capacity;

                  (iv) an indebtedness created as a result of services rendered
            or premises rented; or an indebtedness created as a result of goods
            or securities sold in a cash transaction, as defined in Subsection
            (c) of this section;

                  (v) the ownership of stock or of other securities of a
            corporation organized under the provisions of Section 25(a) of the
            Federal Reserve Act, as amended, which is directly or indirectly a
            creditor of the Company; and

                  (vi) the acquisition, ownership, acceptance or negotiation of
            any drafts, bills of exchange, acceptances or obligations which fall
            within the classification of self-liquidating paper, as defined in
            Subsection (c) in this section.

            (c) For the purposes of this section only:

                  (i) the term "default" means any failure to make payment in
            full of the principal of or interest on any of the Securities or
            upon the other indenture securities when and as such principal or
            interest becomes due and payable;

                  (ii) the term "other indenture securities" means securities
            upon which the Company is an obligor outstanding under any other
            indenture

                        (A) under which indenture and as to which securities the
                  Trustee is also trustee,

                        (B) which contains provisions substantially similar to
                  the provisions of this section, and

                        (C) under which a default exists at the time of the
                  apportionment of the funds and property held in such account;


                                      -42-
<PAGE>   49
                  (iii) the term "cash transaction" means any transaction in
            which full payment for goods or securities sold is made within seven
            days after delivery of the goods or securities in currency or in
            checks or other orders drawn upon banks or bankers and payable upon
            demand;

                  (iv) the term "self-liquidating paper" means any draft, bill
            of exchange, acceptance or obligation which is made, drawn,
            negotiated or incurred by the Company for the purpose of financing
            the purchase, processing, manufacturing, shipment, storage or sale
            of goods, wares or merchandise and which is secured by documents
            evidencing title to, possession of, or a lien upon, the goods, wares
            or merchandise or the receivables or proceeds arising from the sale
            of the goods, wares or merchandise previously constituting the
            security, provided the security is received by the Trustee
            simultaneously with the creation of the creditor relationship with
            the Company arising from the making, drawing, negotiating or
            incurring of the draft, bill of exchange, acceptance or obligation;

                  (v) the term "Company" means any obligor upon the Securities;
            and

                  (vi) the term "Federal Bankruptcy Act" means the Bankruptcy
            Act or Title 11 of the United States Code.

      6.14. Appointment of Authenticating Agent.

            (a) At any time when any of the Securities remain outstanding the
Trustee may appoint an Authenticating Agent or Agents with respect to one or
more series of Securities which shall be authorized to act on behalf of the
Trustee to authenticate Securities of such series issued upon exchange,
registration of transfer or partial redemption thereof or pursuant to Section
3.6, and Securities so authenticated shall be entitled to the benefits of this
Indenture and shall be valid and obligatory for all purposes as if authenticated
by the Trustee hereunder. Whenever reference is made in this Indenture to the
authentication and delivery of Securities by the Trustee or the Trustee's
certificate of authentication, such reference shall be deemed to include
authentication and delivery by an Authenticating Agent and a certificate of
authentication executed by an Authenticating Agent. Each Authenticating Agent
shall be acceptable to the Company and shall at all times be a corporation
organized and doing business under the laws of the United States of America, any
state thereof or the District of Columbia, authorized under such laws to act as
Authenticating Agent, having a combined capital and surplus of not less than
$50,000,000 and subject to supervision or examination by federal or state
authority. If such Authenticating Agent publishes reports of condition at least
annually, pursuant to law or to the requirements of said supervising or
examining authority, then for the purposes of this section, the combined capital
and surplus of such Authenticating Agent shall be deemed to be its combined
capital and surplus as set forth in its most recent report of condition so
published. If at any time an Authenticating Agent shall cease to be eligible in
accordance with the provisions of this section, such Authenticating Agent shall
resign immediately in the manner and with the effect specified in this section.


                                      -43-
<PAGE>   50
            (b) Any corporation into which an Authenticating Agent may be merged
or converted or with which it may be consolidated, or any corporation resulting
from any merger, conversion or consolidation to which such Authenticating Agent
shall be a party, or any corporation succeeding to the corporate agency or
corporate trust business of an Authenticating Agent, shall continue to be an
Authenticating Agent, provided such corporation shall be otherwise eligible
under this section, without the execution or filing of any paper or any further
act on the part of the Trustee or the Authenticating Agent.

            (c) An Authenticating Agent may resign at any time by giving written
notice thereof to the Trustee and to the Company. The Trustee may at any time
terminate the agency of an Authenticating Agent by giving written notice thereof
to such Authenticating Agent and to the Company. Upon receiving such a notice of
resignation or upon such a termination, or in case at any time such
Authenticating Agent shall cease to be eligible in accordance with the provision
of this Section, the Trustee may appoint a successor Authenticating Agent which
shall be acceptable to the Company and shall mail written notice of such
appointment by first-class mail, postage prepaid, to all Holders of Securities
of the series with respect to which such Authenticating Agent will serve, as
their names and addresses appear in the Security Register. Any successor
Authenticating Agent upon acceptance of its appointment hereunder shall become
vested with all rights, powers and duties of its predecessor hereunder, with
like effect as if originally named as an Authenticating Agent. No successor
Authenticating Agent shall be appointed unless eligible under the provisions of
this section.

            (d) The Trustee agrees to pay to each Authenticating Agent from time
to time reasonable compensation for its services under this section, and the
Trustee shall be entitled to be reimbursed for such payments.

            (e) The provisions of Section 3.8, 6.4 and 6.5 shall be applicable
to each Authenticating Agent.

            (f) Pursuant to each appointment made under this section, the
Securities of each series covered by such appointment may have endorsed thereon,
in addition to the Trustee's certificate of authentication, an alternative
certificate of authentication in the following form:


                                      -44-
<PAGE>   51
            This is one of the Securities of the series designated herein
referred to in the within-mentioned Indenture.

                                    THE BANK OF NEW YORK

                                    ------------------------------------
                                          As Authenticating Agent


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

                                    Dated:
                                          ------------------------------


      6.15. Trustee's Application for Instructions from the Company.

            Any application by the Trustee for written instructions from the
Company may, at the option of the Trustee, set forth in writing any action
proposed to be taken or omitted by the Trustee under this Indenture and the date
on and/or after which such action shall be taken or such omission shall be
effective. The Trustee shall not be liable for any action taken by, or omission
of, the Trustee in accordance with a proposal included in such application on or
after the date specified in such application (which date shall not be less than
three Business Days after the date any officer of the Company actually receives
such application, unless any such officer shall have consented in writing to any
earlier date) unless prior to taking any such action (or the effective date in
the case of an omission), the Trustee shall have received written instructions
in response to such application specifying the action to be taken or omitted.

7.    HOLDERS LISTS AND REPORTS BY TRUSTEE AND COMPANY

      7.1.  Company to Furnish Trustee Names and Addresses of Holders.

            (a) The Company will furnish or cause to be furnished to the
Trustee:

                  (i) semi-annually, not more than 15 days after each record
            date with respect to a regular interest payment date for each series
            of Securities, a list, in such form as the Trustee may reasonably
            require, of the names and addresses of the Holders of such series as
            of such record date; provided, however, that if Securities of any
            series shall have more than two regular interest payment dates in
            each calendar year or shall not bear interest, then such list with
            respect to such series of Securities will be furnished to the
            Trustee semi-annually on such dates as may be agreeable to the
            Trustee; and

                  (ii) at such other times as the Trustee may request in
            writing, within 30 days after the receipt by the Company of any such
            request, a list of similar form 


                                      -45-
<PAGE>   52
            and content as of a date not more than 15 days prior to the time
            such list is furnished.

            (b) Any such list may be dated as of the date not more than 15 days
prior to the time such information is furnished or caused to be furnished and
need not include information received after such date; provided, however, that
if the Trustee is the sole Security Registrar with respect to any series of
Securities, no such list need be furnished with respect to such series.

      7.2.  Preservation of Information; Communications to Holders.

            (a) The Trustee shall preserve, in as current a form as is
reasonably practicable, the names and addresses of holders contained in the most
recent list furnished to the Trustee as provided in Section 7.1 and the names
and addresses of holders received by the Trustee in its capacity as sole
Security Registrar, if so acting. The Trustee may destroy any list furnished to
it as provided in Section 7.1 upon receipt of a new list so furnished.

            (b) If three or more Holders (herein referred to as "applicants")
apply in writing to the Trustee, and furnish proof reasonably satisfactory to
the Trustee that each such applicant has owned a Security for a period of at
least six months preceding the date of such application, and such application
states that the applicants' desire to communicate with other Holders with
respect to their rights under this Indenture or under the Securities and is
accompanied by a copy of the form of proxy or other communication which such
applicants propose to transmit, then the Trustee shall, within five business
days after the receipt of such application, at its election, either:

                  (i) afford such applicants access to the information preserved
            at the time by the Trustee in accordance with Section 7.2(a), or

                  (ii) inform such applicants as to the approximate number of
            Holders whose names and addresses appear in the information
            preserved at the time by the Trustee in accordance with Section
            7.2(a), and as to the approximate cost of mailing to such Holders
            the form of proxy or other communication, if any, specified in such
            application.

            If the Trustee shall elect not to afford such applicants access to
such information, the Trustee shall upon the written request of such applicants,
mail to each Holder whose name and address appears in the information preserved
at the time by the Trustee in accordance with Section 7.2(a) a copy of the form
of proxy or other communication which is specified in such request, with
reasonable promptness after a tender to the Trustee of the material to be mailed
and of payment, or provision for the payment, of the reasonable expenses of
mailing, unless within five days after such tender the Trustee shall mail to
such applicants and file with the Commission, together with a copy of the
material to be mailed, a written statement to the effect that, in the opinion of
the Trustee, such mailing would be contrary to the best interests of the Holders
or would be in violation of applicable law. Such written statement shall specify
the basis of such opinion. If the Commission, after opportunity for hearing upon
the objections 


                                      -46-
<PAGE>   53
specified in the written statement so filed, shall enter an order refusing to
sustain any of such objections or if, after the entry of an order sustaining one
or more of such objections, the Commission shall find, after notice and
opportunity for hearing, that all the objections so sustained have been met and
shall enter an order so declaring, the Trustee shall mail copies of such
material to all such Holders with reasonable promptness after the entry of such
order and renewal of such tender; otherwise the Trustee shall be relieved of any
obligation or duty to such applicants respecting their application.

            (c) Every Holder of Securities, by receiving and holding the same,
agrees with the company and the Trustee that neither the Company nor the Trustee
nor any agent of either of them shall be held accountable by reason of the
disclosure of any such information as to the names and addresses of the Holders
in accordance with Section 7.2.(b), regardless of the source from which such
information was derived, and that the Trustee shall not be held accountable by
reason of mailing any material pursuant to a request made under Section 7.2.(b).

      7.3.  Reports by Trustee.

            (a) Within 60 days after May 15 of each year commencing with the May
15 next succeeding the Original Issue Date of such Securities, the Trustee shall
transmit by mail to all Holders, as their names and addresses appear in the
Security Register, a brief report dated as of such May 15 with respect to:

                  (i) its eligibility under Section 6.9 and its qualifications
            under Section 6.8, or in lieu thereof, if to the best of its
            knowledge it has continued to be eligible and qualified under said
            section, a written statement to such effect;

                  (ii) the character and amount of any advances (and if the
            Trustee elects so to state, the circumstances surrounding the making
            thereof) made by the Trustee (as such) which remain unpaid on the
            date of such report, and for the reimbursement of which it claims or
            may claim a lien or charge, prior to that of the Securities, on the
            trust estate or on any property or funds held or collected by it as
            Trustee, except that the Trustee shall not be required (but may
            elect) to report such advances if such advances so remaining unpaid
            aggregate not more than 1/2 of 1% of the principal amount of the
            Securities Outstanding on the date of such report;

                  (iii) the amount, interest rate and maturity date of all other
            indebtedness owing by the Company (or by any other obligor on the
            Securities) to the Trustee in its individual capacity, on the date
            of such report, with a brief description of any property held as
            collateral security therefor, except an indebtedness based upon a
            creditor relationship arising in any manner described in Section
            6.13(b)(ii), (iii), (iv) or (vi);

                  (iv) the property and funds, if any, physically in the
            possession of the Trustee (as such) on the date of such report;


                                      -47-
<PAGE>   54
                  (v) any additional issue of Securities which the Trustee has
            not previously reported; and

                  (vi) any action taken by the Trustee in the performance of its
            duties hereunder which it has not previously reported and which in
            its opinion materially affects the Securities, or the Securities of
            any series, except action in respect of a default, notice of which
            has been or is to be withheld by the Trustee in accordance with
            Section 6.2.

            (b) The Trustee shall transmit by mail to all Holders, as their
names and addresses appear in the Security Register, a brief report with respect
to the character and amount of any advances (and if the Trustee elects so to
state, the circumstances surrounding the making thereof) made by the Trustee (as
such) since the date of the last report transmitted pursuant to Subsection (a)
of this section (or if no such report has yet been so transmitted, since the
date of execution of this instrument) for the reimbursement of which it claims
or may claim a lien or charge, prior to that of the Securities, on the trust
estate or on property or funds held or collected by it as Trustee and which it
has not previously reported pursuant to this subsection, except that the Trustee
shall not be required (but may elect) to report such advances if such advances
remaining unpaid at any time aggregate 10% or less of the principal amount of
the Securities Outstanding at such time, such report to be transmitted within 90
days after such time.

            (c) A copy of each such report shall, at the time of such
transmission to Holders, be filed by the Trustee with each stock exchange upon
which any securities are listed, with the commission and with the Company. The
Company will promptly notify the Trustee when any Securities are listed on any
stock exchange or delisted therefrom. 

      7.4.  Reports by Company.

            The Company shall:

            (a) file with the Trustee, within 15 days after the Company is
required to file the same with the Commission, copies of the annual reports and
of the information, documents and other reports (or copies of such portions of
any of the foregoing as the Commission may from time to time by rules and
regulations prescribe) which the company may be required to file with the
Commission pursuant to Section 13 or Section 15(d) of the Securities Exchange
Act of 1934, as amended (the "Exchange Act"); or, if the company is not required
to file information, documents or reports pursuant to either of said sections,
then it shall file with the Trustee and the Commission, in accordance with rules
and regulations prescribed from time to time by the Commission, such of the
supplementary and periodic information, documents and reports which may be
required pursuant to Section 13 of the Exchange Act in respect of a security
listed and registered on a national securities exchange as may be prescribed
from time to time in such rules and regulations; delivery of such reports,
information and documents to the Trustee is for informational purposes only and
the Trustee's receipt of such shall not constitute constructive notice of any
information contained therein or determinable from information contained
therein, 


                                      -48-
<PAGE>   55
including the Company's compliance with any of its covenants hereunder (as to
which the Trustee is entitled to rely exclusively on Officers' Certificates);

            (b) file with the Trustee and the Commission, in accordance with
rules and regulations prescribed from time to time by the Commission, such
additional information, documents and reports with respect to compliance by the
Company with the conditions and covenants of this Indenture as may be required
from time to time by such rules and regulations delivery of such reports,
information and documents to the Trustee is for informational purposes only and
the Trustee's receipt of such shall not constitute constructive notice of any
information contained therein or determinable from information contained
therein, including the Company's compliance with any of its covenants hereunder
(as to which the Trustee is entitled to rely exclusively on Officers'
Certificates);

            (c) transmit by mail to all Holders, as their names and addresses
appear in the Security Register, within 30 days after the filing thereof with
the Trustee, such summaries of any information, documents and reports required
to be filed by the Company pursuant to Paragraphs (a) and (b) of this section as
may be required by rules and regulations prescribed from time to time by the
Commission; and

            (d) promptly furnish such additional information regarding the
Company as may be reasonably requested and reasonably deemed necessary by the
Trustee in the conduct of its duties hereunder; provided, however, that the
Company shall have no such obligation concerning any information constituting
restricted securities information under any law or governmental regulation at
the time of application thereto.

8.    CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE

      8.1.  Company May Consolidate, Etc., Only on Certain Terms.

      The Company shall not consolidate with or merge with or into any other
corporation or convey, transfer or lease its properties and assets substantially
as an entirety to any Person, unless:

            (a) the corporation formed by such consolidation or with or into
which the Company is merged or the Person which acquires by conveyance or
transfer, or which leases the properties and assets of the Company substantially
as an entirety shall be a corporation organized and existing under the laws of
the United State of America, any state thereof or the District of Columbia and
shall expressly assume, by an indenture supplemental hereto, executed and
delivered to the Trustee, in form satisfactory to the Trustee, the due and
punctual payment of the principal of (and premium, if any) and interest on all
the Securities and the performance and observance of every covenant of this
Indenture on the part of the Company to be performed or observed;

            (b) immediately after giving effect to such transaction no Event of
Default, and no event which, after notice or lapse of time or both, would become
an Event of Default, shall have happened or be continuing; and


                                      -49-
<PAGE>   56
            (c) the Company has delivered to the Trustee an Officers'
Certificate and an Opinion of Counsel each stating that such consolidation,
merger, conveyance, transfer or lease and supplemental indenture comply with
this article and that all conditions precedent herein provided for relating to
such transaction have been complied with.

      8.2.  Successor Corporation Substituted.

            Upon any consolidation by the Company with or merger by the Company
with or into any other corporation or any conveyance, transfer or lease of the
properties and assets of the Company substantially as an entirety in accordance
with Section 8.1, the successor corporation formed by such consolidation or with
or into which the Company is merged or to which such conveyance, transfer or
lease is made shall succeed to, and be substituted for, and may exercise every
right and power of, the Company under this Indenture with the same effect as if
such successor corporation had been named as the Company herein, and thereafter,
except in the case of a lease, the predecessor corporation shall be relieved of
all obligations and covenants under this Indenture and the Securities.

      8.3.  Officers' Certificates and Opinions of Counsel.

            The Trustee, subject to the provisions of Article Six, may receive
an Officers' Certificate and an Opinion of Counsel as conclusive evidence that
any consolidation, merger, conveyance, transfer or lease and any assumption
complies with the provisions of this Article Eight, that all conditions
precedent herein provided for relating to such transaction have been complied
with and that it is proper for the Trustee under the provisions of this Article
Eight to join in the execution of the supplemental Indenture referred to in
Section 8.1.

9.    SUPPLEMENTAL INDENTURES

      9.1.  Supplemental Indentures without Consent of Holders.

      Without the consent of any Holders, the Company, when authorized by a
Board Resolution, and the Trustee, at any time and from time to time, may enter
into one or more indentures supplemental hereto, in form satisfactory to the
Trustee, for any of the following purposes:

            (a) to evidence the succession of another corporation to the Company
and the assumption by any such successor of the covenants of the Company herein
and in the securities; or

            (b) to add to the covenants of the Company for the benefit of the
Holders of all or any series of Securities (and if such covenants are to be for
the benefit of less than all series of Securities, stating that such covenants
are expressly being included solely for the benefit of such series) or to
surrender any right or power herein conferred upon the Company; or

            (c) to add any additional Events of Default; or


                                      -50-
<PAGE>   57
            (d) to add to or change any of the provisions of this Indenture to
such extent as shall be necessary to permit or facilitate the issuance of
Securities in bearer form, registrable as to principal, and with or without
interest coupons; or

            (e) to change or eliminate any of the provisions of this Indenture,
provided that, any such change or elimination shall become effective only when
there is no Security Outstanding of any series created prior to the execution of
such supplemental indenture which is entitled to the benefit of such provision;
or

            (f) to secure the Securities; or

            (g) to establish the form or terms of Securities of any series as
permitted by Sections 2.1 and 3.2; or

            (h) to evidence and provide for the acceptance of appointment
hereunder by a successor Trustee with respect to the Securities of one or more
series and to add to or change any of the provisions of this Indenture as shall
be necessary to provide for or facilitate the administration of the trusts
hereunder by more than one Trustee, pursuant to the requirements of Section
6.11.(b); or

            (i) to cure any ambiguity, to correct or supplement any provision
herein which may be inconsistent with any other provision herein, or to make any
other provisions with respect to matters or questions arising under this
Indenture, provided such action shall not adversely affect the interest of the
Holders of Securities of any series in any material respect.

      9.2.  Supplemental Indentures with Consent of Holders.

            (a) With the consent of the Holders of not less than 80% in
principal amount of the Outstanding Securities of each series affected by such
supplemental indenture, by Act of said Holders delivered to the Company and the
Trustee, the Company, when authorized by a Board Resolution, and the Trustee may
enter into an indenture or indentures supplemental hereto for the purpose of
adding any provisions to or changing in any manner or eliminating any of the
provisions of this Indenture or of modifying in any manner the rights of the
Holders of Securities of such series under this Indenture; provided, however,
that no such supplemental indenture shall, without the consent of the Holder of
each outstanding Security affected thereby,

                  (i) change the due date of the principal of, or any
            installment of principal of or interest on, any Security, or reduce
            the principal amount thereof or the rate of interest thereon or any
            premium payable upon the redemption thereof, or reduce the amount of
            the principal of any Security that would be due and payable upon a
            declaration of the maturity thereof pursuant to Section 5.2, or
            change the coin or currency in which any Security or any premium or
            the interest thereon in payable, or impair the right to institute
            suit for the enforcement of any such payment on or after the due
            date thereof (or, in the case of redemption, on or after the
            Redemption Date), or


                                      -51-
<PAGE>   58
                  (ii) reduce the percentage in principal amount of the
            outstanding Securities of any series, the consent of whose Holders
            is required for any waiver (of compliance with certain provisions of
            this Indenture or certain defaults hereunder and their consequences)
            provided for in this Indenture, or

                  (iii) modify any of the provisions of this section or Section
            5.13, except to increase any such percentage or to provide that
            certain other provisions of this Indenture cannot be modified or
            waived without the consent of the Holder of each Outstanding
            Security affected thereby; provided however, that this clause shall
            not be deemed to require the consent of any Holder with respect to
            changes in the references to "the Trustee" and concomitant changes
            in this section or the deletion of this provision, in accordance
            with the requirements of Sections 6.11.(b) and 9.1.(h).

            (b) A supplemental indenture which changes or eliminates any
covenant or other provision of this Indenture which has expressly been included
solely for the benefit of one or more particular series of Securities, or which
modifies the rights of the Holders of Securities of such series with respect to
such covenant or other provision, shall be deemed not to affect the rights under
this Indenture of the Holders of Securities of any other series.

            (c) It shall not be necessary for any Act of Holders under this
section to approve the particular form of any proposed supplemental indenture,
but it shall be sufficient if such Act shall approve the substance thereof.

      9.3.  Execution of Supplemental Indentures.

            In executing or accepting the additional trusts created by any
supplemental indenture permitted by this article or the modifications thereby of
the trusts created by this Indenture, the Trustee shall be entitled to receive,
and (subject to Section 6.1) shall be fully protected in relying upon, an
Opinion of Counsel and an Officers' Certificate stating that the execution of
such supplemental indenture is authorized or permitted by this Indenture, that
it is not inconsistent therewith, and that it will be valid and binding upon the
Company in accordance with its terms. The Trustee is hereby authorized to join
with the Company in the execution of any supplemental indenture permitted by
this Article and is authorized or permitted by the terms of this Indenture to
make any further appropriate agreements and stipulations which may be therein
contained, but the Trustee shall not be obligated to enter into any such
supplemental indenture which affects its own rights, duties or immunities under
this Indenture or otherwise.

      9.4.  Effect of Supplemental Indentures.

            Upon the execution of any supplemental indenture under this article,
this Indenture shall be modified in accordance therewith, and such supplemental
indenture shall form a part of this Indenture for all purposes; and every Holder
of Securities theretofore or thereafter authenticated and delivered hereunder
shall be bound thereby.


                                      -52-
<PAGE>   59
      9.5.  Conformity with Trust Indenture Act.

            Every supplemental indenture executed pursuant to this article shall
conform to the requirements of the Trust Indenture Act as then in effect.

      9.6.  Reference in Securities to Supplemental Indentures.

            Securities of any series authenticated and delivered after the
execution of any supplemental indenture pursuant to this article may, and shall
if required by the Trustee, bear a notation in form approved by the Trustee as
to any matter provided for in such supplemental Indenture. If the Company shall
so determine, new Securities of any series so modified as to conform, in the
opinion of the Trustee and the Company, to any such supplemental indenture may
be prepared and executed by the Company and delivered by the Company to the
Trustee and thereafter upon surrender by the Holders of Outstanding Securities,
the same shall be authenticated and delivered by the Trustee in exchange for
Outstanding Securities of such series, but any such exchange shall not be
necessary to make such modification effective as to Outstanding Securities.

10.   COVENANTS

      10.1. Payment of Premium and Interest.

            The Company covenants and agrees for the benefit of each series of
Securities that it will duly and punctually pay the principal of (and premium,
if any) and interest on the Securities of that series in accordance with the
terms of the Securities and this Indenture.

      10.2. Maintenance of Office or Agency.

            The Company will maintain in the Borough of Manhattan, The City of
New York for any series of Securities an office or agency where Securities of
that series may be presented or surrendered for payment, where Securities of
that series may be surrendered for registration of transfer or exchange and
where notices and demands to or upon the Company in respect of the Securities of
that series and this Indenture may be served. Unless otherwise designated by the
Company in a written notice to the Trustee, such office or agency for all
purposes shall be the Corporate Trust Office of the Trustee. The Company will
give prompt written notice to the Trustee of the location, and any change in the
location, of such office or agency. If at any time the Company shall fail to
maintain any such required office or agency or shall fail to furnish the Trustee
with the address thereof, such presentations, surrenders, notices and demands
may be made or served at the Corporate Trust Office of the Trustee.

      10.3. Money for Securities Payments to Be Held in Trust.

            (a) The Company will, prior to each due date of the principal of
(and premium, if any) or interest on any Securities of that series, deposit with
a Paying Agent a sum sufficient to pay the principal (and premium, if any) or
interest so becoming due, such sum to be held in trust for the benefit of the
Persons entitled to such principal, premium or interest, and 


                                      -53-
<PAGE>   60
(unless such Paying Agent is the Trustee) the Paying Agent will promptly notify
the Trustee of the Company's action or failure so to act.

            (b) The Company will cause each Paying Agent for any series of
Securities other than the Trustee to execute and deliver to the Trustee an
instrument in which such Paying Agent shall agree with the Trustee, subject to
the provisions of this section, that such Paying Agent will:

                  (i) hold all sums held by it for the payment of the principal
            of (and premium, if any) or interest on Securities of that series in
            trust for the benefit of the Persons entitled thereto and such sums
            shall be paid to such Persons or otherwise disposed of as herein
            provided;

                  (ii) give the Trustee notice within two Business Days of any
            default by the Company (or any other obligor upon the Securities of
            that series) in the making of any payment of principal of (and
            premium, if any) or interest on the Securities of that series; and

                  (iii) at any time during the continuance of any such default,
            upon the written request of the Trustee, forthwith pay to the
            Trustee all sums so held in trust by such Paying Agent.

            (c) The Company may at any time, for the purpose of obtaining the
satisfaction and discharge of this Indenture or for any other purpose, or by
Company Order direct any Paying Agent to pay, to the Trustee all sums held by
such Paying Agent, such sums to be held by the Trustee upon the same trusts as
those upon which such sums were held by the Paying Agent; and, upon such payment
by any Paying Agent to the Trustee, such Paying Agent shall be released from all
further liability with respect to such money.

            (d) Any money deposited with the Trustee or any Paying Agent in
trust for the payment of the principal of (and premium, if any) or interest on
any Security of any series and remaining unclaimed for three years after such
principal (and premium, if any) or interest has become due and payable shall be
paid to the Company on Company Request, and the Holder of such Security shall
thereafter, as an unsecured general creditor, look only to the Company for
payment thereof, and all liability of the Trustee or such Paying Agent with
respect to such trust money, and all liability of the Company as trustee
thereof, shall thereupon cease, provided, however, that the Trustee or such
Paying Agent, before being required to make any such repayment, may at the
expense of the Company cause to be published once in a newspaper published in
the English language, customarily published on each Business Day and of general
circulation in Chicago, Illinois and the Borough of Manhattan, The City of New
York, notice that such money remains unclaimed and that, after a date specified
therein, which shall not be less than 30 days from the date of such publication,
any unclaimed balance of such money then remaining will be repaid to the
Company.

            (e) Neither the Company nor any Affiliate of the Company shall act
as Paying Agent under this Indenture.


                                      -54-
<PAGE>   61
      10.4. Statement by Officers as to Default.

            The Company shall deliver to the Trustee, as soon as possible and in
any event within five days after the Company becomes aware of the occurrence of
any Event of Default or an event which, with notice or the lapse of time or
both, would constitute an Event of Default, an Officers' Certificate setting
forth the details of such Event of Default or default and the action which the
Company proposes to take with respect thereto.

      10.5. Statement as to Compliance.

            The Company will deliver to the Trustee commencing on the fifteenth
day of February next following the first issuance of any Securities, and
annually thereafter for so long as any Securities remain Outstanding, a
certificate, from its principal executive officer, principal financial officer
or principal accounting officer, stating whether or not to the best knowledge of
the signer thereof the Company is in compliance (without regard to periods of
grace or notice requirements) with all conditions and covenants under this
Indenture, and if the Company shall not be in compliance, specifying such
non-compliance and the nature and status thereof of which such signer may have
knowledge.

11.   REDEMPTION OF SECURITIES

      11.1. Applicability of Article.

            Securities of any series which are redeemable before their stated
maturity shall be redeemable in accordance with their terms and (except as
otherwise specified as contemplated by Section 3.1 for Securities of any series)
in accordance with this article.

      11.2. Election to Redeem; Notice to Trustee.

            The election of the Company to redeem any Securities shall be
evidenced by a Board Resolution. In case of any redemption at the election of
the Company of less than all the Securities of any series, the Company shall, at
least 60 days prior to the Redemption Date fixed by the Company (unless a
shorter notice shall be satisfactory to the Trustee), notify the Trustee of such
Redemption Date and of the principal amount of Securities of such series to be
redeemed. In the case of any redemption of Securities prior to the expiration of
any restriction on such redemption provided in the terms of such Securities or
elsewhere in this Indenture, the Company shall furnish the Trustee with an
Officers' Certificate evidencing compliance with such restriction.

      11.3. Selection by Trustee of Securities to be Redeemed.

            (a) If less than all the Securities of any series are to be
redeemed, the particular Securities to be redeemed shall be selected not less
than 45 days prior to the Redemption Date by the Trustee, from the Outstanding
Securities of such series not previously called for redemption, by such method
as the Trustee shall deem fair and appropriate and 


                                      -55-
<PAGE>   62
which may provide for the selection for redemption of portions (equal to the
minimum authorized denominations for Securities of that series or any integral
multiple thereof) of the principal amount of Securities of such series or of a
denomination larger than the minimum authorized denomination for Securities of
that series.

            (b) The Trustee shall promptly notify the Company in writing of the
Securities selected for redemption and, in case of any Securities selected for
partial redemption, the principal amount thereof to be redeemed.

            (c) For the purposes of any such selection, the Company will, upon
request of the Trustee, close for a period of 15 days preceding the mailing of
any notice of redemption the Security Register of the Company with respect to
such series of Securities.

            (d) For all purposes of this Indenture, unless the context otherwise
requires, all provisions relating to the redemption of Securities shall relate,
in the case of any Securities redeemed or to be redeemed only in part, to the
portion of the principal amount of such Securities which has been or is to be
redeemed.

      11.4. Notice of Redemption.

            Notice of redemption shall be given by first-class mail, postage
prepaid, mailed not less than 30 nor more than 60 days prior to the Redemption
Date, to each Holder of Securities to be redeemed, at the address of such Holder
appearing in the Security Register. The notice provided in the manner herein
provided shall be conclusively presumed to have been duly given whether or not
the Holders receive such notice. In any case, failure to give such notice to the
Holder of any Security designated for redemption as a whole or in part shall not
affect the validity of the proceedings of the redemption of any other Security.

      11.5. Deposit of Redemption Price.

            Prior to any Redemption Date, the Company shall deposit with the
Trustee or with a Paying Agent an amount of money sufficient to pay the
Redemption Price of, and (except if the Redemption Date shall be an Interest
Payment Date) accrued interest on, all the Securities which are to be redeemed
on that date.

      11.6. Securities Payable on Redemption Date.

            (a) Notice of redemption having been given as aforesaid, the
Securities so to be redeemed shall, on the Redemption Date, become due and
payable at the Redemption Price therein specified, and from and after such date,
(unless the Company shall default in the payment of the Redemption Price and
accrued interest) such Securities shall cease to bear interest. Upon surrender
of any such security for redemption in accordance with said notice, such
Security shall be paid by the Company at the Redemption Date together with
accrued interest to the Redemption Date; provided, however, that installments of
interest whose due date is on or prior to the Redemption Date shall be payable
to the Holders of such Securities, or one or more 


                                      -56-
<PAGE>   63
Predecessor Securities, registered as such at the close of business on the
relevant date with respect to such installments of interest according to their
terms and the provision of Section 3.7.

            (b) If any Security called for redemption shall not be so paid upon
surrender thereof for redemption, the principal (and premium, if any) shall,
until paid, bear interest from the Redemption Date at the rate prescribed
therefor in the Security.

      11.7. Securities Redeemed in Part.

            Any Security which is to be redeemed only in part shall be
surrendered at a specified place of payment therefor (with, if the Company or
the Trustee so require, due endorsement by, or a written instrument of transfer
in form satisfactory to the Company and the Trustee duly executed by, the Holder
thereof or his attorney duly authorized in writing), and the Company shall
execute, and the Trustee shall authenticate and deliver to the Holder of such
Security without service charge, a new Security or Securities of the same
series, of any authorized denomination as requested by such Holder, in aggregate
principal amount equal to and in exchange for the unredeemed portion of the
principal of the Security so surrendered.

12.   SINKING FUNDS

      12.1. Applicability of Article.

            (a) The provisions of this article shall be applicable to any
sinking fund for the retirement of Securities of a series except as otherwise
specified as contemplated by Section 3.1 for Securities of such series.

            (b) The minimum amount of any sinking fund payment provided for by
the terms of the Securities of any series is herein referred to as a "mandatory
sinking fund payment," and any payment in excess of such minimum amount provided
for by the terms of Securities of any series is herein referred to as an
"optional sinking fund payment." If provided for by the terms of Securities of
any series, the cash amount of any sinking fund payment may be subject to
reduction as provided in Section 12.2. Each sinking fund payment shall be
applied to the redemption of Securities of any series as provided for by the
terms of Securities of such series.

      12.2. Satisfaction of Sinking Fund Payments with Securities.

            In lieu of making all or part of any sinking fund payments in
cash with respect to securities of any series, the Company

            (a) may deliver to the Trustee for cancellation Outstanding
Securities of such series (other than any previously called for redemption) and

            (b) may apply as a credit Securities of a series which have been
redeemed either at the election of the Company pursuant to the terms of such
Securities or through the application of permitted optional sinking fund
payments pursuant to the terms of such Securities. In each case in satisfaction
of all or any part of any sinking fund payment with respect to the 


                                      -57-
<PAGE>   64
Securities of such series required to be made pursuant to the terms of such
Securities as provided for by the terms of such series; provided, that such
Securities have not been previously so credited. Such Securities shall be
received and credited for such purpose by the Trustee at the Redemption Price
specified in such Securities for redemption through operation of the sinking
fund and the amount of such sinking fund payment shall be reduced accordingly.

      12.3. Redemption of Securities for Sinking Fund.

            Not less than 60 days prior to each sinking fund payment date for
any series of Securities the Company will deliver to the Trustee an Officers'
Certificate specifying the amount of the next ensuing sinking fund payment for
that series pursuant to the terms of the series, the portion thereof, if any,
which is to be satisfied by payment of cash and the portion thereof, if any,
which is to be satisfied by delivering and crediting Securities of that series
pursuant to Section 12.2 and will also deliver to the Trustee any securities to
be so delivered. Not less than 30 days before each sinking fund payment date the
Trustee shall select the Securities to be redeemed upon such sinking fund
payment in the manner specified in Section 11.3 and cause notice of the
redemption thereof to be given in the name of and at the expense of the Company
in the manner provided in Section 11.4. Such notice having been duly given, the
redemption of such Securities shall be made upon the terms and in the manner
stated in Sections 11.6 and 11.7.

13.   SUBORDINATION

      13.1. Applicability of Article.

            The provisions of the article shall be applicable to the Securities
of any series which are subordinated in accordance with their terms as
contemplated by Section 3.1 to any Senior Indebtedness.

      13.2. Securities Subordinated to Senior Indebtedness.

            (a) The Company, for itself and its successors, and each Holder, by
his acceptance of Securities, agrees that the payment of the principal of and
interest on the Securities is subordinated, to the extent and in the manner
provided in this article (except as otherwise specified or contemplated by
Section 3.1 for such series of Securities) to the prior payment in full of all
Senior Indebtedness.

            (b) This Article shall constitute a continuing offer to all persons
who, in reliance upon such provisions, become holders of, or continue to hold,
Senior Indebtedness, and such provisions are made for the benefit of the holders
of Senior Indebtedness, and such holders are made obligees hereunder and each of
them may enforce such provisions.

      13.3. No Payment on Securities in Certain Circumstances.

            (a) Upon the maturity of any Senior Indebtedness by lapse of time,
acceleration or otherwise, all principal thereof and interest thereon and other
amounts due in 


                                      -58-
<PAGE>   65
connection therewith shall first be paid in full, or such payment duly provided
for in accordance with the terms of such indebtedness or in a manner otherwise
satisfactory to the holders of such Senior Indebtedness, before any payment is
made

                  (i) on account of principal of or interest on the Securities
            or

                  (ii) to acquire any of the Securities for cash or property
            other than Capital Stock of the Company or

                  (iii) on account of the redemption provisions for the
            Securities.

            (b) Upon the happening of an event of default (or if an event of
default would result upon any payment with respect to the Securities) with
respect to any Senior Indebtedness, as such event of default is defined therein
or in the instrument under which it is outstanding permitting the holders to
accelerate the maturity thereof and (if the default is other than (i) default in
payment of the principal of or interest on or other amounts due in connection
with such Senior Indebtedness or (ii) a default for which notice is required to
be sent under the terms of such Senior Indebtedness by the holders thereof or
their representative) upon written notice thereof given to the Company and the
Trustee by the holders of such Senior Indebtedness or their representative,
then, unless and until such event of default shall have been cured or waived or
shall have ceased to exist, no payment shall be made by the Company with respect
to the principal of or interest on the Securities or to acquire any of the
Securities or on account of the redemption provisions for the Securities;
provided, however, that if such default is a default other than a default
referred to in Clause (i) of this Section 13.3.(b), nothing contained in this
Section 13.3.(b) shall prevent the Company from making payments of interest,
when due, on the Securities; and provided further, that if such default has not
become the subject of pretrial proceedings within 120 days after the occurrence
thereof (in the case of a default specified in clause (A) of this Section
13.3.(b)), then the Company shall resume making any and all required payments in
respect of the Securities.

            (c) In the event that notwithstanding the provisions of this Section
13.3, the Company shall make any payment to the Trustee on account of the
principal of or interest on the Securities or on account of the redemption
provisions (other than as permitted by Section 13.3.(b)), after the happening of
an event of default of the type specified in Clause (i) or (ii) of Section
13.3.(b) above or after receipt by the Company and the Trustee of written notice
as provided in Section 13.3.(b) above of any other event of default with respect
to any Senior Indebtedness, then, unless and until such event of default shall
have been cured or waived or shall have ceased to exist, such payment (subject
to the provisions of Sections 13.7 and 23.8) shall be held by the Trustee, in
trust for the benefit of, and shall be paid forthwith over and delivered to, the
holders of Senior Indebtedness (pro rata as to each of such holders on the basis
of the respective amounts of Senior Indebtedness held by them) or their
representative, as their respective interests may appear, for application to the
payment of all Senior Indebtedness remaining unpaid to the extent necessary to
pay all Senior Indebtedness in full in accordance with its terms, after giving
effect to any concurrent payment or distribution to or for the holders of Senior
Indebtedness. The Company shall give prompt written notice to the Trustee of any


                                      -59-
<PAGE>   66
default under any Senior Indebtedness or under any agreement pursuant to which
Senior Indebtedness may have been issued.

      13.4. Securities Subordinated to Prior Payment of All Senior Indebtedness
            on Dissolution, Liquidation or Reorganization of Company.

            Upon any distribution of assets of the Company upon any dissolution,
winding up, liquidation or reorganization of the Company (whether in bankruptcy,
insolvency or receivership proceedings or upon an assignment for the benefit of
creditors or otherwise):

            (a) the holders of all Senior Indebtedness shall first be entitled
to receive payment in full (or to have such payment duly provided for) of the
principal thereof and interest due thereon and other amounts due in connection
therewith before the Holders are entitled to receive any payment on account of
the principal of or interest on the Securities;

            (b) any payment or distribution of assets of the Company of any kind
or character, whether in cash, property or securities, to which the Holders or
the Trustee on behalf of the Holders would be entitled except for the provisions
of this article, shall be paid by the liquidating trustee or agent or other
person making such payment or distribution directly to the holders of Senior
Indebtedness or their representative to the extent necessary to make payment in
full of all Senior Indebtedness remaining unpaid, after giving effect to any
concurrent payment or distribution or provision therefor to the holders of such
Senior Indebtedness; and

            (c) in the event that, notwithstanding the foregoing, any payment or
distribution of assets of the Company of any kind or character, whether in cash,
property or securities, shall be reflected by the Trustee or the Holders or any
Paying Agent (or, if the Company is acting as its own Paying Agent, money for
any such payment or distribution shall be segregated or held in trust) on
account of principal of or interest on the Securities before all Senior
Indebtedness is paid in full, or effective provision made for its payment, such
payment or distribution (subject to the provisions of Sections 13.7 and 13.8)
shall be received and held in trust for and shall be paid over to the holders of
the Senior Indebtedness until all such Senior Indebtedness shall have been paid
in full, after giving effect to any concurrent payment or distribution or
provision therefor to the holders of such Senior Indebtedness.

            The Company shall give prompt written notice to the Trustee of any
dissolution, winding up, liquidation or reorganization of the Company or any
assignment for the benefit of the Company's creditors.

      13.5. Securityholders to be Subrogated to Rights of Holders of Senior
            Indebtedness.

            Subject to the payment in full of all Senior Indebtedness, the
Holders of Securities shall be subrogated to the rights of the holders of Senior
Indebtedness to receive payments or distributions of assets of the Company
applicable to the Senior Indebtedness until all amounts owing on the Securities
shall be paid in full, and for the purpose of such subrogation no such payments
or distributions to the holders of Senior Indebtedness by or on 


                                      -60-
<PAGE>   67
behalf of the Company or by or on behalf of the Holders by virtue of this
article which otherwise would have been made to the Holders shall, as between
the Company and the Holders, be deemed to be payment by the Company to or on
account of the Senior Indebtedness, it being understood that the provisions of
this article are and are intended solely for the purpose of defining the
relative rights of the Holders, on the one hand, and the holders of Senior
Indebtedness, on the other hand.

      13.6. Obligations of the Company Unconditional.

            Nothing contained in this article or elsewhere in this Indenture or
in any Security is intended to or shall impair, as between the Company and the
Holders, the obligation of the Company, which is absolute and unconditional, to
pay to the Holders the principal of and interest on the Securities as and when
the same shall become due and payable in accordance with their terms, or is
intended to or shall affect the relative rights of the Holders and creditors of
the Company other than the holders of Senior Indebtedness, nor shall anything
herein or therein prevent the Trustee or any Holder from exercising all remedies
otherwise permitted by applicable law upon default under this Indenture, subject
to the rights, if any, under this article of the Holder of Senior Indebtedness
in respect of cash, property or securities of the Company received upon the
exercise of any such remedy. Upon any distribution of assets of the Company
referred to in this article, the Trustee, subject to the provisions of Sections
6.1 and 6.3, and the Holders shall be entitled to rely upon any order or decree
made by any court of competent jurisdiction in which such dissolution, winding
up, liquidation, reorganization or similar proceedings are pending, or a
certificate of the liquidating trustee or agent or other person making any
distribution to the Trustee or to the Holders, for the purpose of ascertaining
the persons entitled to participate in such distribution, the holders of Senior
Indebtedness and other Indebtedness of the Company, the amount thereof or
payable thereon, the amount or amounts paid or distributed thereon and all other
facts pertinent thereto or to this article.

      13.7. Trustee and Paying Account Entitled to Assume Payments Not
            Prohibited in Absence of Notice.

            The Trustee and Paying Agent shall not at any time be charged with
knowledge of the existence of any facts which would prohibit the making of any
payment to or by the Trustee or the Paying Agent or the taking of any other
action under this article by the Trustee unless and until the Trustee or the
Paying Agent shall have received written notice thereof from the Company or from
one or more holders of Senior Indebtedness or from any representative therefor
and, prior to the receipt of any such written notice, the Trustee and Paying
Agent, subject to the provisions of Sections 6.1 and 6.3, shall be entitled in
all respects conclusively to assume that no such facts exist.

      13.8. Application by Trustee of Moneys Deposited With It.

            Money or securities deposited in trust with the Trustee pursuant to
and in accordance with Section 10.1 shall be for the sole benefit of
Securityholders and, to the extent 


                                      -61-
<PAGE>   68
allocated for the payment of Securities, shall not be subject to the
subordination provisions of this article. Otherwise, any deposit of moneys by
the Company with the Trustee or any Paying Agent (whether or not in trust) for
the payment of the principal of or interest on any Securities shall be subject
to the provisions of Sections 13.1, 13.2, 13.3, 13.4 and 13.5 except that, if
two Business Days prior to the date on which by the terms of this Indenture any
such moneys may become payable for any purpose (including, without limitation,
the payment of either the principal of or the interest, on any Security), the
Trustee shall not have received with respect to such monies the notice provided
for in Section 13.7, then the Trustee or the Paying Agent shall have full power
and authority to receive such moneys and to apply the same to the purpose for
which they were received, and shall not be affected by any notice to the
contrary which may be received by it during or after such two Business Days.
This section shall be construed solely for the benefit of the Trustee and Paying
Agent and nothing herein shall be construed to relieve any Holders from the
duties imposed upon them under Section 13.4.(c) with respect to moneys received
in violation of the provisions of this article.

      13.9. Subordination Rights Not Impaired by Acts or Omissions of Company or
            Holders of Senior Indebtedness.

            No right of any present or future holders of any Senior Indebtedness
to enforce subordination as provided herein shall at any time in any way be
prejudiced or impaired by any act or failure to act, in good faith, by any such
holder, or by any noncompliance by the Company with the terms of this Indenture,
regardless of any knowledge thereof which any such holder may have or be
otherwise charged with. The holders of Senior Indebtedness may extend, renew,
modify or amend the terms of the Senior Indebtedness or any security therefor
and release, sell or exchange such security and otherwise deal freely with the
Company, all without affecting the liabilities and obligations of the parties to
the Indenture or the Holders. No provision in any supplemental indenture which
affects the superior position of the holders of the Senior Indebtedness shall be
effective against the holders of the Senior Indebtedness who have not consented
thereto.

     13.10. Securityholders Authorize Trustee to Effectuate Subordination of
            Securities.

            Each Holder by his acceptance of Securities authorizes and expressly
directs the Trustee on his behalf to take such action as may be necessary or
appropriate to effectuate the subordination provided in this article and
appoints the Trustee his attorney-in-fact for such purpose, including, in the
event of any dissolution, winding up, liquidation or reorganization of the
Company (whether in bankruptcy, insolvency, receivership, reorganization or
similar proceedings or upon an assignment for the benefit of creditors or any
other similar remedy or otherwise) tending towards liquidation of the business
and assets of the Company, the immediate filing of a claim for the unpaid
balance of his Securities in the form required in said proceedings and causing
said claim to be approved. If the Trustee does not file a proper claim or proof
of debt in the form required in such proceeding prior to 30 days before the
expiration of the time to file such claim or claims, then the holders of Senior
Indebtedness are hereby authorized to have the right to file and are hereby
authorized to file an appropriate claim for and on behalf of the Holders.


                                      -62-
<PAGE>   69
     13.11. Right of Trustee and Paying Agent to Hold Senior Indebtedness.

            The Trustee and the Paying Agent, in their individual capacities,
shall be entitled to all of the rights set forth in this article in respect of
any Senior Indebtedness at any time held by either of them to the same extent
any other holder of Senior Indebtedness, and nothing in this indenture shall be
construed to deprive the Trustee or the Paying Agent of any of its rights as
such Holder.

     13.12. This Article Not to Prevent Events of Default.

            The failure to make a payment on account of principal of or interest
on the Securities by reason of any provision of this article shall not be
construed as preventing the occurrence of an Event of Default under Section 5.1.

     13.13. No Fiduciary Duty Created to Holders of Senior Indebtedness.

            The Trustee shall not be deemed to owe any fiduciary duty to the
holders of Senior Indebtedness and shall not be liable to any such holders if
the Trustee shall in good faith mistakenly pay over or distribute to Holders of
Securities or to the Company or to any other person cash, property or securities
to which any holders of Senior Indebtedness shall be entitled by virtue of this
Article or otherwise. With respect to the holders of Senior Indebtedness, the
Trustee undertakes to perform or to observe only such of its covenants or
obligations as are specifically set forth in this Article and no implied
covenants or obligations with respect to holders of Senior Indebtedness shall be
read into this Indenture against the Trustee.

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


                                      -63-
<PAGE>   70
            IN WITNESS WHEREOF, the parties hereto have caused this 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.


                                    OSI PHARMACEUTICALS, INC.



                                    By: /s/
                                        -------------------------------------
                                        Title:



                                    THE BANK OF NEW YORK,
                                    as Trustee



                                    By: /s/
                                        -------------------------------------
                                        Title:


                                      -64-
<PAGE>   71
                                                                       EXHIBIT 1


                              FORM OF ONE YEAR NOTE

                             [Form of Face of Note]

Number                                                              $___________
                                                              CUSIP No._________

                              ONE YEAR NOTE -- [ ]%

                            OSI PHARMACEUTICALS, INC.


Due __________________

            OSI Pharmaceuticals, Inc., a corporation duly organized and existing
under the laws of the State of Delaware (herein referred to as the "Company"),
for value received, hereby promises to pay to ____________________, or _______
registered assigns, the principal sum of _____________________ at the office or
agency of the Company in _____________________, on _____________________, (the
"Due Date"), in such coin or currency of the United States of America as at the
time of payment shall be legal tender for the payment of public and private
debts, and to pay interest, on each Interest Payment Date (as defined herein) on
said principal sum at said office or agency, in like coin or currency, at the
rate per annum specified in the title of this Note from the Interest Payment
Date next preceding the date of this Note to which interest has been paid or
duly provided for, unless the date thereof is a date to which interest has been
paid or duly provided for, in which case from the date of this Note, or unless
no interest has been paid or duly provided for on the Notes since the Original
Issue Date (as defined in the Indenture referred to on the reverse hereto) of
this Note, then from such Original Issue Date, until payment of said principal
sum has been made or duly provided for. The interest so payable on any Interest
Payment Date will, subject to certain exceptions provided in the Indenture, be
paid to the person in whose name this Note is registered at the close of
business on the fifteenth day preceding such Interest Payment Date (the "Record
Date" corresponding to such Interest Payment Date), whether or not such Interest
Payment Date is a business day, and may, at the option of the Company, be paid
by check mailed to the registered address of such person. Notwithstanding the
foregoing, if the date hereof is after the Record Date corresponding to an
Interest Payment Date and before such Interest Payment Date, this Note shall
bear interest from such Interest Payment Date. An "Interest Payment Date" shall
be the dates which are 90, 180 or 270 days after the Original Issue Date of this
Note and the Due Date.

            This Note may be redeemed by the Company at any time in accordance
with the provisions therefore in the Indenture, for a payment in cash equal to
100% of the then outstanding principal sum, plus accrued and unpaid interest to
the Redemption Date.
<PAGE>   72
            Reference is made to the further provisions of this Note set forth
on the reverse hereto. Such further provisions shall for all purposes have the
same affect as though fully set forth at this place.

            This Note shall not be valid or become obligatory for any purpose
until the certificate of authentication hereon shall have been signed by or on
behalf of the Trustee under such Indenture.

            IN WITNESS WHEREOF, OSI Pharmaceuticals, Inc. has caused this
instrument to be executed in its corporate name by the facsimile signatures of
its Chairman of the Board, its President, or one of its Vice Presidents and
attested by its Secretary or one of its Assistant Secretaries and impressed or
imprinted with its corporate seal or a facsimile thereof.

Dated:

                                    OSI PHARMACEUTICALS, INC.



                                    ----------------------------------
                                    Title:

[SEAL]


ATTEST:



- ----------------------------------
Title:


                                       -2-
<PAGE>   73
                     [Form of Certificate of Authentication]

            This is one of the Securities of the series designated pursuant to
the within-mentioned Indenture.

THE BANK OF NEW YORK,               THE BANK OF NEW YORK,
     as Trustee                          as Trustee


                                    OR



By:                                 By:                                 
   ------------------------------      ------------------------------
        Authorized Signatory              as Authenticating Agent


Dated:
      ---------------------------
                                    By:                                 
                                       ------------------------------
                                            Authorized Signatory

                                    Dated:
                                          ---------------------------


                                       -3-
<PAGE>   74
                         [Form of Reverse Side of Note]

                            OSI PHARMACEUTICALS, INC.

                              ONE YEAR NOTE -- [ ]%


            This Note is one of a duly authorized issue of debentures, notes or
other evidences of indebtedness of the Company (hereinafter called the
"Securities") of the series hereinafter specified, all issued or to be issued
under and pursuant to an indenture dated as of January 6, 1999 (herein called
the "Indenture"), duly executed and delivered by the Company to The Bank of New
York, Trustee (herein called the "Trustee"), to which Indenture and all
indentures supplemental thereto reference is hereby made for a description of
the rights, limitations of rights, obligations, duties and immunities thereunder
of the Trustee, the Company and Holders of the Securities. The Securities may be
issued in one or more series, which different series may be issued in various
aggregate principal amounts, may as between different series and within a given
series mature at different times, may bear interest (if any) at different rates,
may be subject to different redemption provisions (if any), may be subject to
different sinking, purchase or analogous funds (if any), and may otherwise vary
as the Indenture provides. This Note is one of a series designated as the One
Year Notes -- [ ]% of the Company (hereinafter called the "Notes"), limited in
aggregate principal amount to the amount issuable upon exercise of the Company's
Rights declared as dividends on January 6, 1999 pursuant to a rights agreement
dated as of January 6, 1999 between the Company and The Bank of New York, as
rights agent.

            Interest on the Notes shall be calculated on the basis of a 360-day
year consisting of twelve 30-day months.

            If an Event of Default, as defined in the Indenture, with respect to
the Notes shall occur and be continuing, the principal of the Notes may be
declared due a payable in the manner and with the effect provided in the
Indenture.

            The Indenture 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 Holders of not less than 80% in principal amount of the
Securities at the time Outstanding (as that term is defined in the Indenture) of
each series to be affected. The Indenture also contains provisions permitting
the Holders of 80% in aggregate 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 Note shall be conclusive and
binding upon such Holder and upon all future Holders of this Note and of any
Security issued upon the registration of transfer hereof or in exchange hereof
or in lieu hereof, whether or not notation of such consent or waiver is made
upon this Note.
<PAGE>   75
            No reference herein to the Indenture and no provision of this Note
or of the Indenture shall alter or impair the obligation of the Company, which
is absolute and unconditional, to pay the principal of (and premium, if any) and
interest on this Note at the times, place and rate, and in the coin or currency,
herein prescribed.

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

            The Notes are issuable only in registered form without coupons in
denominations of $10 and any integral multiple thereof. As provided in the
Indenture and subject to certain limitations therein set forth, the Notes are
exchangeable for a like aggregate principal amount of Notes 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.

            This Note is subordinated in right of payment to the prior payment
in full of all Senior Indebtedness. "Senior Indebtedness" means the principal of
interest on and other amounts due on or in connection with (i) any Indebtedness
of the Company (other than the Notes), whether outstanding on the date of this
Indenture or hereafter created, incurred, assumed or guaranteed in any manner by
the Company; and (ii) deferrals, renewals, extensions or refundings of, or
amendments, modifications or supplements to, such Indebtedness, unless the
instrument creating or evidencing such Indebtedness or the assumption or
guarantee thereof expressly provides that such Indebtedness shall not be senior
in right of payment to the Notes. Senior Indebtedness shall not, however,
include Indebtedness of the Company to a Subsidiary for money borrowed or
advances from such Subsidiary.

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

            All capitalized terms used in this Note and not defined herein shall
have the meanings assigned to them in the Indenture.


                                      -2-
<PAGE>   76
            This Note shall be deemed to be a contract made under the laws of
the State of New York, and for all purposes shall be construed in accordance
with and governed by the laws of such state.


                                       -3-


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