Exhibit 4.12


 


THRESHOLD PHARMACEUTICALS, INC.,


Issuer


 


AND


 


[TRUSTEE],


Trustee


 


 






 


INDENTURE


 


Dated as of [·],
20__


 


 






 


Debt Securities


 




     


     


    

 


Table
Of Contents


 


	 	 	Page
	 	 	 
	article 1	DEFINITIONS	1
	 	 	 
	Section 1.01	Definitions of Terms	1
	 	 	 
	article 2	ISSUE, DESCRIPTION, TERMS, EXECUTION, REGISTRATION AND EXCHANGE OF SECURITIES	5
	 	 	 
	Section 2.01	Designation and Terms of Securities	5
	 	 	 
	Section 2.02	Form of Securities and Trustee’s Certificate	8
	 	 	 
	Section 2.03	Denominations: Provisions for Payment	8
	 	 	 
	Section 2.04	Execution and Authentications	10
	 	 	 
	Section 2.05	Registration of Transfer and Exchange	10
	 	 	 
	Section 2.06	Temporary Securities	12
	 	 	 
	Section 2.07	Mutilated, Destroyed, Lost or Stolen Securities	12
	 	 	 
	Section 2.08	Cancellation	13
	 	 	 
	Section 2.09	Benefits of Indenture	13
	 	 	 
	Section 2.10	Authenticating Agent	13
	 	 	 
	Section 2.11	Global Securities	14
	 	 	 
	Section 2.12	CUSIP Numbers	15
	 	 	 
	article 3	REDEMPTION OF SECURITIES AND SINKING FUND PROVISIONS	15
	 	 	 
	Section 3.01	Redemption	15
	 	 	 
	Section 3.02	Notice of Redemption	15
	 	 	 
	Section 3.03	Payment Upon Redemption	17
	 	 	 
	Section 3.04	Sinking Fund	17
	 	 	 
	Section 3.05	Satisfaction of Sinking Fund Payments with Securities	17
	 	 	 
	Section 3.06	Redemption of Securities for Sinking Fund	18
	 	 	 
	article 4	COVENANTS	18
	 	 	 
	Section 4.01	Payment of Principal, Premium and Interest	18
	 	 	 
	Section 4.02	Maintenance of Office or Agency	18
	 	 	 
	Section 4.03	Paying Agents	19
	 	 	 
	Section 4.04	Appointment to Fill Vacancy in Office of Trustee	20


 




    i. 


     


    

 


Table
Of Contents


(continued)


 


	 	 	Page
	 	 	 
	article 5	SECURITYHOLDERS’ LISTS AND REPORTS BY THE COMPANY AND THE TRUSTEE	20
	 	 	 
	Section 5.01	Company to Furnish Trustee Names and Addresses of Securityholders	20
	 	 	 
	Section 5.02	Preservation Of Information; Communications With Securityholders	20
	 	 	 
	Section 5.03	Reports by the Company	21
	 	 	 
	Section 5.04	Reports by the Trustee	21
	 	 	 
	article 6	REMEDIES OF THE TRUSTEE AND SECURITYHOLDERS ON EVENT OF DEFAULT	22
	 	 	 
	Section 6.01	Events of Default	22
	 	 	 
	Section 6.02	Collection of Indebtedness and Suits for Enforcement by Trustee	24
	 	 	 
	Section 6.03	Application of Moneys Collected	25
	 	 	 
	Section 6.04	Limitation on Suits	25
	 	 	 
	Section 6.05	Rights and Remedies Cumulative; Delay or Omission Not Waiver	26
	 	 	 
	Section 6.06	Control by Securityholders	27
	 	 	 
	Section 6.07	Undertaking to Pay Costs	27
	 	 	 
	article 7	CONCERNING THE TRUSTEE	28
	 	 	 
	Section 7.01	Certain Duties and Responsibilities of Trustee	28
	 	 	 
	Section 7.02	Certain Rights of Trustee	29
	 	 	 
	Section 7.03	Trustee Not Responsible for Recitals or Issuance or Securities	31
	 	 	 
	Section 7.04	May Hold Securities	31
	 	 	 
	Section 7.05	Moneys Held in Trust	31
	 	 	 
	Section 7.06	Compensation and Reimbursement	32
	 	 	 
	Section 7.07	Reliance on Officer’s Certificate	32
	 	 	 
	Section 7.08	Disqualification; Conflicting Interests	32
	 	 	 
	Section 7.09	Corporate Trustee Required; Eligibility	33
	 	 	 
	Section 7.10	Resignation and Removal; Appointment of Successor	33
	 	 	 
	Section 7.11	Acceptance of Appointment By Successor	34
	 	 	 
	Section 7.12	Merger, Conversion, Consolidation or Succession to Business	36
	 	 	 
	Section 7.13	Preferential Collection of Claims Against the Company	36


 




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Table
Of Contents


(continued)


 


	 	 	Page
	 	 	 
	Section 7.14	Notice of Default	36
	 	 	 
	article 8	CONCERNING THE SECURITYHOLDERS	36
	 	 	 
	Section 8.01	Evidence of Action by Securityholders	36
	 	 	 
	Section 8.02	Proof of Execution by Securityholders	37
	 	 	 
	Section 8.03	Who May be Deemed Owners	37
	 	 	 
	Section 8.04	Certain Securities Owned by Company Disregarded	37
	 	 	 
	Section 8.05	Actions Binding on Future Securityholders	38
	 	 	 
	article 9	SUPPLEMENTAL INDENTURES	38
	 	 	 
	Section 9.01	Supplemental Indentures Without the Consent of Securityholders	38
	 	 	 
	Section 9.02	Supplemental Indentures With Consent of Securityholders	39
	 	 	 
	Section 9.03	Effect of Supplemental Indentures	40
	 	 	 
	Section 9.04	Securities Affected by Supplemental Indentures	40
	 	 	 
	Section 9.05	Execution of Supplemental Indentures	40
	 	 	 
	article 10	SUCCESSOR ENTITY	41
	 	 	 
	Section 10.01	Company May Consolidate, Etc	41
	 	 	 
	Section 10.02	Successor Entity Substituted	41
	 	 	 
	ARTICLE 11	SATISFACTION AND DISCHARGE	42
	 	 	 
	Section 11.01	Satisfaction and Discharge of Indenture	42
	 	 	 
	Section 11.02	Discharge of Obligations	43
	 	 	 
	Section 11.03	Deposited Moneys to be Held in Trust	43
	 	 	 
	Section 11.04	Payment of Moneys Held by Paying Agents	43
	 	 	 
	Section 11.05	Repayment to Company	43
	 	 	 
	article 12	IMMUNITY OF INCORPORATORS, STOCKHOLDERS, OFFICERS AND DIRECTORS	43
	 	 	 
	Section 12.01	No Recourse	43
	 	 	 
	article 13	MISCELLANEOUS PROVISIONS	44
	 	 	 
	Section 13.01	Effect on Successors and Assigns	44
	 	 	 
	Section 13.02	Actions by Successor	44
	 	 	 
	Section 13.03	Surrender of Company Powers	44
	 	 	 
	Section 13.04	Notices	45
	 	 	 
	Section 13.05	Governing Law; Jury Trial Waiver	45


 




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Table
Of Contents


(continued)


 


	 	 	Page
	 	 	 
	Section 13.06	Treatment of Securities as Debt	45
	 	 	 
	Section 13.07	Certificates and Opinions as to Conditions Precedent	45
	 	 	 
	Section 13.08	Payments on Business Days	46
	 	 	 
	Section 13.09	Conflict with Trust Indenture Act	46
	 	 	 
	Section 13.10	Counterparts	46
	 	 	 
	Section 13.11	Separability	46
	 	 	 
	Section 13.12	Compliance Certificates	47
	 	 	 
	Section 13.13	U.S.A. Patriot Act	47
	 	 	 
	Section 13.14	Force Majeure	47
	 	 	 
	Section 13.15	Table of Contents; Headings	47
	 	 	 
	Section 13.13	Patriot Act	45
	 	 	 
	Section 13.14	Force Majeure	45
	 	 	 
	Section 13.12	Table of Contents; Headings	45


 




    iv. 


     


    

 


INDENTURE


 


Indenture,
dated as of [·], 20__, among Threshold Pharmaceuticals, Inc.,
a Delaware corporation (the “Company”), and [Trustee],
as trustee (the “Trustee”):


 


Whereas,
for its lawful corporate purposes, the Company has duly authorized the execution and delivery of this Indenture to provide for
the issuance of debt securities (hereinafter referred to as the “Securities”), in an unlimited aggregate principal
amount to be issued from time to time in one or more series as in this Indenture provided, as registered Securities without coupons,
to be authenticated by the certificate of the Trustee;


 


Whereas,
to provide the terms and conditions upon which the Securities are to be authenticated, issued and delivered, the Company has duly
authorized the execution of this Indenture; and


 


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


 


Now,
Therefore, in consideration of the premises and the purchase of the Securities by the holders thereof, it is mutually
covenanted and agreed as follows for the equal and ratable benefit of the holders of Securities:


 


article
1



DEFINITIONS


 


Section 1.01         Definitions
of Terms.


 


The terms defined in this
Section (except as in this Indenture or any indenture supplemental hereto otherwise expressly provided or unless the context otherwise
requires) for all purposes of this Indenture and of any indenture supplemental hereto shall have the respective meanings specified
in this Section and shall include the plural as well as the singular. All other terms used in this Indenture that are defined in
the Trust Indenture Act of 1939, as amended, or that are by reference in such Act defined in the Securities Act of 1933, as amended
(except as herein or any indenture supplemental hereto otherwise expressly provided or unless the context otherwise requires),
shall have the meanings assigned to such terms in said Trust Indenture Act and in said Securities Act as in force at the date of
the execution of this instrument.


 


“Authenticating
Agent” means the Trustee or an authenticating agent with respect to all or any of the series of Securities appointed
by the Trustee pursuant to Section 2.10.


 


“Bankruptcy
Law” means Title 11, U.S. Code, or any similar federal or state law for the relief of debtors.


 


“Board of Directors”
means the Board of Directors (or the functional equivalent thereof) of the Company or any duly authorized committee of such Board.


 




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“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 (or duly authorized committee thereof) and to be in full force and effect on the date of such certification.


 


“Business Day”
means, with respect to any series of Securities, any day other than a day on which federal or state banking institutions in the
Borough of Manhattan, the City of New York, or in the city of the Corporate Trust Office of the Trustee, are authorized or obligated
by law, executive order or regulation to close.


 


“Commission”
means the Securities and Exchange Commission, as from time to time constituted, created under the Exchange Act, 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.


 


“Company”
means Threshold Pharmaceuticals, Inc., a corporation duly organized and existing under the laws of the State of Delaware, and,
subject to the provisions of Article Ten, shall also include its successors and assigns.


 


“Corporate
Trust Office” means the office of the Trustee at which, at any particular time, its corporate trust business shall
be principally administered, which office at the date hereof is located at                                  
                                                                                                .


 


“Custodian”
means any receiver, trustee, assignee, liquidator or similar official under any Bankruptcy Law.


 


“Defaulted
Interest” has the meaning set forth in Section 2.03.


 


“Depositary”
means, with respect to Securities of any series for which the Company shall determine that such Securities will be issued as a
Global Security, The Depository Trust Company, another clearing agency, or any successor registered as a clearing agency under
the Exchange Act, or other applicable statute or regulation, which, in each case, shall be designated by the Company pursuant to
either Section 2.01 or 2.11.


 


“Event of Default”
means, with respect to Securities of a particular series, any event specified in Section 6.01, continued for the period of time,
if any, therein designated.


 


“Exchange Act”
means the United States Securities and Exchange Act of 1934, as amended, and the rules and regulations promulgated by the Commission
thereunder.


 


“Global Security”
means a Security issued to evidence all or a part of any series of Securities which is executed by the Company and authenticated
and delivered by the Trustee to the Depositary or pursuant to the Depositary’s instruction, all in accordance with the Indenture,
which shall be registered in the name of the Depositary or its nominee.


 




     2


     


    

 


“Governmental
Obligations” means securities that are (a) direct obligations of the United States of America for the payment
of which its full faith and credit is pledged or (b) obligations of a Person controlled or supervised by and acting as an
agency or instrumentality of the United States of America, the payment of which is unconditionally guaranteed as a full faith and
credit obligation by the United States of America that, in either case, are not callable or redeemable at the option of the issuer
thereof at any time prior to the stated maturity of the Securities, and shall also include a depositary receipt issued by a bank
or trust company as custodian with respect to any such Governmental Obligation or a specific payment of principal of or interest
on any such Governmental Obligation held by such custodian for the account of the holder of such depositary receipt; provided,
however, that (except as required by law) such custodian is not authorized to make any deduction from the amount payable to the
holder of such depositary receipt from any amount received by the custodian in respect of the Governmental Obligation or the specific
payment of principal of or interest on the Governmental Obligation evidenced by such depositary receipt.


 


“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.


 


“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 in accordance with the terms hereof and shall include the terms of particular series of Securities
established as contemplated by Section 2.01.


 


“Interest Payment
Date”, when used with respect to any installment of interest on a Security of a particular series, means the date
specified in such Security or in a Board Resolution or in an indenture supplemental hereto with respect to such series as the fixed
date on which an installment of interest with respect to Securities of that series is due and payable.


 


“Officer”
means, with respect to the Company, the chairman of the Board of Directors, a chief executive officer, a president, a chief financial
officer, a chief operating officer, any executive vice president, any senior vice president, any vice president, the treasurer
or any assistant treasurer, the controller or any assistant controller or the secretary or any assistant secretary.


 


“Officer’s
Certificate” means a certificate signed by any Officer. Each such certificate shall include the statements provided
for in Section 13.07, if and to the extent required by the provisions thereof.


 


“Opinion of
Counsel” means an opinion in writing subject to customary exceptions of legal counsel, who may be an employee of
or counsel for the Company, that is delivered to the Trustee in accordance with the terms hereof. Each such opinion shall include
the statements provided for in Section 13.07, if and to the extent required by the provisions thereof.


 


“Outstanding”,
when used with reference to Securities of any series, means, subject to the provisions of Section 8.04, as of any particular time,
all Securities of that series theretofore authenticated and delivered by the Trustee under this Indenture, except (a) Securities
theretofore canceled by the Trustee or any paying agent, or delivered to the Trustee or any paying agent for cancellation or that
have previously been canceled; (b) Securities or portions thereof for the payment or redemption of which moneys or Governmental
Obligations in the necessary amount shall have been deposited in trust with the Trustee or with any paying agent (other than the
Company) or shall have been set aside and segregated in trust by the Company (if the Company shall act as its own paying agent);
provided, however, that if such Securities or portions of such Securities are to be redeemed prior to the maturity thereof, notice
of such redemption shall have been given as provided in Article Three, or provision satisfactory to the Trustee shall have been
made for giving such notice; and (c) Securities in lieu of or in substitution for which other Securities shall have been authenticated
and delivered pursuant to the terms of Section 2.07.


 




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“Person”
means any individual, corporation, partnership, joint venture, joint-stock company, limited liability company, association, trust,
unincorporated organization, any other entity or organization, including a government or political subdivision or an agency or
instrumentality thereof.


 


“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 2.07 in lieu of a lost, destroyed or stolen Security shall be deemed to evidence the same debt as the lost, destroyed
or stolen Security.


 


“Responsible
Officer” when used with respect to the Trustee means any officer within the Corporate Trust Office of the Trustee
(or any successor group of the Trustee) 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 or her knowledge of and familiarity with the particular subject and in each case
who shall have direct responsibility for the administration of this Indenture assigned by the Trustee to administer its corporate
trust matters with respect to this Indenture (which, for the avoidance of doubt, includes without limitation any supplemental indenture
hereto).


 


“Securities”
has the meaning stated in the first recital of this Indenture and more particularly means any Securities authenticated and delivered
under this Indenture.


 


“Securities Act” means
the Securities Act of 1933, as amended.


 


“Securityholder”,
“holder of Securities”, “registered holder”, or other similar term, means the
Person or Persons in whose name or names a particular Security is registered on the Security Register kept for that purpose in
accordance with the terms of this Indenture.


 


“Security Register”
and “Security Registrar” shall have the meanings as set forth in Section 2.05.


 


“Subsidiary” means,
with respect to any Person, any corporation, association, partnership or other business entity of which more than 50% of the total
voting power of shares of capital stock or other interests (including partnership interests) entitled (without regard to the occurrence
of any contingency) to vote in the election of directors, managers, general partners or trustees thereof is at the time owned or
controlled, directly or indirectly, by (i) such Person; (ii) such Person and one or more Subsidiaries of such Person; or (iii)
one or more Subsidiaries of such Person.


 




     4


     


    

 


“Trustee”
means _________________________, and, subject to the provisions of Article Seven, shall also include its successors and assigns,
and, if at any time there is more than one Person acting in such capacity hereunder, “Trustee” shall mean each such
Person. The term “Trustee” as used with respect to a particular series of the Securities shall mean the trustee with
respect to that series.


 


“Trust Indenture
Act” means the Trust Indenture Act of 1939, as amended.


 


“U.S.A. Patriot
Act” means the Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct
Terrorism Act of 2001, Pub. L. 107-56, as amended and signed into law October 26, 2001.


 


article
2



ISSUE, DESCRIPTION, TERMS, EXECUTION, REGISTRATION AND EXCHANGE OF SECURITIES


 


Section 2.01         Designation
and Terms of Securities.


 


(a)          The
aggregate principal amount of Securities that may be authenticated and delivered under this Indenture is unlimited. The Securities
may be issued in one or more series up to the aggregate principal amount of Securities of that series from time to time authorized
by or pursuant to a Board Resolution or pursuant to one or more indentures supplemental hereto. Prior to the initial issuance of
Securities of any series, there shall be established in or pursuant to a Board Resolution, and set forth in an Officer’s
Certificate, or established in one or more indentures supplemental hereto:


 


(1)         the
title of the Securities of the series (which shall distinguish the Securities of that series from all other Securities);


 


(2)         any
limit upon the aggregate principal amount of the Securities of that series that 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 that series);


 


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


 


(4)         the
form of the Securities of the series including the form of the certificate of authentication for such series;


 


(5)         the
applicability of any guarantees;


 


(6)         whether
or not the Securities will be secured or unsecured, and the terms of any secured debt;


 




     5


     


    

 


(7)         whether
the Securities rank as senior debt, senior subordinated debt, subordinated debt or any combination thereof, and the terms of any
subordination;


 


(8)         if
the price (expressed as a percentage of the aggregate principal amount thereof) at which such Securities will be issued is a price
other than the principal amount thereof, the portion of the principal amount thereof payable upon declaration of acceleration of
the maturity thereof, or if applicable, the portion of the principal amount of such Securities that is convertible into another
security or the method by which any such portion shall be determined;


 


(9)         the
interest rate or rates, which may be fixed or variable, or the method for determining the rate and the date interest will begin
to accrue, the dates interest will be payable and the regular record dates for interest payment dates or the method for determining
such dates;


 


(10)        the
Company’s right, if any, to defer the payment of interest and the maximum length of any such deferral period;


 


(11)        if
applicable, the date or dates after which, or the period or periods during which, and the price or prices at which, the Company
may at its option, redeem the series of Securities pursuant to any optional or provisional redemption provisions and the terms
of those redemption provisions;


 


(12)        the
date or dates, if any, on which, and the price or prices at which the Company is obligated, pursuant to any mandatory sinking fund
or analogous fund provisions or otherwise, to redeem, or at the Securityholder’s option to purchase, the series of Securities
and the currency or currency unit in which the Securities are payable;


 


(13)        the
denominations in which the Securities of the series shall be issuable, if other than denominations of one thousand U.S. dollars
($1,000) or any integral multiple thereof;


 


(14)        any
and all terms, if applicable, relating to any auction or remarketing of the Securities of that series and any security for the
obligations of the Company with respect to such Securities and any other terms which may be advisable in connection with the marketing
of Securities of that series;


 


(15)        whether
the Securities of the series shall be issued in whole or in part in the form of a Global Security or Securities; the terms and
conditions, if any, upon which such Global Security or Securities may be exchanged in whole or in part for other individual Securities;
and the Depositary for such Global Security or Securities;


 


(16)        if
applicable, the provisions relating to conversion or exchange of any Securities of the series and the terms and conditions upon
which such Securities will be so convertible or exchangeable, including the conversion or exchange price, as applicable, or how
it will be calculated and may be adjusted, any mandatory or optional (at the Company’s option or the holders’ option)
conversion or exchange features, the applicable conversion or exchange period and the manner of settlement for any conversion or
exchange, which may, without limitation, include the payment of cash as well as the delivery of securities;


 




     6


     


    

 


(17)        if
other than the full 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 6.01;


 


(18)        additions
to or changes in the covenants applicable to the series of Securities being issued, including, among others, the consolidation,
merger or sale covenant;


 


(19)        additions
to or changes in the Events of Default with respect to the Securities and any change in the right of the Trustee or the Securityholders
to declare the principal, premium, if any, and interest, if any, with respect to such Securities to be due and payable;


 


(20)        additions
to or changes in or deletions of the provisions relating to covenant defeasance and legal defeasance;


 


(21)        additions
to or changes in the provisions relating to satisfaction and discharge of this Indenture;


 


(22)        additions
to or changes in the provisions relating to the modification of this Indenture both with and without the consent of Securityholders
of Securities issued under this Indenture;


 


(23)        the
currency of payment of Securities if other than U.S. dollars and the manner of determining the equivalent amount in U.S. dollars;


 


(24)        whether
interest will be payable in cash or additional Securities at the Company’s or the Securityholders’ option and the terms
and conditions upon which the election may be made;


 


(25)        the
terms and conditions, if any, upon which the Company shall pay amounts in addition to the stated interest, premium, if any and
principal amounts of the Securities of the series to any Securityholder that is not a “United States person” for federal
tax purposes;


 


(26)        any
restrictions on transfer, sale or assignment of the Securities of the series; and


 


(27)        any
other specific terms, preferences, rights or limitations of, or restrictions on, the Securities, any other additions or changes
in the provisions of this Indenture, and any terms that may be required by us or advisable under applicable laws or regulations.


 


All Securities of any one
series shall be substantially identical except as may otherwise be provided in or pursuant to any such Board Resolution or in any
indentures supplemental hereto.


 




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If any of the terms of
the series are established by action taken pursuant to a Board Resolution of the Company, 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 Officer’s Certificate of the Company setting forth the terms of the series.


 


Securities of any particular
series may be issued at various times, with different dates on which the principal or any installment of principal is payable,
with different rates of interest, if any, or different methods by which rates of interest may be determined, with different dates
on which such interest may be payable and with different redemption dates.


 


Section 2.02         Form
of Securities and Trustee’s Certificate.


 


The Securities of any series
and the Trustee’s certificate of authentication to be borne by such Securities shall be substantially of the tenor and purport
as set forth in one or more indentures supplemental hereto or as provided in a Board Resolution, and set forth in an Officer’s
Certificate, and they may have such letters, numbers or other marks of identification or designation and such legends or endorsements
printed, lithographed or engraved thereon as the Company may deem appropriate and as are not inconsistent with the provisions of
this Indenture, or as may be required to comply with any law or with any rule or regulation made pursuant thereto or with any rule
or regulation of any securities exchange on which Securities of that series may be listed, or to conform to usage.


 


Section 2.03         Denominations:
Provisions for Payment.


 


The Securities shall be
issuable as registered Securities and in the denominations of one thousand U.S. dollars ($1,000) or any integral multiple thereof,
subject to Section 2.01(a)(13). The Securities of a particular series shall bear interest payable on the dates and at the rate
specified with respect to that series. Subject to Section 2.01(a)(23), the principal of and the interest on the Securities of any
series, as well as any premium thereon in case of redemption or repurchase thereof prior to maturity, and any cash amount due upon
conversion or exchange thereof, shall be payable in the coin or currency of the United States of America that at the time is legal
tender for public and private debt, at the office or agency of the Company maintained for that purpose. Each Security shall be
dated the date of its authentication. Interest on the Securities shall be computed on the basis of a 360-day year composed of twelve
30-day months.


 


The interest installment
on any Security that is payable, and is punctually paid or duly provided for, on any Interest Payment Date for Securities of that
series shall be paid to the Person in whose name said Security (or one or more Predecessor Securities) is registered at the close
of business on the regular record date for such interest installment. In the event that any Security of a particular series or
portion thereof is called for redemption and the redemption date is subsequent to a regular record date with respect to any Interest
Payment Date and prior to such Interest Payment Date, interest on such Security will be paid upon presentation and surrender of
such Security as provided in Section 3.03.


 


Any interest on any Security
that is payable, but is not punctually paid or duly provided for, on any Interest Payment Date for Securities of the same series
(herein called “Defaulted Interest”) shall forthwith cease to be payable to the registered holder on the relevant regular
record date by virtue of having been such holder; and such Defaulted Interest shall be paid by the Company, at its election, as
provided in clause (1) or clause (2) below:


 




     8


     


    

 


(1)         The
Company may make payment of any Defaulted Interest on Securities to the Persons in whose names such Securities (or their respective
Predecessor Securities) are registered at the close of business on a special record date for the payment of such Defaulted Interest,
which shall be fixed in the following manner: the Company shall notify the Trustee in writing of the amount of Defaulted Interest
proposed to be paid on each such Security and the date of the proposed payment, and at the same time the Company shall deposit
with the Trustee an amount of money equal to the aggregate amount proposed to be paid in respect of such Defaulted Interest or
shall make arrangements satisfactory to the Trustee for such deposit prior to the date of the proposed payment, such money when
deposited to be held in trust for the benefit of the Persons entitled to such Defaulted Interest as in this clause provided. Thereupon
the Trustee shall fix a special record date for the payment of such Defaulted Interest which shall not be more than 15 nor less
than 10 days prior to the date of the proposed payment and not less than 10 days after the receipt by the Trustee of the notice
of the proposed payment. The Trustee shall promptly notify the Company of such special record date and, in the name and at the
expense of the Company, shall cause notice of the proposed payment of such Defaulted Interest and the special record date therefor
to be mailed, first class postage prepaid, to each Securityholder at his or her address as it appears in the Security Register
(as hereinafter defined), not less than 10 days prior to such special record date. Notice of the proposed payment of such Defaulted
Interest and the special record date therefor having been mailed as aforesaid, such Defaulted Interest shall be paid to the Persons
in whose names such Securities (or their respective Predecessor Securities) are registered on such special record date.


 


(2)         The
Company may make payment of any Defaulted Interest on any Securities in any other lawful manner not inconsistent with the requirements
of any securities exchange on which such 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 clause, such manner of payment shall
be deemed practicable by the Trustee.


 


Unless otherwise set forth
in a Board Resolution or one or more indentures supplemental hereto establishing the terms of any series of Securities pursuant
to Section 2.01 hereof, the term “regular record date” as used in this Section with respect to a series of Securities
and any Interest Payment Date for such series shall mean either the fifteenth day of the month immediately preceding the month
in which an Interest Payment Date established for such series pursuant to Section 2.01 hereof shall occur, if such Interest Payment
Date is the first day of a month, or the first day of the month in which an Interest Payment Date established for such series pursuant
to Section 2.01 hereof shall occur, if such Interest Payment Date is the fifteenth day of a month, whether or not such date is
a Business Day.


 


Subject to the foregoing
provisions of this Section, each Security of a series delivered under this Indenture upon transfer of or in exchange for or in
lieu of any other Security of such series shall carry the rights to interest accrued and unpaid, and to accrue, that were carried
by such other Security.


 




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Section 2.04         Execution
and Authentications.


 


The Securities shall be
signed on behalf of the Company by one of its Officers. Signatures may be in the form of a manual or facsimile signature.


 


The Company may use the
facsimile signature of any Person who shall have been an Officer (at the time of execution), notwithstanding the fact that at the
time the Securities shall be authenticated and delivered or disposed of such Person shall have ceased to be such an officer of
the Company. The Securities may contain such notations, legends or endorsements required by law, stock exchange rule or usage.
Each Security shall be dated the date of its authentication by the Trustee.


 


A Security shall not be
valid until authenticated manually by an authorized signatory of the Trustee, or by an Authenticating Agent. Such signature shall
be conclusive evidence that the Security so authenticated has been duly authenticated and delivered hereunder and that the holder
is entitled to the benefits of this Indenture. 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 written
order of the Company for the authentication and delivery of such Securities, signed by an Officer, and the Trustee in accordance
with such written order shall authenticate and deliver such Securities.


 


Upon the Company’s
delivery of any such authentication order to the Trustee at any time after the initial issuance of Securities under this Indenture,
the Trustee shall be provided with, and (subject to Sections 315(a) through 315(d) of the Trust Indenture Act) shall be fully protected
in relying upon, (1) an Opinion of Counsel or reliance letter and (2) an Officer’s Certificate stating that all conditions
precedent to the execution, authentication and delivery of such Securities are in conformity with the provisions of this Indenture.


 


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 in a manner that is not reasonably acceptable
to the Trustee.


 


Section 2.05         Registration
of Transfer and Exchange.


 


(a)          Securities
of any series may be exchanged upon presentation thereof at the office or agency of the Company designated for such purpose, for
other Securities of such series of authorized denominations, and for a like aggregate principal amount, upon payment of a sum sufficient
to cover any tax or other governmental charge in relation thereto, all as provided in this Section. In respect of any Securities
so surrendered for exchange, the Company shall execute, the Trustee shall authenticate and such office or agency shall deliver
in exchange therefor the Security or Securities of the same series that the Securityholder making the exchange shall be entitled
to receive, bearing numbers not contemporaneously outstanding.


 




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(b)          The
Company shall keep, or cause to be kept, at its office or agency designated for such purpose a register or registers (herein referred
to as the “Security Register”) in which, subject to such reasonable regulations as it may prescribe, the Company shall
register the Securities and the transfers of Securities as in this Article provided and which at all reasonable times shall be
open for inspection by the Trustee. The registrar for the purpose of registering Securities and transfer of Securities as herein
provided shall be appointed as authorized by Board Resolution (the “Security Registrar”).


 


Upon surrender for transfer
of any Security at the office or agency of the Company designated for such purpose, the Company shall execute, the Trustee shall
authenticate and such office or agency shall deliver in the name of the transferee or transferees a new Security or Securities
of the same series as the Security presented for a like aggregate principal amount.


 


All Securities presented
or surrendered for exchange or registration of transfer, as provided in this Section, shall be accompanied (if so required by the
Company or the Security Registrar) by a written instrument or instruments of transfer, in form satisfactory to the Company or the
Security Registrar, duly executed by the registered holder or by such holder’s duly authorized attorney in writing.


 


(c)          Except
as provided pursuant to Section 2.01 pursuant to a Board Resolution, and set forth in an Officer’s Certificate, or established
in one or more indentures supplemental to this Indenture, no service charge shall be made for any exchange or registration of transfer
of Securities, or issue of new Securities in case of partial redemption of any series or repurchase, conversion or exchange of
less than the entire principal amount of a Security, but the Company may require payment of a sum sufficient to cover any tax or
other governmental charge in relation thereto, other than exchanges pursuant to Section 2.06, Section 3.03(b) and Section 9.04
not involving any transfer.


 


(d)          The
Company shall not be required (i) to issue, exchange or register the transfer of any Securities during a period beginning at the
opening of business 15 days before the day of the mailing of a notice of redemption of less than all the Outstanding Securities
of the same series and ending at the close of business on the day of such mailing, nor (ii) to register the transfer of or exchange
any Securities of any series or portions thereof called for redemption or surrendered for repurchase, but not validly withdrawn,
other than the unredeemed portion of any such Securities being redeemed in part or not surrendered for repurchase, as the case
may be. The provisions of this Section 2.05 are, with respect to any Global Security, subject to Section 2.11 hereof.


 


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 (including any transfers between or among
depositary participants or beneficial owners of interests in any Global 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.


 




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Section 2.06         Temporary
Securities.


 


Pending the preparation
of definitive Securities of any series, the Company may execute, and the Trustee shall authenticate and deliver, temporary Securities
(printed, lithographed or typewritten) of any authorized denomination. Such temporary Securities shall be substantially in the
form of the definitive Securities in lieu of which they are issued, but with such omissions, insertions and variations as may be
appropriate for temporary Securities, all as may be determined by the Company. Every temporary Security of any series shall be
executed by the Company and be authenticated by the Trustee upon the same conditions and in substantially the same manner, and
with like effect, as the definitive Securities of such series. Without unnecessary delay the Company will execute and will furnish
definitive Securities of such series and thereupon any or all temporary Securities of such series may be surrendered in exchange
therefor (without charge to the holders), at the office or agency of the Company designated for the purpose, and the Trustee shall
authenticate and such office or agency shall deliver in exchange for such temporary Securities an equal aggregate principal amount
of definitive Securities of such series, unless the Company advises the Trustee to the effect that definitive Securities need not
be executed and furnished until further notice from the Company. Until so exchanged, the temporary Securities of such series shall
be entitled to the same benefits under this Indenture as definitive Securities of such series authenticated and delivered hereunder.


 


Section 2.07         Mutilated,
Destroyed, Lost or Stolen Securities.


 


In case any temporary or
definitive Security shall become mutilated or be destroyed, lost or stolen, the Company (subject to the next succeeding sentence)
shall execute, and upon the Company’s request the Trustee (subject as aforesaid) shall authenticate and deliver, a new Security
of the same series, bearing a number not contemporaneously outstanding, in exchange and substitution for the mutilated Security,
or in lieu of and in substitution for the Security so destroyed, lost or stolen. In every case the applicant for a substituted
Security shall furnish to the Company and the Trustee such security or indemnity as may be required by them to save each of them
harmless, and, in every case of destruction, loss or theft, the applicant shall also furnish to the Company and the Trustee evidence
to their satisfaction of the destruction, loss or theft of the applicant’s Security and of the ownership thereof. The Trustee
may authenticate any such substituted Security and deliver the same upon the written request or authorization of any officer of
the Company. Upon the issuance of any substituted Security, 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.


 


In case any Security that
has matured or is about to mature shall become mutilated or be destroyed, lost or stolen, the Company may, instead of issuing a
substitute Security, pay or authorize the payment of the same (without surrender thereof except in the case of a mutilated Security)
if the applicant for such payment shall furnish to the Company and the Trustee such security or indemnity as they may require to
save them harmless, and, in case of destruction, loss or theft, evidence to the satisfaction of the Company and the Trustee of
the destruction, loss or theft of such Security and of the ownership thereof.


 




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Every replacement Security
issued pursuant to the provisions of this Section shall constitute an additional contractual obligation of the Company whether
or not the mutilated, destroyed, lost or stolen Security shall be found at any time, or be enforceable by anyone, and shall be
entitled to all the benefits of this Indenture equally and proportionately with any and all other Securities of the same series
duly issued hereunder. All Securities shall be held and owned upon the express condition that the foregoing provisions are exclusive
with respect to the replacement or payment of mutilated, destroyed, lost or stolen Securities, and shall preclude (to the extent
lawful) any and all other rights or remedies, notwithstanding any law or statute existing or hereafter enacted to the contrary
with respect to the replacement or payment of negotiable instruments or other securities without their surrender.


 


Section 2.08         Cancellation.


 


All Securities surrendered
for the purpose of payment, redemption, repurchase, exchange, registration of transfer or conversion shall, if surrendered to the
Company or any paying agent (or any other applicable agent), be delivered to the Trustee for cancellation, or, if surrendered to
the Trustee, shall be cancelled by it, and no Securities shall be issued in lieu thereof except as expressly required or permitted
by any of the provisions of this Indenture. On request of the Company at the time of such surrender, the Trustee shall deliver
to the Company canceled Securities held by the Trustee. In the absence of such request the Trustee may dispose of canceled Securities
in accordance with its standard procedures and deliver a certificate of disposition to the Company. If the Company shall otherwise
acquire any of the Securities, however, such acquisition shall not operate as a redemption or satisfaction of the indebtedness
represented by such Securities unless and until the same are delivered to the Trustee for cancellation.


 


Section 2.09         Benefits
of Indenture.


 


Nothing in this Indenture
or in the Securities, express or implied, shall give or be construed to give to any Person, other than the parties hereto and the
holders of the Securities any legal or equitable right, remedy or claim under or in respect of this Indenture, or under any covenant,
condition or provision herein contained; all such covenants, conditions and provisions being for the sole benefit of the parties
hereto and of the holders of the Securities.


 


Section 2.10         Authenticating
Agent.


 


So long as any of the Securities
of any series remain Outstanding there may be an Authenticating Agent for any or all such series of Securities which the Trustee
shall have the right to appoint. Said Authenticating Agent shall be authorized to act on behalf of the Trustee to authenticate
Securities of such series issued upon exchange, transfer or partial redemption, repurchase or conversion thereof, 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. All references in this Indenture to the authentication of Securities by the Trustee shall be deemed to
include authentication by an Authenticating Agent for such series. Each Authenticating Agent shall be acceptable to the Company
and shall be a corporation that has a combined capital and surplus, as most recently reported or determined by it, sufficient under
the laws of any jurisdiction under which it is organized or in which it is doing business to conduct a trust business, and that
is otherwise authorized under such laws to conduct such business and is subject to supervision or examination by federal or state
authorities. If at any time any Authenticating Agent shall cease to be eligible in accordance with these provisions, it shall resign
immediately.


 




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Any Authenticating Agent
may at any time resign by giving written notice of resignation to the Trustee and to the Company. The Trustee may at any time (and
upon request by the Company shall) terminate the agency of any Authenticating Agent by giving written notice of termination to
such Authenticating Agent and to the Company. Upon resignation, termination or cessation of eligibility of any Authenticating Agent,
the Trustee may appoint an eligible successor Authenticating Agent acceptable to the Company. Any successor Authenticating Agent,
upon acceptance of its appointment hereunder, shall become vested with all the rights, powers and duties of its predecessor hereunder
as if originally named as an Authenticating Agent pursuant hereto.


 


Section 2.11         Global
Securities.


 


(a)          If
the Company shall establish pursuant to Section 2.01 that the Securities of a particular series are to be issued as a Global Security,
then the Company shall execute and the Trustee shall, in accordance with Section 2.04, authenticate and deliver, a Global Security
that (i) shall represent, and shall be denominated in an amount equal to the aggregate principal amount of, all of the Outstanding
Securities of such series, (ii) shall be registered in the name of the Depositary or its nominee, (iii) shall be delivered by the
Trustee to the Depositary or pursuant to the Depositary’s instruction (or if the Depositary names the Trustee as its custodian,
retained by the Trustee), and (iv) shall bear a legend substantially to the following effect: “Except as otherwise provided
in Section 2.11 of the Indenture, this Security may be transferred, in whole but not in part, only to another nominee of the Depositary
or to a successor Depositary or to a nominee of such successor Depositary.”


 


(b)          Notwithstanding
the provisions of Section 2.05, the Global Security of a series may be transferred, in whole but not in part and in the manner
provided in Section 2.05, only to another nominee of the Depositary for such series, or to a successor Depositary for such series
selected or approved by the Company or to a nominee of such successor Depositary.


 


(c)          If
at any time the Depositary for a series of the Securities notifies the Company that it is unwilling or unable to continue as Depositary
for such series or if at any time the Depositary for such series shall no longer be registered or in good standing under the Exchange
Act, or other applicable statute or regulation, and a successor Depositary for such series is not appointed by the Company within
90 days after the Company receives such notice or becomes aware of such condition, as the case may be, or if an Event of Default
has occurred and is continuing and the Company has received a request from the Depositary or from the Trustee, this Section 2.11
shall no longer be applicable to the Securities of such series and the Company will execute, and subject to Section 2.04, the Trustee
will authenticate and deliver the Securities of such series in definitive registered form without coupons, in authorized denominations,
and in an aggregate principal amount equal to the principal amount of the Global Security of such series in exchange for such Global
Security. In addition, the Company may at any time determine that the Securities of any series shall no longer be represented by
a Global Security and that the provisions of this Section 2.11 shall no longer apply to the Securities of such series. In such
event the Company will execute and, subject to Section 2.04, the Trustee, upon receipt of an Officer’s Certificate evidencing
such determination by the Company, will authenticate and deliver the Securities of such series in definitive registered form without
coupons, in authorized denominations, and in an aggregate principal amount equal to the principal amount of the Global Security
of such series in exchange for such Global Security. Upon the exchange of the Global Security for such Securities in definitive
registered form without coupons, in authorized denominations, the Global Security shall be canceled by the Trustee. Such Securities
in definitive registered form issued in exchange for the Global Security pursuant to this Section 2.11(c) shall be registered in
such names and in such authorized denominations as the Depositary, pursuant to instructions from its direct or indirect participants
or otherwise, shall instruct the Trustee. The Trustee shall deliver such Securities to the Depositary for delivery to the Persons
in whose names such Securities are so registered.


 




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Section 2.12         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 elements of identification 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.


 


article
3



REDEMPTION OF SECURITIES AND SINKING FUND PROVISIONS


 


Section 3.01         Redemption.


 


The Company may redeem
the Securities of any series issued hereunder on and after the dates and in accordance with the terms established for such series
pursuant to Section 2.01 hereof.


 


Section 3.02         Notice
of Redemption.


 


(a)          In
case the Company shall desire to exercise such right to redeem all or, as the case may be, a portion of the Securities of any series
in accordance with any right the Company reserved for itself to do so pursuant to Section 2.01 hereof, the Company shall,
or shall cause the Trustee to, give notice of such redemption to holders of the Securities of such series to be redeemed by mailing,
first class postage prepaid (or with regard to any Global Security held in book entry form, by electronic mail), a notice of such
redemption not less than 30 days and not more than 90 days before the date fixed for redemption of that series to such holders
at their last addresses as they shall appear upon the Security Register, unless a shorter period is specified in the Securities
to be redeemed. Any notice that is mailed in the manner herein provided shall be conclusively presumed to have been duly given,
whether or not the registered holder receives the notice. In any case, failure duly to give such notice to the holder of any Security
of any series designated for redemption in whole or in part, or any defect in the notice, shall not affect the validity of the
proceedings for the redemption of any other Securities of such series or any other series. 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 Officer’s Certificate evidencing compliance with any such restriction.


 




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Each such notice of redemption
shall identify the Securities to be redeemed (including CUSIP numbers, if any), specify the date fixed for redemption and the redemption
price at which Securities of that series are to be redeemed, and shall state that payment of the redemption price of such Securities
to be redeemed will be made at the office or agency of the Company, upon presentation and surrender of such Securities, that interest
accrued to the date fixed for redemption will be paid as specified in said notice, that from and after said date interest will
cease to accrue and that the redemption is from a sinking fund, if such is the case. If less than all the Securities of a series
are to be redeemed, the notice to the holders of Securities of that series to be redeemed in part shall specify the particular
Securities to be so redeemed.


 


In case any Security is
to be redeemed in part only, the notice that relates to such Security shall state the portion of the principal amount thereof to
be redeemed, and shall state that on and after the redemption date, upon surrender of such Security, a new Security or Securities
of such series in principal amount equal to the unredeemed portion thereof will be issued.


 


(b)          If
less than all the Securities of a series are to be redeemed, the Company shall give the Trustee at least 45 days’ notice
(unless a shorter notice shall be satisfactory to the Trustee) in advance of the date fixed for redemption as to the aggregate
principal amount of Securities of the series to be redeemed, and thereupon the Trustee shall select, by lot or in such other manner
as it shall deem appropriate and fair in its discretion and that may provide for the selection of a portion or portions (equal
to one thousand U.S. dollars ($1,000) or any integral multiple thereof) of the principal amount of such Securities of a denomination
larger than $1,000, the Securities to be redeemed and shall thereafter promptly notify the Company in writing of the numbers of
the Securities to be redeemed, in whole or in part. The Company may, if and whenever it shall so elect, by delivery of instructions
signed on its behalf by an Officer, instruct the Trustee or any paying agent to call all or any part of the Securities of a particular
series for redemption and to give notice of redemption in the manner set forth in this Section, such notice to be in the name of
the Company or its own name as the Trustee or such paying agent may deem advisable. In any case in which notice of redemption is
to be given by the Trustee or any such paying agent, the Company shall deliver or cause to be delivered to, or permit to remain
with, the Trustee or such paying agent, as the case may be, such Security Register, transfer books or other records, or suitable
copies or extracts therefrom, sufficient to enable the Trustee or such paying agent to give any notice by mail that may be required
under the provisions of this Section.


 




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Section 3.03         Payment
Upon Redemption.


 


(a)          If
the giving of notice of redemption shall have been completed as above provided, the Securities or portions of Securities of the
series to be redeemed specified in such notice shall become due and payable on the date and at the place stated in such notice
at the applicable redemption price, together with interest accrued to the date fixed for redemption and interest on such Securities
or portions of Securities shall cease to accrue on and after the date fixed for redemption, unless the Company shall default in
the payment of such redemption price and accrued interest with respect to any such Security or portion thereof. On presentation
and surrender of such Securities on or after the date fixed for redemption at the place of payment specified in the notice, said
Securities shall be paid and redeemed at the applicable redemption price for such series, together with interest accrued thereon
to the date fixed for redemption (but if the date fixed for redemption is an Interest Payment Date, the interest installment payable
on such date shall be payable to the registered holder at the close of business on the applicable record date pursuant to Section
2.03).


 


(b)          Upon
presentation of any Security of such series that is to be redeemed in part only, the Company shall execute and the Trustee shall
authenticate and the office or agency where the Security is presented shall deliver to the holder thereof, at the expense of the
Company, a new Security of the same series of authorized denominations in principal amount equal to the unredeemed portion of the
Security so presented.


 


Section 3.04         Sinking
Fund.


 


The provisions of Sections
3.04, 3.05 and 3.06 shall be applicable to any sinking fund for the retirement of Securities of a series, except as otherwise specified
as contemplated by Section 2.01 for Securities of such series.


 


The minimum amount of any
sinking fund payment provided for by the terms of 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 3.05. 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.


 


Section 3.05         Satisfaction
of Sinking Fund Payments with Securities.


 


The Company (i) may deliver
Outstanding Securities of a series and (ii) may apply as a credit Securities of a series that 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 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.


 




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Section 3.06         Redemption
of Securities for Sinking Fund.


 


Not less than 45 days prior
to each sinking fund payment date for any series of Securities (unless a shorter period shall be satisfactory to the Trustee),
the Company will deliver to the Trustee an Officer’s 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, that is to be satisfied by delivering and crediting
Securities of that series pursuant to Section 3.05 and the basis for such credit and will, together with such Officer’s Certificate,
deliver to the Trustee any Securities to be so delivered. Not less than 30 days before each such sinking fund payment date the
Trustee shall select the Securities to be redeemed upon such sinking fund payment date in the manner specified in Section 3.02
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 3.02. Such notice having been duly given, the redemption of such Securities shall be made upon the terms and in the
manner stated in Section 3.03.


 


article
4



COVENANTS


 


Section 4.01         Payment
of Principal, Premium and Interest.


 


The Company will duly and
punctually pay or cause to be paid the principal of (and premium, if any) and interest on the Securities of that series at the
time and place and in the manner provided herein and established with respect to such Securities. Payments of principal on the
Securities may be made at the time provided herein and established with respect to such Securities by U.S. dollar check drawn on
and mailed to the address of the Securityholder entitled thereto as such address shall appear in the Security Register, or U.S.
dollar wire transfer to, a U.S. dollar account if such Securityholder shall have furnished wire instructions to the Trustee no
later than 15 days prior to the relevant payment date. Payments of interest on the Securities may be made at the time provided
herein and established with respect to such Securities by U.S. dollar check mailed to the address of the Securityholder entitled
thereto as such address shall appear in the Security Register, or U.S. dollar wire transfer to, a U.S. dollar account if such Securityholder
shall have furnished wire instructions in writing to the Security Registrar and the Trustee no later than 15 days prior to the
relevant payment date.


 


Section 4.02         Maintenance
of Office or Agency.


 


So long as any series of
the Securities remain Outstanding, the Company agrees to maintain an office or agency with respect to each such series and at such
other location or locations as may be designated as provided in this Section 4.02, where (i) Securities of that series may be presented
for payment, (ii) Securities of that series may be presented as herein above authorized for registration of transfer and exchange,
and (iii) notices and demands to or upon the Company in respect of the Securities of that series and this Indenture may be given
or served, such designation to continue with respect to such office or agency until the Company shall, by written notice signed
by any officer authorized to sign an Officer’s Certificate and delivered to the Trustee, designate some other office or agency
for such purposes or any of them. 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, notices and demands may be made or served at the Corporate
Trust Office of the Trustee, and the Company hereby appoints the Trustee as its agent to receive all such presentations, notices
and demands. The Company initially appoints the Corporate Trust Office of the Trustee as its paying agent with respect to the Securities.


 




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Section 4.03         Paying
Agents.


 


(a)          If
the Company shall appoint one or more paying agents for all or any series of the Securities, other than the Trustee, the Company
will cause each such paying agent to execute and deliver to the Trustee an instrument in which such agent shall agree with the
Trustee, subject to the provisions of this Section:


 


(1)         that
it will hold all sums held by it as such agent for the payment of the principal of (and premium, if any) or interest on the Securities
of that series (whether such sums have been paid to it by the Company or by any other obligor of such Securities) in trust for
the benefit of the Persons entitled thereto;


 


(2)         that
it will give the Trustee notice of any failure by the Company (or by any other obligor of such Securities) to make any payment
of the principal of (and premium, if any) or interest on the Securities of that series when the same shall be due and payable;


 


(3)         that
it will, at any time during the continuance of any failure referred to in the preceding paragraph (a)(2) above, upon the written
request of the Trustee, forthwith pay to the Trustee all sums so held in trust by such paying agent; and


 


(4)         that
it will perform all other duties of paying agent as set forth in this Indenture.


 


(b)          If
the Company shall act as its own paying agent with respect to any series of the Securities, it will on or before each due date
of the principal of (and premium, if any) or interest on Securities of that series, set aside, segregate and hold in trust for
the benefit of the Persons entitled thereto a sum sufficient to pay such principal (and premium, if any) or interest so becoming
due on Securities of that series until such sums shall be paid to such Persons or otherwise disposed of as herein provided and
will promptly notify the Trustee of such action, or any failure (by it or any other obligor on such Securities) to take such action.
Whenever the Company shall have one or more paying agents for any series of Securities, it will, prior to each due date of the
principal of (and premium, if any) or interest on any Securities of that series, deposit with the 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 (unless such paying agent is the Trustee) the Company will promptly notify
the Trustee of this action or failure so to act.


 




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(c)          Notwithstanding
anything in this Section to the contrary, (i) the agreement to hold sums in trust as provided in this Section is subject to the
provisions of Section 11.05, and (ii) the Company may at any time, for the purpose of obtaining the satisfaction and discharge
of this Indenture or for any other purpose, pay, or direct any paying agent to pay, to the Trustee all sums held in trust by the
Company or such paying agent, such sums to be held by the Trustee upon the same terms and conditions as those upon which such sums
were held by the Company or such paying agent; and, upon such payment by the Company or any paying agent to the Trustee, the Company
or such paying agent shall be released from all further liability with respect to such money.


 


Section 4.04         Appointment
to Fill Vacancy in Office of Trustee.


 


The Company, whenever necessary
to avoid or fill a vacancy in the office of Trustee, will appoint, in the manner provided in Section 7.10, a Trustee, so that there
shall at all times be a Trustee hereunder.


 


article
5



SECURITYHOLDERS’ LISTS AND REPORTS BY THE COMPANY AND THE TRUSTEE


 


Section 5.01         Company
to Furnish Trustee Names and Addresses of Securityholders.


 


The Company will furnish
or cause to be furnished to the Trustee (a) within 15 days after each regular record date (as defined in Section 2.03) a list,
in such form as the Trustee may reasonably require, of the names and addresses of the holders of each series of Securities as of
such regular record date, provided that the Company shall not be obligated to furnish or cause to furnish such list at any time
that the list shall not differ in any respect from the most recent list furnished to the Trustee by the Company and (b) 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 and content as of a date not more than 15 days prior to the time such list is furnished; provided, however, that,
in either case, no such list need be furnished for any series for which the Trustee shall be the Security Registrar.


 


Section 5.02         Preservation
Of Information; Communications With Securityholders.


 


(a)          The
Trustee shall preserve, in as current a form as is reasonably practicable, all information as to the names and addresses of the
holders of Securities contained in the most recent list furnished to it as provided in Section 5.01 and as to the names and addresses
of holders of Securities received by the Trustee in its capacity as Security Registrar (if acting in such capacity).


 


(b)          The
Trustee may destroy any list furnished to it as provided in Section 5.01 upon receipt of a new list so furnished.


 




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(c)          Securityholders
may communicate as provided in Section 312(b) of the Trust Indenture Act with other Securityholders with respect to their rights
under this Indenture or under the Securities, and, in connection with any such communications, the Trustee shall satisfy its obligations
under Section 312(b) of the Trust Indenture Act in accordance with the provisions of Section 312(b) of the Trust Indenture Act.


 


Section 5.03         Reports
by the Company.


 


(a)          The
Company will at all times comply with Section 314(a) of the Trust Indenture Act. The Company covenants and agrees to provide (which
delivery may be via electronic mail) to the Trustee within 30 days, after the Company files 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) that the Company is required to file with the Commission
pursuant to Section 13 or Section 15(d) of the Exchange Act; provided, however, the Company shall not be required to deliver to
the Trustee any correspondence filed with the Commission or any materials for which the Company has sought and received confidential
treatment by the Commission; and provided further, that so long as such filings by the Company are available on the Commission’s
Electronic Data Gathering, Analysis and Retrieval System (EDGAR), or any successor system, such filings shall be deemed to have
been filed with the Trustee for purposes hereof without any further action required by the Company. For the avoidance of doubt,
a failure by the Company to file annual reports, information and other reports with the SEC within the time period prescribed thereof
by the Commission shall not be deemed a breach of this Section 5.03.


 


(b)          Delivery
of reports, information and documents to the Trustee under Section 5.03 is for informational purposes only and the information
and the Trustee’s receipt of the foregoing shall not constitute constructive notice of any information contained therein,
or determinable from information contained therein including the Company’s compliance with any of their covenants thereunder
(as to which the Trustee is entitled to rely exclusively on an Officer’s Certificate). The Trustee is under no duty to examine
any such reports, information or documents delivered to the Trustee or filed with the SEC via EDGAR to ensure compliance with the
provision of this Indenture or to ascertain the correctness or otherwise of the information or the statements contained therein.
The Trustee shall have no responsibility or duty whatsoever to ascertain or determine whether the above referenced filings with
the SEC on EDGAR (or any successor system) has occurred.


 


Section 5.04         Reports
by the Trustee.


 


(a)          If
required by Section 313(a) of the Trust Indenture Act, the Trustee, within sixty (60) days after each May 1, shall transmit by
mail, first class postage prepaid, to the Securityholders, as their names and addresses appear upon the Security Register, a brief
report dated as of such May 1, which complies with Section 313(a) of the Trust Indenture Act.


 


(b)          The
Trustee shall comply with Section 313(b) and 313(c) of the Trust Indenture Act.


 




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(c)          A
copy of each such report shall, at the time of such transmission to Securityholders, be filed by the Trustee with the Company,
with each securities exchange upon which any Securities are listed (if so listed) and also with the Commission. The Company agrees
to notify the Trustee when any Securities become listed on any securities exchange.


 


article
6



REMEDIES OF THE TRUSTEE AND SECURITYHOLDERS ON EVENT OF DEFAULT


 


Section 6.01         Events
of Default.


 


(a)          Whenever
used herein with respect to Securities of a particular series, “Event of Default” means any one or more of the following
events that has occurred and is continuing:


 


(1)         the
Company defaults in the payment of any installment of interest upon any of the Securities of that series, as and when the same
shall become due and payable, and such default continues for a period of 90 days; provided, however, that a valid extension of
an interest payment period by the Company in accordance with the terms of any indenture supplemental hereto shall not constitute
a default in the payment of interest for this purpose;


 


(2)         the
Company defaults in the payment of the principal of (or premium, if any, on) any of the Securities of that series as and when the
same shall become due and payable whether at maturity, upon redemption, by declaration or otherwise, or in any payment required
by any sinking or analogous fund established with respect to that series; provided, however, that a valid extension of the maturity
of such Securities in accordance with the terms of any indenture supplemental hereto shall not constitute a default in the payment
of principal or premium, if any;


 


(3)         the
Company fails to observe or perform any other of its covenants or agreements with respect to that series contained in this Indenture
or otherwise established with respect to that series of Securities pursuant to Section 2.01 hereof (other than a covenant or agreement
that has been expressly included in this Indenture solely for the benefit of one or more series of Securities other than such series)
for a period of 90 days after the date on which written notice of such failure, requiring the same to be remedied and stating that
such notice is a “Notice of Default” hereunder, shall have been given to the Company by the Trustee, by registered
or certified mail, or to the Company and the Trustee by the holders of at least 25% in principal amount of the Securities of that
series at the time Outstanding;


 


(4)         the
Company pursuant to or within the meaning of any Bankruptcy Law (i) commences a voluntary case, (ii) consents to the entry of an
order for relief against it in an involuntary case, (iii) consents to the appointment of a Custodian of it or for all or substantially
all of its property or (iv) makes a general assignment for the benefit of its creditors; or


 




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(5)         a
court of competent jurisdiction enters an order under any Bankruptcy Law that (i) is for relief against the Company in an involuntary
case, (ii) appoints a Custodian of the Company for all or substantially all of its property or (iii) orders the liquidation of
the Company, and the order or decree remains unstayed and in effect for 90 days.


 


(b)          In
each and every such case (other than an Event of Default specified in clause (4) or clause (5) above), unless the principal of
all the Securities of that series shall have already become due and payable, either the Trustee or the holders of not less than
25% in aggregate principal amount of the Securities of that series then Outstanding hereunder, by notice in writing to the Company
(and to the Trustee if given by such Securityholders), may declare the principal of (and premium, if any, on) and accrued and unpaid
interest on all the Securities of that series to be due and payable immediately, and upon any such declaration the same shall become
and shall be immediately due and payable. If an Event of Default specified in clause (4) or clause (5) above occurs, the principal
of and accrued and unpaid interest on all the Securities of that series shall automatically be immediately due and payable without
any declaration or other act on the part of the Trustee or the holders of the Securities.


 


(c)          At
any time after the principal of (and premium, if any, on) and accrued and unpaid interest on the Securities of that series shall
have been so declared due and payable, and before any judgment or decree for the payment of the moneys due shall have been obtained
or entered as hereinafter provided, the holders of a majority in aggregate principal amount of the Securities of that series then
Outstanding hereunder, 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 all matured installments of interest upon all
the Securities of that series and the principal of (and premium, if any, on) any and all Securities of that series that shall have
become due otherwise than by acceleration (with interest upon such principal and premium, if any, and, to the extent that such
payment is enforceable under applicable law, upon overdue installments of interest, at the rate per annum expressed in the Securities
of that series to the date of such payment or deposit) and the amount payable to the Trustee under Section 7.06, and (ii) any and
all Events of Default under the Indenture with respect to such series, other than the nonpayment of principal on (and premium,
if any, on) and accrued and unpaid interest on Securities of that series that shall not have become due by their terms, shall have
been remedied or waived as provided in Section 6.06.


 


No such rescission and
annulment shall extend to or shall affect any subsequent default or impair any right consequent thereon.


 


(d)          In
case the Trustee shall have proceeded to enforce any right with respect to Securities of that series under this Indenture and such
proceedings shall have been discontinued or abandoned because of such rescission or annulment or for any other reason or shall
have been determined adversely to the Trustee, then and in every such case, subject to any determination in such proceedings, the
Company and the Trustee shall be restored respectively to their former positions and rights hereunder, and all rights, remedies
and powers of the Company and the Trustee shall continue as though no such proceedings had been taken.


 




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Section 6.02         Collection
of Indebtedness and Suits for Enforcement by Trustee.


 


(a)          The
Company covenants that (i) in case it shall default in the payment of any installment of interest on any of the Securities
of a series, or in any payment required by any sinking or analogous fund established with respect to that series as and when the
same shall have become due and payable, and such default shall have continued for a period of 90 days, or (ii) in case it
shall default in the payment of the principal of (or premium, if any, on) any of the Securities of a series when the same shall
have become due and payable, whether upon maturity of the Securities of a series or upon redemption or upon declaration or otherwise
then, upon demand of the Trustee, the Company will pay to the Trustee, for the benefit of the holders of the Securities of that
series, the whole amount that then shall have been become due and payable on all such Securities for principal (and premium, if
any) or interest, or both, as the case may be, with interest upon the overdue principal (and premium, if any) and (to the extent
that payment of such interest is enforceable under applicable law) upon overdue installments of interest at the rate per annum
expressed in the Securities of that series; and, in addition thereto, such further amount as shall be sufficient to cover the costs
and expenses of collection, and the amount payable to the Trustee under Section 7.06.


 


(b)          If
the Company shall fail to pay such amounts forthwith upon such demand, the Trustee, in its own name and as trustee of an express
trust, shall be entitled and empowered to institute any action or proceedings at law or in equity for the collection of the sums
so due and unpaid, and may prosecute any such action or proceeding to judgment or final decree, and may enforce any such judgment
or final decree against the Company or other obligor upon the Securities of that series and collect the moneys adjudged or decreed
to be payable in the manner provided by law or equity out of the property of the Company or other obligor upon the Securities of
that series, wherever situated.


 


(c)          In
case of any receivership, insolvency, liquidation, bankruptcy, reorganization, readjustment, arrangement, composition or judicial
proceedings affecting the Company, or its creditors or property, the Trustee shall have power to intervene in such proceedings
and take any action therein that may be permitted by the court and shall (except as may be otherwise provided by law) be entitled
to file such proofs of claim and other papers and documents as may be necessary or advisable in order to have the claims of the
Trustee and of the holders of Securities of such series allowed for the entire amount due and payable by the Company under the
Indenture at the date of institution of such proceedings and for any additional amount that may become due and payable by the Company
after such date, and to collect and receive any moneys or other property payable or deliverable on any such claim, and to distribute
the same after the deduction of the amount payable to the Trustee under Section 7.06; and any receiver, assignee or trustee in
bankruptcy or reorganization is hereby authorized by each of the holders of Securities of such series to make such payments to
the Trustee, and, in the event that the Trustee shall consent to the making of such payments directly to such Securityholders,
to pay to the Trustee any amount due it under Section 7.06.


 


(d)          All
rights of action and of asserting claims under this Indenture, or under any of the terms established with respect to Securities
of that series, may be enforced by the Trustee without the possession of any of such Securities, or the production thereof at any
trial or other proceeding relative thereto, and any such suit or 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 payment to the Trustee of any amounts
due under Section 7.06, be for the ratable benefit of the holders of the Securities of such series.


 




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In case of an Event of
Default hereunder, the Trustee may in its discretion proceed to protect and enforce the rights vested in it by this Indenture by
such appropriate judicial proceedings as the Trustee shall deem most effectual to protect and enforce any of such rights, either
at law or in equity or in bankruptcy or otherwise, whether for the specific enforcement of any covenant or agreement contained
in the Indenture or in aid of the exercise of any power granted in this Indenture, or to enforce any other legal or equitable right
vested in the Trustee by this Indenture or by law.


 


Nothing contained herein
shall be deemed to authorize the Trustee to authorize or consent to or accept or adopt on behalf of any Securityholder any plan
of reorganization, arrangement, adjustment or composition affecting the Securities of that series or the rights of any holder thereof
or to authorize the Trustee to vote in respect of the claim of any Securityholder in any such proceeding.


 


Section 6.03         Application
of Moneys Collected.


 


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


 


FIRST: To the payment of
costs and expenses of collection and of all amounts payable to the Trustee under Section 7.06;


 


SECOND: To the payment
of the amounts then due and unpaid upon Securities of such series for principal (and premium, if any) and interest, 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; and


 


THIRD: To the payment of
the remainder, if any, to the Company or any other Person lawfully entitled thereto.


 


Section 6.04         Limitation
on Suits.


 


No holder of any Security
of any series shall have any right by virtue or by availing of any provision of this Indenture to institute any suit, action or
proceeding in equity or at law upon or under or with respect to this Indenture or for the appointment of a receiver or trustee,
or for any other remedy hereunder, unless (i) such holder previously shall have given to the Trustee written notice of an Event
of Default and of the continuance thereof with respect to the Securities of such series specifying such Event of Default, as hereinbefore
provided; (ii) the holders of not less than 25% in aggregate principal amount of the Securities of such series then Outstanding
shall have made written request upon the Trustee to institute such action, suit or proceeding in its own name as Trustee hereunder;
(iii) such holder or holders shall have offered to the Trustee indemnity satisfactory to it against the costs, expenses and liabilities
to be incurred in compliance with such request; (iv) the Trustee for 90 days after its receipt of such notice, request and offer
of indemnity, shall have failed to institute any such action, suit or proceeding and (v) during such 90 day period, the holders
of a majority in principal amount of the Securities of that series do not give the Trustee a direction inconsistent with the request.


 




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Notwithstanding anything
contained herein to the contrary or any other provisions of this Indenture, the right of any holder of any Security to receive
payment of the principal of (and premium, if any) and interest on such Security, as therein provided, on or after the respective
due dates expressed in such Security (or in the case of redemption, on the redemption date), or to institute suit for the enforcement
of any such payment on or after such respective dates or redemption date, shall not be impaired or affected without the consent
of such holder and by accepting a Security hereunder it is expressly understood, intended and covenanted by the taker and holder
of every Security of such series with every other such taker and holder and the Trustee, that no one or more holders of Securities
of such series shall have any right in any manner whatsoever by virtue or by availing of any provision of this Indenture to affect,
disturb or prejudice the rights of the holders of any other of such Securities, or to obtain or seek to obtain priority over or
preference to any other such holder, or to enforce any right under this Indenture, except in the manner herein provided and for
the equal, ratable and common benefit of all holders of Securities of such series. For the protection and enforcement of the provisions
of this Section, each and every Securityholder and the Trustee shall be entitled to such relief as can be given either at law or
in equity.


 


Section 6.05         Rights
and Remedies Cumulative; Delay or Omission Not Waiver.


 


(a)          Except
as otherwise provided in Section 2.07, all powers and remedies given by this Article to the Trustee or to the Securityholders shall,
to the extent permitted by law, be deemed cumulative and not exclusive of any other powers and remedies available to the Trustee
or the holders of the Securities, by judicial proceedings or otherwise, to enforce the performance or observance of the covenants
and agreements contained in this Indenture or otherwise established with respect to such Securities.


 


(b)          No
delay or omission of the Trustee or of any holder of any of the Securities to exercise any right or power accruing upon any Event
of Default occurring and continuing as aforesaid shall impair any such right or power, or shall be construed to be a waiver of
any such default or an acquiescence therein; and, subject to the provisions of Section 6.04, every power and remedy given by this
Article or by law to the Trustee or the Securityholders may be exercised from time to time, and as often as shall be deemed expedient,
by the Trustee or by the Securityholders.


 




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Section 6.06         Control
by Securityholders.


 


The holders of a majority
in aggregate principal amount of the Securities of any series at the time Outstanding, determined in accordance with Section 8.04,
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 such series; provided, however, that such direction shall
not be in conflict with any rule of law or with this Indenture or subject the Trustee in its sole discretion to personal liability.
Subject to the provisions of Section 7.01, the Trustee shall have the right to decline to follow any such direction if the Trustee
in good faith shall, by a Responsible Officer or officers of the Trustee, determine that the proceeding so directed, subject to
the Trustee’s duties under the Trust Indenture Act, would involve the Trustee in personal liability or might be unduly prejudicial
to the Securityholders not involved in the proceeding. The holders of a majority in aggregate principal amount of the Securities
of any series at the time Outstanding affected thereby, determined in accordance with Section 8.04, may on behalf of the holders
of all of the Securities of such series waive any past default in the performance of any of the covenants contained herein or established
pursuant to Section 2.01 with respect to such series and its consequences, except a default in the payment of the principal of,
or premium, if any, or interest on, any of the Securities of that series as and when the same shall become due by the terms of
such Securities otherwise than by acceleration (unless such default has been cured and a sum sufficient to pay all matured installments
of interest and principal and any premium has been deposited with the Trustee (in accordance with Section 6.01(c)). Upon any such
waiver, the default covered thereby shall be deemed to be cured for all purposes of this Indenture and the Company, the Trustee
and the holders of the Securities of such series shall be restored to their former positions and rights hereunder, respectively;
but no such waiver shall extend to any subsequent or other default or impair any right consequent thereon.


 


Section 6.07         Undertaking
to Pay Costs.


 


All parties to this Indenture
agree, and each holder of any Securities by such holder’s 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 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 any Securityholder, or group of Securityholders, holding more than 10% in aggregate principal amount of the Outstanding
Securities of any series, or to any suit instituted by any Securityholder for the enforcement of the payment of the principal of
(or premium, if any) or interest on any Security of such series, on or after the respective due dates expressed in such Security
or established pursuant to this Indenture.


 




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article
7



CONCERNING THE TRUSTEE


 


Section 7.01         Certain
Duties and Responsibilities of Trustee.


 


(a)          The
Trustee, prior to the occurrence of an Event of Default with respect to the Securities of a series and after the curing of all
Events of Default with respect to the Securities of that series that may have occurred, shall undertake to perform with respect
to the Securities of such series such duties and only such duties as are specifically set forth in this Indenture, and no implied
covenants shall be read into this Indenture against the Trustee. In case an Event of Default with respect to the Securities of
a series has occurred (that has not been cured or waived), the Trustee shall exercise with respect to Securities of that 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 or her own affairs.


 


(b)          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)          prior
to the occurrence of an Event of Default with respect to the Securities of a series and after the curing or waiving of all such
Events of Default with respect to that series that may have occurred:


 


(A)         the
duties and obligations of the Trustee shall with respect to the Securities of such series be determined solely by the express provisions
of this Indenture, and the Trustee shall not be liable with respect to the Securities of such series except for the performance
of such duties and obligations as are specifically set forth in this Indenture, and no implied covenants or obligations shall be
read into this Indenture against the Trustee; and


 


(B)         in
the absence of bad faith on the part of the Trustee, the Trustee may with respect to the Securities of such series conclusively
rely, as to the truth of the statements and the correctness of the opinions expressed therein, upon any 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
that by any provision 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 they conform to the requirements of this Indenture;


 


(ii)         the
Trustee shall not be liable to any Securityholder or to any other Person for any error of judgment made in good faith by a Responsible
Officer or Responsible Officers of the Trustee, 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 not less than a majority in principal amount of the Securities of any series at the time Outstanding
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 that series;


 


(iv)        none
of the provisions contained in this Indenture shall require the Trustee to expend or risk its own funds or otherwise incur personal
financial liability in the performance of any of its duties or in the exercise of any of its rights or powers if there is reasonable
ground for believing that the repayment of such funds or liability is not reasonably assured to it under the terms of this Indenture
or adequate indemnity against such risk is not reasonably assured to it;


 




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(v)         The
Trustee shall not be required to give any bond or surety in respect of the performance of its powers or duties hereunder;


 


(vi)        The
permissive right of the Trustee to do things enumerated in this Indenture shall not be construed as a duty of the Trustee; and


 


(vii)       No
Trustee shall have any duty or responsibility for any act or omission of any other Trustee appointed with respect to a series of
Securities hereunder.


 


Section 7.02         Certain
Rights of Trustee.


 


Except as otherwise provided
in Section 7.01:


 


(a)          The
Trustee may conclusively rely and shall be protected in acting or refraining from acting upon any resolution, certificate, statement,
instrument, opinion, report, notice, request, consent, order, approval, bond, security or other paper or document believed by it
to be genuine and to have been signed or presented by the proper party or parties;


 


(b)          Any
request, direction, order or demand of the Company mentioned herein shall be sufficiently evidenced by a Board Resolution or an
instrument signed in the name of the Company by any authorized officer of the Company (unless other evidence in respect thereof
is specifically prescribed herein);


 


(c)          The
Trustee may consult with counsel and the opinion or written advice of such counsel or, if requested, any Opinion of Counsel shall
be full and complete authorization and protection in respect of any action taken or suffered or omitted hereunder in good faith
and in reliance thereon;


 


(d)          The
Trustee shall be under no obligation to exercise any of the rights or powers vested in it by this Indenture at the request, order
or direction of any of the Securityholders pursuant to the provisions of this Indenture, unless such Securityholders shall have
offered to the Trustee security or indemnity reasonably acceptable to the Trustee against the costs, expenses and liabilities that
may be incurred therein or thereby; nothing contained herein shall, however, relieve the Trustee of the obligation, upon the occurrence
of an Event of Default with respect to a series of the Securities (that has not been cured or waived), to exercise with respect
to Securities of that series such of the rights and powers vested in it by this Indenture, and to 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 or her own affairs;


 


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


 




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(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, consent, order, approval, bond, security, or other papers or documents or inquire
as to the performance by the Company of one of its covenants under this Indenture, unless requested in writing so to do by the
holders of not less than a majority in principal amount of the Outstanding Securities of the particular series affected thereby
(determined as provided in Section 8.04); provided, however, that if the payment within a reasonable time to the Trustee of the
costs, expenses or liabilities likely to be incurred by it in the making of such investigation is, in the opinion of the Trustee,
not reasonably assured to the Trustee by the security afforded to it by the terms of this Indenture, the Trustee may require security
or indemnity reasonably acceptable to the Trustee against such costs, expenses or liabilities as a condition to so proceeding.
The reasonable expense of every such examination shall be paid by the Company or, if paid by the Trustee, shall be repaid by the
Company upon demand;


 


(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;


 


(h)          In
no event shall the Trustee be responsible or liable for any failure or delay in the performance of its obligations hereunder arising
out of or caused by, directly or indirectly, forces beyond its control, including, without limitation, strikes, work stoppages,
accidents, acts of war or terrorism, civil or military disturbances, nuclear or natural catastrophes or acts of God, and interruptions,
loss or malfunctions of utilities, communications or computer (software and hardware) services; it being understood that the Trustee
shall use reasonable efforts which are consistent with accepted practices in the banking industry to resume performance as soon
as practicable under the circumstances;


 


(i)          In
no event shall the Trustee be responsible or liable for special, indirect, punitive or consequential loss or damage of any kind
whatsoever (including, but not limited to, loss of profit) irrespective of whether the Trustee has been advised of the likelihood
of such loss or damage and regardless of the form of action; and


 


(j)          The
Trustee agrees to accept and act upon instructions or directions pursuant to this Indenture sent by unsecured e-mail, facsimile
transmission or other similar unsecured electronic methods; provided, however, that (a) the party providing such written instructions,
subsequent to such transmission of written instructions, shall provide the originally executed instructions or directions to the
Trustee in a timely manner, and (b) such originally executed instructions or directions shall be signed by an authorized representative
of the party providing such instructions or directions. If the party elects to give the Trustee e-mail or facsimile instructions
(or instructions by a similar electronic method) and the Trustee in its discretion elects to act upon such instructions, the Trustee’s
understanding of such instructions shall be deemed controlling. The Trustee shall not be liable for any losses, costs or expenses
arising directly or indirectly from the Trustee’s reliance upon and compliance with such instructions notwithstanding such
instructions conflict or are inconsistent with a subsequent written instruction. The party providing electronic instructions agrees
to assume all risks arising out of the use of such electronic methods to submit instructions and directions to the Trustee, including
without limitation the risk of the Trustee acting on unauthorized instructions, and the risk or interception and misuse by third
parties. The Trustee may request that the Company deliver an Officer’s Certificate setting forth the names of individuals
and/or titles of officers authorized at such time to furnish the Trustee with Officer’s Certificates, Company Orders and
any other matters or directions pursuant to this Indenture.


 




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(k)          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.


 


(l)          The
Trustee shall not be deemed to have knowledge of any Default or Event of Default (other than an Event of Default relating to the
failure to pay the interest on, or the principal of, the Securities) until the Trustee shall have received written notification
in the manner set forth in this Indenture or a Responsible Officer of the Trustee shall have obtained actual knowledge.


 


Section 7.03         Trustee
Not Responsible for Recitals or Issuance or Securities.


 


(a)          The
recitals contained herein and in the Securities shall be taken as the statements of the Company, and the Trustee assumes no responsibility
for the correctness of the same. The Trustee shall not be responsible for any statement in any registration statement, prospectus,
or any other document in connection with the sale of Securities. The Trustee shall not be responsible for any rating on the Securities
or any action or omission of any rating agency.


 


(b)          The
Trustee makes no representations as to the validity or sufficiency of this Indenture or of the Securities.


 


(c)          The
Trustee shall not be accountable for the use or application by the Company of any of the Securities or of the proceeds of such
Securities, or for the use or application of any moneys paid over by the Trustee in accordance with any provision of this Indenture
or established pursuant to Section 2.01, or for the use or application of any moneys received by any paying agent other than the
Trustee.


 


Section 7.04         May
Hold Securities.


 


The Trustee or any paying
agent or Security Registrar, in its individual or any other capacity, may become the owner or pledgee of Securities with the same
rights it would have if it were not Trustee, paying agent or Security Registrar.


 


Section 7.05         Moneys
Held in Trust.


 


Subject to the provisions
of Section 11.05, all moneys received by the Trustee shall, until used or applied as herein provided, be held in trust for the
purposes for which they were received, but 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 moneys received by it hereunder except such as it may agree with the Company to
pay thereon.


 




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Section 7.06         Compensation
and Reimbursement.


 


(a)          
The Company shall pay to the Trustee for each of its capacities hereunder from time to time compensation for its services as the
Company and the Trustee shall from time to time agree upon in writing. The Trustee’s compensation shall not be limited by
any law on compensation of a trustee of an express trust. The Company shall reimburse the Trustee upon request for all reasonable
out-of-pocket expenses incurred by it. Such expenses shall include the reasonable compensation and expenses of the Trustee’s
agents and counsel.


 


(b)          The
Company shall indemnify each of the Trustee in each of its capacities hereunder against any loss, liability or expense (including
the cost of defending itself and including the reasonable compensation and expenses of the Trustee’s agents and counsel)
incurred by it except as set forth in Section 7.06(c) in the exercise or performance of its powers, rights or duties under this
Indenture as Trustee or Agent. The Trustee shall notify the Company promptly of any claim for which it may seek indemnity. The
Company shall defend the claim and the Trustee shall cooperate in the defense. The Trustee may have one separate counsel and the
Company shall pay the reasonable fees and expenses of such counsel. The Company need not pay for any settlement made without its
consent, which consent shall not be unreasonably withheld. This indemnification shall apply to officers, directors, employees,
shareholders and agents of the Trustee.


 


(c)          The
Company need not reimburse any expense or indemnify against any loss or liability incurred by the Trustee or by any officer, director,
employee, shareholder or agent of the Trustee through negligence or bad faith.


 


(d)          To
ensure the Company’s payment obligations in this Section, the Trustee shall have a lien prior to the Securities on all funds
or property held or collected by the Trustee, except that held in trust to pay principal of or interest on particular Securities.
When the Trustee incurs expenses or renders services in connection with an Event of Default specified in Section 6.01(4) or (5),
the expenses (including the reasonable fees and expenses of its counsel) and the compensation for services in connection therewith
are to constitute expenses of administration under any bankruptcy law. The provisions of this Section 7.06 shall survive the termination
of this Indenture and the resignation or removal of the Trustee.


 


Section 7.07         Reliance
on Officer’s Certificate.


 


Except as otherwise provided
in Section 7.01, whenever in the administration of the provisions of this Indenture the Trustee shall deem it reasonably necessary
or desirable that a matter be proved or established prior to taking or suffering or omitting to take any action hereunder, such
matter (unless other evidence in respect thereof be herein specifically prescribed) may, in the absence of negligence or bad faith
on the part of the Trustee, be deemed to be conclusively proved and established by an Officer’s Certificate delivered to
the Trustee and such certificate, in the absence of negligence or bad faith on the part of the Trustee, shall be full warrant to
the Trustee for any action taken, suffered or omitted to be taken by it under the provisions of this Indenture upon the faith thereof.


 


Section 7.08         Disqualification;
Conflicting Interests.


 


If the Trustee has or shall
acquire any “conflicting interest” within the meaning of Section 310(b) of the Trust Indenture Act, the Trustee and
the Company shall in all respects comply with the provisions of Section 310(b) of the Trust Indenture Act.


 




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Section 7.09         Corporate
Trustee Required; Eligibility.


 


There shall at all times
be a Trustee with respect to the Securities issued hereunder which shall at all times be a corporation organized and doing business
under the laws of the United States of America or any state or territory thereof or of the District of Columbia, or a corporation
or other Person permitted to act as trustee by the Commission, authorized under such laws to exercise corporate trust powers, having
a combined capital and surplus of at least fifty million U.S. dollars ($50,000,000), and subject to supervision or examination
by federal, state, territorial, or District of Columbia authority.


 


If such corporation or
other Person publishes reports of condition at least annually, pursuant to law or to the requirements of the aforesaid supervising
or examining authority, then for the purposes of this Section, the combined capital and surplus of such corporation or other Person
shall be deemed to be its combined capital and surplus as set forth in its most recent report of condition so published. The Company
may not, nor may any Person directly or indirectly controlling, controlled by, or under common control with the Company, serve
as Trustee. In case at any time the Trustee shall cease to be eligible in accordance with the provisions of this Section, the Trustee
shall resign immediately in the manner and with the effect specified in Section 7.10.


 


Section 7.10         Resignation
and Removal; Appointment of Successor.


 


(a)          The
Trustee or any successor hereafter appointed may at any time resign with respect to the Securities of one or more series by giving
written notice thereof to the Company and by transmitting notice of resignation by mail, first class postage prepaid, to the Securityholders
of such series, as their names and addresses appear upon the Security Register. Upon receiving such notice of resignation, the
Company shall promptly appoint a successor trustee with respect to Securities of such series by written instrument, in duplicate,
executed by order of the Board of Directors, one copy of which instrument shall be delivered to the resigning Trustee and one copy
to the successor trustee. If no successor trustee shall have been so appointed and have accepted appointment within 30 days after
the mailing of such notice of resignation, the resigning Trustee may petition any court of competent jurisdiction for the appointment
of a successor trustee with respect to Securities of such series, or any Securityholder of that series who has been a bona fide
holder of a Security or Securities for at least six months may on behalf of himself and all others similarly situated, petition
any such court for the appointment of a successor trustee. Such court may thereupon after such notice, if any, as it may deem proper
and prescribe, appoint a successor trustee.


 


(b)          In
case at any time any one of the following shall occur:


 


(i)          the
Trustee shall fail to comply with the provisions of Section 7.08 after written request therefor by the Company or by any Securityholder
who has been a bona fide holder of a Security or Securities for at least six months; or


 


(ii)         the
Trustee shall cease to be eligible in accordance with the provisions of Section 7.09 and shall fail to resign after written request
therefor by the Company or by any such Securityholder; or


 




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(iii)        the
Trustee shall become incapable of acting, or shall be adjudged a bankrupt or insolvent, or commence a voluntary bankruptcy proceeding,
or a receiver of the Trustee or of its property shall be appointed or consented to, 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,
the Company may remove the Trustee with respect to all Securities and appoint a successor trustee by written instrument, in duplicate,
executed by order of the Board of Directors, one copy of which instrument shall be delivered to the Trustee so removed and one
copy to the successor trustee, or any Securityholder who has been a bona fide holder of a Security or Securities for at least six
months may, on behalf of that holder and all others similarly situated, petition any court of competent jurisdiction for the removal
of the Trustee and the appointment of a successor trustee. Such court may thereupon after such notice, if any, as it may deem proper
and prescribe, remove the Trustee and appoint a successor trustee.


 


(c)          The
holders of a majority in aggregate principal amount of the Securities of any series at the time Outstanding may at any time remove
the Trustee with respect to such series by so notifying the Trustee and the Company and may appoint a successor Trustee for such
series with the consent of the Company.


 


(d)          Any
resignation or removal of the Trustee and appointment of a successor trustee with respect to the Securities of a series pursuant
to any of the provisions of this Section shall become effective upon acceptance of appointment by the successor trustee as provided
in Section 7.11.


 


(e)          Any
successor trustee appointed pursuant to this Section may be appointed with respect to the Securities of one or more series or all
of such series, and at any time there shall be only one Trustee with respect to the Securities of any particular series.


 


Section 7.11         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, 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.


 




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(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 provisions 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) 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 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.


 


(e)          Upon
acceptance of appointment by a successor trustee as provided in this Section, the Company shall transmit notice of the succession
of such trustee hereunder by mail, first class postage prepaid, to the Securityholders, as their names and addresses appear upon
the Security Register. If the Company fails to transmit such notice within ten days after acceptance of appointment by the successor
trustee, the successor trustee shall cause such notice to be transmitted at the expense of the Company.


 




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Section 7.12         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, including the administration of the trust created by this Indenture, shall be the successor of the
Trustee hereunder, provided that such corporation shall be qualified under the provisions of Section 7.08 and eligible under the
provisions of Section 7.09, without the execution or filing of any paper or any further act on the part of any of the parties hereto,
anything herein to the contrary notwithstanding. 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.


 


Section 7.13         Preferential
Collection of Claims Against the Company.


 


The Trustee shall comply
with Section 311(a) of the Trust Indenture Act, excluding any creditor relationship described in Section 311(b) of the Trust Indenture
Act. A Trustee who has resigned or been removed shall be subject to Section 311(a) of the Trust Indenture Act to the extent included
therein.


 


Section 7.14         Notice
of Default. 


 


If any Event of Default
occurs and is continuing and if such Event of Default is known to a Responsible Officer of the Trustee, the Trustee shall mail
to each Securityholder in the manner and to the extent provided in Section 313(c) of the Trust Indenture Act notice of the Event
of Default within the earlier of 90 days after it occurs and 30 days after it is known to a Responsible Officer of the Trustee
or written notice of it is received by the Trustee, unless such Event of Default has been cured; provided, however, that,
except in the case of a default in the payment of the principal of (or premium, if any) or interest on any Security, the Trustee
shall be protected in withholding such notice if and so long as the Responsible Officers of the Trustee in good faith determine
that the withholding of such notice is in the interest of the Securityholders.


 


article
8



CONCERNING THE SECURITYHOLDERS


 


Section 8.01         Evidence
of Action by Securityholders.


 


Whenever in this Indenture
it is provided that the holders of a majority or specified percentage in aggregate principal amount of the Securities of a particular
series may take any action (including the making of any demand or request, the giving of any notice, consent or waiver or the taking
of any other action), the fact that at the time of taking any such action the holders of such majority or specified percentage
of that series have joined therein may be evidenced by any instrument or any number of instruments of similar tenor executed by
such holders of Securities of that series in person or by agent or proxy appointed in writing.


 




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If the Company shall solicit
from the Securityholders of any series any request, demand, authorization, direction, notice, consent, waiver or other action,
the Company may, at its option, as evidenced by an Officer’s Certificate, fix in advance a record date for such series for
the determination of Securityholders entitled to give such request, demand, authorization, direction, notice, consent, waiver or
other action, but the Company shall have no obligation to do so. If such a record date is fixed, such request, demand, authorization,
direction, notice, consent, waiver or other action may be given before or after the record date, but only the Securityholders of
record at the close of business on the record date shall be deemed to be Securityholders for the purposes of determining whether
Securityholders of the requisite proportion of Outstanding Securities of that series have authorized or agreed or consented to
such request, demand, authorization, direction, notice, consent, waiver or other action, and for that purpose the Outstanding Securities
of that series shall be computed as of the record date; provided, however, that no such authorization, agreement or consent by
such Securityholders on the record date shall be deemed effective unless it shall become effective pursuant to the provisions of
this Indenture not later than six months after the record date.


 


Section 8.02         Proof
of Execution by Securityholders.


 


Subject to the provisions
of Section 7.01, proof of the execution of any instrument by a Securityholder (such proof will not require notarization) or his
or her agent or proxy and proof of the holding by any Person of any of the Securities shall be sufficient if made in the following
manner:


 


(a)          The
fact and date of the execution by any such Person of any instrument may be proved in any reasonable manner acceptable to the Trustee.


 


(b)          The
ownership of Securities shall be proved by the Security Register of such Securities or by a certificate of the Security Registrar
thereof.


 


The Trustee may require such
additional proof of any matter referred to in this Section as it shall deem necessary.


 


Section 8.03         Who
May be Deemed Owners.


 


Prior to the due presentment
for registration of transfer of any Security, the Company, the Trustee, any paying agent and any Security Registrar may deem and
treat the Person in whose name such Security shall be registered upon the books of the Security Registrar as the absolute owner
of such Security (whether or not such Security shall be overdue and notwithstanding any notice of ownership or writing thereon
made by anyone other than the Security Registrar) for the purpose of receiving payment of or on account of the principal of, premium,
if any, and (subject to Section 2.03) interest on such Security and for all other purposes; and neither the Company nor the Trustee
nor any paying agent nor any Security Registrar shall be affected by any notice to the contrary.


 


Section 8.04         Certain
Securities Owned by Company Disregarded.


 


In determining whether
the holders of the requisite aggregate principal amount of Securities of a particular series have concurred in any direction, consent
or waiver under this Indenture, the Securities of that series that are owned by the Company or any other obligor on the Securities
of that series or by any Person directly or indirectly controlling or controlled by or under common control with the Company or
any other obligor on the Securities of that series shall be disregarded and deemed not to be Outstanding for the purpose of any
such determination, except that for the purpose of determining whether the Trustee shall be protected in relying on any such direction,
consent or waiver, only Securities of such series that the Trustee actually knows are so owned shall be so disregarded. The Securities
so owned that have been pledged in good faith may be regarded as Outstanding for the purposes of this Section, if the pledgee shall
establish to the satisfaction of the Trustee the pledgee’s right so to act with respect to such Securities and that the pledgee
is not a Person directly or indirectly controlling or controlled by or under direct or indirect common control with the Company
or any such other obligor. In case of a dispute as to such right, any decision by the Trustee taken upon the advice of counsel
shall be full protection to the Trustee.


 




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Section 8.05         Actions
Binding on Future Securityholders.


 


At any time prior to (but
not after) the evidencing to the Trustee, as provided in Section 8.01, of the taking of any action by the holders of the majority
or percentage in aggregate principal amount of the Securities of a particular series specified in this Indenture in connection
with such action, any holder of a Security of that series that is shown by the evidence to be included in the Securities the holders
of which have consented to such action may, by filing written notice with the Trustee, and upon proof of holding as provided in
Section 8.02, revoke such action so far as concerns such Security. Except as aforesaid any such action taken by the holder of any
Security shall be conclusive and binding upon such holder and upon all future holders and owners of such Security, and of any Security
issued in exchange therefor, on registration of transfer thereof or in place thereof, irrespective of whether or not any notation
in regard thereto is made upon such Security. Any action taken by the holders of the majority or percentage in aggregate principal
amount of the Securities of a particular series specified in this Indenture in connection with such action shall be conclusively
binding upon the Company, the Trustee and the holders of all the Securities of that series.


 


article
9



SUPPLEMENTAL INDENTURES


 


Section 9.01         Supplemental
Indentures Without the Consent of Securityholders.


 


In addition to any supplemental
indenture otherwise authorized by this Indenture, the Company and the Trustee may from time to time and at any time enter into
an indenture or indentures supplemental hereto (which shall conform to the provisions of the Trust Indenture Act as then in effect),
without the consent of the Securityholders, for one or more of the following purposes:


 


(a)          to
cure any ambiguity, defect, or inconsistency herein or in the Securities of any series;


 


(b)          to
comply with Article Ten;


 


(c)          to
provide for uncertificated Securities in addition to or in place of certificated Securities;


 




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(d)          to
add to the covenants, restrictions, conditions or provisions relating to the Company for the benefit of the holders of all or any
series of Securities (and if such covenants, restrictions, conditions or provisions are to be for the benefit of less than all
series of Securities, stating that such covenants, restrictions, conditions or provisions are expressly being included solely for
the benefit of such series), to make the occurrence, or the occurrence and the continuance, of a default in any such additional
covenants, restrictions, conditions or provisions an Event of Default, or to surrender any right or power herein conferred upon
the Company;


 


(e)          to
add to, delete from, or revise the conditions, limitations, and restrictions on the authorized amount, terms, or purposes of issue,
authentication, and delivery of Securities, as herein set forth;


 


(f)          to
make any change that does not adversely affect the rights of any Securityholder in any material respect;


 


(g)          to
provide for the issuance of and establish the form and terms and conditions of the Securities of any series as provided in Section
2.01, to establish the form of any certifications required to be furnished pursuant to the terms of this Indenture or any series
of Securities, or to add to the rights of the holders of any series of Securities;


 


(h)          to
evidence and provide for the acceptance of appointment hereunder by a successor trustee; or


 


(i)          to
comply with any requirements of the Commission or any successor in connection with the qualification of this Indenture under the
Trust Indenture Act.


 


The Trustee is hereby authorized
to join with the Company in the execution of any such supplemental indenture, and to make any further appropriate agreements and
stipulations that may be therein contained, but the Trustee shall not be obligated to enter into any such supplemental indenture
that affects the Trustee’s own rights, duties or immunities under this Indenture or otherwise.


 


Any supplemental indenture
authorized by the provisions of this Section may be executed by the Company and the Trustee without the consent of the holders
of any of the Securities at the time Outstanding, notwithstanding any of the provisions of Section 9.02.


 


Section 9.02         Supplemental
Indentures With Consent of Securityholders.


 


With the consent (evidenced
as provided in Section 8.01) of the holders of not less than a majority in aggregate principal amount of the Securities of each
series affected by such supplemental indenture or indentures at the time Outstanding, the Company, when authorized by a Board Resolution,
and the Trustee may from time to time and at any time enter into an indenture or indentures supplemental hereto (which shall conform
to the provisions of the Trust Indenture Act as then in effect) for the purpose of adding any provisions to or changing in any
manner or eliminating any of the provisions of this Indenture or of any supplemental indenture or of modifying in any manner not
covered by Section 9.01 the rights of the holders of the Securities of such series under this Indenture; provided, however, that
no such supplemental indenture shall, without the consent of the holders of each Security then Outstanding and affected thereby,
(a) extend the fixed maturity of any Securities of any series, or reduce the principal amount thereof, or reduce the rate or extend
the time of payment of interest thereon, or reduce any premium payable upon the redemption thereof or (b) reduce the aforesaid
percentage of Securities, the holders of which are required to consent to any such supplemental indenture.


 




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It shall not be necessary
for the consent of the Securityholders of any series affected thereby under this Section to approve the particular form of any
proposed supplemental indenture, but it shall be sufficient if such consent shall approve the substance thereof.


 


Section 9.03         Effect
of Supplemental Indentures.


 


Upon the execution of any
supplemental indenture pursuant to the provisions of this Article or of Section 10.01, this Indenture shall, with respect to such
series, be and be deemed to be modified and amended in accordance therewith and the respective rights, limitations of rights, obligations,
duties and immunities under this Indenture of the Trustee, the Company and the holders of Securities of the series affected thereby
shall thereafter be determined, exercised and enforced hereunder subject in all respects to such modifications and amendments,
and all the terms and conditions of any such supplemental indenture shall be and be deemed to be part of the terms and conditions
of this Indenture for any and all purposes.


 


Section 9.04         Securities
Affected by Supplemental Indentures.


 


Securities of any series
affected by a supplemental indenture, authenticated and delivered after the execution of such supplemental indenture pursuant to
the provisions of this Article or of Section 10.01, may bear a notation in form approved by the Company, provided such form meets
the requirements of any securities exchange upon which such series may be listed, as to any matter provided for in such supplemental
indenture. If the Company shall so determine, new Securities of that series so modified as to conform, in the opinion of the Board
of Directors, to any modification of this Indenture contained in any such supplemental indenture may be prepared by the Company,
authenticated by the Trustee and delivered in exchange for the Securities of that series then Outstanding.


 


Section 9.05         Execution
of Supplemental Indentures.


 


Upon the request of the
Company, accompanied by its Board Resolutions authorizing the execution of any such supplemental indenture, and upon the filing
with the Trustee of evidence of the consent of Securityholders required to consent thereto as aforesaid, the Trustee shall join
with the Company in the execution of such supplemental indenture unless such supplemental indenture affects the Trustee’s
own rights, duties or immunities under this Indenture or otherwise, in which case the Trustee may in its discretion but shall not
be obligated to enter into such supplemental indenture. The Trustee, subject to the provisions of Section 7.01, shall receive an
Officer’s Certificate or an Opinion of Counsel as conclusive evidence that any supplemental indenture executed pursuant to
this Article is authorized or permitted by the terms of this Article and that all conditions precedent to the execution of the
supplemental indenture have been complied with; provided, however, that such Officer’s Certificate or Opinion of Counsel
need not be provided in connection with the execution of a supplemental indenture that establishes the terms of a series of Securities
pursuant to Section 2.01 hereof.


 




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Promptly after the execution
by the Company and the Trustee of any supplemental indenture pursuant to the provisions of this Section, the Company shall (or
shall direct the Trustee to) transmit by mail, first class postage prepaid, a notice, setting forth in general terms the substance
of such supplemental indenture, to the Securityholders of all series affected thereby .as their names and addresses appear upon
the Security Register. Any failure of the Company to mail, or cause the mailing of, such notice, or any defect therein, shall not,
however, in any way impair or affect the validity of any such supplemental indenture.


 


article
10



SUCCESSOR ENTITY


 


Section 10.01         Company
May Consolidate, Etc.


 


Nothing contained in this
Indenture shall prevent any consolidation or merger of the Company with or into any other Person (whether or not affiliated with
the Company) or successive consolidations or mergers in which the Company or its successor or successors shall be a party or parties,
or shall prevent any sale, conveyance, transfer or other disposition of the property of the Company or its successor or successors
as an entirety, or substantially as an entirety, to any other Person (whether or not affiliated with the Company or its successor
or successors); provided, however, the Company hereby covenants and agrees that, upon any such consolidation or merger (in each
case, if the Company is not the survivor of such transaction) or any such sale, conveyance, transfer or other disposition (other
than a sale, conveyance, transfer or other disposition to a Subsidiary of the Company), the due and punctual payment of the principal
of (premium, if any) and interest on all of the Securities of all series in accordance with the terms of each series, according
to their tenor, and the due and punctual performance and observance of all the covenants and conditions of this Indenture with
respect to each series or established with respect to such series pursuant to Section 2.01 to be kept or performed by the Company
shall be expressly assumed, by supplemental indenture (which shall conform to the provisions of the Trust Indenture Act, as then
in effect) reasonably satisfactory in form to the Trustee executed and delivered to the Trustee by the entity formed by such consolidation,
or into which the Company shall have been merged, or by the entity which shall have acquired such property.


 


Section 10.02         Successor
Entity Substituted.


 


(a)          In
case of any such consolidation, merger, sale, conveyance, transfer or other disposition and upon the assumption by the successor
entity by supplemental indenture, executed and delivered to the Trustee and satisfactory in form to the Trustee, of the obligations
set forth under Section 10.01 on all of the Securities of all series Outstanding, such successor entity shall succeed to and be
substituted for the Company with the same effect as if it had been named as the Company herein, and thereupon the predecessor corporation
shall be relieved of all obligations and covenants under this Indenture and the Securities.


 




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(b)          In
case of any such consolidation, merger, sale, conveyance, transfer or other disposition, such changes in phraseology and form (but
not in substance) may be made in the Securities thereafter to be issued as may be appropriate.


 


(c)          Nothing
contained in this Article shall require any action by the Company in the case of a consolidation or merger of any Person into the
Company where the Company is the survivor of such transaction, or the acquisition by the Company, by purchase or otherwise, of
all or any part of the property of any other Person (whether or not affiliated with the Company).


 


article
11



SATISFACTION AND DISCHARGE


 


Section 11.01         Satisfaction
and Discharge of Indenture.


 


If at any time: (a) the
Company shall have delivered to the Trustee for cancellation all Securities of a series theretofore authenticated and not delivered
to the Trustee for cancellation (other than any Securities that shall have been destroyed, lost or stolen and that shall have been
replaced or paid as provided in Section 2.07 and Securities for whose payment money or Governmental Obligations have theretofore
been deposited in trust or segregated and held in trust by the Company and thereupon repaid to the Company or discharged from such
trust, as provided in Section 11.05); or (b) all such Securities of a particular series not theretofore delivered to the Trustee
for cancellation shall have become due and payable, or are by their terms to become due and payable within one year or are to be
called for redemption within one year under arrangements satisfactory to the Trustee for the giving of notice of redemption, and
the Company shall deposit or cause to be deposited with the Trustee as trust funds the entire amount in moneys or Governmental
Obligations or a combination thereof, sufficient in the opinion of a nationally recognized firm of independent public accountants
expressed in a written certification thereof delivered to the Trustee, to pay at maturity or upon redemption all Securities of
that series not theretofore delivered to the Trustee for cancellation, including principal (and premium, if any) and interest due
or to become due to such date of maturity or date fixed for redemption, as the case may be, and if the Company shall also pay or
cause to be paid all other sums payable hereunder with respect to such series by the Company then this Indenture shall thereupon
cease to be of further effect with respect to such series except for the provisions of Sections 2.03, 2.05, 2.07, 4.01, 4.02, 4.03
and 7.10, that shall survive until the date of maturity or redemption date, as the case may be, and Sections 7.06 and 11.05, that
shall survive to such date and thereafter, and the Trustee, on demand of the Company and at the cost and expense of the Company
shall execute proper instruments acknowledging satisfaction of and discharging this Indenture with respect to such series.


 




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Section 11.02         Discharge
of Obligations.


 


If at any time all such
Securities of a particular series not heretofore delivered to the Trustee for cancellation or that have not become due and payable
as described in Section 11.01 shall have been paid by the Company by depositing irrevocably with the Trustee as trust funds moneys
or an amount of Governmental Obligations sufficient to pay at maturity or upon redemption all such Securities of that series not
theretofore delivered to the Trustee for cancellation, including principal (and premium, if any) and interest due or to become
due to such date of maturity or date fixed for redemption, as the case may be, and if the Company shall also pay or cause to be
paid all other sums payable hereunder by the Company with respect to such series, then after the date such moneys or Governmental
Obligations, as the case may be, are deposited with the Trustee the obligations of the Company under this Indenture with respect
to such series shall cease to be of further effect except for the provisions of Sections 2.03, 2.05, 2.07, 4,01, 4.02, 4,03, 7.06,
7.10 and 11.05 hereof that shall survive until such Securities shall mature and be paid.


 


Thereafter, Sections 7.06
and 11.05 shall survive.


 


Section 11.03         Deposited
Moneys to be Held in Trust.


 


All moneys or Governmental
Obligations deposited with the Trustee pursuant to Sections 11.01 or 11.02 shall be held in trust and shall be available for payment
as due, either directly or through any paying agent (including the Company acting as its own paying agent), to the holders of the
particular series of Securities for the payment or redemption of which such moneys or Governmental Obligations have been deposited
with the Trustee.


 


Section 11.04         Payment
of Moneys Held by Paying Agents.


 


In connection with the
satisfaction and discharge of this Indenture all moneys or Governmental Obligations then held by any paying agent under the provisions
of this Indenture shall, upon demand of the Company, be paid to the Trustee and thereupon such paying agent shall be released from
all further liability with respect to such moneys or Governmental Obligations.


 


Section 11.05         Repayment
to Company.


 


Any moneys or Governmental
Obligations deposited with any paying agent or the Trustee, or then held by the Company, in trust for payment of principal of or
premium, if any, or interest on the Securities of a particular series that are not applied but remain unclaimed by the holders
of such Securities for at least two years after the date upon which the principal of (and premium, if any) or interest on such
Securities shall have respectively become due and payable, or such other shorter period set forth in applicable escheat or abandoned
or unclaimed property law, shall be repaid to the Company on May 31 of each year or upon the Company’s request or (if then
held by the Company) shall be discharged from such trust; and thereupon the paying agent and the Trustee shall be released from
all further liability with respect to such moneys or Governmental Obligations, and the holder of any of the Securities entitled
to receive such payment shall thereafter, as a general creditor, look only to the Company for the payment thereof.


 


article
12



IMMUNITY OF INCORPORATORS, STOCKHOLDERS, OFFICERS AND DIRECTORS


 


Section 12.01         No
Recourse.


 


No recourse under or upon
any obligation, covenant or agreement of this Indenture, or of any Security, or for any claim based thereon or otherwise in respect
thereof, shall be had against any incorporator, stockholder, officer or director, past, present or future as such, of the Company
or of any predecessor or successor corporation, either directly or through the Company or any such predecessor or successor corporation,
whether by virtue of any constitution, statute or rule of law, or by the enforcement of any assessment or penalty or otherwise;
it being expressly understood that this Indenture and the obligations issued hereunder are solely corporate obligations, and that
no such personal liability whatever shall attach to, or is or shall be incurred by, the incorporators, stockholders, officers or
directors as such, of the Company or of any predecessor or successor corporation, or any of them, because of the creation of the
indebtedness hereby authorized, or under or by reason of the obligations, covenants or agreements contained in this Indenture or
in any of the Securities or implied therefrom; and that any and all such personal liability of every name and nature, either at
common law or in equity or by constitution or statute, of, and any and all such rights and claims against, every such incorporator,
stockholder, officer or director as such, because of the creation of the indebtedness hereby authorized, or under or by reason
of the obligations, covenants or agreements contained in this Indenture or in any of the Securities or implied therefrom, are hereby
expressly waived and released as a condition of, and as a consideration for, the execution of this Indenture and the issuance of
such Securities.


 




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article
13



MISCELLANEOUS PROVISIONS


 


Section 13.01         Effect
on Successors and Assigns.


 


All the covenants, stipulations,
promises and agreements in this Indenture made by or on behalf of the Company shall bind its successors and assigns, whether so
expressed or not.


 


Section 13.02         Actions
by Successor.


 


Any act or proceeding by
any provision of this Indenture authorized or required to be done or performed by any board, committee or officer of the Company
shall and may be done and performed with like force and effect by the corresponding board, committee or officer of any corporation
that shall at the time be the lawful successor of the Company.


 


Section 13.03         Surrender
of Company Powers.


 


The Company by instrument
in writing executed by authority of its Board of Directors and delivered to the Trustee may surrender any of the powers reserved
to the Company, and thereupon such power so surrendered shall terminate both as to the Company and as to any successor corporation.


 




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Section 13.04         Notices.


 


Except as otherwise expressly
provided herein, any notice, request or demand that by any provision of this Indenture is required or permitted to be given, made
or served by the Trustee, the Security Registrar, any paying or other agent under this Indenture or by the holders of Securities
or by any other Person pursuant to this Indenture to or on the Company may be given or served by being deposited in first class
mail, postage prepaid, addressed (until another address is filed in writing by the Company with the Trustee), as follows: Threshold
Pharmaceuticals, Inc., 170 Harbor Way, South San Francisco, California 94080, Attention: Joel Fernandes. Any notice, election,
request or demand by the Company or any Securityholder or by any other Person pursuant to this Indenture to or upon the Trustee
shall be deemed to have been sufficiently given or made, for all purposes, if given or made in writing at the Corporate Trust Office
of the Trustee.


 


Section 13.05         Governing
Law; Jury Trial Waiver.


 


This Indenture and each
Security shall be deemed to be a contract made under the internal laws of the State of New York, and for all purposes shall be
construed in accordance with the laws of said State, except to the extent that the Trust Indenture Act is applicable.


 


EACH PARTY HERETO, AND
EACH HOLDER OF A SECURITY BY ACCEPTANCE THEREOF, HEREBY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY RIGHT IT
MAY HAVE TO A TRIAL BY JURY IN RESPECT OF ANY LITIGATION DIRECTLY OR INDIRECTLY ARISING OUT OF, UNDER OR IN CONNECTION WITH THIS
INDENTURE.


 


Section 13.06         Treatment
of Securities as Debt.


 


It is intended that the
Securities will be treated as indebtedness and not as equity for federal income tax purposes. The provisions of this Indenture
shall be interpreted to further this intention.


 


Section 13.07         Certificates
and Opinions as to Conditions Precedent.


 


(a)          Upon
any application or demand by the Company to the Trustee to take any action under any of the provisions of this Indenture, the Company
shall furnish to the Trustee an Officer’s Certificate stating that all conditions precedent provided for in this Indenture
(other than the certificate to be delivered pursuant to Section 13.12) relating to the proposed action have been complied with
and, if requested, an Opinion of Counsel stating that in the opinion of such counsel all such conditions precedent have been complied
with, except that in the case of any such application or demand as to which the furnishing of such documents is specifically required
by any provision of this Indenture relating to such particular application or demand, no additional certificate or opinion need
be furnished.


 




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(b)          Each
certificate or opinion provided for in this Indenture and delivered to the Trustee with respect to compliance with a condition
or covenant in this Indenture (other than the certificate to be delivered pursuant to Section 13.12 or Section 314(a)(1) of the
Trust Indenture Act) shall include (i) a statement that the Person making such certificate or opinion has read such covenant or
condition; (ii) a brief statement as to the nature and scope of the examination or investigation upon which the statements or opinions
contained in such certificate or opinion are based; (iii) a statement that, in the opinion of such Person, he has made such examination
or investigation as is reasonably necessary to enable him to express an informed opinion as to whether or not such covenant or
condition has been complied with; and (iv) a statement as to whether or not, in the opinion of such Person, such condition or covenant
has been complied with.


 


Section 13.08         Payments
on Business Days.


 


Except as provided pursuant
to Section 2.01 pursuant to a Board Resolution, and set forth in an Officer’s Certificate, or established in one or more
indentures supplemental to this Indenture, in any case where the date of maturity of interest or principal of any Security or the
date of redemption of any Security shall not be a Business Day, then payment of interest or principal (and premium, if any) may
be made on the next succeeding Business Day with the same force and effect as if made on the nominal date of maturity or redemption,
and no interest shall accrue for the period after such nominal date.


 


Section 13.09         Conflict
with Trust Indenture Act.


 


If and to the extent that
any provision of this Indenture limits, qualifies or conflicts with the duties imposed by Section 318(c) of the Trust Indenture
Act, such imposed duties shall control.


 


Section 13.10         Counterparts.


 


This Indenture may be executed
in any number of counterparts, each of which shall be an original, but such counterparts shall together constitute but one and
the same instrument. The exchange of copies of this Indenture and of signature pages by facsimile or PDF transmission shall constitute
effective execution and delivery of this Indenture as to the parties hereto and may be used in lieu of the original Indenture for
all purposes. Signatures of the parties hereto transmitted by facsimile or PDF shall be deemed to be their original signatures
for all purposes.


 


Section 13.11         Separability.


 


In case any one or more
of the provisions contained in this Indenture or in the Securities of any series shall for any reason be held to be invalid, illegal
or unenforceable in any respect, such invalidity, illegality or unenforceability shall not affect any other provisions of this
Indenture or of such Securities, but this Indenture and such Securities shall be construed as if such invalid or illegal or unenforceable
provision had never been contained herein or therein.


 




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Section 13.12         Compliance
Certificates.


 


The Company shall deliver
to the Trustee, within 120 days after the end of each fiscal year during which any Securities of any series were outstanding, an
officer’s certificate stating whether or not the signers know of any Event of Default that occurred during such fiscal year.
Such certificate shall contain a certification from the principal executive officer, principal financial officer or principal accounting
officer of the Company that a review has been conducted of the activities of the Company and the Company’s performance under
this Indenture and that the Company has complied with all conditions and covenants under this Indenture. For purposes of this Section
13.12, such compliance shall be determined without regard to any period of grace or requirement of notice provided under this Indenture.
If the officer of the Company signing such certificate has knowledge of such an Event of Default, the certificate shall describe
any such Event of Default and its status.


 


Section 13.13         U.S.A.
Patriot Act.


 


The parties hereto acknowledge
that in accordance with Section 326 of the U.S.A. Patriot Act, the Trustee, like all financial institutions and in order to help
fight the funding of terrorism and money laundering, is required to obtain, verify, and record information that identifies each
person or legal entity that establishes a relationship or opens an account with the Trustee. The parties to this Indenture agree
that they will provide the Trustee with such information as it may request in order for the Trustee to satisfy the requirements
of the U.S.A. Patriot Act.


 


Section 13.14         Force
Majeure.


 


In no event shall the Trustee,
the Security Registrar, any paying agent or any other agent under this Indenture be responsible or liable for any failure or delay
in the performance of its obligations hereunder arising out of or caused by, directly or indirectly, forces beyond its control,
including without limitation, strikes, work stoppages, accidents, acts of war or terrorism, civil or military disturbances, nuclear
or natural catastrophes or acts of God, and interruptions, loss or malfunctions or utilities, communications or computer (software
and hardware) services; it being understood that the Trustee, the Security Registrar, any paying agent or any other agent under
this Indenture shall use reasonable efforts which are consistent with accepted practices in the banking industry to resume performance
as soon as practicable under the circumstances.


 


Section 13.15         Table
of Contents; Headings.


 


The table of contents and
headings of the articles and sections of this Indenture have been inserted for convenience of reference only, are not intended
to be considered a part hereof, and will not modify or restrict any of the terms or provisions hereof.


 




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In
Witness Whereof, the parties hereto have caused this Indenture to be duly executed all as of the day and year first
above written.


 


	 	Threshold Pharmaceuticals, Inc.
	 	 	 
	 	By:	 
	 	 	 
	 	Name:	 
	 	 	 
	 	Title:	 
	 	 	 
	 	[Trustee], as Trustee
	 	 	 
	 	By:	 
	 	 	 
	 	Name:	 
	 	 	 
	 	Title:	 


 




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CROSS-REFERENCE TABLE
(1)


 


	Section of Trust Indenture Act of 1939, as Amended	 	Section of Indenture
	310(a)	 	7.09
	310(b)	 	7.08
	 	 	7.10
	310(c)	 	Inapplicable
	311(a)	 	7.13
	311(b)	 	7.13
	311(c)	 	Inapplicable
	312(a)	 	5.01
	 	 	5.02(a)
	312(b)	 	5.02(c)
	312(c)	 	5.02(c)
	313(a)	 	5.04(a)
	313(b)	 	5.04(b)
	313(c)	 	5.04(a)
	 	 	5.04(b)
	313(d)	 	5.04(c)
	314(a)	 	5.03
	 	 	13.12
	314(b)	 	Inapplicable
	314(c)	 	13.07(a)
	314(d)	 	Inapplicable
	314(e)	 	13.07(b)
	314(f)	 	Inapplicable
	315(a)	 	7.01(a)
	 	 	7.01(b)
	315(b)	 	7.14
	315(c)	 	7.01
	315(d)	 	7.01(b)
	315(e)	 	6.07
	316(a)	 	6.06
	 	 	8.04
	316(b)	 	6.04
	316(c)	 	8.01
	317(a)	 	6.02
	317(b)	 	4.03
	318(a)	 	13.09


 


 






(1)         This
Cross-Reference Table does not constitute part of the Indenture and shall not have any bearing on the interpretation of any of
its terms or provisions.


 




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