Document:

Indenture, dated September 15, 2008

 Exhibit 4.1 
 CELL THERAPEUTICS, INC., 
 as Company 
 U.S. BANK NATIONAL ASSOCIATION, 
 as Trustee 
 INDENTURE 
 Dated as of
September 15, 2008 
 10% CONVERTIBLE SENIOR NOTES DUE 2012 

 TABLE OF CONTENTS 
  

			
	 	  	Page
	 ARTICLE I DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION
	  	1
	 SECTION 1.1 Definitions
	  	1
	 SECTION 1.2 Compliance Certificates and Opinions
	  	13
	 SECTION 1.3 Form of Documents Delivered to the Trustee
	  	14
	 SECTION 1.4 Acts of Holders of Securities
	  	14
	 SECTION 1.5 Notices, Etc., to Trustee and Company
	  	16
	 SECTION 1.6 Notice to Holders of Securities; Waiver
	  	17
	 SECTION 1.7 Effect of Headings and Table of Contents
	  	17
	 SECTION 1.8 Successors and Assigns
	  	17
	 SECTION 1.9 Separability Clause
	  	17
	 SECTION 1.10 Benefits of Indenture
	  	17
	 SECTION 1.11 Governing Law
	  	18
	 SECTION 1.12 Legal Holidays
	  	18
	 SECTION 1.13 Conflict with Trust Indenture Act
	  	18
	 SECTION 1.14 Counterparts
	  	18
		
	 ARTICLE II THE SECURITIES
	  	18
	 SECTION 2.1 Form Generally
	  	18
	 SECTION 2.2 Title and Terms
	  	19
	 SECTION 2.3 Denominations
	  	20
	 SECTION 2.4 Execution, Authentication, Delivery and Dating
	  	20
	 SECTION 2.5 Global Securities
	  	20
	 SECTION 2.6 Registration, Registration of Transfer and Exchange
	  	21
	 SECTION 2.7 Mutilated, Destroyed, Lost or Stolen Securities
	  	22
	 SECTION 2.8 Payment of Interest; Interest Rights Preserved
	  	23
	 SECTION 2.9 Persons Deemed Owners
	  	24
	 SECTION 2.10 Cancellation
	  	24
	 SECTION 2.11 Computation of Interest
	  	25
	 SECTION 2.12 CUSIP Numbers
	  	25
		
	 ARTICLE III SATISFACTION AND DISCHARGE
	  	25
	 SECTION 3.1 Satisfaction and Discharge of Indenture
	  	25
	 SECTION 3.2 Application of Trust Money
	  	26
		
	 ARTICLE IV REMEDIES
	  	26
	 SECTION 4.1 Events of Default
	  	26
	 SECTION 4.2 Acceleration of Maturity; Rescission and Annulment
	  	28
	 SECTION 4.3 Collection of Indebtedness and Suits for Enforcement by Trustee
	  	29
	 SECTION 4.4 Trustee May File Proofs of Claim
	  	29
	 SECTION 4.5 Trustee May Enforce Claims without Possession of Securities
	  	30
	 SECTION 4.6 Application of Money Collected
	  	30

  

 i 

			
	 SECTION 4.7 Limitation on Suits
	  	31
	 SECTION 4.8 Unconditional Right of Holders to Receive Principal, Premium and Interest and to Convert
	  	31
	 SECTION 4.9 Restoration of Rights and Remedies
	  	31
	 SECTION 4.10 Rights and Remedies Cumulative
	  	32
	 SECTION 4.11 Delay or Omission Not Waiver
	  	32
	 SECTION 4.12 Control by Holders of Securities
	  	32
	 SECTION 4.13 Waiver of Past Defaults
	  	32
	 SECTION 4.14 Undertaking for Costs
	  	33
	 SECTION 4.15 Waiver of Stay, Usury or Extension Laws
	  	33
		
	 ARTICLE V THE TRUSTEE
	  	33
	 SECTION 5.1 Certain Duties and Responsibilities
	  	33
	 SECTION 5.2 Notice of Defaults
	  	34
	 SECTION 5.3 Certain Rights of Trustee
	  	35
	 SECTION 5.4 Not Responsible for Recitals or Issuance of Securities
	  	35
	 SECTION 5.5 May Hold Securities, Act as Trustee under Other Indentures
	  	36
	 SECTION 5.6 Money Held in Trust
	  	36
	 SECTION 5.7 Compensation and Reimbursement
	  	36
	 SECTION 5.8 Corporate Trustee Required; Eligibility
	  	37
	 SECTION 5.9 Resignation and Removal; Appointment of Successor
	  	37
	 SECTION 5.10 Acceptance of Appointment by Successor
	  	38
	 SECTION 5.11 Merger, Conversion, Consolidation or Succession to Business
	  	39
	 SECTION 5.12 Authenticating Agents
	  	39
	 SECTION 5.13 Disqualification; Conflicting Interests
	  	40
	 SECTION 5.14 Preferential Collection of Claims Against Company
	  	40
		
	 ARTICLE VI CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE
	  	40
	 SECTION 6.1 Company May Consolidate, Etc., Only on Certain Terms
	  	40
	 SECTION 6.2 Successor Substituted
	  	41
		
	 ARTICLE VII SUPPLEMENTAL INDENTURES
	  	41
	 SECTION 7.1 Supplemental Indentures without Consent of Holders of Securities
	  	41
	 SECTION 7.2 Supplemental Indentures with Consent of Holders of Securities
	  	42
	 SECTION 7.3 Execution of Supplemental Indentures
	  	43
	 SECTION 7.4 Effect of Supplemental Indentures
	  	43
	 SECTION 7.5 Reference in Securities to Supplemental Indentures
	  	44
	 SECTION 7.6 Notice of Supplemental Indentures
	  	44
		
	 ARTICLE VIII COVENANTS
	  	44
	 SECTION 8.1 Payment of Principal, Premium and Interest
	  	44
	 SECTION 8.2 Maintenance of Offices or Agencies
	  	44
	 SECTION 8.3 Money for Security Payments to Be Held in Trust
	  	45
	 SECTION 8.4 Existence
	  	46
	 SECTION 8.5 Statement by Officers as to Default
	  	46
	 SECTION 8.6 Delivery of Certain Information
	  	46

  

 ii 

			
	 SECTION 8.7 Incurrence of Indebtedness
	  	47
		
	 ARTICLE IX MAKE-WHOLE PROVISION
	  	47
		
	 ARTICLE X CONVERSION OF SECURITIES
	  	47
	 SECTION 10.1 Conversion Privilege and Conversion Rate
	  	47
	 SECTION 10.2 Exercise of Conversion Privilege
	  	48
	 SECTION 10.3 Fractions of Shares
	  	49
	 SECTION 10.4 Adjustment of Conversion Rate
	  	50
	 SECTION 10.5 Notice of Adjustments of Conversion Rate
	  	54
	 SECTION 10.6 Notice of Certain Corporate Action
	  	55
	 SECTION 10.7 Company to Reserve Common Stock
	  	56
	 SECTION 10.8 Taxes on Conversions
	  	56
	 SECTION 10.9 Covenant as to Common Stock
	  	56
	 SECTION 10.10 Cancellation of Converted Securities
	  	56
	 SECTION 10.11 Provision in Case of Consolidation, Merger or Sale of Assets
	  	56
	 SECTION 10.12 Responsibility of Trustee for Conversion Provisions
	  	57
	 SECTION 10.13 Automatic Conversion
	  	58
	 SECTION 10.14 Compensation for Buy-In on Failure to Timely Deliver Certificates Upon Conversion
	  	59
		
	 ARTICLE XI RANKING
	  	60
		
	 ARTICLE XII REPURCHASE OF SECURITIES AT THE OPTION OF THE HOLDER UPON A CHANGE IN CONTROL
	  	60
	 SECTION 12.1 Right to Require Repurchase
	  	60
	 SECTION 12.2 Notices; Method of Exercising Repurchase Right, Etc.
	  	61
		
	 ARTICLE XIII HOLDERS LISTS AND REPORTS BY TRUSTEE AND COMPANY; NON-RECOURSE
	  	63
	 SECTION 13.1 Company to Furnish Trustee Names and Addresses of Holders
	  	63
	 SECTION 13.2 Preservation of Information
	  	63
	 SECTION 13.3 No Recourse Against Others
	  	64
	 SECTION 13.4 Reports by Trustee
	  	64
	 SECTION 13.5 SECTION 13 or 15(d) Reports by Company
	  	64

  

 iii 

 CROSS-REFERENCE TABLE* 
  

					
	 TIA
SECTION
	  	 	  	 INDENTURE SECTION

	Section	  	310(a)(1)	  	5.8
		  	(a)(2)	  	5.8
		  	(a)(3)	  	NA**
		  	(a)(4)	  	NA**
		  	(a)(5)	  	5.8
		  	(b)	  	5.9, 5.10, 5.13
		  	(c)	  	N/A**
			
	Section	  	311(a)	  	5.14
		  	(b)	  	5.14
		  	(c)	  	N/A**
			
	Section	  	312(a)	  	13.1, 13.2
		  	(b)	  	13.2
		  	(c)	  	13.2
			
	Section	  	313(a)	  	13.4
		  	(b)(1)	  	N/A
		  	(b)(2)	  	13.4
		  	(c)	  	1.6, 13.4
		  	(d)	  	13.4
			
	Section	  	314(a)	  	1.5, 8.5, 8.6, 13.5
		  	(b)	  	N/A**
		  	(c)(1)	  	1.2
		  	(c)(2)	  	1.2
		  	(c)(3)	  	N/A**
		  	(d)	  	N/A**
		  	(e)	  	1.2
		  	(f)	  	N/A**
			
	Section	  	315(a)	  	5.1(a)
		  	(b)	  	1.6, 5.2
		  	(c)	  	5.1(b)
		  	(d)	  	5.1(c)
		  	(e)	  	4.14
			
	Section	  	316(a)(last sentence)	  	1.1
		  	(a)(1)(A)	  	4.12
		  	(a)(1)(B)	  	4.13
		  	(a)(2)	  	N/A
		  	(b)	  	4.8

  

 iv 

					
	 TIA
SECTION
	  	 	  	 INDENTURE SECTION

		  	(c)	  	1.4(e)
			
	Section	  	317(a)(1)	  	4.3
		  	(a)(2)	  	4.4
		  	(b)	  	3.2
			
	Section	  	318(a)	  	1.13

  

	*	This Cross-Reference Table shall not, for any purpose, be deemed a part of this Indenture. 

  

	**	N/A means Not Applicable 

  

 v 

 INDENTURE, dated as of September 15, 2008, between Cell Therapeutics, Inc., a corporation
duly organized and existing under the laws of the State of Washington, having its principal office at 501 Elliott Avenue West, Suite 400, Seattle, Washington 98119 (herein called the “Company”), and U.S. Bank National
Association, as Trustee hereunder (herein called the “Trustee”). 
 RECITALS OF THE COMPANY 
 The Company has duly authorized the creation of an issue of its 10% Convertible Senior Notes due 2012 (herein called the
“Securities”), of substantially the tenor and amount hereinafter set forth, and to provide therefor the Company has duly authorized the execution and delivery of this Indenture. 
 All things necessary to make the Securities, when the Securities are executed by the Company and authenticated and delivered hereunder, the valid
obligations of the Company and to make this Indenture a valid agreement of the Company, in accordance with their and its terms, have been done. Further, all things necessary to duly authorize the issuance of shares of common stock of the Company
issuable upon the conversion of the Securities, and to duly reserve for issuance the number of shares of Common Stock issuable upon such conversion, have been done. 
 NOW, THEREFORE, THIS INDENTURE WITNESSETH: 
 For and in consideration of the premises and the
purchase of the Securities by the Holders thereof, it is mutually covenanted and agreed, for the equal and proportionate benefit of all Holders of the Securities, as follows: 
 ARTICLE I 
 DEFINITIONS AND OTHER PROVISIONS 
 OF GENERAL APPLICATION 
 SECTION 1.1
Definitions. 
 For all purposes of this Indenture, except as otherwise expressly provided or unless the context otherwise
requires: 
 (a) the terms defined in this Article I have the meanings assigned to them in this Article I and include
the plural as well as the singular; 
 (b) all accounting terms not otherwise defined herein have the meanings assigned to them in accordance
with generally accepted accounting principles in the United States; and 
 (c) the words “herein,”
“hereof” and “hereunder” and other words of similar import refer to this Indenture as a whole and not to any particular Article, Section or other subdivision. 
 “Act,” when used with respect to any Holder of a Security, has the meaning specified in Section 1.4(a). 

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

 “Agent Members” means a member of, or a participant in, the Depositary. 
 “Aggregate Current Market Price” has the meaning specified in Section 10.4(e). 
 “American Depository Shares” means US. Dollar denominated forms of equity ownership held in deposit in a custodian bank and
evidenced by physical certificates of ownership (“American Depositary Receipts”) issued by a U.S. bank. 
 “Applicable
Procedures” means, with respect to any transfer or transaction involving a Global Security or beneficial interest therein, the rules and procedures of the Depositary for such Security, to the extent applicable to such transaction and as
in effect from time to time. 
 “Authenticating Agent” means any Person authorized pursuant to
Section 5.12 to act on behalf of the Trustee to authenticate Securities. 
 “Automatic Conversion” has
the meaning specified in Section 10.13. 
 “Automatic Conversion Date” has the meaning specified in
Section 10.13. 
 “Automatic Conversion Notice” has the meaning specified in Section 10.13.

 “Board of Directors” means either the board of directors of the Company or any duly authorized committee of that
board. 
 “Board Resolution” means a resolution duly adopted by the Board of Directors, a copy of which, certified by
the Secretary or an Assistant Secretary of the Company to have been duly adopted by the Board of Directors and to be in full force and effect on the date of such certification, shall have been delivered to the Trustee. 
 “Business Day,” when used with respect to any Place of Payment, Place of Conversion or any other place, as the case may be, means
each Monday, Tuesday, Wednesday, Thursday and Friday that is not a day on which banking institutions in such Place of Payment, Place of Conversion or other place, as the case may be, are authorized or obligated by law or executive order to close;
provided, however, that a day on which banking institutions in New York, New York are authorized or obligated by law or executive order to close shall not be a Business Day for purposes of Section 10.5. 
 “Cash Equivalents” means (1) securities issued or directly and fully guaranteed or insured by the United States government
or any agency or instrumentality thereof (provided that the full faith and credit of the United States is pledged in support thereof) having maturities of not more than six months from the date of acquisition, (2) certificates of deposit
and eurodollar time deposits with 

  

 2 

 
maturities of six months or less from the date of acquisition, bankers’ acceptances with maturities not exceeding six months and overnight bank
deposits, in each case with any domestic commercial bank having capital and surplus in excess of $500 million and a Thompson Bank Watch Rating of “B” or better, (3) repurchase obligations with a term of not more than seven
(7) days for underlying securities of the types described in clause (1) above entered into with any financial institution meeting the qualifications specified in clause (2) above, (4) commercial paper having the highest rating
obtainable from Moody’s Investors Service, Inc. or Standard & Poor’s Ratings Services and in each case maturing within six months after the date of acquisition and (5) money market funds at least ninety-five percent
(95%) of the assets of which constitute Cash Equivalents of the kinds described in clauses (1)-(4) of this definition. 
 “Change in Control” means the occurrence at any time, after the original issuance of the Securities, of any of the following events: 
 (1) the acquisition by any Person (including any syndicated group that would be deemed to be a “person” under Section 13(d)(3) of the Exchange Act) of beneficial ownership, directly or indirectly,
through a purchase, merger or other acquisition transaction or series of transactions, of shares of capital stock of the Company entitling such Person to exercise more than thirty three percent (33%) of the total voting power of all shares of
capital stock of the Company entitled to vote generally in the elections of directors, other than any such acquisition by the Company, any Subsidiary or any employee benefit plan of the Company; or 
 (2) any Person shall succeed in having sufficient of its nominees (who are not supported by a majority of the then current Board of Directors of the
Company) elected to the Board of Directors of the Company such that such nominees, when added to any existing directors remaining on the Board of Directors of the Company after such election who are Affiliates of or acting in concert with any such
Person, shall constitute a majority of the Board of Directors of the Company; or 
 (3) any consolidation or merger of the Company with or
into any other Person, or any merger of another Person with or into the Company (other than (A) a merger (i) that does not result in any reclassification, conversion, exchange or cancellation of outstanding shares of the Company’s
capital stock and (ii) pursuant to which holders of Common Stock immediately prior to such transaction have, directly or indirectly, sixty seven percent (67%) or more of the total voting power of all shares of capital stock or other
ownership interests entitled to vote generally in the election of directors of the continuing or surviving Person immediately after such transaction and (B) any merger that is effected solely to change the jurisdiction of incorporation of the
Company and results in a reclassification, conversion or exchange of outstanding shares of Common Stock solely into shares of common stock of the Company or another Person); or 
 (4) any conveyance, transfer, sale, lease or other disposition of all or substantially all of the Company’s assets to another Person. 
 For the purposes of this definition, “beneficial owner,” has the meaning attributed to it in Rules 13d-3 under the Exchange Act, whether or not
applicable. 
  

 3 

 “Closing Price” means, with respect to the Common Stock on any day, the closing
sale price regular way on such day or, in the case where no such sale takes place on such day, the average of the reported closing bid and asked prices, regular way, in each case on the Nasdaq Global Market or New York Stock Exchange, as applicable,
or, if the Common Stock is not listed or admitted to trading on such National Market or Exchange, on the principal national security exchange or quotation system on which such security is quoted or listed or admitted to trading, or, if not quoted or
listed or admitted to trading on any national securities exchange or quotation system, the average of the closing bid and asked prices of the Common Stock on the over-the-counter market on the day in question as reported by the National Quotation
Bureau Incorporated, or a similar generally accepted reporting service, or if not so available, in such manner as furnished by any New York Stock Exchange member firm selected from time to time by the Board of Directors for that purpose, or if no
bid or asked price is available a price determined in good faith by the Board of Directors, whose determination shall be conclusive and described in a Board Resolution. 
 “Code” has the meaning specified in Section 2.1. 
 “Combined
Cash and Tender Amount” has the meaning specified in Section 10.4(e). 
 “Combined Tender and Cash
Amount” has the meaning specified in Section 10.4(f). 
 “Commission” means the United
States 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. 
 “Common Stock” means the shares of the
class designated as common stock of the Company at the date of this Indenture or as such stock may be reconstituted from time to time. Subject to the provisions of Section 10.11, shares issuable on conversion or repurchase of Securities
shall include only shares of Common Stock or shares of any class or classes of common stock resulting from any reclassification or reclassifications thereof; provided, however, that if at any time there shall be more than one such
resulting class, the shares so issuable on conversion of Securities shall include shares of all such classes, and the shares of each such class then so issuable shall be substantially in the proportion that the total number of shares of such class
resulting from all such reclassifications bears to the total number of shares of all such classes resulting from all such reclassifications. 
 “Company” means the Person named as the “Company” in the first paragraph of this instrument until a successor Person shall have become such pursuant to the applicable provisions of this Indenture, and
thereafter “Company” shall mean such successor Person. 
 “Company Notice” has the meaning specified in
Section 12.2(a). 
 “Company Request” or “Company Order” means a written request
or order signed in the name of the Company by its Chairman of the Board, its Vice Chairman of the Board, its Chief Executive Officer, its President or a Vice President, and by its principal financial officer, Treasurer, an Assistant Treasurer, its
Secretary or an Assistant Secretary, and delivered to the Trustee. 
 “Completion Date” has the meaning specified in
Section 10.4(f). 
  

 4 

 “Constituent Person” has the meaning specified in Section 10.11.

 “Conversion Agent” means any Person authorized by the Company to convert Securities in accordance with
Article X. The Company has initially appointed the Trustee as its Conversion Agent. 
 “Conversion Price”
means the amount equal to U.S. $1,000 divided by the Conversion Rate. 
 “Conversion Date” means the date on
which both the Securities and the duly signed and completed notice have been delivered to the Trustee. 
 “Conversion
Rate” has the meaning specified in Section 10.1. 
 “Conversion Shares” has the meaning
specified in Section 10.4(m). 
 “Corporate Trust Office” means the office of the Trustee at which at any
particular time the trust created by this Indenture shall be administered (which at the date of this Indenture is located at 633 West Fifth Street, 24th Floor, Los Angeles, CA 90071, Attn: Corporate Trust Services (Cell Therapeutics, Inc. – 10%
Convertible Senior Notes due 2012)). 
 “Corporation” means a corporation, company, association, joint-stock company
or business trust. 
 “Defaulted Interest” has the meaning specified in Section 2.8. 
 “Depositary” means, with respect to any Registered Securities, a clearing agency that is registered as such under the Exchange
Act and is designated by the Company to act as Depositary for such Registered Securities (or any successor securities clearing agency so registered). 
 “Distribution Date” has the meaning specified in Section 10.4(m). 
 “Dollar” or “U.S. $” means a dollar or other equivalent unit in such coin or currency of the United States as at the time shall be legal tender for the payment of public and private
debts. 
 “DTC” means The Depository Trust Company, a New York corporation. 
 “Event of Default” has the meaning specified in Section 4.1. 
 “Exchange Act” means the United States Securities Exchange Act of 1934 (or any successor statute), as amended from time to time.

 “Existing Notes” means the Existing 2003 Senior Subordinated Notes, the Existing 2005 Senior Notes, the Existing
2006 Senior Notes, the Existing 2007 Senior Notes, the Existing 2008 Senior Notes, the Existing 2008 15% Senior Notes, the Existing 2008 18.33% Senior Notes and the Existing 2008 Series B 18.33% Senior Notes. 
 “Existing 2003 Senior Subordinated Notes” means the Company’s 4% Convertible Senior Subordinated Notes due July 1,
2010, issued under the Existing 2003 Senior Subordinated Notes Indenture. 
  

 5 

 “Existing 2003 Senior Subordinated Notes Indenture” means the Indenture dated as
of June 23, 2003, between the Company and the Trustee. 
 “Existing 2005 Senior Notes” means the Company’s
6.75% Convertible Senior Notes due October 31, 2010, issued under the Existing 2005 Senior Notes Indenture. 
 “Existing 2005
Senior Notes Indenture” means the Indenture dated November 4, 2005 by and between the Company and the Trustee. 
 “Existing 2006 Senior Notes” means the Company’s 7.5% Convertible Senior Notes due 2011, issued under the Existing 2006 Senior Notes Indenture. 
 “Existing 2006 Senior Notes Indenture” means the Indenture dated April 27, 2006 by and between the Company and the Trustee.

 “Existing 2007 Senior Notes” means the Company’s 5 3/4% Convertible Senior Notes due 2011, issued under the
Existing 2007 Senior Notes Indenture. 
 “Existing 2007 Senior Notes Indenture” means the Indenture dated
December 12, 2007 by and between the Company and the Trustee. 
 “Existing 2008 Senior Notes” means the
Company’s 9% Convertible Senior Notes due 2012, issued under the Existing 2008 Senior Notes Indenture. 
 “Existing 2008
Senior Notes Indenture” means the Indenture dated March 3, 2008 by and between the Company and the Trustee. 
 “Existing 2008 15% Senior Notes” means the Company’s 15% Convertible Senior Notes due 2011, issued under the Existing 2008 15% Senior Notes Indenture. 
 “Existing 2008 15% Senior Notes Indenture” means the Indenture dated June 12, 2008 by and between the Company and the
Trustee. 
 “Existing 2008 18.33% Senior Notes” means the Company’s 18.33% Convertible Senior Notes due 2011,
issued under the Existing 2008 18.33% Senior Notes Indenture. 
 “Existing 2008 18.33% Senior Notes Indenture” means
the Indenture dated July 24, 2008 by and between the Company and the Trustee. 
 “Existing 2008 Series B 18.33% Senior
Notes” means the Company’s Series B 18.33% Convertible Senior Notes due 2011, issued under the Existing 2008 Series B 18.33% Senior Notes Indenture. 
 “Existing 2008 Series B 18.33% Senior Notes Indenture” means the Indenture dated August 19, 2008 by and between the Company and the Trustee. 
 “GAAP” means generally accepted accounting principles. 
  

 6 

 “Global Security” means a Registered Security that is registered in the Security
Register in the name of a Depositary or a nominee thereof. 
 “Holder” means the Person in whose name the Security is
registered in the Security Register. 
 “Indebtedness” means the principal of (and premium, if any) and interest
(including all interest accruing subsequent to the commencement of any bankruptcy or similar proceeding, whether or not a claim for post-petition interest is allowable as a claim in any such proceeding) on, and rent payable on or in connection with,
and all fees, costs, claims, expenses and other amounts payable in connection with, the following, whether absolute or contingent, secured or unsecured, due or to become due, outstanding on the date of this Indenture or thereafter created, incurred
or assumed: (1) all the Company’s indebtedness evidenced by a credit or loan agreement, note, bond, debenture, or other similar instrument whether or not the recourse of the lender is to all of the Company’s assets or only to a
portion, (2) all of the Company’s indebtedness, obligations and other liabilities, contingent or otherwise, for borrowed money, including, without limitation, overdrafts, foreign exchange contracts, currency exchange agreements, interest
rate protection agreements and any loans or advances from banks, whether or not evidenced by notes or similar instruments, or bonds, debentures, notes or similar instruments, whether or not the recourse of the lender is to all of the Company’s
assets or only to a portion thereof, (3) all of the Company’s obligations as lessee under leases required to be capitalized on the balance sheet of the lessee under GAAP, (4) all of the Company’s obligations and other
liabilities, contingent or otherwise, under any lease or related document, including a purchase agreement, in connection with the lease of real property or improvements, or any personal property included as part of any such lease, which provides
that the Company is contractually obligated to purchase or cause a third party to purchase the leased property and thereby guarantee a residual value of leased property to the lessor and all of the Company’s obligations under such lease or
related document to purchase or cause a third party to purchase the leased property, whether or not such lease transaction is characterized as an operating lease or capitalized lease in accordance with generally accepted accounting principles,
(5) all of the Company’s obligations under interest rate and currency swaps, caps, floors, collars, hedge agreements, forward contracts, or similar agreements or arrangements, (6) all of the Company’s obligations with respect to
letters of credit, bank guarantees, bankers’ acceptances and similar facilities, including related reimbursement obligations, (7) all of the Company’s obligations issued or assumed as the deferred purchase price of property or
services (but excluding trade accounts payable and accrued liabilities arising in the ordinary course of business), (8) all of the Company’s obligations of the type referred to in clauses (1) through (7) above of another Person
and all dividends of another Person, the payment of which, in either case, the Company has assumed or guaranteed or for which the Company is responsible or liable, directly or indirectly, jointly or severally, as obligor, guarantor or otherwise or
which is secured by a lien on the Company’s property and (9) renewals, extensions, modifications, replacements, restatements and refundings of, or any indebtedness or obligation issued in exchange for, any such indebtedness or obligation
described in clauses (1) through (8) of this definition; provided, however, that Indebtedness shall not include accounts payable or other accrued liabilities or obligations incurred in the ordinary course of business in connection
with the obtaining of materials or services and any indebtedness or obligation that the Company may owe to any direct or indirect Subsidiary and obligations owed to a Person specified in clause (11) of the definition of Permitted Lien in
connection with the licensing and/or partnering arrangement referred to therein. 
  

 7 

 “Indenture” means this instrument as originally executed or as it may from time
to time be supplemented or amended by one or more indentures supplemental hereto entered into pursuant to the applicable provisions hereof, including, for all purposes of this instrument and any such supplemental indenture, the provisions of the
Trust Indenture Act that are deemed to be a part of and govern this instrument and any such supplemental indenture, respectively. 
 “Interest Payment Date” means the Stated Maturity of an installment of interest on the Securities. 
 “Lien” means, with respect to any asset, any mortgage, lien, pledge, charge, security interest or encumbrance of any kind with respect to such asset. 
 “Maturity,” when used with respect to any Security, means the date on which the principal of such Security becomes due and
payable as therein or herein provided, whether at the Stated Maturity or by declaration of acceleration, conversion, exercise of the repurchase right set forth in Article XII or otherwise. 
 “Make-Whole Payment” has the meaning specified in Article IX. 
 “Member” means any member of, or participant in, the Depositary. 
 “New Rights Plan” has the meaning specified in Section 10.4(d) 
 “Non-electing Share” has the meaning specified in Section 10.11. 
 “Notice of Default” has the meaning specified in Section 4.1. 
 “Officers’ Certificate” means a certificate signed by the Chairman of the Board, a Vice Chairman of the Board, the Chief
Executive Officer, the President or a Vice President and by the principal financial officer, the Treasurer, an Assistant Treasurer, the Secretary or an Assistant Secretary of the Company, and delivered to the Trustee. 
 “Opinion of Counsel” means a written opinion of counsel, who may be counsel for or employed by the Company and who shall be
acceptable to the Trustee. 
 “Outstanding,” when used with respect to Securities, means, as of the date of
determination, all Securities theretofore authenticated and delivered under this Indenture, except: 
 (1) securities theretofore cancelled
by the Trustee or delivered to the Trustee for cancellation; 
 (2) securities for the payment of which money in the necessary amount has
been theretofore deposited with the Trustee or any Paying Agent (if other than the Company) in trust or set aside and segregated in trust by the Company (if the Company shall act as its own Paying Agent) for the Holders of such Securities; and

  

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 (3) securities that have been paid pursuant to Section 2.7 or in exchange for or in lieu of
which other Securities have been authenticated and delivered pursuant to this Indenture, other than any such Securities in respect of which there shall have been presented to the Trustee proof satisfactory to it that such Securities are held by a
bona fide purchaser in whose hands such Securities are valid obligations of the Company; 
 provided, however, that in determining whether the
Holders of the requisite principal amount of Outstanding Securities are present at a meeting of Holders of Securities for quorum purposes or have given any request, demand, authorization, direction, notice, consent or waiver hereunder, Securities
owned by the Company or any other obligor upon the Securities or any Affiliate of the Company or such other obligor shall be disregarded and deemed not to be Outstanding, except that, in determining whether the Trustee shall be protected in relying
upon any such determination as to the presence of a quorum or upon any such request, demand, authorization, direction, notice, consent or waiver, only Securities that a Responsible Officer of the Trustee actually knows to be so owned shall be so
disregarded. Securities so owned that have been pledged in good faith may be regarded as Outstanding if the pledgee establishes to the satisfaction of the Trustee the pledgee’s right so to act with respect to such Securities and that the
pledgee is not the Company or any other obligor upon the Securities or any Affiliate of the Company or such other obligor. 
 “Paying Agent” means any Person authorized by the Company to pay the principal of or interest on any Securities on behalf of the Company and, except as otherwise specifically set forth herein, such term shall include
the Company if it shall act as its own Paying Agent. The Company has initially appointed the Trustee as its Paying Agent. 
 “Permitted Lien” means the following types of Liens: 
 (1) Liens imposed by law for taxes, fees,
assessments or other governmental charges or levies that are not yet due and payable or are being contested in good faith by appropriate proceedings as to which the Company or its Subsidiaries shall have set aside on its books such reserves as may
be required pursuant to GAAP; 
 (2) carriers’, warehousemen’s, mechanics’, materialmen’s, repairmen’s,
vendors’ or lessors’ Liens (and deposits to obtain the release of such Liens), set-off rights and other like Liens imposed by law (or contract, to the extent that such contractual Liens are similar in nature and scope to Liens imposed by
law), in each case arising in the ordinary course of business and securing obligations that either (a) are not overdue by more than sixty (60) days or (ii) are being contested in good faith by appropriate proceedings as to which the
Company or its Subsidiaries shall have set aside on its books such reserves as may be required pursuant to GAAP; 
 (3) Liens incurred and
pledges and deposits made in the ordinary course of business in connection with workers’ compensation, disability or unemployment insurance, old-age pensions, retiree health benefits and other similar plans or programs and other social security
laws or regulations; 
 (4) deposits to secure the performance of bids, trade contracts, leases, statutory obligations, surety and appeal
bonds, performance bonds and other obligations of a like nature, in each case in the ordinary course of business; 
  

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 (5)(a) easements, covenants, conditions, restrictions, zoning restrictions, building codes, land use
laws, leases, subleases, licenses, rights of way, minor irregularities in, or lack of, title and similar encumbrances affecting real property, (b) with respect to any lessee’s or licensee’s interest in real or personal property,
mortgages, liens, rights and obligations and other encumbrances arising by, through or under any owner, lessor or licensor thereof, with or without the lessee’s or licensee’s consent and (c) leases, licenses, rights and obligations in
connection with patents, copyrights, trademarks, tradenames and other intellectual property, in each case that do not secure the payment of borrowed money (other than, with respect to any lessee’s or licensee’s interest in real or personal
property, mortgages, liens, rights and obligations and other encumbrances arising by, through or under any owner, lessor or licensor thereof) to the extent, in the case of each of clauses (a), (b) and (c), that the Liens referred to therein do
not, in the aggregate, materially detract from the value of the affected property as used by the Company and its Subsidiaries in the ordinary course of business taken as a whole or materially interfere with the ordinary conduct of the business of
the Company and its Subsidiaries taken as a whole; 
 (6) Liens in favor of customs and revenue authorities to secure payment of customs
duties in connection with the importation of goods; 
 (7) any interest or title of a lessor under any capitalized lease obligation;
provided, however, that such Liens do not extend to any property or assets which is not leased property subject to such capitalized lease obligation; 
 (8) Liens securing purchase money indebtedness incurred in the ordinary course of business; provided, however, that (a) such purchase money indebtedness shall not exceed the purchase price or other cost of
such property or equipment and shall not be secured by any property or equipment of the Company or any Subsidiary of the Company other than the property and equipment so acquired and (b) the Lien securing such purchase money indebtedness shall
be created within ninety (90) days of such acquisition; 
 (9) Liens securing interest swap obligations which interest swap obligations
relate to Indebtedness that is otherwise permitted under the indenture; 
 (10) Liens securing Indebtedness under currency agreements;

 (11) Liens in favor of Strategic Partners in connection with a biopharmaceutical licensing and/or partnering arrangement; 
 (12) judgment Liens not giving rise to an Event of Default so long as such Lien is adequately bonded and any appropriate legal proceedings which may have
been duly initiated for the review of such judgment shall not have been finally terminated or the period within which such proceedings may be initiated shall not have expired; 
 (13) Liens upon specific items of inventory or other goods and proceeds of any Person securing such Person’s obligations in respect of bankers’
acceptances issued or created for the account of such Person to facilitate the purchase, shipment or storage of such inventory or other goods; 
 (14) Liens securing reimbursement obligations with respect to commercial letters of credit which encumber documents and other property relating to such letters of credit and products and proceeds thereof; 
  

 10 

 (15) banker’s Liens, rights of setoff and similar Liens with respect to cash and Cash Equivalents on
deposit in one or more bank accounts in the ordinary course of business; and 
 (16) Liens arising from filing Uniform Commercial Code
financing statements regarding leases. 
 “Person” means a natural person, Corporation, limited liability company,
partnership, joint venture, trust, estate, unincorporated organization or government or any agency or political subdivision thereof. 
 “Place of Conversion” has the meaning specified in Section 2.2. 
 “Place of
Payment” has the meaning specified in Section 2.2. 
 “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 2.7 in exchange for or in lieu of a mutilated, destroyed, lost or stolen Security shall be deemed to evidence the same debt as the mutilated, destroyed, lost or stolen Security. 
 “Record Date” means any Regular Record Date or Special Record Date. 
 “Record Date Period” means the period from the close of business of any Regular Record Date next preceding any Interest Payment
Date to the opening of business on such Interest Payment Date. 
 “Registered Common Stock” means Common Stock that
does not require registration or approval under any federal securities law or, if applicable, the securities laws of any state where a holder is located, before such shares are freely transferable without being subject to transfer restrictions under
the Securities Act. 
 “Registered Securities” has the meaning specified in Section 2.1. 
 “Regular Record Date” for interest payable in respect of any Registered Security on any Interest Payment Date means the
May 1 and the November 1 (whether or not a Business Day), as the case may be, next preceding such Interest Payment Date. 
 “Repurchase Date” has the meaning specified in Section 12.1. 
 “Repurchase
Price” has the meaning specified in Section 12.1. 
 “Responsible Officer,” when used with
respect to the Trustee, means any officer within the Corporate Trust Office, including without limitation any vice president, assistant vice president, assistant treasurer, corporate trust officer or other employee of the Trustee customarily
performing functions similar to those performed by any of the above designated officers, and also means, with respect to a particular corporate trust matter, any other officer to whom such matter is referred because of his knowledge and familiarity
with the particular subject. 
  

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 “Restricted Global Security” has the meaning specified in
Section 2.1. 
 “Secured Indebtedness” means Indebtedness secured by a Lien other than a Permitted Lien.

 “Securities” has the meaning ascribed to it in the first paragraph under the caption “Recitals of the
Company.” 
 “Securities Act” means the United States Securities Act of 1933 (or any successor statute), as
amended from time to time. 
 “Security Register” and “Security Registrar” have the
respective meanings specified in Section 2.6. 
 “Significant Subsidiary” means any Subsidiary that would
be a “significant subsidiary” as defined in Article 1, Rule 1-02 of Regulation S-X, promulgated pursuant to the Securities Act, as such regulation is in effect on the date hereof. 
 “Special Record Date” for the payment of any Defaulted Interest means a date fixed by the Company pursuant to
Section 2.8. 
 “Stated Maturity,” when used with respect to any Security or any installment of interest
thereon, means the date specified in such Security as the fixed date on which the principal of such Security or such installment of interest is due and payable. 
 “Strategic Partner” means (i) a pharmaceutical or biotechnology company with book equity of at least U.S. $200,000,000, (ii) a pharmaceutical or biotechnology company with sales
of at least U.S. $150,000,000, or (iii) a publicly traded, or division or subdivision of a publicly traded, pharmaceutical or biotechnology company with market capitalization in excess of U.S. $200,000,000. 
 “Subsidiary” means a Person more than fifty percent (50%) of the outstanding voting stock of which is owned, directly or
indirectly, by the Company or by one or more other Subsidiaries, or by the Company and one or more other Subsidiaries. For the purposes of this definition, “voting stock” means stock or other similar interests in the Person that ordinarily
has or have voting power for the election of directors or Persons performing similar functions, whether at all times or only so long as no senior class of stock or other interests has or have such voting power by reason of any contingency.

 “Successor Security” of any particular Security means every Security issued after, and 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 2.7 in exchange for or in lieu of a mutilated, destroyed, lost or stolen
Security shall be deemed to evidence the same debt as the mutilated, destroyed, lost or stolen Security. 
 “Trading
Day” means: (1) if the Common Stock is listed or admitted for trading on any national securities exchange, days on which such national securities exchange is open for business; (2) if the Common Stock is quoted on the Nasdaq
Global Market or any other system of automated dissemination of quotations of securities prices, days on which trades may be effected through such 

  

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system; or (3) if the Common Stock is not listed or admitted for trading on any national securities exchange or quoted on the Nasdaq Global Market or
any other system of automated dissemination of quotation of securities prices, days on which the Common Stock is traded regular way in the over-the-counter market and for which a closing bid and a closing asked price for the Common Stock are
available. 
 “Trust Indenture Act” means the Trust Indenture Act of 1939 as in force at the date as of which this
instrument was executed; provided, however, that in the event the Trust Indenture Act of 1939 is amended after such date, “Trust Indenture Act” means, to the extent required by any such amendment, the Trust Indenture Act of 1939 as
so amended. 
 “Trustee” means the Person named as the “Trustee” in the first paragraph of this instrument
until a successor Trustee shall have become such pursuant to the applicable provisions of this Indenture, and thereafter “Trustee” shall mean such successor Trustee. 
 “United States” means the United States of America (including the several States and the District of Columbia), its territories,
its possessions and other areas subject to its jurisdiction (its “possessions” including Puerto Rico, the United States Virgin Islands, Guam, American Samoa, Wake Island and the Northern Mariana Islands). 
 “Vice President,” when used with respect to the Company, means any vice president, whether or not designated by a number or a
word or words added before or after the title “vice president.” 
 “Volume Weighted Average Price” means,
with respect to the Common Stock of the Company, for any day the volume weighted average price per share of Common Stock as displayed on Bloomberg on the Nasdaq Global Market from 9:30 a.m. to 4:00 p.m. (New York City time) on that day (or if such
volume weighted average price is not available, the market value of one share on such day as the Company determines in good faith using a volume weighted method). 
 SECTION 1.2 Compliance Certificates and Opinions. 
 Upon any application or request by the
Company to the Trustee to take any action under any provision of this Indenture, the Company shall furnish to the Trustee an Officers’ Certificate stating that all conditions precedent, if any, provided for in this Indenture relating to the
proposed action have been complied with and, if required by the Trust Indenture Act, an Opinion of Counsel stating that in the opinion of such counsel all such conditions precedent, if any, have been complied with, except that in the case of any
such application or request as to which the furnishing of such documents is specifically required by any provision of this Indenture relating to such particular application or request, no additional certificate or opinion need be furnished. Every
certificate or opinion with respect to compliance with a condition or covenant provided for in this Indenture shall include: 
 (a) a
statement that each individual signing such certificate or opinion has read such covenant or condition and the definitions herein relating thereto; 
 (b) 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; 
  

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 (c) a statement that, in the opinion of such individual, he has made such examination or investigation as
is necessary to enable him to express an informed opinion as to whether or not such covenant or condition has been complied with; and 
 (d)
a statement as to whether, in the opinion of each such individual, such condition or covenant has been complied with; provided, however, with respect to matters of fact, an Opinion of Counsel may rely on an Officers’ Certificate or
certificates of public officials. 
 SECTION 1.3 Form of Documents Delivered to the Trustee. 
 In any case where several matters are required to be certified by, or covered by an opinion of, any specified Person, it is not necessary that all such
matters be certified by, or covered by the opinion of, only one such Person, or that they be so certified or covered by only one document, but one such Person may certify or give an opinion with respect to some matters and one or more other such
Persons as to other matters, and any such Person may certify or give an opinion as to such matters in one or several documents. 
 Any
certificate or opinion of an officer of the Company may be based, insofar as it relates to legal matters, upon a certificate or opinion of, or representations by, counsel, unless such officer knows, or in the exercise of reasonable care should know,
that the certificate or opinion or representations with respect to the matters upon which such certificate or opinion is based are erroneous. Any such certificate or opinion of counsel may be based, insofar as it relates to factual matters, upon a
certificate or opinion of, or representations by, an officer or officers of the Company or any other Person stating that the information with respect to such factual matters is in the possession of the Company or such other Person, unless such
counsel knows, or in the exercise of reasonable care should know, that the certificate or opinion or representations with respect to such matters are erroneous. 
 Where any Person is required to make, give or execute two or more applications, requests, consents, certificates, statements, opinions or other instruments under this Indenture, they may, but need not, be consolidated
and form one instrument. 
 SECTION 1.4 Acts of Holders of Securities. 
 (a) Any request, demand, authorization, direction, notice, consent, waiver or other action provided or permitted by this Indenture to be given or taken by
Holders of Securities may be embodied in and evidenced by one or more instruments of substantially similar tenor signed by such Holders in person or by an agent or proxy duly appointed in writing by such Holders. Such action shall become effective
when such instrument or instruments is delivered to the Trustee and, where it is hereby expressly required, to the Company. The Trustee shall promptly deliver to the Company copies of all such instruments delivered to the Trustee. Such instrument or
instruments (and the action embodied therein and evidenced thereby) are herein sometimes referred to as the “Act” of the Holders of Securities signing such instrument or instruments. Proof of execution of any such instrument
or of a writing appointing any such agent or proxy, or of the holding by any Person of a Security, shall be sufficient for any purpose of this Indenture and (subject to Section 5.1) conclusive in favor of the Trustee and the Company if
made in the manner provided in this Section 1.4. 
  

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 (b) The fact and date of the execution by any Person of any such instrument or writing may be proved by
the affidavit of a witness of such execution or by a certificate of a notary public or other officer authorized by law to take acknowledgments of deeds, certifying that the individual signing such instrument or writing acknowledged to him the
execution thereof. Where such execution is by a signer acting in a capacity other than his individual capacity, such certificate or affidavit shall also constitute sufficient proof of his authority. 
 (c) The principal amount and serial number of any Registered Security held by any Person, and the date of his holding the same, shall be proved by the
Security Register. 
 (d) The fact and date of execution of any such instrument or writing and the authority of the Person executing the same
may also be proved in any other manner that the Trustee deems sufficient; and the Trustee may in any instance require further proof with respect to any of the matters referred to in this Section 1.4. 
 (e) The Company may set any day as the record date for the purpose of determining the Holders entitled to give or take any request, demand,
authorization, direction, notice, consent, waiver or other action, or to vote on any action, authorized or permitted by this Indenture to be given or taken by Holders. Promptly and in any case not later than ten (10) days after setting a record
date, the Company shall notify the Trustee and the Holders of such record date. If not set by the Company prior to the first solicitation of a Holder made by any Person in respect of any such action, or, in the case of any such vote, prior to such
vote, the record date for any such action or vote shall be the thirtieth (30th) day (or, if later, the date of the most recent list of Holders required to be provided pursuant to Section 13.1) prior to such first solicitation or
vote, as the case may be. With regard to any record date, the Holders on such date (or their duly appointed agents or proxies), and only such Persons, shall be entitled to give or take, or vote on, the relevant action, whether or not such Holders
remain Holders after such record date. Notwithstanding the foregoing, the Company shall not set a record date for, and the provisions of this paragraph shall not apply with respect to, any notice, declaration or direction referred to in the next
paragraph. 
 Upon receipt by the Trustee from any Holder of (1) any Notice of Default or breach referred to in
Section 4.1(d), if such default or breach has occurred and is continuing and the Trustee shall not have given such a notice to the Company, (2) any declaration of acceleration referred to in Section 4.2, if an Event of
Default has occurred and is continuing and the Trustee shall not have given such a declaration to the Company, or (3) any direction referred to in Section 4.12, if the Trustee shall not have taken the action specified in such
direction, then, with respect to clauses (2) and (3), a record date shall automatically and without any action by the Company or the Trustee be set for determining the Holders entitled to join in such declaration or direction, which record date
shall be the close of business on the tenth (10th) day (or, if such day is not a Business Day, the next succeeding Business Day) following the day on which the Trustee receives such declaration or direction, and, with respect to clause (1), the
Trustee may set any day as a record date for the purpose of determining the Holders entitled to join in such Notice of Default. Promptly after such receipt by the Trustee of any such declaration or direction referred to in clause (2) or (3),
and promptly after setting any record date with respect to clause (1), and as soon as practicable thereafter, the Trustee shall notify the Company and the Holders of any such record date so fixed. The Holders on such record date (or their duly
appointed agents or proxies), and only such Persons, shall be entitled to join in such notice, declaration or direction, whether or not such Holders remain 

  

 15 

 
Holders after such record date; provided, however, that, unless such notice, declaration or direction shall have become effective by virtue of Holders
of the requisite principal amount of Securities on such record date (or their duly appointed agents or proxies) having joined therein on or prior to the ninetieth (90th) day after such record date, such notice, declaration or direction shall
automatically and without any action by any Person be cancelled and of no further effect. Nothing in this paragraph shall be construed to prevent a Holder (or a duly appointed agent or proxy thereof) from giving, before or after the expiration of
such 90-day period, a notice, declaration or direction contrary to or different from, or, after the expiration of such period, identical to, the notice, declaration or direction to which such record date relates, in which event a new record date in
respect thereof shall be set pursuant to this paragraph. In addition, nothing in this paragraph shall be construed to render ineffective any notice, declaration or direction of the type referred to in this paragraph given at any time to the Trustee
and the Company by Holders (or their duly appointed agents or proxies) of the requisite principal amount of Securities on the date such notice, declaration or direction is so given. 
 (f) Except as provided in Sections 4.2 and 4.13, any request, demand, authorization, direction, notice, consent, election, waiver or other
Act of the Holder of any Security shall bind every future Holder of the same Security and the Holder of every Security issued upon the registration of transfer thereof or in exchange therefor or in lieu thereof in respect of anything done, omitted
or suffered to be done by the Trustee or the Company in reliance thereon, whether or not notation of such action is made upon such Security. 
 SECTION 1.5 Notices, Etc., to Trustee and Company. 
 Any request, demand, authorization, direction, notice, consent,
election, waiver or other Act of Holders of Securities or other document provided or permitted by this Indenture to be made upon, given or furnished to, or filed with: 
 (a) the Trustee by any Holder of Securities or by the Company shall be sufficient for every purpose hereunder if made, given, furnished or filed in writing to or with the Trustee and received at the Corporate Trust
Office, Attention: Corporate Trust Services (Cell Therapeutics, Inc. – 10% Convertible Senior Notes due 2012), and shall be deemed given when received; or 
 (b) the Company by the Trustee or by any Holder of Securities shall be sufficient for every purpose hereunder (unless otherwise herein expressly provided) if in writing, mailed, first-class postage prepaid, or
telecopied and confirmed by mail, first-class postage prepaid, or delivered by hand or overnight courier, addressed to the Company at 501 Elliott Avenue West, Suite 400, Seattle, Washington 98119, Attention: Louis A. Bianco (telecopy no.:
(206) 284-6206), or at any other address previously furnished in writing to the Trustee by the Company, and shall be deemed given when received. 
 Any request, demand, authorization, direction, notice, consent, election or waiver required or permitted under this Indenture shall be in the English language, except that any published notice may be in an official
language of the country of publication. 
  

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 SECTION 1.6 Notice to Holders of Securities; Waiver. 
 Except as otherwise expressly provided herein, where this Indenture provides for notice to Holders of Securities of any event, such notice shall be
sufficiently given to Holders if in writing and mailed, first-class postage prepaid, to each Holder of a Security affected by such event, at the address of such Holder as it appears in the Security Register, not earlier than the earliest date and
not later than the latest date prescribed for the giving of such notice. 
 Neither the failure to mail such notice, nor any defect in any
notice so mailed, to any particular Holder of a Registered Security shall affect the sufficiency of such notice with respect to other Holders of Registered Securities. In case by reason of the suspension of regular mail service or by reason of any
other cause it shall be impracticable to give such notice by mail, then such notification to Holders of Registered Securities as shall be made with the approval of the Trustee, which approval shall not be unreasonably withheld or delayed, shall
constitute a sufficient notification to such Holders for every purpose hereunder. 
 Such notice shall be deemed to have been given when such
notice is mailed. 
 Where this Indenture provides for notice in any manner, such notice may be waived in writing by the Person entitled to
receive such notice, either before or after the event, and such waiver shall be the equivalent of such notice. Waivers of notice by Holders of Securities shall be filed with the Trustee, but such filing shall not be a condition precedent to the
validity of any action taken in reliance upon such waiver. 
 SECTION 1.7 Effect of Headings and Table of Contents. 

The Article and Section headings herein and the Table of Contents are for convenience only and shall not affect the construction hereof. 
 SECTION 1.8 Successors and Assigns. 
 All covenants and agreements in this Indenture by the Company and by the Trustee shall bind its successors and assigns, whether so expressed or not. 
 SECTION 1.9 Separability Clause. 
 In case any provision in this Indenture or the Securities
shall be invalid, illegal or unenforceable, the validity, legality and enforceability of the remaining provisions shall not in any way be affected or impaired thereby. 
 SECTION 1.10 Benefits of Indenture. 
 Nothing in this Indenture or in the Securities, express
or implied, shall give to any Person, other than the parties hereto and their successors and assigns hereunder and the Holders of Securities, any benefit or legal or equitable right, remedy or claim under this Indenture. 
  

 17 

 SECTION 1.11 Governing Law. 
 THIS INDENTURE AND THE SECURITIES SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK, THE UNITED STATES OF
AMERICA, INCLUDING, WITHOUT LIMITATION, THE NEW YORK GENERAL OBLIGATIONS LAW §5-1401. 
 SECTION 1.12 Legal Holidays. 

 In any case where any Interest Payment Date, Repurchase Date or Stated Maturity of any Security or the last day on which a Holder of a
Security has a right to convert his Security shall not be a Business Day at a Place of Payment or Place of Conversion, as the case may be, then (notwithstanding any other provision of this Indenture or of the Securities) payment of principal of,
premium, if any, or interest on, or the payment of the Repurchase Price with respect to, or delivery for conversion of, such Security need not be made at such Place of Payment or Place of Conversion, as the case may be, on or by such day, but may be
made on or by the next succeeding Business Day at such Place of Payment or Place of Conversion, as the case may be, with the same force and effect as if made on the Interest Payment Date or Repurchase Date, or at the Stated Maturity or by such last
day for conversion; provided, however, that in the case that payment is made on such succeeding Business Day, no interest shall accrue on the amount so payable for the period from and after such Interest Payment Date, Repurchase Date, Stated
Maturity or last day for conversion, as the case may be. 
 SECTION 1.13 Conflict with Trust Indenture Act. 
 If any provision hereof limits, qualifies or conflicts with a provision of the Trust Indenture Act that is required under such act to be a part of and
govern this Indenture, the latter provision shall control. If any provision of this Indenture modifies or excludes any provision of the Trust Indenture Act that may be so modified or excluded, the latter provision shall be deemed to apply to this
Indenture as so modified or to be excluded, as the case may be. Until such time as this Indenture shall be qualified under the Trust Indenture Act, this Indenture, the Company and the Trustee shall be deemed for all purposes hereof to be subject to
and governed by the Trust Indenture Act to the same extent as would be the case if this Indenture were so qualified on the date hereof. 
 SECTION 1.14 Counterparts. 
 This instrument may be executed in any number of counterparts, each of which so executed
shall be deemed to be an original, but all such counterparts shall together constitute but one and the same instrument. 
 ARTICLE II 

 THE SECURITIES 
 SECTION 2.1 Form Generally. 
 The Securities and the Trustee’s certificate of authentication shall be in
substantially the form set forth in Exhibit A hereto, which Exhibit is incorporated into this Indenture, with such appropriate insertions, omissions, substitutions and other variations as are required or permitted by this 

  

 18 

 
Indenture, and may have such letters, numbers or other marks of identification and such legends or endorsements placed thereon as may be required to comply
with the rules of any securities exchange or the Internal Revenue Code of l986, as amended, and regulations thereunder (the “Code”), or as may, consistently herewith, be determined by the officers executing such Securities,
as evidenced by their execution thereof. All Securities shall be issued in registered form, as opposed to bearer form, and shall sometimes be referred to as the “Registered Securities.” 
 The Securities shall be printed, lithographed, typewritten or engraved or produced by any combination of these methods on steel engraved borders, if so
required by any securities exchange upon which the Securities may be listed, or may be produced in any other manner permitted by the rules of any such securities exchange, or, if the Securities are not listed on a securities exchange, in any other
manner approved by the Company, all as determined by the officers executing such Securities, as evidenced by their execution thereof. 
 Upon
their original issuance, Securities shall be issued in the form of one or more Global Securities without interest coupons and shall be registered in the name of DTC, as Depositary, or its nominee and deposited with the Trustee, as custodian for DTC,
for credit by DTC to the respective accounts of beneficial owners of the Securities represented thereby (or such other accounts as they may direct). Such Global Security, together with its Successor Securities that are Global Securities, are
collectively herein called the “Restricted Global Security.” 
 SECTION 2.2 Title and Terms.

 The aggregate principal amount of Securities that may be authenticated and delivered under this Indenture is limited to U.S.
$9,000,000, except for Securities authenticated and delivered in exchange for, or in lieu of, other Securities pursuant to Section 2.5, 2.6, 2.7, 7.5, 10.2 or 12.2(e). 
 The Securities shall be known and designated as the “10% Convertible Senior Notes due 2012” of the Company. Their Stated Maturity shall be
September 15, 2012 and they shall bear interest on their principal amount from September 15, 2008, payable semiannually in arrears on May 15 and November 15 in each year, commencing November 15, 2008, at the rate of
10% per annum until the principal thereof is due and at the rate then in effect on any overdue principal and, to the extent permitted by law, on any overdue interest; provided, however, that payments shall only be made on Business Days
as provided in Section 1.12. 
 The principal of, premium, if any, interest and Make-Whole Payment on the Securities shall be
payable as provided in the form of Securities attached hereto as Exhibit A, and the Repurchase Price shall be payable at such places as are identified in the Company Notice given pursuant to Section 12.2 (any city in which
any Paying Agent is located being herein called a “Place of Payment”). 
 The Securities shall be convertible as
provided in Article X (any city in which any Conversion Agent is located being herein called a “Place of Conversion”). 
 The Securities shall be subject to repurchase by the Company at the option of the Holders as provided in Article XII. 
  

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 SECTION 2.3 Denominations. 
 The Securities shall be issuable only in registered form, without interest coupons, in any denomination. 
 SECTION 2.4 Execution, Authentication, Delivery and Dating. 
 The Securities shall be executed on behalf of the Company by its Chairman of the Board, its Vice Chairman of the Board, its Chief Executive Officer, its President, one of its Vice Presidents, its Chief Financial
Officer, its Treasurer or its Controller and attested by its Secretary or one of its Assistant Secretaries. Any such signature may be manual or facsimile. 
 Securities bearing the manual or facsimile signature of individuals who were at any time the proper officers of the Company shall bind the Company, notwithstanding that such individuals or any of them have ceased to
hold such offices prior to the authentication and delivery of such Securities or did not hold such offices at the date of such Securities. 
 At any time and from time to time after the execution and delivery of this Indenture, the Company may deliver Securities executed by the Company to the Trustee or to its order for authentication, together with a Company Order for the
authentication and delivery of such Securities, and the Trustee in accordance with such Company Order shall authenticate and make available for delivery such Securities as provided in this Indenture and not otherwise. 
 Each Security shall be dated the date of its authentication. 
 No Security shall be entitled to any benefit under this Indenture or be valid or obligatory for any purpose unless there appears on such Security a certificate of authentication substantially in the form provided for
herein executed by the Trustee by manual signature of an authorized signatory, and such certificate upon any Security shall be conclusive evidence, and the only evidence, that such Security has been duly authenticated and delivered hereunder.

 SECTION 2.5 Global Securities. 
 Each Global Security authenticated under this Indenture shall be registered in the name of the Depositary designated by the Company for such Global Security or a nominee thereof and delivered to such Depositary or a
nominee thereof or custodian therefor, and each such Global Security shall constitute a single Security for all purposes of this Indenture. 
 Notwithstanding any other provision in this Indenture, no Global Security may be exchanged in whole or in part for Securities registered, and no transfer of a Global Security in whole or in part may be registered, in the name of any Person
other than the Depositary for such Global Security or a nominee thereof unless (A) such Depositary (i) has notified the Company that it is unwilling or unable to continue as Depositary for such Global Security or (ii) has ceased to be
a clearing agency registered as such under the Exchange Act or announces an intention permanently to cease business or does in fact do so or (B) there shall have occurred and be continuing an Event of Default with respect to such Global
Security. 
  

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 If any Global Security is to be exchanged for other Securities or cancelled in whole, it shall be
surrendered by or on behalf of the Depositary or its nominee to the Trustee, as Security Registrar, for exchange or cancellation, as provided in this Article II. If any Global Security is to be exchanged for other Securities or cancelled
in part, or if another Security is to be exchanged in whole or in part for a beneficial interest in any Global Security, in each case, as provided in Section 2.6, then either (A) such Global Security shall be so surrendered for
exchange or cancellation, as provided in this Article II, or (B) the principal amount thereof shall be reduced or increased by an amount equal to the portion thereof to be so exchanged or cancelled or equal to the principal amount of such
other Security to be so exchanged for a beneficial interest therein, as the case may be, by means of an appropriate adjustment made on the records of the Trustee, as Security Registrar, whereupon the Trustee, in accordance with the Applicable
Procedures, shall instruct the Depositary or its authorized representative to make a corresponding adjustment to its records. Upon any such surrender or adjustment of a Global Security, the Trustee shall, subject to Section 2.6(c) and as
otherwise provided in this Article II, authenticate and make available for delivery any Securities issuable in exchange for such Global Security (or any portion thereof) to or upon the order of, and registered in such names as may be directed
by, the Depositary or its authorized representative. Upon the request of the Trustee in connection with the occurrence of any of the events specified in the preceding paragraph, the Company shall promptly make available to the Trustee a reasonable
supply of Securities that are not in the form of Global Securities. The Trustee shall be entitled to rely upon any order, direction or request of the Depositary or its authorized representative which is given or made pursuant to this
Article II. 
 Every Security authenticated and delivered upon registration of transfer of, or in exchange for or in lieu of, a Global
Security or any portion thereof, whether pursuant to this Article II or otherwise, shall be authenticated and delivered in the form of, and shall be, a registered Global Security, unless such Security is registered in the name of a
Person other than the Depositary for such Global Security or a nominee thereof, in which case such Registered Security shall be authenticated and delivered in definitive, fully registered form, without interest coupons. 
 The Depositary or its nominee, as registered owner of a Global Security, shall be the Holder of such Global Security for all purposes under the Indenture
and the Registered Securities, and owners of beneficial interests in a Global Security shall hold such interests pursuant to the Applicable Procedures. Accordingly, any such owner’s beneficial interest in a Global Security shall be shown only
on, and the transfer of such interest shall be effected only through, records maintained by the Depositary or its nominee or its Agent Members, and such owners of beneficial interests in a Global Security shall not be considered the owners or
holders thereof. 
 SECTION 2.6 Registration, Registration of Transfer and Exchange. 
 (a) The Company shall cause to be kept at the Corporate Trust Office a register (the register maintained in such office and in any other office or agency
of the Company designated pursuant to Section 8.2 being herein sometimes collectively referred to as the “Security Register”) in which, subject to such reasonable regulations as it may prescribe, the Company shall
provide for the registration of Registered Securities and of transfers of Registered Securities. The Trustee is hereby appointed “Security Registrar” for the purpose of registering Registered Securities and transfers and
exchanges of Registered Securities as herein provided. 
  

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 Upon surrender for registration of transfer of any Security at an office or agency of the Company
designated pursuant to Section 8.2 for such purpose, the Company shall execute, and the Trustee shall authenticate and deliver, in the name of the designated transferee or transferees, one or more new Securities of any authorized
denominations and of a like aggregate principal amount and bearing such restrictive legends as may be required by this Indenture. 
 At the
option of the Holder, and subject to the other provisions of this Section 2.6, Securities may be exchanged for other Securities of any authorized denomination and of a like aggregate principal amount, upon surrender of the Securities to
be exchanged at any such office or agency. Whenever any Securities are so surrendered for exchange, and subject to the other provisions of this Section 2.6, the Company shall execute, and the Trustee shall authenticate and make available
for delivery, the Securities the Holder making the exchange is entitled to receive. Every Security presented or surrendered for registration of transfer or for exchange shall (if so required by the Company or the Security Registrar) be duly
endorsed, or be accompanied by a written instrument of transfer in form satisfactory to the Company and the Security Registrar, duly executed by the Holder thereof or his attorney duly authorized in writing. 
 All Securities issued upon any registration of transfer or exchange of Securities shall be the valid obligations of the Company, evidencing the same
debt, subject to the other provisions of this Section 2.6, and entitled to the same benefits under this Indenture, as the Securities surrendered upon such registration of transfer or exchange. 
 No service charge shall be made to a Holder for any registration of transfer or exchange of Securities except as provided in Section 2.7, but
the Company may require payment of a sum sufficient to cover any tax or other governmental charge that may be imposed in connection with any registration of transfer or exchange of Securities, other than exchanges pursuant to
Section 2.5, 7.5, 10.2 or 12.2(e) (other than where the shares of Common Stock are to be issued or delivered in a name other than that of the Holder of the Security) not involving any transfer and other than any
stamp and other duties, if any, that may be imposed in connection with any such transfer or exchange by the United States or any political subdivision thereof or therein, which shall be paid by the Company. 
 (b) Neither the Trustee, the Paying Agent nor any of their agents shall (1) have any duty to monitor compliance with or with respect to any federal
or state or other securities or tax laws or (2) have any duty to obtain documentation on any transfers or exchanges other than as specifically required hereunder. 
 SECTION 2.7 Mutilated, Destroyed, Lost or Stolen Securities. 
 If any mutilated Security is
surrendered to the Trustee, the Company shall execute and the Trustee shall authenticate and make available for delivery in exchange therefor a new Security of like tenor and principal amount and bearing a number not contemporaneously outstanding.

 If there be delivered to the Company and to the Trustee: 
 (a) evidence to their satisfaction of the destruction, loss or theft of any Security, and 
  

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 (b) such security or indemnity as may be satisfactory to the Company and the Trustee to save each of them
and any agent of either of them harmless, 
 then, in the absence of actual notice to the Company or the Trustee that such Security has been acquired by a
bona fide purchaser, the Company shall execute and the Trustee shall authenticate and make available for delivery, in lieu of any such destroyed, lost or stolen Security, a new Security of like tenor and principal amount and bearing a number not
contemporaneously outstanding. 
 In case any such mutilated, destroyed, lost or stolen Security has become or is about to become due and
payable, the Company in its discretion, but subject to any conversion rights, may, instead of issuing a new Security, pay such Security, upon satisfaction of the conditions set forth in the preceding paragraph. 
 Upon the issuance of any new Security under this Section 2.7, 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 (other than any stamp and other duties, if any, that may be imposed in connection therewith by the United States or any political subdivision thereof or therein, which shall be paid
by the Company) and any other expenses (including the fees and expenses of the Trustee) connected therewith. 
 Every new Security issued
pursuant to this Section 2.7 in lieu of any mutilated, destroyed, lost or stolen Security shall constitute an original additional contractual obligation of the Company, whether or not the mutilated, destroyed, lost or stolen Security
shall be at any time enforceable by anyone, and such new Security shall be entitled to all the benefits of this Indenture equally and proportionately with any and all other Securities duly issued hereunder. 
 The provisions of this Section 2.7 are exclusive and shall preclude (to the extent lawful) all other rights and remedies of any Holder with
respect to the replacement or payment of mutilated, destroyed, lost or stolen Securities. 
 SECTION 2.8 Payment of Interest; Interest
Rights Preserved. 
 Interest on any Security that is payable, and is punctually paid or duly provided for, on any Interest Payment
Date shall be paid in immediately available funds. 
 Any interest on any Security that is payable, but is not punctually paid or duly
provided for, on any Interest Payment Date (“Defaulted Interest”) shall forthwith cease to be payable to the Holder on the relevant Regular Record Date by virtue of having been such Holder, and such Defaulted Interest may be
paid by the Company, at its election in each case, as provided in clause (a) or (b) below: 
 (a) The Company may elect to make
payment of any Defaulted Interest to the Persons in whose names the 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 Security, the date of the proposed payment and the Special Record Date, 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 

  

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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 provided in this clause. The Special Record Date for the payment of such Defaulted Interest shall be not more than fifteen (15) days and not less than ten (10) days
prior to the date of the proposed payment and not less than fifteen (15) days after the receipt by the Trustee of the notice of the proposed payment. The Trustee, 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 Holder at such Holder’s address as it appears in the Security Register, not less than ten (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 so mailed, such Defaulted Interest shall be paid to the Persons in whose names the Securities (or their respective
Predecessor Securities) are registered at the close of business on such Special Record Date and shall no longer be payable pursuant to the following clause (b). 
 (b) The Company may make payment of any Defaulted Interest in any other lawful manner not inconsistent with the requirements of any securities exchange on which the Securities may be listed, and upon such notice as
may be required by such exchange, if, after notice given by the Company to the Trustee of the proposed payment pursuant to this clause, such manner of payment shall be deemed practicable by the Trustee. 
 Subject to the foregoing provisions of this Section 2.8 and Section 2.6, each Security delivered under this Indenture upon
registration of transfer of or in exchange for or in lieu of any other Security shall carry the rights to interest accrued and unpaid, and to accrue, that were carried by such other Security. 
 Interest on any Security that is converted in accordance with Section 10.2 during a Record Date Period shall be payable in accordance with
the provisions of Section 10.2. 
 SECTION 2.9 Persons Deemed Owners. 
 Prior to due presentment of a Security for registration of transfer, the Company, the Trustee and any agent of the Company or the Trustee may treat the
Person in whose name such Security is registered as the owner of such Security for the purpose of receiving payment of principal of, premium, if any, and (subject to Section 2.8) interest on such Security and for all other purposes
whatsoever, whether or not such Security be overdue, and neither the Company, the Trustee nor any agent of the Company or the Trustee shall be affected by notice to the contrary. 
 SECTION 2.10 Cancellation. 
 All Securities surrendered for payment, repurchase, registration of transfer or exchange or conversion shall, if surrendered to any Person other than the Trustee, be delivered to the Trustee. All Securities so delivered to the Trustee shall
be cancelled promptly by the Trustee. No Securities shall be authenticated in lieu of or in exchange for any Securities cancelled as provided in this Section 2.10. The Trustee shall dispose of all cancelled Securities in accordance with
applicable law and its customary practices in effect from time to time. 
  

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 SECTION 2.11 Computation of Interest. 
 Interest on the Securities shall be computed on the basis of a 360-day year of twelve (12) 30-day months. 
 SECTION 2.12 CUSIP Numbers. 
 The Company in issuing Securities shall obtain and use “CUSIP” numbers (if then generally in use) in addition to serial numbers and the Trustee shall use such CUSIP numbers in addition to serial numbers in notices of repurchase as
a convenience to Holders; provided, however, that any such notice may state that no representation is made as to the correctness of such CUSIP numbers either as printed on the Securities or as contained in any notice of a repurchase and that
reliance may be placed only on the serial or other identification numbers printed on the Securities, and any such repurchase shall not be affected by any defect in or omission of such CUSIP numbers. The Company shall promptly notify the Trustee in
writing of any change in any such CUSIP number. 
 ARTICLE III 
 SATISFACTION AND DISCHARGE 
 SECTION 3.1 Satisfaction and Discharge of
Indenture. 
 This Indenture shall upon Company Request cease to be of further effect (except as to any surviving rights of
conversion, or registration of transfer or exchange, or replacement of Securities herein expressly provided for and the Company’s obligations to the Trustee pursuant to Section 5.7), and the Trustee, at the expense of the Company,
shall execute proper instruments in form and substance satisfactory to the Trustee acknowledging satisfaction and discharge of this Indenture, when: 
 (a) either: 
 (1) all Securities theretofore authenticated and delivered (other than
(A) Securities that have been destroyed, lost or stolen and that have been replaced or paid as provided in Section 2.7 and (B) Securities for whose payment money has theretofore been deposited in trust or segregated and held in
trust by the Company and thereafter repaid to the Company or discharged from such trust, as provided in Section 8.3) have been delivered to the Trustee for cancellation; or 
 (2) all such Securities not theretofore delivered to the Trustee or its agent for cancellation (other than Securities referred to in
clauses (A) and (B) of clause (a)(1) above): 
 (i) have become due and payable; or 
 (ii) will have become due and payable at their Stated Maturity within one (1) year; 
 and the Company, in the case of clause (i) or (ii) above, has deposited or caused to be deposited with the Trustee as trust funds (immediately available to the
Holders in the case of clause (i) above) an amount sufficient to pay and discharge the entire principal, premium, if any, and interest on such Securities not theretofore delivered to the Trustee for cancellation, to the date of such deposit (in
the case of Securities that have become due and payable) or to the Stated Maturity; and 
  

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

 (c) the Company has delivered to the Trustee an Officers’ Certificate stating that all conditions precedent herein provided for
relating to the satisfaction and discharge of this Indenture have been complied with. 
 Notwithstanding the satisfaction and discharge of
this Indenture, the obligations of the Company to the Trustee under Section 5.7, the obligations of the Company to any Authenticating Agent under Section 5.12, the obligations of the Trustee under Section 3.2 and
the last paragraph of Section 8.3, if money shall have been deposited with the Trustee pursuant to clause (a)(2) of this Section 3.1, the obligations of the Company and the Trustee and the rights of the Holders under
Article IV and the obligations of the Company and the Trustee under Section 2.6 and Article X shall survive. Funds held in trust pursuant to this Section 3.1 are not subject to the provisions of
Article XI. 
 SECTION 3.2 Application of Trust Money. 
 Subject to the provisions of the last paragraph of Section 8.3, all money deposited with the Trustee pursuant to Section 3.1 shall
be held in trust and applied by it, in accordance with the provisions of the Securities and this Indenture, to the payment, either directly or through any Paying Agent (including the Company acting as its own Paying Agent), to the Persons entitled
thereto, of the principal, premium, if any, interest and Make-Whole Payment, if any, for whose payment such money has been deposited with the Trustee. 
 All moneys deposited with the Trustee pursuant to Section 3.1 (and held by it or any Paying Agent) for the payment of Securities subsequently converted shall be returned to the Company upon Company
Request. 
 ARTICLE IV 
 REMEDIES 
 SECTION 4.1 Events of Default. 
 “Event of Default,” wherever used herein, means any one of the following events (whatever the reason for such Event of Default and
whether it shall be occasioned by the provisions of Article XI or be voluntary or involuntary or be effected by operation of law or pursuant to any judgment, decree or order of any court or any order, rule or regulation of any
administrative or governmental body): 
 (a) default in the payment of the principal of or premium, if any, on any Security at its Maturity;
or 
  

 26 

 (b) default in the payment of any interest if any, upon any Security when it becomes due and payable, or
in the payment of the Make-Whole Amount when due, and continuance of such default for a period of thirty (30) days; 
 (c) failure by
the Company to give the Company Notice in accordance with Section 12.2; or 
 (d) default in the performance, or breach, of any
covenant of the Company or any Subsidiary in this Indenture (other than a covenant of default in the performance or breach of which is specifically dealt with elsewhere in this Section 4.1), and continuance of such default or breach for
a period of thirty (30) days after there has been given, by registered or certified mail, to the Company by the Trustee or to the Company and the Trustee by the Holders of at least $1,000,000 in aggregate principal amount of the Outstanding
Securities, a written notice specifying such default or breach and requiring it to be remedied and stating that such notice is a “Notice of Default” hereunder; or 
 (e) default in the payment when due of the principal of any indebtedness under any bond, debenture, note or other evidence of indebtedness for money
borrowed by the Company or any Significant Subsidiary in excess of U.S. $10,000,000, whether such indebtedness now exists or shall hereafter be created, if the indebtedness is not discharged and such default continues for a period of thirty
(30) days or more, or if such indebtedness has been accelerated, such acceleration is not annulled, within a period of thirty (30) days after there shall have been given, by registered or certified mail, to the Company by the Trustee or to
the Company and the Trustee by the Holders of at least $1,000,000 in aggregate principal amount of the Outstanding Securities a written notice specifying such default and requiring the Company to cause such indebtedness to be discharged or such
acceleration to be rescinded or annulled and stating that such notice is a “Notice of Default” hereunder; 
 (f) the entry by a
court having jurisdiction in the premises of (1) a decree or order for relief in respect of the Company or any Significant Subsidiary in an involuntary case or proceeding under any applicable federal or state bankruptcy, insolvency,
reorganization or other similar law or (2) a decree or order adjudging the Company or any Significant Subsidiary a bankrupt or insolvent, or approving as properly filed a petition seeking reorganization, arrangement, adjustment or composition
of or in respect of the Company or any Significant Subsidiary under any applicable federal or state law, or appointing a custodian, receiver, liquidator, assignee, trustee, sequestrator or other similar official of the Company or any Significant
Subsidiary or of any substantial part of its property, or ordering the winding up or liquidation of its affairs, and the continuance of any such decree or order for relief or any such other decree or order unstayed and in effect for a period of
sixty (60) consecutive days; or 
 (g) the commencement by the Company or any Significant Subsidiary of a voluntary case or proceeding
under any applicable federal or state bankruptcy, insolvency, reorganization or other similar law or of any other case or proceeding to be adjudicated a bankrupt or insolvent, or the consent by it to the entry of a decree or order for relief in
respect of the Company or any Significant Subsidiary in an involuntary case or proceeding under any applicable federal or state bankruptcy, insolvency, reorganization or other similar law or to the commencement of any bankruptcy or insolvency case
or proceeding against it, or the filing by it of a petition or answer or consent seeking 

  

 27 

 
reorganization or similar relief under any applicable federal or state law, or the consent by it to the filing of such petition or to the appointment of or
taking possession by a custodian, receiver, liquidator, assignee, trustee, sequestrator or other similar official of the Company or any Significant Subsidiary or of any substantial part of its property, or the making by it of an assignment for the
benefit of creditors, or the admission by it in writing of its inability to pay its debts generally as they become due, or the taking of corporate action by the Company or any Significant Subsidiary in furtherance of any such action. 
 SECTION 4.2 Acceleration of Maturity; Rescission and Annulment. 
 If an Event of Default (other than an Event of Default specified in Section 4.1(f) or 4.1(g) with respect to the Company) occurs and is
continuing, then in every such case the Trustee or each Holder of not less than $1,000,000 in aggregate principal amount of the Outstanding Securities may declare the principal of all the Securities to be due and payable immediately, by a notice in
writing to the Company (and to the Trustee if given by the Holders), and upon any such declaration, such principal and all accrued and unpaid interest thereon shall become immediately due and payable. If an Event of Default specified in
Section 4.1(f) or 4.1(g) with respect to the Company occurs, the principal of, and accrued and unpaid interest on, all the Securities shall ipso facto become immediately due and payable without any declaration or other Act
of the Holder or any act on the part of the Trustee. 
 If an Event of Default occurs, the outstanding Securities shall bear interest from
the date of the event that creates the Event of Default until such Event of Default is cured at the rate of twenty-one percent (21%) per annum, regardless of when or whether the Holders deliver a Notice of Default or any Holder or the Trustee
declares the outstanding principal balance due and payable as provided in this Section 4.2. 
 At any time after such declaration
of acceleration has been made and before a judgment or decree for payment of the money due has been obtained by the Trustee as hereinafter in this Article IV provided, the Holders of a majority in principal amount of the Outstanding
Securities, by written notice to the Company and the Trustee, may rescind and annul such declaration of acceleration and its consequences if: 
 (a) the Company has paid or deposited with the Trustee a sum sufficient to pay: 
 (1) all overdue interest, if any,
on all Securities; 
 (2) the principal of and premium, if any, on any Securities that have become due otherwise than by such
declaration of acceleration and any interest thereon at the rate borne by the Securities; 
 (3) to the extent permitted by
applicable law, interest upon overdue interest at the rate then in effect; and 
 (4) all sums paid or advanced by the Trustee
hereunder and the reasonable compensation, expenses, disbursements and advances of the Trustee, its agents and its counsel; and 
  

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 (b) all Events of Default (other than the non-payment of the principal of, and any premium and interest
on Securities that have become due solely by such declaration of acceleration) have been cured or waived as provided in Section 4.13. 
 No rescission or annulment referred to above shall affect any subsequent default or impair any right consequent thereon. 
 SECTION 4.3 Collection of Indebtedness and Suits for Enforcement by Trustee. 
 The Company covenants that if:

 (a) default is made in the payment of any interest on any Security when it becomes due and payable and such default continues for a period
of thirty (30) days; or 
 (b) default is made in the payment of the principal of or premium, if any, on any Security at the Maturity
thereof; 
 the Company will upon demand by the Trustee, pay to the Trustee, for the benefit of the Holders of such Securities, the whole amount then due and
payable on such Securities for principal, premium, if any, and interest on any overdue principal, premium, if any, and, to the extent permitted by applicable law, on any overdue interest at the rate then in effect, and in addition thereto, such
further amount as shall be sufficient to cover the reasonable costs and expenses of collection, including the reasonable compensation, expenses, disbursements and advances of the Trustee, its agents and its counsel. 
 If the Company fails to pay such amounts forthwith upon such demand, the Trustee, in its own name and as trustee of an express trust, may institute a
judicial proceeding for the collection of the sums so due and unpaid, may prosecute such proceeding to judgment or final decree and may enforce the same against the Company or any other obligor upon the Securities and collect the moneys adjudged or
decreed to be payable in the manner provided by law out of the property of the Company or any other obligor upon the Securities, wherever situated. 
 If an Event of Default occurs and is continuing, the Trustee may in its discretion proceed to protect and enforce its rights and the rights of the Holders of Securities by such appropriate judicial proceedings as the Trustee shall deem most
effective to protect and enforce any such rights, whether for the specific enforcement of any covenant or agreement in this Indenture or in aid of the exercise of any power granted herein, or to enforce any other proper remedy. 
 SECTION 4.4 Trustee May File Proofs of Claim. 
 In case of the pendency of any receivership, insolvency, liquidation, bankruptcy, reorganization, arrangement, adjustment, composition or other judicial proceeding relating to the Company or any other obligor upon the
Securities or the property of the Company or of such other obligor or the creditors of either, the Trustee (whether or not the principal of, and any interest on, the Securities shall then be due and payable as therein expressed or by declaration or
otherwise and whether or not the Trustee shall have made any demand on the Company for the payment of overdue principal or interest) shall be entitled and empowered, by intervention in such proceeding or otherwise: 
 (a) to file and prove a claim for the whole amount of principal, premium, if any, or interest owing and unpaid in respect of the Securities and take such
other actions, including participating as a member, voting or otherwise, of any official committee of creditors appointed in such matter, and to file such other papers or documents, in each of the foregoing cases, as may be necessary or advisable in
order to have the claims of the Trustee (including any claim for the reasonable compensation, expenses, disbursements and advances of the Trustee, its agents and its counsel) and of the Holders of Securities allowed in such judicial proceeding; and

  

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 (b) to collect and receive any moneys or other property payable or deliverable on any such claim and to
distribute the same; and any custodian, receiver, assignee, trustee, liquidator, sequestrator or other similar official in any such judicial proceeding is hereby authorized by each Holder of Securities to make such payments to the Trustee and, in
the event that the Trustee shall consent to the making of such payments directly to the Holders of Securities, to pay to the Trustee any amount due to it for the reasonable compensation, expenses, disbursements and advances of the Trustee, its
agents and its counsel and any other amounts due the Trustee under Section 5.7. 
 Nothing herein contained shall be deemed to
authorize the Trustee to authorize or consent to or accept or adopt on behalf of any Holder of a Security any plan of reorganization, arrangement, adjustment or composition affecting the Securities or the rights of any Holder thereof or to authorize
the Trustee to vote in respect of the claim of any Holder of a Security in any such proceeding; provided, however, that the Trustee may, on behalf of such Holders, vote for the election of a trustee in bankruptcy or similar official.

 SECTION 4.5 Trustee May Enforce Claims without Possession of Securities. 
 All rights of action and claims under this Indenture or the Securities may be prosecuted and enforced by the Trustee without the possession of any of the
Securities or the production thereof in any proceeding relating thereto, and any such proceeding instituted by the Trustee shall be brought in its own name as trustee of an express trust, and any recovery of judgment shall, after provision for the
payment of the reasonable compensation, expenses, disbursements and advances of the Trustee, its agents and its counsel, be for the ratable benefit of the Holders of the Securities in respect of which judgment has been recovered. 
 SECTION 4.6 Application of Money Collected. 
 Subject to Article XI, any money collected by the Trustee pursuant to this Article IV shall be applied in the following order, at the date or dates fixed by the Trustee and, in case of the
distribution of such money on account of principal, premium, if any, or interest, upon presentation of the Securities and the notation thereon of the payment if only partially paid and upon surrender thereof if fully paid: 
 FIRST: to the payment of all amounts due the Trustee under Section 5.7; 
 SECOND: to the payment of the amounts then due and unpaid for principal of, premium, if any, or interest on, the Securities in respect of which or for
the benefit of which such money has been collected, ratably, without preference or priority of any kind, according to the amounts due and payable on such Securities for principal, premium, if any, and interest, respectively; and 
  

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 THIRD: any remaining amounts shall be repaid to the Company. 
 SECTION 4.7 Limitation on Suits. 
 No Holder of any Security shall have any right to institute any proceeding, judicial or the like, with respect to this Indenture, or for the appointment of a receiver or trustee, or for any other remedy hereunder, unless: 
 (a) such Holder has previously given written notice to the Trustee of a continuing Event of Default; 
 (b) the Holders of not less than $1,000,000 in aggregate principal amount of the Outstanding Securities shall have made written request to the Trustee to
institute proceedings in respect of such Event of Default in its own name as Trustee hereunder; 
 (c) such Holder or Holders have furnished
to the Trustee reasonable indemnity against the costs, expenses and liabilities to be incurred in compliance with such request; 
 (d) the
Trustee for thirty (30) days after its receipt of such notice, request and offer of indemnity, has failed to institute any such proceeding; and 
 (e) the Trustee has not received any direction inconsistent with such written request from the Holders of a majority of the aggregate principal amount of the Outstanding Securities during the 30-day period referred to
in (d) above; 
 it being understood and intended that no one or more of such Holders shall have any right in any manner whatever by virtue of, or by
availing of, any provision of this Indenture to affect, disturb or prejudice the rights of any other of such Holders, or to obtain or seek to obtain priority or preference over any other of such Holders or to enforce any right under this Indenture,
except in the manner herein provided and for the equal and ratable benefit of all such Holders. 
 SECTION 4.8 Unconditional Right of
Holders to Receive Principal, Premium and Interest and to Convert. 
 Notwithstanding any other provision in this Indenture, the
Holder of any Security shall have the right, which is absolute and unconditional, to receive payment of the principal of, premium, if any, and (subject to Section 2.8) interest on such Security on the respective Stated Maturities
expressed in such Security (or, in the case of repurchase, on the Repurchase Date), and to convert such Security in accordance with Article X, and to institute suit for the enforcement of any such payment and right to convert, and such
rights shall not be impaired without the consent of such Holder. 
 SECTION 4.9 Restoration of Rights and Remedies. 

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

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 SECTION 4.10 Rights and Remedies Cumulative. 
 Except as otherwise provided with respect to the replacement or payment of mutilated, destroyed, lost or stolen Securities in the last paragraph of
Section 2.7, no right or remedy herein conferred upon or reserved to the Trustee or to the Holders of Securities is intended to be exclusive of any other right or remedy, and every right and remedy shall, to the extent permitted by law,
be cumulative and in addition to every other right and remedy given hereunder or now or hereafter existing at law or in equity or otherwise. The assertion or employment of any right or remedy hereunder, or otherwise, shall not prevent the concurrent
assertion or employment of any other appropriate right or remedy. 
 SECTION 4.11 Delay or Omission Not Waiver. 
 No delay or omission of the Trustee or of any Holder of any Security to exercise any right or remedy accruing upon any Event of Default shall impair any
such right or remedy or constitute a waiver of any such Event of Default or any acquiescence therein. Every right and remedy given by this Article IV or by law to the Trustee or to the Holders of Securities may be exercised from time to
time, and as often as may be deemed expedient, by the Trustee or (subject to the limitations contained in this Indenture) by the Holders of Securities, as the case may be. 
 SECTION 4.12 Control by Holders of Securities. 
 The Holders of a majority in principal amount of the Outstanding Securities 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, provided that: 
 (a) such direction shall not be in conflict with any rule of law or with this
Indenture; and 
 (b) the Trustee may take any other action deemed proper by the Trustee that is not inconsistent with such direction.

 SECTION 4.13 Waiver of Past Defaults. 
 The Holders, either (a) through the written consent of not less than a majority in principal amount of the Outstanding Securities or (b) by the adoption of a resolution, at a meeting of Holders of the
Outstanding Securities at which a quorum is present, by the Holders of at least a majority in principal amount of the Outstanding Securities represented at such meeting, may on behalf of the Holders of all the Securities waive any past default
hereunder and its consequences, except a default (1) in the payment of the principal of, premium, if any, interest or the Repurchase Price on any Security or (2) in respect of a covenant or provision hereof that under
Article VII cannot be modified or amended without the consent of the Holder of each Outstanding Security affected. 
  

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 Upon any such waiver, such default shall cease to exist, and any Event of Default arising therefrom shall
be deemed to have been cured, for every purpose of this Indenture; but no such waiver shall extend to any subsequent or other default or impair any right consequent thereon. 
 SECTION 4.14 Undertaking for Costs. 
 All parties to this Indenture agree, and each Holder of any Security by his acceptance thereof shall be deemed to have agreed, that any court may in its discretion require, in any suit for the enforcement of any right or remedy under this
Indenture, or in any suit against the Trustee for any action taken, suffered or omitted by it as Trustee, the filing by any party litigant in such suit of an undertaking to pay the costs of such suit, and that such court may in its discretion assess
reasonable costs, including reasonable attorneys’ fees and expenses, against any party litigant in such suit, having due regard to the merits and good faith of the claims or defenses made by such party litigant; but the provisions of this
Section 4.14 shall not apply to any suit instituted by the Company, to any suit instituted by the Trustee, to any suit instituted by any Holder, or group of Holders, holding in the aggregate more than ten percent (10%) in principal
amount of the Outstanding Securities, or to any suit instituted by any Holder of any Security for the enforcement of the payment of the principal of, premium, if any, or interest on any Security on or after the respective Stated Maturity or
Maturities expressed in such Security (or, in the case of repurchase, on or after the Repurchase Date) or for the enforcement of the right to convert any Security in accordance with Article X. 
 SECTION 4.15 Waiver of Stay, Usury or Extension Laws. 
 The Company covenants (to the extent that it may lawfully do so) that it will not at any time insist upon, or plead, or in any manner whatsoever claim or take the benefit or advantage of, any stay, usury or extension
law wherever enacted, now or at any time hereafter in force, that may affect the covenants or the performance of this Indenture; and the Company (to the extent that it may lawfully do so) hereby expressly waives all benefit or advantage of any such
law and covenants that it will not hinder, delay or impede by reason of such law the execution of any power herein granted to the Trustee but will suffer and permit the execution of every such power as though no such law had been enacted.

 ARTICLE V 
 THE
TRUSTEE 
 SECTION 5.1 Certain Duties and Responsibilities. 
 (a) Except during the continuance of an Event of Default: 
 (1) the Trustee undertakes to perform such duties and only such duties as are specifically set forth in this Indenture, and no implied covenants or obligations shall be read into this Indenture against the Trustee;
and 
 (2) in the absence of bad faith on its part, the Trustee may conclusively rely, as to the truth of the statements and
the correctness of the opinions expressed therein, upon certificates or opinions furnished to the Trustee and conforming to the requirements of this Indenture; but in the case of any such certificates or opinions 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 but not to verify the contents thereof. 
  

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 (b) In case an Event of Default has occurred and is continuing, the Trustee shall exercise such of the
rights and powers vested in it by this Indenture, and use the same degree of care and skill in their exercise, as a prudent man would exercise or use under the circumstances in the conduct of his own affairs. 
 (c) No provision of this Indenture shall be construed to relieve the Trustee from liability for its own negligent action, its own negligent failure to
act, or its own willful misconduct, except that: 
 (1) this paragraph (c) shall not be construed to limit the effect of
paragraph (a) of this Section 5.1; 
 (2) the Trustee shall not be liable for any error of judgment made in
good faith by a Responsible Officer, unless it shall be proved that the Trustee was negligent in ascertaining the pertinent facts; 
 (3) the Trustee shall not be liable with respect to any action taken or omitted to be taken by it in good faith in accordance with the direction of the Holders of a majority in principal amount of the Outstanding Securities 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; and 
 (4) no provision of this Indenture shall require the Trustee to expend or risk its own funds or otherwise incur any financial liability in
the performance of any of its duties hereunder, or in the exercise of any of its rights or powers, if it shall have reasonable grounds for believing that repayment of such funds or adequate indemnity against such risk or liability is not reasonably
assured to it. 
 (d) Whether or not therein expressly so provided, every provision of this Indenture relating to the conduct or affecting
the liability of or affording protection to the Trustee shall be subject to the provisions of this Section 5.1. 
 SECTION 5.2
Notice of Defaults. 
 Within thirty (30) days after the occurrence of any default hereunder as to which a Responsible Officer
of the Trustee has actually received written notice, the Trustee shall give to all Holders of Securities, in the manner provided in Section 1.6, notice of such default, unless such default shall have been cured or waived; provided,
however, that, except in the case of a default in the payment of the principal of, premium, if any, or interest on any Security, the Trustee shall be protected in withholding such notice if and so long as the board of directors, the executive
committee or a trust committee of directors or Responsible Officers of the Trustee in good faith determines that the withholding of such notice is in the interest of the Holders. For the purpose of this Section 5.2, the term
“default” means any event that is, or after notice or lapse of time or both would become, an Event of Default. 
  

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 SECTION 5.3 Certain Rights of Trustee. 
 Subject to the provisions of Section 5.1: 
 (a) the Trustee may rely and shall be protected in acting or refraining from acting upon any resolution, Officers’ Certificate, other certificate, statement, instrument, opinion, report, notice, request,
direction, consent, order, bond, debenture, note, coupon, other evidence of Indebtedness 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 or direction of the Company mentioned herein shall be sufficiently evidenced by a Company Request or Company Order and any resolution of
the Board of Directors shall be sufficiently evidenced by a Board Resolution; 
 (c) whenever in the administration of this Indenture the
Trustee shall deem it desirable that a matter be proved or established prior to taking, suffering or omitting any action hereunder, the Trustee (unless other evidence be herein specifically prescribed) may, in the absence of bad faith on its part,
rely upon an Officers’ Certificate; 
 (d) the Trustee may consult with counsel of its selection and the advice of such counsel or any
Opinion of Counsel shall be full and complete authorization and protection in respect of any action taken, suffered or omitted by it hereunder in good faith and in reliance thereon; 
 (e) the Trustee shall be under no obligation to exercise any of the rights or powers vested in it by this Indenture at the request or direction of any of
the Holders of Securities pursuant to this Indenture, unless such Holders shall have offered to the Trustee reasonable security or indemnity against the costs, expenses and liabilities that might be incurred by it in compliance with such request or
direction; 
 (f) the Trustee shall not be bound to make any investigation into the facts or matters stated in any resolution, certificate,
statement, instrument, opinion, report, notice, request, direction, consent, order, bond, debenture, note, coupon, other evidence of Indebtedness or other paper or document, but the Trustee may make such further inquiry or investigation into such
facts or matters as it may see fit, and, if the Trustee shall determine to make such further inquiry or investigation, it shall be entitled to examine the books, records and premises of the Company, personally or by agent or attorney; and

 (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. 
 SECTION 5.4 Not Responsible for Recitals or Issuance of Securities. 
 The recitals contained
herein and in the Securities (except the Trustee’s certificates of authentication) shall be taken as the statements of the Company, and the Trustee assumes no responsibility for their correctness. The Trustee makes no representations as to the
validity or sufficiency of this Indenture, of the Securities or of the Common Stock issuable upon the conversion of the Securities. The Trustee shall not be accountable for the use or application by the Company of Securities or the proceeds thereof.

  

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 SECTION 5.5 May Hold Securities, Act as Trustee under Other Indentures. 
 The Trustee, any Authenticating Agent, any Paying Agent, any Conversion Agent or any other agent of the Company or the Trustee, in its individual or any
other capacity, may become the owner or pledgee of Securities and may otherwise deal with the Company with the same rights it would have if it were not Trustee, Authenticating Agent, Paying Agent, Conversion Agent or such other agent. 
 The Trustee may become and act as trustee under other indentures under which other securities, or certificates of interest or participation in other
securities, of the Company are outstanding in the same manner as if it were not Trustee hereunder. 
 SECTION 5.6 Money Held in
Trust. 
 Money held by the Trustee in trust hereunder need not be segregated from other funds except to the extent required by law.
The Trustee shall be under no liability for interest on any money received by it hereunder, except as otherwise agreed in writing with the Company. 
 SECTION 5.7 Compensation and Reimbursement. 
 The Company agrees: 
 (a) to pay to the Trustee from time to time such reasonable compensation as the Company and the Trustee shall from time to time agree in writing for all
services rendered by it hereunder (which compensation shall not be limited by any provision of law in regard to the compensation of a trustee of an express trust); 
 (b) to reimburse the Trustee upon its request for all reasonable expenses, disbursements and advances incurred or made by the Trustee in accordance with any provision of this Indenture (including the reasonable
compensation and the expenses and disbursements of its agents and counsel), except any such expense, disbursement or advance as may be attributable to its negligence or bad faith; and 
 (c) to indemnify the Trustee (and its directors, officers, employees and agents) for, and to hold it harmless against, any and all loss, damage, claim,
liability or expense, including taxes (other than taxes based on the income of the Trustee), incurred without negligence, bad faith or willful misconduct on its part, arising out of or in connection with the acceptance or administration of this
trust, including the reasonable costs, expenses and reasonable attorneys’ fees of defending itself against any claim or liability in connection with the exercise or performance of any of its powers or duties hereunder. 
 When the Trustee incurs expenses or renders services in connection with an Event of Default specified in Section 4.1(g) or
Section 4.1(h) with respect to the Company, the expenses (including the reasonable charges of its counsel) and the compensation for the services are intended to constitute expenses of the administration under any applicable federal or
state bankruptcy, insolvency or other similar law. 
  

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 The Trustee shall have a lien prior to the Securities as to all property and funds held by it hereunder
for any amount owing it or any predecessor Trustee pursuant to this Section 5.7, except with respect to funds held in trust for the benefit of the Holders of particular Securities. 
 The provisions of this Section 5.7 shall survive the termination of this Indenture or the earlier resignation or removal of the Trustee.

 SECTION 5.8 Corporate Trustee Required; Eligibility. 
 There shall at all times be a Trustee hereunder which shall be a Person that is eligible pursuant to the Trust Indenture Act to act as such, having a
combined capital and surplus (or for such purposes, the combined capital and surplus of any parent holding company) of at least U.S. $25,000,000, subject to supervision or examination by federal or state authority, in good standing and having
an established place of business or agency in the Borough of Manhattan, The City of New York. If such corporation publishes reports of condition at least annually, pursuant to law or to the requirements of said supervising or examining authority,
then for the purposes of this Section 5.8, the combined capital and surplus of such corporation shall be deemed to be its combined capital and surplus as set forth in its most recent report of condition so published. If at any time the
Trustee shall cease to be eligible in accordance with the provisions of this Section 5.8, it shall resign immediately in the manner and with the effect hereinafter specified in this Article V and a successor shall be
appointed pursuant to Section 5.9. 
 SECTION 5.9 Resignation and Removal; Appointment of Successor. 
 (a) No resignation or removal of the Trustee and no appointment of a successor Trustee pursuant to this Article V shall become effective until
the acceptance of appointment by the successor Trustee in accordance with the applicable requirements of Section 5.10. 
 (b) The
Trustee may resign at any time by giving written notice thereof to the Company. If the instrument of acceptance by a successor Trustee required by Section 5.10 shall not have been delivered to the Trustee within thirty (30) days
after the giving of such notice of resignation, the resigning Trustee or the Company may petition any court of competent jurisdiction for the appointment of a successor Trustee. 
 (c) The Trustee may be removed at any time by Act of the Holders of a majority in principal amount of the Outstanding Securities, delivered to the
Trustee and the Company. If the instrument of acceptance by a successor Trustee required by Section 5.10 shall not have been delivered to the Trustee within thirty (30) days after the giving of such notice of removal, the removed
Trustee or the Company may petition any court of competent jurisdiction for the appointment of a successor Trustee. 
 (d) If at any time:

 (1) the Trustee shall cease to be eligible under Section 5.8 and shall fail to resign after written request
therefor by the Company or by any Holder of a Security who has been a bona fide Holder of a Security for at least six (6) months; or 
  

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

then, (i) in any such case the Company may remove the Trustee, or (ii) in the case of clause (d)(1) above only and subject to Section 4.14,
any Holder of a Security who has been a bona fide Holder of a Security for at least six (6) months may, on behalf of himself and all others similarly situated, petition any court of competent jurisdiction for the removal of the Trustee
and the appointment of a successor Trustee. 
 (e) If the Trustee shall resign, be removed or become incapable of acting, or if a vacancy
shall occur in the office of Trustee for any cause, the Company shall promptly appoint a successor Trustee and shall comply with the applicable requirements of this Section 5.9 and Section 5.10. If, within one (1) year
after such resignation, removal or incapability, or occurrence of such vacancy, a successor Trustee shall be appointed by Act of the Holders of a majority in principal amount of the Outstanding Securities delivered to the Company and the retiring
Trustee, the successor Trustee so appointed shall, forthwith upon its acceptance of such appointment in accordance with the applicable requirements of Section 5.10, become the successor Trustee and supersede the successor Trustee
appointed by the Company. If no successor Trustee shall have been so appointed by the Company or the Holders of Securities and accepted appointment in the manner required by this Section 5.9 and Section 5.10, any Holder of a
Security who has been a bona fide Holder of a Security for at least six (6) months may, on behalf of himself and all others similarly situated, petition any court of competent jurisdiction for the appointment of a successor Trustee. 

(f) The successor Trustee shall give notice of each resignation and each removal of the Trustee and each appointment of a successor Trustee to all
Holders of Securities in the manner provided in Section 1.6. Each notice shall include the name of the successor Trustee and the address of its Corporate Trust Office. 
 SECTION 5.10 Acceptance of Appointment by Successor. 
 Every successor Trustee appointed hereunder 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. Such retiring Trustee shall, upon payment of
its charges, promptly 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. 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. 
  

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 No successor Trustee shall accept its appointment unless at the time of such acceptance such successor
Trustee shall be eligible under this Article V. 
 SECTION 5.11 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 of 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 such corporation shall be otherwise eligible under this Article V), without the execution or filing of any paper or any further act on the
part of any of the parties hereto. In case any Securities shall have been authenticated, but not delivered, by the Trustee then in office, any successor by merger, conversion or consolidation to such authenticating Trustee may adopt such
authentication and deliver the Securities so authenticated with the same effect as if such successor Trustee had itself authenticated such Securities. 
 SECTION 5.12 Authenticating Agents. 
 The Trustee may, with the consent of the Company, appoint
an Authenticating Agent or Agents acceptable to the Company with respect to the Securities, which shall be authorized to act on behalf of the Trustee to authenticate Securities issued upon exchange or substitution pursuant to this Indenture.

 Securities authenticated by an Authenticating Agent 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, and every reference in this Indenture to the authentication and delivery of Securities by the Trustee or the Trustee’s certificate of authentication shall be deemed to include
authentication and delivery on behalf of the Trustee by an Authenticating Agent and a certificate of authentication executed on behalf of the Trustee by an Authenticating Agent. Each Authenticating Agent shall be subject to acceptance by the Company
and shall at all times be a corporation organized and doing business under the laws of the United States of America, any state thereof or the District of Columbia, authorized under such laws to act as Authenticating Agent and subject to supervision
or examination by government or other fiscal authority. If at any time an Authenticating Agent shall cease to be eligible in accordance with the provisions of this Section 5.12, such Authenticating Agent shall resign immediately in the
manner and with the effect specified in this Section 5.12. 
 Any corporation into which an Authenticating Agent may be merged or
converted or with which it may be consolidated, or any corporation resulting from any merger, conversion or consolidation to which such Authenticating Agent shall be a party, or any corporation succeeding to the corporate agency or corporate trust
business of an Authenticating Agent, shall continue to be an Authenticating Agent (provided such corporation shall be otherwise eligible under this Section 5.12), without the execution or filing of any paper or any further act on
the part of the Trustee or the Authenticating Agent. 
 An Authenticating Agent may resign at any time by giving written notice thereof to
the Trustee and to the Company. The Trustee may at any time terminate the agency of an Authenticating Agent by giving written notice thereof to such Authenticating Agent and to the 

  

 39 

 
Company. Upon receiving such a notice of resignation or upon such a termination, or in case at any time such Authenticating Agent shall cease to be eligible
in accordance with the provisions of this Section 5.12, the Trustee may appoint a successor Authenticating Agent, which shall be subject to acceptance by 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, with like effect as if originally named as an Authenticating Agent. No successor Authenticating Agent shall be appointed unless eligible under the
provisions of this Section 5.12. 
 The Company agrees to pay to each Authenticating Agent from time to time reasonable
compensation for its services under this Section 5.12. 
 If an Authenticating Agent is appointed with respect to the Securities
pursuant to this Section 5.12, the Securities may have endorsed thereon, in addition to or in lieu of the Trustee’s certification of authentication, an alternative certificate of authentication in the following form: 
 This is one of the Securities referred to in the within-mentioned Indenture. 
  

			
	By: U.S. BANK NATIONAL ASSOCIATION,
		
	By:	 	                , as Authenticating Agent
		
	By	 	 
		 	Authorized Signature

 SECTION 5.13 Disqualification; Conflicting Interests. 
 If the Trustee has or shall acquire a conflicting interest within the meaning of the Trust Indenture Act, the Trustee shall either eliminate such interest
or resign as Trustee hereunder, to the extent and in the manner provided by, and subject to the provisions of, the Trust Indenture Act and this Indenture. 
 SECTION 5.14 Preferential Collection of Claims Against Company. 
 If and when the Trustee shall
be or become a creditor of the Company (or any other obligor upon the Securities), the Trustee shall be subject to the provisions of the Trust Indenture Act regarding the collection of claims against the Company (or any such other obligor).

 ARTICLE VI 
 CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE 
 SECTION 6.1 Company May Consolidate, Etc., Only on Certain
Terms. 
 Without the consent or affirmative vote of the Holders of each Outstanding Security, the Company shall not consolidate with
or merge into any other Person or convey, transfer, sell or lease its properties and assets substantially as an entirety to any Person, and the Company shall not permit any Person to consolidate with or merge into it or convey, transfer, sell or
lease such Person’s properties and assets substantially as an entirety to it, unless: 
 (a) the Company is the surviving person or the
Person formed by such consolidation or into which the Company is merged, or the Person to which the Company’s properties and assets are conveyed, transferred, sold or leased, shall be (1) a corporation, limited liability company,
partnership or trust organized and validly existing under the laws of the United States of America, any state thereof or the District of Columbia or (2) organized under the laws of a jurisdiction outside the United States of America and have
common stock or American Depository Shares representing such common stock traded on a national securities exchange in the United States, including The Nasdaq Stock Market, Inc., and, in each case, if other than the Company, shall expressly assume,
by an indenture supplemental hereto, executed and delivered to the Trustee, in form satisfactory to the Trustee, the due and punctual payment of the principal of, premium, if any, and interest on all of the Securities as applicable, and the
performance or observance of every covenant of this Indenture on the part of the Company to be performed or observed; 
  

 40 

 (b) immediately after giving effect to such transaction, no Event of Default, and no event that, after
notice or lapse of time or both, would become an Event of Default, shall have occurred and be continuing; and 
 (c) the Company has
delivered to the Trustee an Officers’ Certificate and an Opinion of Counsel, each stating that such consolidation, merger, conveyance, transfer or lease and, if a supplemental indenture is required in connection with such transaction, such
supplemental indenture, comply with this Article VI and that all conditions precedent herein provided for relating to such transaction have been complied with, together with any documents required under Section 7.3.

 SECTION 6.2 Successor Substituted. 
 Upon any consolidation of the Company with, or merger of the Company into, any other Person or any conveyance, transfer of all or substantially all the assets of the Company in accordance with Section 6.1,
the successor Person formed by such consolidation or into which the Company is merged or to which such conveyance or transfer is made shall succeed to, and be substituted for, and may exercise every right and power of, the Company under this
Indenture with the same effect as if such successor Person had been named as the Company herein, and thereafter, except in the case of a lease, the predecessor Person shall be relieved of all the obligations and covenants under this Indenture and
the Securities except with respect to any obligations that arise from, or are related to, such transaction. 
 ARTICLE VII 

SUPPLEMENTAL INDENTURES 
 SECTION
7.1 Supplemental Indentures without Consent of Holders of Securities. 
 Without the consent or affirmative vote of any Holders of
Securities, the Company, when authorized by a Board Resolution, and the Trustee, at any time and from time to time, may enter into one or more indentures supplemental hereto for any of the following purposes: 
 (a) to evidence the succession of another Person to the Company and the assumption by any such successor of the covenants and obligations of the Company
herein and in the Securities as permitted by this Indenture; or 
  

 41 

 (b) to add to the covenants of the Company for the benefit of the Holders of Securities or to surrender
any right or power herein conferred upon the Company; or 
 (c) to guarantee or secure the Securities; or 
 (d) to make provision with respect to the conversion rights of Holders of Securities pursuant to Section 10.11; or 
 (e) to comply with the requirements of the Trust Indenture Act or the rules and regulations of the Commission thereunder in order to effect or maintain
the qualification of this Indenture under the Trust Indenture Act, as contemplated by this Indenture or otherwise; or 
 (f) to evidence and
provide for the acceptance of appointment hereunder by a successor Trustee; or 
 (g) to cure any ambiguity, to correct or supplement any
provision herein that may be inconsistent with any other provision herein or that is otherwise defective, or to make any other provisions with respect to matters or questions arising under this Indenture as the Company and the Trustee may deem
necessary or desirable (provided such action pursuant to this clause (h) shall not adversely affect the interests of the Holders of Securities in any material respect). 
 Upon Company Request accompanied by a Board Resolution authorizing the execution of any such supplemental indenture, and subject to and upon receipt by
the Trustee of the documents described in Section 7.3 hereof, the Trustee shall join with the Company in the execution of any supplemental indenture authorized or permitted by the terms of this Indenture and to make any further
appropriate agreements and stipulations that may be therein contained. 
 SECTION 7.2 Supplemental Indentures with Consent of Holders
of Securities. 
 With either (a) the written consent of the Holders of not less than a majority in principal amount of the
Outstanding Securities, by the Act of said Holders delivered to the Company and the Trustee, or (b) by the adoption of a resolution, at a meeting of Holders of the Outstanding Securities at which a quorum is present, by the Holders of a
majority in principal amount of the Outstanding Securities represented at such meeting, the Company, when authorized by a Board Resolution, and the Trustee may enter into an indenture or indentures supplemental hereto for the purpose of adding any
provisions to or changing in any manner or eliminating any of the provisions of this Indenture or of modifying in any manner the rights of the Holders of Securities under this Indenture; provided, however, that no such supplemental indenture shall,
without the consent or affirmative vote of the Holder of each Outstanding Security affected thereby: 
 (1) change the Stated
Maturity of the principal of, or any installment of interest on, any Security, or reduce the principal amount, any premium or the rate of interest payable thereon, or change the place at which or the coin or currency in which any Security or the
interest or any premium thereon or any other amount in respect thereof is payable; or 
 (2) impair the right to institute
suit for the enforcement of any payment in respect of any Security on or after the Stated Maturity thereof (or, in the case of any repurchase, on or after the Repurchase Date); or 
  

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 (3) except as permitted by Section 10.11, adversely affect the right to
convert any Security as provided in Article X; or 
 (4) modify the provisions of this Indenture with respect to
the ranking of the Securities in a manner adverse to the Holders of any Securities; or 
 (5) reduce the percentage in
principal amount of the Outstanding Securities the consent of whose Holders is required for any supplemental indenture to modify or amend any provision of this Indenture or the consent of whose Holders is required for any waiver (of compliance with
certain provisions of this Indenture or certain defaults hereunder and their consequences) provided for in this Indenture; or 
 (6) modify any of the provisions of this Section 7.2 except to increase any required percentage contained herein or therein or to provide that certain other provisions of this Indenture cannot be modified or waived without the
consent of the Holder of each Outstanding Security affected thereby; or 
 (7) amend or modify the provisions of
Article XII in a manner adverse to the Holders after the Holder’s right to require the Company to repurchase the Securities upon a Change in Control arises, except in accordance with the terms of this Indenture. 
 It shall not be necessary for any Act of Holders of Securities under this Section 7.2 to approve the particular form of any proposed
supplemental indenture, but it shall be sufficient if such Act shall approve the substance thereof. 
 The quorum at any meeting called to
adopt a resolution shall be Holders representing a majority in aggregate principal amount of Securities at the time Outstanding. 
 SECTION 7.3 Execution of Supplemental Indentures. 
 In executing, or accepting the additional trusts created by, any
supplemental indenture permitted by this Section VII or the modifications thereby of the trusts created by this Indenture, the Trustee shall be entitled to receive, and (subject to Sections 5.1 and 5.3) shall be fully
protected in relying upon, an Opinion of Counsel stating that the execution of such supplemental indenture is authorized or permitted by this Indenture and that such supplemental indenture has been duly authorized, executed and delivered by the
Company and constitutes a valid and legally binding obligation of the Company enforceable against the Company in accordance with its terms. The Trustee may, but 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. 
 SECTION 7.4 Effect of Supplemental
Indentures. 
 Upon the execution of any supplemental indenture under this Section VII, this Indenture shall be modified
in accordance therewith, and such supplemental indenture shall form a part of this Indenture for all purposes; and every Holder of Securities theretofore or thereafter authenticated and delivered hereunder appertaining thereto shall be bound
thereby. 
  

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 SECTION 7.5 Reference in Securities to Supplemental Indentures. 
 Securities authenticated and delivered after the execution of any supplemental indenture pursuant to this Section VII may, and shall if
required by the Trustee, bear a notation in form approved by the Trustee as to any matter provided for in such supplemental indenture. If the Company shall so determine, new Securities so modified as to conform, in the opinion of the Company and the
Trustee, to any such supplemental indenture may be prepared and executed by the Company and authenticated and delivered by the Trustee in exchange for Outstanding Securities. 
 SECTION 7.6 Notice of Supplemental Indentures. 
 Promptly after the execution by the Company and the Trustee of any supplemental indenture pursuant to the provisions of Section 7.2, the Company shall give notice to all Holders of Securities of such fact,
setting forth in general terms the substance of such supplemental indenture, in the manner provided in Section 1.6. Any failure of the Company to give such notice, or any defect therein, shall not in any way impair or affect the validity
of any such supplemental indenture. 
 ARTICLE VIII 
 COVENANTS 
 SECTION 8.1 Payment of Principal, Premium and Interest. 
 The Company covenants and agrees that it will duly and punctually pay the principal of and premium, if any, and interest on the Securities in accordance
with the terms of the Securities and this Indenture. By no later than 12:00 noon Eastern time on the date of the Stated Maturity of any Security, the Company shall deposit or cause to be deposited with the Trustee, all principal and premium payments
so due, which payments shall be in immediately available funds on the date of such Stated Maturity. By no later than 12:00 noon Eastern time on the due date for any installment of interest, the Company shall deposit or cause to be deposited with the
Trustee, all interest payments so due, which payments shall be in immediately available funds on the due date. 
 SECTION 8.2
Maintenance of Offices or Agencies. 
 The Company hereby appoints the New York City office of the Trustee as its agent in the
Borough of Manhattan, The City of New York, where Securities may be presented or surrendered for payment, where Securities may be surrendered for registration of transfer or exchange, where Securities may be surrendered for conversion, and where
notices and demands to or upon the Company in respect of the Securities and this Indenture may be served. 
 The Company may at any time and
from time to time vary or terminate the appointment of any such agent or appoint any additional agents for any or all of such purposes; provided, however, that until all of the Securities have been delivered to the Trustee for cancellation,
or moneys sufficient to pay the principal of, premium, if any, and interest on the Securities have been made available for payment and either paid or returned to the Company pursuant to the provisions of Section 8.3, the Company shall
maintain in the Borough of Manhattan, The City of New York, an office or agency where Securities may be presented or surrendered for payment and conversion, where Securities may be surrendered for registration of transfer or exchange and where
notices and demands to or upon the Company in respect of the Securities and this Indenture may be served. The Company shall give prompt written notice to the Trustee, and notice to the Holders in accordance with Section 1.6, of the
appointment or termination of any such agents and of the location and any change in the location of any such office or agency. 
  

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 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, presentations and surrenders may be made and notices and demands may be served on the Corporate Trust Office. 
 SECTION 8.3 Money for Security Payments to Be Held in Trust. 
 If the Company will act as its
own Paying Agent, it shall, on or before each due date of the principal of, premium, if any, or interest on any of the Securities, segregate and hold in trust for the benefit of the Persons entitled thereto a sum sufficient to pay the principal,
premium, if any, or interest so becoming due until such sums shall be paid to such Persons or otherwise disposed of as herein provided, and the Company will promptly notify the Trustee of its action or failure so to act. 
 Whenever the Company shall have one or more Paying Agents, it will, no later than 12:00 noon Eastern time on each due date of the principal of, premium,
if any, or interest on any Securities, deposit with such Paying Agent(s) a sum sufficient to pay the principal, premium, if any, or interest so becoming due, such sum to be held for the benefit of the Persons entitled to such principal, premium, if
any, or interest, and (unless such Paying Agent is the Trustee) the Company will promptly notify the Trustee of any failure so to act. 
 The
Company will cause each Paying Agent other than the Trustee to execute and deliver to the Trustee an instrument in which such Paying Agent shall agree with the Trustee, subject to the provisions of this Section 8.3, that such Paying
Agent will: 
 (a) hold all sums held by it for the payment of the principal of, premium, if any, or interest on Securities for the benefit
of the Persons entitled thereto until such sums shall be paid to such Persons or otherwise disposed of as herein provided; 
 (b) give the
Trustee notice of any default by the Company (or any other obligor upon the Securities) in the making of any payment of principal, premium, if any, or interest; and 
 (c) at any time during the continuance of any such default, upon the written request of the Trustee, forthwith pay to the Trustee all sums so held by such Paying Agent. 
 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 by Company
Order 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 trusts as those upon which such sums were held by the Company or such Paying Agent;
and, upon such payment by any Paying Agent to the Trustee, such Paying Agent shall be released from all further liability with respect to such money. 
 Anything contained herein to the contrary notwithstanding, any money held by the Trustee or any Paying Agent in trust for the payment and discharge of the principal of, premium, if any, or interest on any Security
that remains unclaimed for two (2) years after the date when each payment of such principal, premium, or interest has become payable shall, upon the request of the Company, 

  

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be repaid by the Trustee to the Company as its absolute property free from trust, and the Trustee shall thereupon be released and discharged with respect
thereto and the Holders shall look only to the Company for the payment of the principal, premium or interest on such Security. The Trustee shall not be liable to the Company or any Holder for interest on funds held by it for the payment and
discharge of the principal, premium or interest on any of the Securities to any Holder. The Company shall not be liable for any interest on the sums paid to it pursuant to this paragraph and shall not be regarded as a trustee of such money.

 SECTION 8.4 Existence. 
 Subject to Article VI, the Company will do or cause to be done all things necessary to preserve and keep in full force and effect its existence, rights (charter and statutory) and franchises; provided, however, that the
Company shall not be required to preserve any such right or franchise if the Board of Directors shall determine that the preservation thereof is no longer desirable in the conduct of the business of the Company and that the loss thereof is not
disadvantageous in any material respect to the Holders. 
 SECTION 8.5 Statement by Officers as to Default. 
 The Company shall deliver to the Trustee, within one hundred twenty (120) days after the end of each fiscal year of the Company ending after the date
hereof, an Officers’ Certificate (one of the signers of which shall be the Company’s principal executive, principal financial or principal accounting officer), stating whether or not to the best knowledge of the signers thereof the Company
is in default in the performance and observance of any of the terms, provisions and conditions of this Indenture (without regard to any period of grace or requirement of notice provided hereunder) and, if the Company shall be in default, specifying
all such defaults and the nature and status thereof of which they have knowledge. 
 The Company will deliver to the Trustee, forthwith upon
becoming aware of any default in the performance or observance of any covenant, agreement or condition contained in this Indenture, or any Event of Default, an Officers’ Certificate specifying with particularity such default or Event of Default
and further stating what action the Company has taken, is taking or proposes to take with respect thereto. 
 Any notice required to be given
under this Section 8.5 shall be delivered to the Trustee at the Corporate Trust Office. 
 SECTION 8.6 Delivery of Certain
Information. 
 The Company will deliver to the Trustee within fifteen (15) days after the filing of the same with the
Commission, copies of the quarterly and annual reports and of the information, documents and other reports, if any, which the Company is required to file with the Commission pursuant to Section 13 or 15(d) of the Exchange Act. Documents filed
by the Company with the Commission via the EDGAR system shall be deemed to be filed with the Trustee as of the time such documents are filed via EDGAR. Notwithstanding that the Company may not be subject to the reporting requirements of
Section 13 or 15(d) of the Exchange Act, the Company will file with the Commission, to the extent permitted, and provide the Trustee and Holders with such annual reports and such information, documents and other reports specified in Sections 13
and 15(d) of the 

  

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Exchange Act. Delivery of such reports, information and documents to the Trustee is for informational purposes only and the Trustee’s receipt of such
shall not constitute constructive notice of any information contained therein or determinable from information contained therein. 
 SECTION 8.7 Incurrence of Indebtedness. 
 The Company will not, and will not permit any of its Subsidiaries to, incur
or suffer to exist (i) at any time that $10,000,000 or more in aggregate principal amount of the Securities are outstanding, Indebtedness that is structurally senior or senior by its terms to the Securities or (ii) Secured Indebtedness, in
an aggregate principal amount exceeding $10,000,000, unless the Securities are equally and ratably secured with such Secured Indebtedness in excess of such $10,000,000 limit; provided that Liens in favor of Strategic Partners granted in
connection with biopharmaceutical licensing and/or partnering arrangements shall not be subject to these restrictions. 
 ARTICLE IX 

 MAKE-WHOLE PROVISION 
 Upon the conversion of any Security pursuant to Article X hereof the Company will pay to the Holders of the Securities so converted cash with respect to the Security so converted in an amount equal to U.S. $0.40 per $1.00 principal
amount of the Securities, less the amount of any interest paid on the Securities before the relevant Conversion Date (the “Make-Whole Payment”). The Company shall pay the Make-Whole Payment within five (5) business days
of the applicable Conversion Date. 
 ARTICLE X 
 CONVERSION OF SECURITIES 
 SECTION 10.1 Conversion Privilege and Conversion Rate.

 Subject to and upon compliance with the provisions of this Article X, at the option of the Holder thereof, any Security or
any portion of the principal amount thereof that is U.S. $1,000 or an integral multiple of U.S. $1,000 may be converted into fully paid and nonassessable shares (calculated as to each conversion to the nearest 1/100th of a share) of Common Stock of
the Company at the Conversion Rate, determined as hereinafter provided, in effect at the time of conversion. Such conversion right shall commence upon the original issuance of the Securities and expire at the close of business two (2) Business
Days prior to the Stated Maturity, unless the Security has been previously repurchased or converted, subject, in the case of conversion of any Global Security, to any Applicable Procedures. In case the Holder of a Security exercises his right to
require the Company to repurchase the Security, such conversion right in respect of the Security, or portion thereof so called, shall expire at the close of business on the Business Day immediately preceding the Repurchase Date, unless the Company
defaults in making the payment due upon repurchase (in each case subject, as aforesaid, to any Applicable Procedures with respect to any Global Security). 
 The rate at which shares of Common Stock shall be delivered upon conversion (herein called the “Conversion Rate”) shall be initially 0.7874016 shares of Common Stock for each U.S. $1.00
principal amount of Securities. The Conversion Rate shall be adjusted in certain instances as provided in this Article X. 
  

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 SECTION 10.2 Exercise of Conversion Privilege. 
 In order to exercise the conversion privilege, the Holder of any Security to be converted shall surrender such Security, duly endorsed or assigned to the
Company or in blank, at any office or agency of the Company maintained for that purpose pursuant to Section 8.2, accompanied by a duly signed and completed notice of conversion substantially in the form attached hereto as Exhibit C
stating that the Holder elects to convert such Security or, if less than the entire principal amount thereof is to be converted, the portion thereof to be converted. Each Security surrendered for conversion (in whole or in part) during the period
from the close of business on any Regular Record Date next preceding any Interest Payment Date to the opening of business on such Interest Payment Date shall (except in the case of any Security or portion thereof that is to be repurchased on a
Repurchase Date, with the consequence that the conversion right of such Security would terminate between such Regular Record Date and the close of business on such Interest Payment Date) be accompanied by payment in New York Clearing House funds or
other funds acceptable to the Company of an amount equal to the interest payable on such Interest Payment Date on the principal amount of such Security (or part thereof, as the case may be) being surrendered for conversion. The interest so payable
on such Interest Payment Date, with respect to any Security (or portion thereof, if applicable) that is surrendered for conversion during the period from the close of business on any Regular Record Date next preceding any Interest Payment Date to
the opening of business on such Interest Payment Date, shall be paid to the Holder of such Security as of such Regular Record Date. Interest payable in respect of any Security surrendered for conversion on or after an Interest Payment Date shall be
paid to the Holder of such Security as of the next preceding Regular Record Date, notwithstanding the exercise of the right of conversion. Except as provided in this paragraph and subject to the last paragraph of Section 2.8, no cash
payment or adjustment shall be made upon any conversion on account of any interest accrued from the Interest Payment Date next preceding the conversion date, in respect of any Security (or part thereof, as the case may be) surrendered for
conversion, or on account of any dividends on the Common Stock issued upon conversion. The Company’s delivery to the Holder of the number of shares of Common Stock (and cash in lieu of fractions thereof, as provided in this Indenture) into
which a Security is convertible and any rights pursuant to Section 10.6(m) will be deemed to satisfy the Company’s obligation to pay the principal amount of the Security. 
 Securities shall be deemed to have been converted on the day of surrender of such Securities for conversion in accordance with the foregoing provisions,
and at such time the rights of the Holders of such Securities as Holders shall cease, and the Person or Persons entitled to receive the Common Stock issuable upon conversion shall be treated for all purposes as the record holder or holders of such
Common Stock at such time. As promptly as practicable on or after the conversion date, the Company shall issue and deliver to the Trustee, for delivery to the Holder, a certificate or certificates for the number of full shares of Common Stock
issuable upon conversion, together with payment in lieu of any fraction of a share, as provided in Section 10.3. 
 Neither the
Trustee nor any agent maintained for the purpose of such conversion shall have any responsibility for the inclusion or content of any restrictive legends on such Common Stock; provided, however, that the Trustee or any agent maintained for
the purpose of such conversion shall have provided to the Company or to the Company’s transfer agent for such Common Stock, prior to or concurrently with a request to the Company to deliver such Common Stock, written notice that the Securities
delivered for conversion are Securities. 
  

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 In the case of any Security that is converted in part only, upon such conversion the Company shall
execute and the Trustee shall authenticate and make available for delivery to the Holder thereof, at the expense of the Company, a new Registered Security or Securities of authorized denominations in an aggregate principal amount equal to the
unconverted portion of the principal amount of such Security. A Security may be converted in part, but only if the principal amount of such Security to be converted is any integral multiple of U.S. $1,000 and the principal amount of such
security to remain Outstanding after such conversion is equal to U.S. $1,000 or any integral multiple of U.S. $1,000 in excess thereof. 
 Notwithstanding anything to the contrary contained herein, the number of Conversion Shares that may be acquired by the Holder upon any conversion of the Securities (or otherwise in respect hereof) shall be limited to the extent necessary to
insure that, following such exercise (or other issuance), the total number of shares of Common Stock then beneficially owned by such Holder and its Affiliates and any other persons whose beneficial ownership of Common Stock would be aggregated with
the Holder’s for purposes of Section 13(d) of the Exchange Act, does not exceed 9.999% of the total number of issued and outstanding shares of Common Stock (including for such purpose the shares of Common Stock issuable upon such
conversion). For such purposes, beneficial ownership shall be determined in accordance with Section 13(d) of the Exchange Act and the rules and regulations promulgated thereunder. This provision shall not restrict the number of shares
of Common Stock which a Holder may receive or beneficially own in order to determine the amount of securities or other consideration that such Holder may receive in the event of a Change in Control. This restriction may not be waived.

 Unless and until the Trustee receives an Officers’ Certificate from the Company notifying the Trustee that, upon a conversion of
Securities, a Holder would own in excess of 9.999% of the total number of issued and outstanding shares of Common Stock (including for such purpose the shares of Common Stock issuable upon such conversion), the Trustee may assume without inquiry
(i) that no Holder owns or upon a conversion of Securities would own in excess of that number and, therefore, (ii) that each Holder is in compliance with the requirements of this Section 10.2. 
 SECTION 10.3 Fractions of Shares. 
 No fractional shares of Common Stock shall be issued upon conversion of any Security or Securities. If more than one Security shall be surrendered for conversion at one time by the same Holder, the number of full shares that shall be
issuable upon conversion thereof shall be computed on the basis of the aggregate principal amount of the Securities (or specified portions thereof) so surrendered. Instead of any fractional share of Common Stock that would otherwise be issuable upon
conversion of any Security or Securities (or specified portions thereof), the Company shall calculate and pay a cash adjustment in respect of such fraction (calculated to the nearest 1/100th of a share) in an amount equal to the same fraction of the
Closing Price at the close of business on the day of conversion. 
  

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 SECTION 10.4 Adjustment of Conversion Rate. 
 The Conversion Rate shall be subject to adjustments from time to time as follows: 
 (a) In case the Company shall pay or make a dividend or other distribution on any class of capital stock of the Company payable in shares of Common Stock,
the Conversion Rate in effect at the opening of business on the day following the date fixed for the determination of stockholders entitled to receive such dividend or other distribution shall be increased by dividing such Conversion Rate by a
fraction of which the numerator shall be the number of shares of Common Stock outstanding at the close of business on the date fixed for such determination and the denominator shall be the sum of such number of shares and the total number of shares
constituting such dividend or other distribution, such increase to become effective (subject to paragraph (l) of this Section 10.4) immediately after the opening of business on the day following the date fixed for such
determination. For the purposes of this paragraph (a), the number of shares of Common Stock at any time outstanding shall not include shares held in the treasury of the Company but shall include shares issuable in respect of scrip certificates
issued in lieu of fractions of shares of Common Stock. The Company will not pay any dividend or make any distribution on shares of Common Stock held in the treasury of the Company. 
 (b) In case the Company shall issue rights, options or warrants to all holders of its Common Stock entitling them to subscribe for or purchase shares of
Common Stock at a price per share less than the current market price per share (determined as provided in paragraph (h) of this Section 10.4) of the Common Stock on the date fixed for the determination of stockholders entitled to
receive such rights, options or warrants (other than any rights, options or warrants (1) that by their terms will also be issued to any Holder upon conversion of a Security into shares of Common Stock without any action required by the Company
or any other Person or (2) that are only exercisable upon the occurrence of a specified triggering event and such triggering event has not occurred), the Conversion Rate in effect at the opening of business on the day following the date fixed
for such determination shall be increased by dividing such Conversion Rate by a fraction of which the numerator shall be the number of shares of Common Stock outstanding at the close of business on the date fixed for such determination plus the
number of shares of Common Stock which the aggregate of the offering price of the total number of shares of Common Stock so offered for subscription or purchase would purchase at such current market price and the denominator shall be the number of
shares of Common Stock outstanding at the close of business on the date fixed for such determination plus the number of shares of Common Stock so offered for subscription or purchase, such increase to become effective (subject to paragraph
(l) of this Section 10.4) immediately after the opening of business on the day following the date fixed for such determination. For the purposes of this paragraph (b), the number of shares of Common Stock at any time outstanding
shall not include shares held in the treasury of the Company but shall include shares issuable in respect of scrip certificates issued in lieu of fractions of shares of Common Stock. The Company will not issue any rights, options or warrants in
respect of shares of Common Stock held in the treasury of the Company. 
 (c) In case outstanding shares of Common Stock shall be subdivided
into a greater number of shares of Common Stock, the Conversion Rate in effect at the opening of business on the day following the day upon which such subdivision becomes effective shall be proportionately increased, and, conversely, in case
outstanding shares of Common Stock shall each be combined into a smaller number of shares of Common Stock, the Conversion Rate in effect at the opening of business on the day following the day upon which such combination becomes effective shall be
proportionately reduced, such increase or reduction, as the case may be, to become effective immediately after the opening of business on the day following the day upon which such subdivision or combination becomes effective. 
  

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 (d) In case the Company shall, by dividend or otherwise, distribute to all holders of its Common Stock
evidences of its Indebtedness, shares of any class of capital stock, or other property (including cash or assets or securities, but excluding (1) any rights, options or warrants referred to in paragraph (b) of this Section 10.4
and the distribution of rights to all holders of Common Stock pursuant to the adoption of a stockholders’ rights plan or the detachment of such rights under the terms of such stockholders’ rights plan, (2) any dividend or distribution
paid in cash, except as set forth in paragraphs (e) and (f) of this Section 10.4, (3) any dividend or distribution referred to in paragraph (a) of this Section 10.4 and (4) any merger or consolidation
paid in cash to which Section 10.11 applies), the Conversion Rate shall be adjusted so that the same shall equal the rate determined by dividing the Conversion Rate in effect immediately prior to the close of business on the date fixed
for the determination of stockholders entitled to receive such distribution by a fraction of which the numerator shall be the current market price per share (determined as provided in paragraph (h) of this Section 10.4) of the
Common Stock on the date fixed for such determination less the then fair market value (as determined by the Board of Directors, whose determination shall be conclusive and described in a Board Resolution) of the portion of the assets, shares or
evidences of Indebtedness so distributed applicable to one share of Common Stock and the denominator shall be such current market price per share of the Common Stock, such adjustment to become effective (subject to paragraph (l) of this
Section 10.4) immediately prior to the opening of business on the day following the date fixed for the determination of stockholders entitled to receive such distribution. 
 If the Company implements a stockholders’ rights plan (“New Rights Plan”), the Company will provide under such New Rights
Plan that the Holders of the Securities will receive, in addition to the Common Stock, the rights under the New Rights Plan (whether or not the rights under the New Rights Plan have separated from the Common Stock at the time of conversion), subject
to any limitations set forth in the New Rights Plan. 
 (e) In case the Company shall, by dividend or otherwise, distribute to all holders of
its Common Stock cash (excluding cash portions of distribution referred to in Section 10.4(d) and any cash that is distributed upon a merger or consolidation to which Section 10.11 applies) in an aggregate amount that,
combined together with (1) the aggregate amount of any other cash distributions to all holders of its Common Stock made exclusively in cash within the 365-day period preceding the date of payment of such distribution and in respect of which no
adjustment pursuant to this paragraph (e) has been made and (2) the aggregate of any cash plus the fair market value (as determined by the Board of Directors, whose determination shall be conclusive and described in a Board Resolution) of
consideration payable in respect of any tender offer by the Company or any Subsidiary for all or any portion of the Common Stock concluded within the 365-day period preceding the date of payment of such distribution and in respect of which no
adjustment pursuant to paragraph (f) of this Section 10.4 has been made (the “Combined Cash and Tender Amount”) exceeds one percent (1%) of the product of the current market price per share (determined
as provided in paragraph (h) of this Section 10.4) of the Common Stock on the date for the determination of holders of shares of Common Stock entitled to receive such distribution times the number of shares of Common Stock
outstanding on such date (the “Aggregate Current Market Price”), then, and in each such case, immediately after the close of business on such date for 

  

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determination, subject to paragraph (l) of Section 10.4, the Conversion Rate shall be adjusted so that the same shall equal the rate
determined by dividing the Conversion Rate in effect immediately prior to the close of business on the date fixed for determination of the stockholders entitled to receive such distribution by a fraction (A) the numerator of which shall be
equal to the current market price per share (determined as provided in paragraph (h) of this Section 10.4) of the Common Stock on the date fixed for such determination less an amount equal to the quotient of (i) the excess of
such Combined Cash and Tender Amount over one percent (1%) of such Aggregate Current Market Price divided by (ii) the number of shares of Common Stock outstanding on such date fixed for determination and (B) the denominator of which
shall be equal to the current market price per share (determined as provided in paragraph (h) of this Section 10.4) of the Common Stock on such date fixed for determination. 
 (f) In case a tender offer made by the Company or any Subsidiary for all or any portion of the Common Stock shall be completed for an aggregate
consideration consisting of cash and/or property having a fair market value (as determined by the Board of Directors, whose determination shall be conclusive and described in a Board Resolution) that combined together with (1) the aggregate of
the cash plus the fair market value (as determined by the Board of Directors, whose determination shall be conclusive and described in a Board Resolution), of consideration payable in respect of any other tender offer by the Company or any
Subsidiary for all or any portion of the Common Stock concluded within the 365-day period preceding the completion of such tender offer and in respect of which no adjustment pursuant to this paragraph (f) has been made and (2) the
aggregate amount of any distributions to all holders of the Company’s Common Stock made exclusively in cash within the 365-day period preceding the completion of such tender offer and in respect of which no adjustment pursuant to paragraph
(e) of this Section 10.4 has been made (the “Combined Tender and Cash Amount”) exceeds ten percent (10%) of the product of the current market price per share of the Common Stock (determined as provided
in paragraph (h) of this Section 10.4) as of the completion of such tender offer (the “Completion Date”) times the number of shares of Common Stock outstanding (including any tendered shares) as of the
Completion Date, then, and in each such case, immediately prior to the opening of business on the day after the date of the Completion Date, the Conversion Rate shall be adjusted so that the same shall equal the rate determined by dividing the
Conversion Rate immediately prior to close of business on the Completion Date by a fraction (A) the numerator of which shall be equal to (i) the product of (x) the current market price per share of the Common Stock (determined as
provided in paragraph (h) of this Section 10.4) on the Completion Date multiplied by (y) the number of shares of Common Stock outstanding (including any tendered shares) on the Completion Date less (ii) the Combined Tender
and Cash Amount, and (B) the denominator of which shall be equal to the product of (x) the current market price per share of the Common Stock (determined as provided in paragraph (h) of this Section 10.4) as of the
Completion Date multiplied by (y) the number of shares of Common Stock outstanding (including any tendered shares) as of the Completion Date less the number of all shares validly tendered and not withdrawn as of the Completion Date. 

(g) The reclassification of Common Stock into securities including other than Common Stock (other than any reclassification upon a consolidation or
merger to which Section 10.11 applies) shall be deemed to involve (1) a distribution of such securities other than Common Stock to all holders of Common Stock (and the effective date of such reclassification shall be deemed to be
“the date fixed for the determination of stockholders entitled to receive such distribution” and “the date fixed for such determination” within the meaning of paragraph (d) of this Section 10.4), and 

  

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(2) a subdivision or combination, as the case may be, of the number of shares of Common Stock outstanding immediately prior to such reclassification
into the number of shares of Common Stock outstanding immediately thereafter (and the effective date of such reclassification shall be deemed to be “the day upon which such subdivision becomes effective” or “the day upon which such
combination becomes effective”, as the case may be, and “the day upon which such subdivision or combination becomes effective” within the meaning of paragraph (c) of this Section 10.4). 
 (h) For the purpose of any computation under paragraphs (b), (d), (e) or (f) of this Section 10.4, the current market price per
share of Common Stock on any date shall be calculated by the Company and be deemed to be the Volume Weighted Average Price for the Trading Day before the “ex date” with respect to the issuance or distribution requiring such computation.
For purposes of this paragraph, the term “ex date,” when used with respect to any issuance or distribution, means the first date on which the Common Stock trades regular way in the applicable securities market or on the applicable
securities exchange without the right to receive such issuance or distribution. 
 (i) No adjustment in the Conversion Rate shall be required
unless such adjustment (plus any adjustments not previously made by reason of this paragraph (i)) would require an increase or decrease of at least one percent in such rate; provided, however, that any adjustments which by reason of this
paragraph (i) are not required to be made shall be carried forward and taken into account in any subsequent adjustment. All calculations under this Article X shall be made to the nearest cent or to the nearest one-hundredth of a
share, as the case may be. 
 (j) The Company may make such increases in the Conversion Rate, for the remaining term of the Securities or any
shorter term, in addition to those required by paragraphs (a), (b), (c), (d), (e) and (f) of this Section 10.4, as it considers to be advisable in order to avoid or diminish any income tax liability to any holders of shares of
Common Stock resulting from any dividend or distribution of Common Stock or issuance of rights or warrants to purchase or subscribe for Common Stock or from any event treated as such for income tax purposes. 
 To the extent permitted by applicable law, the Company from time to time may increase the Conversion Rate by any amount for any period of time if the
period is at least twenty (20) days and the Board of Directors shall have made a determination that such increase would be in the best interests of the Company, which determination shall be conclusive. Whenever the Conversion Rate is increased
pursuant to the preceding sentence, the Company shall give notice of the increase to the Holders of Securities in the manner provided in Section 1.6 at least fifteen (15) days prior to the date the increased Conversion Rate takes
effect, and such notice shall state the increased Conversion Rate and the period during which it will be in effect. 
 (k) Notwithstanding
the foregoing provisions of this Section 10.4, no adjustment of the Conversion Rate shall be required to be made (1) upon the issuance of shares of Common Stock pursuant to any present or future plan for the reinvestment of
dividends, (2) because of a tender or exchange offer of the character described in Rule 13e-4(h) (5) under the Exchange Act or any successor rule thereto or (3) as a result of a rights plan or poison pill implemented by the Company.

 (l) In any case in which this Section 10.4 shall require that an adjustment be made immediately following a record date, the
Company may elect to defer the effectiveness of such adjustment (but in no event until a date later than the effective time of the event giving rise to such 

  

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adjustment), in which case the Company shall, with respect to any Security converted after such record date and on and before such adjustment shall have
become effective (1) defer paying any cash payment pursuant to Section 10.3 hereof or issuing to the Holder of such Security the number of shares of Common Stock issuable upon such conversion in excess of the number of shares of
Common Stock issuable thereupon only on the basis of the Conversion Rate prior to adjustment, and (2) not later than five (5) Business Days after such adjustment shall have become effective, pay to such Holder the appropriate cash payment
pursuant to Section 10.3 hereof and issue to such Holder the additional shares of Common Stock issuable on such conversion. Notwithstanding the foregoing, no adjustment of the Conversion Rate shall be made if the event giving rise to
such adjustment does not occur. 
 (m) In the event that the Company distributes rights or warrants (other than those referred to in
paragraph (b) above) pro rata to holders of Common Stock, so long as any such rights or warrants have not expired, the Company shall make proper provision so that the Holder of any Security surrendered for conversion will be entitled to receive
upon such conversion, in addition to the Common Stock issuable upon conversion of the Securities (the “Conversion Shares”), a number of rights and warrants to be determined as follows: (i) if such conversion occurs on or
prior to the date for the distribution to the holders of rights or warrants of separate certificates evidencing such rights or warrants (the “Distribution Date”), the same number of rights or warrants to which a holder of a
number of shares of Common Stock equal to the number of Conversion Shares is entitled at the time of such conversion in accordance with the terms and provisions of and applicable to the rights or warrants, and (ii) if such conversion occurs
after such Distribution Date, the same number of rights or warrants to which a holder of the number of shares of Common Stock into which the principal amount of such Security so converted was convertible immediately prior to such Distribution Date
would have been entitled on such Distribution Date in accordance with the terms and provisions of and applicable to the rights or warrants. 
 (n) In the event of a Change in Control, the Conversion Rate shall automatically adjust to 90% of the Conversion Rate in effect immediately prior to the event that results in a Change of Control. If the transaction causing the Change in
Control is not consummated for any reason, the Conversion Rate shall revert back to the Conversion Rate in effect prior to the adjustment provided by this section. 
 (o) Notwithstanding anything to the contrary, in the event that the Company shall effect any increase in the Conversion Rate pursuant to this Section 10.4, the Company shall procure any required
shareholder approvals. 
 SECTION 10.5 Notice of Adjustments of Conversion Rate. 
 Whenever the Conversion Rate is adjusted as herein provided: 
 (a) the Company shall compute the adjusted Conversion Rate in accordance with Section 10.4 and shall prepare a certificate signed by the Chief Financial Officer of the Company setting forth the adjusted
Conversion Rate and showing in reasonable detail the facts upon which such adjustment is based, and such certificate shall promptly be filed with the Trustee and with the Conversion Agent; and 
  

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 (b) upon each such adjustment, a notice stating that the Conversion Rate has been adjusted and setting
forth the adjusted Conversion Rate shall be required, and as soon as practicable after it is required, such notice shall be provided by the Company to all Holders in accordance with Section 1.6. 
 Neither the Trustee nor the Conversion Agent shall be under any duty or responsibility with respect to any such certificate or the information and
calculations contained therein, except to exhibit the same to any Holder of Securities desiring inspection thereof at its office during normal business hours. Unless and until a Responsible Officer of the Trustee and Conversion Agent receive notice
of an adjusted Conversion Rate, the Trustee and the Conversion Agent may rely without inquiry on the Conversion Rate most recently in effect. 
 SECTION 10.6 Notice of Certain Corporate Action. 
 In case: 
 (a) the Company shall declare a dividend (or any other distribution) on its Common Stock payable (i) otherwise than exclusively in cash or
(ii) exclusively in cash in an amount that would require any adjustment pursuant to Section 10.4; or 
 (b) the Company
shall authorize the granting to the holders of its Common Stock of rights, options or warrants to subscribe for or purchase any shares of capital stock of any class or of any other rights; 
 (c) or of any reclassification of the Common Stock of the Company, or of any consolidation, merger or share exchange to which the Company is a party and
for which approval of any stockholders of the Company is required, or of the conveyance, sale, transfer or lease of all or substantially all of the assets of the Company; or 
 (d) of the voluntary or involuntary dissolution, liquidation or winding up of the Company; 
 then the Company shall cause to be filed at each office or agency maintained for the purpose of conversion of Securities pursuant to Section 8.2, and shall cause to be provided to all Holders in accordance with
Section 1.6, at least twenty (20) days (or ten (10) days in any case specified in clause (a) or (b) above) prior to the applicable record or effective date hereinafter specified, a notice stating (1) the date on which a
record is to be taken for the purpose of such dividend, distribution, rights, options or warrants, or, if a record is not to be taken, the date as of which the holders of Common Stock of record to be entitled to such dividend, distribution, rights,
options or warrants are to be determined or (2) the date on which such reclassification, consolidation, merger, conveyance, transfer, sale, lease, dissolution, liquidation or winding up is expected to become effective, and the date as of which
it is expected that holders of Common Stock of record shall be entitled to exchange their shares of Common Stock for securities, cash or other property deliverable upon such reclassification, consolidation, merger, conveyance, transfer, sale, lease,
dissolution, liquidation or winding up. Neither the failure to give such notice or the notice referred to in the following paragraph nor any defect therein shall affect the legality or validity of the proceedings described in clauses
(a) through (d) of this Section 10.6. If at the time the Trustee shall not be the Conversion Agent, a copy of such notice shall also forthwith be filed by the Company with the Trustee. 
  

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 The Company shall cause to be filed at each office or agency maintained for the purpose of conversion of
Securities pursuant to Section 8.2, and shall cause to be provided to all Holders in accordance with Section 1.6, notice of any tender offer by the Company or any Subsidiary for all or any portion of the Common Stock at or
about the time that such notice of tender offer is provided to the public generally. 
 SECTION 10.7 Company to Reserve Common
Stock. 
 The Company shall at all times reserve and keep available, free from preemptive rights, out of its authorized but unissued
Common Stock, for the purpose of effecting the conversion of Securities, the full number of shares of Common Stock then issuable upon the conversion of all Outstanding Securities. 
 SECTION 10.8 Taxes on Conversions. 
 Except as provided in the next sentence, the Company will pay any and all taxes and duties that may be payable in respect of the issue or delivery of shares of Common Stock on conversion of Securities pursuant hereto. The Company shall not,
however, be required to pay any tax or duty which may be payable in respect of any transfer involved in the issue and delivery of shares of Common Stock in a name other than that of the Holder of the Security or Securities to be converted, and no
such issue or delivery shall be made unless and until the Person requesting such issue has paid to the Company the amount of any such tax or duty or has established to the satisfaction of the Company that such tax or duty has been paid. 

SECTION 10.9 Covenant as to Common Stock. 
 The Company agrees that all shares of Common Stock that may be delivered upon conversion of Securities, upon such delivery, will be newly issued shares and will have been duly authorized and validly issued and will be
fully paid and nonassessable and, except as provided in Section 10.8, the Company will pay all taxes, liens and charges with respect to the issue thereof. 
 SECTION 10.10 Cancellation of Converted Securities. 
 All Securities delivered for conversion
shall be delivered to the Trustee or its agent to be cancelled by or at the direction of the Trustee, which shall dispose of the same as provided in Section 2.10. 
 SECTION 10.11 Provision in Case of Consolidation, Merger or Sale of Assets. 
 In case of any consolidation or merger of the Company with or into any other Person, any merger of another Person with or into the Company (other than a
merger that does not result in any reclassification, conversion, exchange or cancellation of outstanding shares of Common Stock of the Company) or any conveyance, sale, transfer or lease of all or substantially all of the assets of the Company, the
Person formed by such consolidation or resulting from such merger or that acquires such assets, as the case may be, shall execute and deliver to the Trustee a supplemental indenture providing that the Holder of each Security then Outstanding shall
have the right thereafter, during the period such Security shall be convertible as specified in Section 10.1, to convert such Security only into the kind and amount of securities, cash and other property receivable upon such 

  

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consolidation, merger, conveyance, sale, transfer or lease by a holder of the number of shares of Common Stock of the Company into which such Security might
have been converted immediately prior to such consolidation, merger, conveyance, sale, transfer or lease, assuming such holder of Common Stock of the Company (a) is not a Person with which the Company consolidated or merged with or into or that
merged into or with the Company or to which such conveyance, sale, transfer or lease was made, as the case may be (a “Constituent Person”), or an Affiliate of a Constituent Person and (b) failed to exercise his rights of
election, if any, as to the kind or amount of securities, cash and other property receivable upon such consolidation, merger, conveyance, sale, transfer or lease (provided that if the kind or amount of securities, cash and other property receivable
upon such consolidation, merger, conveyance, sale, transfer, or lease is not the same for each share of Common Stock of the Company held immediately prior to such consolidation, merger, conveyance, sale, transfer or lease by other than a Constituent
Person or an Affiliate thereof and in respect of which such rights of election shall not have been exercised (“Non-electing Share”), then for the purpose of this Section 10.11 the kind and amount of securities,
cash and other property receivable upon such consolidation, merger, conveyance, sale, transfer or lease by the holders of each Non-electing Share shall be deemed to be the kind and amount so receivable per share by a plurality of the Non-electing
Shares). Such supplemental indenture shall provide for adjustments that, for events subsequent to the effective date of such supplemental indenture, shall be as nearly equivalent as may be practicable to the adjustments provided for in this
Article X. The above provisions of this Section 10.11 shall similarly apply to successive consolidations, mergers, conveyances, sales, transfers or leases. Notice of the execution of such a supplemental indenture shall be
given by the Company to the Holder of each Security as provided in Section 1.6 promptly upon such execution. 
 Neither the Trustee nor
the Conversion Agent shall be under any responsibility to determine the correctness of any provisions contained in any such supplemental indenture relating either to the kind or amount of shares of stock or other securities or property or cash
receivable by Holders of Securities upon the conversion of their Securities after any such consolidation, merger, conveyance, transfer, sale or lease or to any such adjustment but may accept as conclusive evidence of the correctness of any such
provisions, and shall be protected in relying upon, an Officers Certificate or an Opinion of Counsel with respect thereto, which the Company shall cause to be furnished to the Trustee upon request. 
 SECTION 10.12 Responsibility of Trustee for Conversion Provisions. 
 (a) The Trustee, subject to the provisions of Section 5.1, and any Conversion Agent shall not at any time be under any duty or responsibility
to any Holder of Securities to determine whether any facts exist that may require any adjustment of the Conversion Rate, or with respect to the nature or extent of any such adjustment when made, or with respect to the method employed herein or in
any supplemental indenture in making the same, or whether a supplemental indenture need be entered into. Neither the Trustee, subject to the provisions of Section 5.1, nor any Conversion Agent shall be accountable with respect to the
validity or value (or the kind or amount) of any Common Stock, or of any other securities or property or cash, that may at any time be issued or delivered upon the conversion of any Security; and it or they do not make any representation with
respect thereto. Neither the Trustee, subject to the provisions of Section 5.1, nor any Conversion Agent shall be responsible for any failure of the Company to make or calculate any cash payment or to issue, transfer or deliver any
shares of Common Stock or share certificates or other securities or property or cash upon the surrender of any Security for the purpose of conversion; and the Trustee, subject to the provisions of Section 5.1, and any Conversion Agent
shall not be responsible for any failure of the Company to comply with any of the covenants of the Company contained in this Article X. 
  

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 SECTION 10.13 Automatic Conversion. 
 (a) If at any time after September 15, 2009 and on or prior to Stated Maturity, the Closing Price of the Common Stock has exceeded two hundred
percent (200%) of the Conversion Price then in effect for at least twenty (20) Trading Days in any thirty (30) consecutive Trading Day period, ending within five (5) Trading Days prior to the date of the Automatic Conversion
Notice (as defined below) the Securities shall automatically convert as provided herein (an “Automatic Conversion”); provided, however, that such Automatic Conversion shall be subject to Section 10.2 hereof. The
amount of Securities that shall automatically convert for any 30 Trading Day period shall equal the lesser of (i) the value of ten (10) times the Volume Weighted Average Price of the Common Stock during such 20 day triggering period times
the average daily trading volume of the Common Stock during such 20 day period, rounded down to the nearest $1,000, and (ii) one half of the principal amount of the Securities that have been authenticated under the Indenture as of the date of
the Automatic Conversion Notice. Each 30 Trading Day period for which an Automatic Conversion may be triggered shall commence anew at the end of the period which triggered the Automatic Conversion. 
 (b) Upon Automatic Conversion, the Company shall pay to Holders a Make-Whole Payment in accordance with Article IX hereof. 
 (c) At the request and expense of the Company, the Trustee shall mail or cause to be mailed to each Holder notice (the “Automatic Conversion
Notice”) of an Automatic Conversion not more than thirty (30) days but not less than twenty (20) days prior to the date on which the Notes will be Automatically Converted (the “Automatic Conversion
Date”). If the Company gives such notice, it shall also deliver a copy of such Automatic Conversion Notice to the Trustee. Such mailing shall be by first class mail. Such notice, if mailed in the manner herein provided, shall be
conclusively presumed to have been duly given, whether or not the holder receives such notice. In any case, failure to give such notice by mail or any defect in the notice to the holder of any Security shall not affect the validity of the
proceedings for the Automatic Conversion of any other Security. 
 (d) Each Automatic Conversion Notice shall state: 
 (1) the aggregate principal amount of Securities to be automatically converted, 
 (2) the CUSIP, ISIN or similar number or numbers of the Securities being automatically converted, 
 (3) the Automatic Conversion Date, 
 (4) that on and after said date Interest thereon will cease to accrue, 
 (5) the Make-Whole
Payment to be paid by the Company pursuant to Article IX hereof, 
  

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 (6) the place or places where the Securities are to be surrendered for conversion, and

 (7) the Conversion Price then in effect. 
 (e) Prior to or contemporaneous with the mailing of an Automatic Conversion Notice to the Holders, the Company shall issue a press release containing the information contained in the Automatic Conversion Notice.

 (f) In the event of an Automatic Conversion, the Company shall issue and deliver (i) a certificate or certificates for the number of
Conversion Shares and (ii) any cash in respect of any fractional shares of Common Stock otherwise issuable upon conversion or the Make-Whole Payment, for payment to the Holders as promptly after the Automatic Conversion Date, as practicable in
accordance with the provisions of this Article X, but in no event later than the close of business on the third next succeeding Business Day following such Automatic Conversion Date. 
 (g) All Securities subject to an Automatic Conversion shall be delivered to the Trustee or its agent to be cancelled by or at the direction of the
Trustee, which shall dispose of the same as provided in Section 2.10. 
 (h) If less than all the Securities are to be
Automatically Converted, the particular Securities to be converted shall be selected by the Trustee at least five (5) Business Days prior to the date that the Automatic Conversion Notice is given from the Outstanding Securities by lot or such
method as the Trustee may deem fair and appropriate. 
 (i) Upon Automatic Conversion, Interest on the Securities shall cease to accrue and,
except as provided in Section 5.6, to be entitled to any benefit or security under this Indenture, and the holders thereof shall have no right in respect of such Securities except the right to receive the Common Stock and cash, if any,
to which they are entitled pursuant to this Section 10.13. 
 (j) If any of the provisions of this Section 10.13 are
inconsistent with applicable law at the time of such Automatic Conversion, such law shall govern. 
 (k) Notwithstanding anything to the
contrary, in the event that the Company shall effect Automatic Conversion pursuant to this Section 10.13, the Company shall procure any required shareholder approvals. 
 SECTION 10.14 Compensation for Buy-In on Failure to Timely Deliver Certificates Upon Conversion 
 If the Company fails to deliver to a Holder the applicable certificate or certificates for Common Stock by the fifth Trading Day following the delivery of
the notice of conversion to the Trustee, and if after such date such Holder is required by its brokerage firm to purchase (in an open market transaction or otherwise), or the Holder’s brokerage firm purchases, shares of Common Stock to deliver
in satisfaction of a sale by such Holder of the Conversion Shares which such Holder was entitled to receive upon the conversion relating to such notice of conversion (a “Buy-In”), then the Company shall (A) pay in cash
to such Holder (in addition to any other remedies available to or elected by such Holder) the amount by which (x) such Holder’s total purchase price (including any 

  

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brokerage commissions) for the shares of Common Stock so purchased exceeds (y) the product of (1) the aggregate number of shares of Common Stock
that such Holder was entitled to receive from the conversion at issue multiplied by (2) the actual sale price at which the sell order giving rise to such purchase obligation was executed (including any brokerage commissions) and (B) at the
option of such Holder, either reissue (if surrendered) Securities equal to the aggregate principal amount of Securities submitted for conversion or deliver to such Holder the number of shares of Common Stock that would have been issued if the
Company had timely complied with its delivery requirements under Section 10.2. For example, if a Holder purchases shares of Common Stock having a total purchase price of $11,000 to cover a Buy-In with respect to an attempted conversion of
Securities with respect to which the actual sale price (including any brokerage commissions) giving rise to such purchase obligation was a total of $10,000 under clause (A) of the immediately preceding sentence, the Company shall be required to
pay such Holder $1,000. The Holder shall provide the Company written notice indicating the amounts payable to such Holder in respect of the Buy-In and, upon request of the Company, evidence of the amount of such loss. Nothing herein shall limit a
Holder’s right to pursue any other remedies available to it hereunder, at law or in equity including, without limitation, a decree of specific performance and/or injunctive relief with respect to the Company’s failure to timely deliver
certificates representing shares of Common Stock upon conversion of the Securities as required pursuant to the terms hereof. 
 ARTICLE XI

 RANKING 
 The
Securities will rank pari passu in right of payment with all existing and future senior Indebtedness and with the Company’s Existing 2005 Senior Notes, Existing 2006 Senior Notes, Existing 2007 Senior Notes, Existing 2008 Senior Notes, Existing
2008 15% Senior Notes, Existing 2008 18.33% Senior Notes and Existing 2008 Series B 18.33% Senior Notes. The Securities will be senior in right of payment to the Company’s Existing 2003 Senior Subordinated Notes. The Securities will also
effectively be senior in right of payment to the liabilities of the Company’s Subsidiaries. 
 ARTICLE XII 
 REPURCHASE OF SECURITIES AT THE 
 OPTION OF THE HOLDER UPON A CHANGE IN CONTROL 
 SECTION 12.1 Right to Require Repurchase. 
 In the event that a Change in Control shall occur, then each Holder shall have the right, at the Holder’s option, but subject to the provisions of
Section 12.2, to require the Company to repurchase for cash, and upon the exercise of such right the Company shall repurchase, all of such Holder’s Securities, or any portion of the principal amount thereof that is equal to U.S.
$1,000 or any greater integral multiple of U.S. $1,000, on the date (the “Repurchase Date”) that is fixed by the Company at a cash purchase price equal to one hundred percent (100%) of the principal amount of the
Securities to be repurchased plus interest accrued to, but excluding, the Repurchase Date (the “Repurchase Price”); provided, however, that installments of interest on Securities whose Stated Maturity is on or
prior to the Repurchase Date shall be payable to the Holders of such Securities, or one or more Predecessor Securities, registered as such on the relevant Record Date according to their terms and the provisions of Section 2.8. The
Repurchase Date will be determined by the Company 

  

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in the following manner: (i) the Company will give notice of the Change in Control as contemplated in Section 12.2(a); (ii) each Holder
electing to exercise the repurchase right must deliver, on or before the thirtieth (30th) day (or such greater period as may be required by applicable law) after the date of the Company’s notice provided in provision (i) above:
(A) irrevocable written notice to the trustee of such Holder’s exercise of its repurchase right; and (B) the Securities with respect to which such repurchase right is being exercised; and (iii) the Company will make the
repurchase on a date that is no later than forty-five (45) days after the Holder has delivered the notice provided in proviso (ii) above. Such right to require the repurchase of the Securities shall not continue after a discharge of the
Company from its obligations with respect to the Securities in accordance with Article III unless a Change in Control shall have occurred prior to such discharge. Whenever in this Indenture (including Sections 2.2, 4.1(a)
and 4.8) there is a reference, in any context, to the principal of any Security as of any time, such reference shall be deemed to include reference to the Repurchase Price that has become and remains payable in respect of such Security to the
extent that such Repurchase Price is, was or would be so payable at such time, and express mention of the Repurchase Price in any provision of this Indenture shall not be construed as excluding the Repurchase Price in those provisions of this
Indenture when such express mention is not made. 
 SECTION 12.2 Notices; Method of Exercising Repurchase Right, Etc.

 (a) On or before the thirtieth (30th) day after the occurrence of a Change in Control, the Company or, at the request and expense
of the Company on or before the thirtieth (30th) day after such occurrence, the Trustee, shall give to all Holders of Securities, in the manner provided in Section 1.6, notice (the “Company Notice”) of the
occurrence of the Change in Control and of the repurchase right set forth herein arising as a result thereof. The Company shall also deliver a copy of such notice of a repurchase right to the Trustee. 
 Each notice of a repurchase right shall state: 
 (1) the Repurchase Date, 
 (2) the date by which the repurchase right must be exercised,

 (3) the Repurchase Price, 
 (4) a description of the procedure that a Holder must follow to exercise a repurchase right, and the place or places where such Securities are to be surrendered for payment of the Repurchase Price and accrued
interest, if any, 
 (5) that on the Repurchase Date, the Repurchase Price, and accrued interest, if any, will become due and
payable upon each such Security designated by the Holder to be repurchased and that interest thereon shall cease to accrue on and after said date, 
 (6) the Conversion Rate then in effect, the date on which the right to convert the principal amount of the Securities to be repurchased will terminate and the place or places where such Securities may be surrendered
for conversion, 
 (7) the place or places that the Notice of Election of Holder to Require Repurchase attached hereto as
Exhibit B, shall be delivered, and the form of such notice, and 
 (8) the CUSIP number or numbers of such
Securities. 
  

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 No failure of the Company to give the foregoing notices or defect therein shall limit any Holder’s
right to exercise a repurchase right or affect the validity of the proceedings for the repurchase of Securities. 
 If any of the foregoing
provisions or other provisions of this Article XII are inconsistent with applicable law, such law shall govern. 
 (b) To
exercise a repurchase right, a Holder shall deliver to the Trustee on or before the thirtieth (30th) day (or such greater period as may be required by applicable law) after the date of the Company Notice (1) written notice of the
Holder’s exercise of such right, which notice shall set forth the name of the Holder, the principal amount of the Securities to be repurchased (and, if any Security is to repurchased in part, the serial number thereof, the portion of the
principal amount thereof to be repurchased and the name of the Person in which the portion thereof to remain Outstanding after such repurchase is to be registered) and a statement that an election to exercise the repurchase right is being made
thereby, and (2) the Securities with respect to which the repurchase right is being exercised. Such written notice shall be irrevocable, except that the right of the Holder to convert the Securities with respect to which the repurchase right is
being exercised shall continue until the close of business on the Business Day immediately preceding the Repurchase Date. 
 (c) In the event
a repurchase right shall be exercised in accordance with the terms hereof, the Company shall pay or cause to be paid to the Trustee the Repurchase Price in cash for payment to the Holder on the Repurchase Date together with accrued and unpaid
interest to the Repurchase Date payable with respect to the Securities as to which the purchase right has been exercised; provided, however, that installments of interest that mature on or prior to the Repurchase Date shall be payable
in cash to the Holders of such Securities, or one or more Predecessor Securities, registered as such at the close of business on the relevant Regular Record Date. 
 (d) If any Security (or portion thereof) surrendered for repurchase shall not be so paid on the Repurchase Date, the principal amount of such Security (or portion thereof, as the case may be) shall, until paid, bear
interest to the extent permitted by applicable law from the Repurchase Date at the rate then in effect per annum, and each Security shall remain convertible into Common Stock until the principal of such Security (or portion thereof, as the case may
be) shall have been paid or duly provided for. 
 (e) Any Security that is to be repurchased only in part shall be surrendered to the Trustee
(with, if the Company or the Trustee so requires, due endorsement by, or a written instrument of transfer in form satisfactory to the Company and the Trustee duly executed by, the Holder thereof or his attorney duly authorized in writing), and the
Company shall execute, and the Trustee shall authenticate and make available for delivery to the Holder of such Security without service charge, a new Security or Securities, containing identical terms and conditions, each in an authorized
denomination in aggregate principal amount equal to and in exchange for the unrepurchased portion of the principal of the Security so surrendered. 
  

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 (f) No fractions of shares shall be issued upon repurchase of Securities. If more than one Security shall
be repurchased from the same Holder and the Repurchase Price shall be payable in shares of Common Stock, the number of full shares that shall be issuable upon such repurchase shall be computed on the basis of the aggregate principal amount of the
Securities so repurchased. Instead of any fractional share of Common Stock that would otherwise be issuable on the repurchase of any Security or Securities, the Company will deliver to the applicable Holder a check for the current market value of
such fractional share. The current market value of a fraction of a share is determined by multiplying the current market price of a full share by the fraction and rounding the result to the nearest cent. For purposes of this
Section 12.2, the current market price of a share of Common Stock is the average of the high and low sales price per share of the Common Stock on the Trading Day immediately preceding the Repurchase Date. 
 (g) All Securities delivered for repurchase shall be delivered to the Trustee to be canceled at the direction of the Trustee, which shall dispose of the
same as provided in Section 2.10. 
 ARTICLE XIII 
 HOLDERS LISTS AND REPORTS BY 
 TRUSTEE AND COMPANY; NON-RECOURSE

 SECTION 13.1 Company to Furnish Trustee Names and Addresses of Holders. 
 The Company will furnish or cause to be furnished to the Trustee: 
 (a) semi-annually, not more than fifteen (15) days after the Regular Record Date, a list, in such form as the Trustee may reasonably require, of the names and addresses of the Holders of Securities as of such
Regular Record Date, and 
 (b) at such other times as the Trustee may reasonably request in writing, within thirty (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 fifteen (15) days prior to the time such list is furnished; 
 provided, however, that no such list need be furnished so long as the Trustee is acting as Security Registrar. 
 SECTION 13.2 Preservation of Information. 
 (a) The Trustee shall preserve, in as current a
form as is reasonably practicable, the names and addresses of Holders contained in the most recent list furnished to the Trustee as provided in Section 13.1 and the names and addresses of Holders received by the Trustee in its capacity
as Security Registrar. The Trustee may destroy any list furnished to it as provided in Section 13.1 upon receipt of a new list so furnished. 
 (b) After this Indenture has been qualified under the Trust Indenture Act, the rights of Holders to communicate with other Holders with respect to their rights under this Indenture or under the Securities, and the corresponding rights and
duties of the Trustee, shall be as provided by the Trust Indenture Act. 
 (c) Every Holder of Securities, by receiving and holding the same,
agrees with the Company and the Trustee that neither the Company nor the Trustee nor any agent of either of them shall be held accountable by reason of any disclosure of information as to names and addresses of Holders made pursuant to the Trust
Indenture Act. 
  

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 SECTION 13.3 No Recourse Against Others. 
 An incorporator or any past, present or future director, officer, employee or stockholder, as such, of the Company or any successor entity shall not have
any liability for any obligations of the Company under the Securities or this Indenture or for any claim based on, in respect of or by reason of such obligations or their creation. By accepting a Security, each Holder shall waive and release all
such liability. Such waiver and release shall be part of the consideration for the issue of the Securities. 
 SECTION 13.4 Reports by
Trustee. 
 (a) After this Indenture has been qualified under the Trust Indenture Act, the Trustee shall transmit to Holders such
reports concerning the Trustee and its actions under this Indenture as may be required pursuant to the Trust Indenture Act at the times and in the manner provided therein. If required by Section 313(a) of the Trust Indenture Act, the Trustee
shall, within sixty (60) days after each May 15 following the date of this Indenture, deliver to Holders a brief report, dated as of such May 15, that complies with the provisions of such Section 313(a). 
 (b) After this Indenture has been qualified under the Trust Indenture Act, a copy of each such report shall, at the time of such transmission to Holders,
be filed by the Trustee with each stock exchange upon which the Securities are listed, with the Commission and with the Company. The Company will promptly notify the Trustee when the Securities are listed on any stock exchange. 
 SECTION 13.5 Section 13 or 15(d) Reports by Company. 
 After this Indenture has been qualified under the Trust Indenture Act, the Company shall file with the Trustee and the Commission, and transmit to Holders, such information, documents and other reports, and such
summaries thereof, as may be required pursuant to the Trust Indenture Act at the times and in the manner provided therein; provided, however, that any such information, documents or reports required to be filed with the Commission
pursuant to Section 13 or 15(d) of the Exchange Act shall be filed with the Trustee within fifteen (15) days after the same is so required to be filed with the Commission. Documents filed by the Company with the Commission via the EDGAR
system shall be deemed to be filed with the Trustee as of the time such documents are filed via EDGAR. 
 Delivery of such reports,
information and documents to the Trustee is for informational purposes only and the Trustee’s receipt thereof shall not constitute constructive notice of any information contained therein or determinable from information contained therein,
including the Company’s compliance with any of its covenants hereunder (as to which the Trustee is entitled to rely exclusively on Officers’ Certificates). 
  

 64 

 [Signature Page Follows] 
  

 65 

 IN WITNESS WHEREOF, the parties hereto have caused this Indenture to be duly executed, all as of the day
and year first above written. 
  

			
	CELL THERAPEUTICS, INC.
		
	By	 	/s/ James A. Bianco, M.D.
	Name:	 	James A. Bianco, M.D.
	Title:	 	Chief Executive Officer
	
	U.S. BANK NATIONAL ASSOCIATION, as Trustee
		
	By	 	/s/ Paula M. Oswald
	Name:	 	Paula M. Oswald
	Title:	 	Vice President

  

 66 

 EXHIBIT A 
 [FORM OF FACE] 
 [THE FOLLOWING LEGEND SHALL APPEAR ON THE FACE OF EACH GLOBAL SECURITY: 
 THIS NOTE IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE DEPOSITARY OR A NOMINEE
OF THE DEPOSITARY, WHICH MAY BE TREATED BY THE COMPANY, THE TRUSTEE AND ANY AGENT THEREOF AS OWNER AND HOLDER OF THIS NOTE FOR ALL PURPOSES.] 
 [THE
FOLLOWING LEGEND SHALL APPEAR ON THE FACE OF EACH GLOBAL SECURITY FOR WHICH THE DEPOSITORY TRUST COMPANY IS TO BE THE DEPOSITARY: 
 UNLESS
THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE ISSUER OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE, OR PAYMENT, AND ANY CERTIFICATE ISSUED IS
REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF
DTC), ANY TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.] 

 CELL THERAPEUTICS, INC. 
 10% CONVERTIBLE SENIOR NOTE DUE SEPTEMBER 15, 2012 
  

				
	No. _____	  	U.S. $	__________________

 CUSIP No. 
 Cell Therapeutics, Inc., a corporation duly organized and existing under the laws of the State of Washington (herein called the “Company,” which term includes any successor Person under the
Indenture referred to on the reverse hereof), for value received, hereby promises to pay to Cede & Co., or registered assigns, the principal sum of ____________ United States Dollars (U.S. $ __________) [if this Security is a
Global Security, then insert — (which principal amount may from time to time be increased or decreased to such other principal amounts (which, taken together with the principal amounts of all other Outstanding Securities, shall not exceed
$__________________ in the aggregate at any time, [by adjustments made on the records of the Trustee hereinafter referred to in accordance with the Indenture)]] on September 15, 2012, unless repurchased on an earlier date. 

 

			
	 Interest Payment Dates:
	  	[        ] and [        ]
		
	 Regular Record Dates:
	  	[        ] and [        ]

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

 IN WITNESS WHEREOF, the Company has caused this Security to be duly executed. 
  

			
	CELL THERAPEUTICS, INC.
		
	By:	 	 
	Name:	 	
	Title:	 	

  

			
	Attest:
	
	 
	Name:
		
	Dated:	 	 
		 	

 This is one of the Securities referred to in the within-mentioned Indenture. 
  

			
	
	 U.S. BANK NATIONAL ASSOCIATION,
 as
Trustee

		
	By:	 	 
		 	Authorized Signatory

  

 2 

 [FORM OF REVERSE] 
 Indenture; Defined Terms. This Security is one of a duly authorized issue of securities of the Company designated as its “10% Convertible Senior Notes due September 15, 2012” (herein
called the “Securities”), limited in aggregate principal amount to U.S. $9,000,000, issued and to be issued under an Indenture dated as of September 15, 2008 (herein called the “Indenture”)
between the Company and U.S. Bank National Association, as Trustee (herein called the “Trustee,” which term includes any successor trustee under the Indenture), to which Indenture and all indentures supplemental thereto
reference is hereby made for a statement of the respective rights, limitations of rights, duties and immunities thereunder of the Company, the Trustee and the Holders of the Securities and of the terms upon which the Securities are, and are to be,
authenticated and delivered. To the extent any provision of this Security conflicts with the express provisions of the Indenture, the provisions of the Indenture shall govern and be controlling. All terms used in this Security which are defined in
the Indenture shall have the meanings assigned to them in the Indenture. 
 Payments of Interest. The Company promises to pay
interest on the principal amount of this Security, from September 15, 2008, or from the most recent Interest Payment Date (as defined below) to which interest has been paid or duly provided for, semiannually in arrears on May 15 and
November 15 in each year (each, an “Interest Payment Date”), commencing November 15, 2008, at the rate of 10% per annum, until the principal hereof is due, and at the rate then in effect on any overdue
principal and premium, if any, and, to the extent permitted by law, on any overdue interest. The interest so payable, and punctually paid or duly provided for, on any Interest Payment Date will, as provided in the Indenture, be paid to the Person in
whose name this Security (or one or more Predecessor Securities) is registered at the close of business on the Regular Record Date for such interest, which shall be May 1 and November 1 (whether or not a Business Day), as the case may be,
next preceding such Interest Payment Date. Any interest not punctually paid or duly provided for shall be payable as provided in the Indenture. 
 Method of Payment. Payment of interest on this Security may be made at the option of the Company as follows: (i) by United States Dollar check mailed to the address of the Person entitled thereto as such address shall
appear in the Security Register or, (ii) upon written application by the Holder to the Security Registrar setting forth wire instructions not later than the relevant Record Date, by wire transfer to a United States dollar account (such a wire
transfer to be made only to a Holder of an aggregate principal amount of Registered Securities in excess of U.S. $2,000,000 and only if such Holder shall have furnished wire instructions in writing to the Trustee no later than 15 days prior to the
relevant payment date) maintained by the payee. 
 Payments of Principal. Payments of principal shall be made upon the
surrender of this Security at the Corporate Trust Office or at such other office or agency of the Company as may be designated by it for such purpose in the Borough of Manhattan, The City of New York, in such coin or currency of the United States of
America as at the time of payment shall be legal tender for the payment of public and private debts, or at such other offices or agencies as the Company may designate, by United States Dollar check drawn on, or wire transfer to, a United States
Dollar account (such a wire transfer to be made only to a Holder of an aggregate principal amount of Registered Securities in excess of U.S. $2,000,000 and only if such Holder shall have furnished wire instructions in writing to the Trustee no
later than 15 days prior to the relevant payment date) maintained by the payee. 

 Sinking Fund. No sinking fund is provided for the Securities. 
 Tax. Except as specifically provided herein and in the Indenture, the Company shall not be required to make any payment with respect to any
tax, assessment or other governmental charge imposed by any government or any political subdivision or taxing authority thereof or therein. 
 In any case where the due date for the payment of the principal of, premium, if any, or interest on any Security or the last day on which a Holder of a Security has a right to convert its Security shall be, at any Place of Payment or Place
of Conversion, as the case may be, a day on which banking institutions at such Place of Payment or Place of Conversion are authorized or obligated by law or executive order to close, then payment of principal, premium, if any, or interest or
delivery for conversion of such Security need not be made on or by such date at such place but may be made on or by the next succeeding day at such place which is not a day on which banking institutions are authorized or obligated by law or
executive order to close, with the same force and effect as if made on the date for such payment or the date fixed for repurchase, or by such last day for conversion, and no interest shall accrue on the amount so payable for the period from and
after such due date. Interest on the Securities shall be computed on the basis of a 360-day year of twelve 30-day months. 
 Conversion
at Option of Holder. Subject to and upon compliance with the provisions of the Indenture, the Holder of this Security is entitled, at its option, at any time after the original issue date of the Securities and on or before the close of
business on September 15, 2012, or in case the Holder of this Security has exercised his right to require the Company to repurchase this Security or such portion hereof, then in respect of this Security until and including, but (unless the
Company defaults in making the payment due upon repurchase) not after, the close of business on the Business Day immediately preceding the Repurchase Date to convert this Security or any portion of the principal amount hereof that is an integral
multiple of U.S. $1,000 into fully paid and nonassessable shares of Common Stock of the Company at the initial Conversion Rate per U.S. $1,000 principal amount of Securities (or at the current adjusted Conversion Rate, if any adjustment
has been made as provided in the Indenture) by surrender of this Security, duly endorsed or assigned to the Company or in blank. 
 In case
such surrender shall be made during the period from the close of business on any Regular Record Date next preceding any Interest Payment Date to the opening of business on such Interest Payment Date (except if this Security or a portion thereof is
repurchasable on a Repurchase Date, with the consequence that the conversion right of such Security would terminate between such Regular Record Date and the close of business on such Interest Payment Date), also accompanied by payment in New York
Clearing House or other funds acceptable to the Company of an amount equal to the interest payable on such Interest Payment Date on the principal amount of this Security then being converted and also the conversion notice hereon duly executed, to
the Company at the Corporate Trust Office, or at such other office or agency of the Company, subject to any laws or regulations applicable thereto and subject to the right of the Company to terminate the appointment of any Conversion Agent (as
defined below) as may be designated by it for such purpose in the Borough of Manhattan, The City of New York, or at such other offices or agencies as the Company may designate. 
  

 A-2 

 The interest so payable on such Interest Payment Date, with respect to any Security (or portion thereof,
if applicable) that is surrendered for conversion during the period from the close of business on any Regular Record Date next preceding any Interest Payment Date to the opening of business on such Interest Payment Date, shall be paid to the Holder
of such Security as of such Regular Record Date. Interest payable in respect of any Security surrendered for conversion on or after an Interest Payment Date shall be paid to the Holder of such Security as of the next preceding Regular Record Date,
notwithstanding the exercise of the right of conversion. 
 Except as provided in this paragraph and subject to the Indenture, no cash
payment or adjustment shall be made upon any conversion on account of any interest accrued from the Interest Payment Date next preceding the conversion date, in respect of any Security (or part thereof, as the case may be) surrendered for
conversion, or on account of any dividends on the Common Stock issued upon conversion. 
 The Company’s delivery to the Holder of the
number of shares of Common Stock (and cash in lieu of fractions thereof, as provided in this Indenture) into which a Security is convertible and any rights pursuant to Section 10.4(m) of the Indenture will be deemed to satisfy the
Company’s obligation to pay the principal amount of the Security. 
 No fractions of shares or scrip representing fractions of shares
will be issued on conversion, but instead of any fractional interest (calculated to the nearest 1/100th of a share) the Company shall pay a cash adjustment as provided in the Indenture. 
 The Conversion Rate is subject to adjustment as provided in the Indenture. In addition, the Indenture provides that in case of certain
consolidations or mergers to which the Company is a party or the conveyance, transfer, sale or lease of all or substantially all of the property and assets of the Company, the Indenture shall be amended, without the consent of any Holders of
Securities, so that this Security, if then Outstanding, will be convertible thereafter, during the period this Security shall be convertible as specified above, only into the kind and amount of securities, cash and other property receivable upon
such consolidation, merger, conveyance, transfer, sale or lease by a holder of the number of shares of Common Stock of the Company into which this Security could have been converted immediately prior to such consolidation, merger, conveyance,
transfer, sale or lease (assuming such holder of Common Stock is not a Constituent Person or an Affiliate of a Constituent Person, failed to exercise any rights of election and received per share the kind and amount received per share by a plurality
of Non-electing Shares). No adjustment in the Conversion Rate will be made until such adjustment would require an increase or decrease of at least one percent of such rate; provided that any adjustment that would otherwise be made will be
carried forward and taken into account in the computation of any subsequent adjustment. 
 Automatic Conversion of
Notes. The Notes will automatically convert (an “Automatic Conversion”) at any time after September 15, 2009 if the Closing Price (as defined in the Indenture) per share of the Common Stock has exceeded two hundred percent
(200%) of the Conversion Price then in effect for at least twenty (20) Trading Days within a period of thirty (30) consecutive Trading Days ending within five (5) Trading Days of the date the Company gives to all holders of Notes
a notice of the Automatic Conversion. The amount of Securities that shall automatically convert for any 30 Trading Day period shall equal the lesser of (i) the value of ten (10) times the Volume Weighted Average Price of the Common Stock
during such 20 day triggering period times the 

  

 A-3 

 
average daily trading volume of the Common Stock during such 20 day period, rounded down to the nearest $1,000, and (ii) one half of the principal
amount of the Securities that have been authenticated under the Indenture as of the date of the Automatic Conversion Notice. Each 30 Trading Day period for which an Automatic Conversion may be triggered shall commence anew at the end of the period
which triggered the Automatic Conversion. 
 The Company, or at its request (which must be received by the Trustee at least five
(5) Business Days prior to the date the Trustee is requested to give notice as described below unless a shorter period is agreed to by the Trustee), the Trustee in the name of and at the expense of the Company, shall send or cause to be sent a
notice of the Automatic Conversion not more than thirty (30) days but not less than five (5) days before the date of effectiveness of the Automatic Conversion as set forth in the Indenture. 
 Make-Whole Payment. Upon the conversion of any Security, the Company will pay to the Holders of the Securities so converted cash with
respect to the Security so converted in an amount equal to U.S. $0.40 per $1.00 principal amount of the Securities, less the amount of any interest paid on the Securities before the relevant Conversion Date. 
 Compensation for Buy-In on Failure to Timely Deliver Certificates Upon Conversion. If the Company fails to deliver to a Holder the
applicable certificate or certificates by the fifth Trading Day following the delivery of the notice of conversion to the Trustee, and if after such date such Holder is required by its brokerage firm to purchase (in an open market transaction or
otherwise), or the Holder’s brokerage firm purchases, shares of Common Stock to deliver in satisfaction of a sale by such Holder of the Conversion Shares which such Holder was entitled to receive upon the conversion relating to such notice of
conversion (a “Buy-In”), then the Company shall (A) pay in cash to such Holder (in addition to any other remedies available to or elected by such Holder) the amount by which (x) such Holder’s total purchase price
(including any brokerage commissions) for the shares of Common Stock so purchased exceeds (y) the product of (1) the aggregate number of shares of Common Stock that such Holder was entitled to receive from the conversion at issue
multiplied by (2) the actual sale price at which the sell order giving rise to such purchase obligation was executed (including any brokerage commissions) and (B) at the option of such Holder, either reissue (if surrendered) Securities
equal to the aggregate principal amount of Securities submitted for conversion or deliver to such Holder the number of shares of Common Stock that would have been issued if the Company had timely complied with its delivery requirements under the
Indenture. 
 Optional Repurchase Upon Change of Control. If a Change in Control occurs, the Holder of this Security, at the
Holder’s option, shall have the right, in accordance with the provisions of the Indenture, to require the Company to repurchase this Security (or any portion of the principal amount hereof that is equal to U.S. $1,000 or any greater integral
multiple of U.S. $1,000) for cash at a Repurchase Price equal to 100% of the principal amount thereof plus interest accrued to, but excluding, the Repurchase Date. 
  

 A-4 

 [The following paragraph shall appear in each Registered Security that is not a Global Security: 
 In the event of repurchase or conversion of this Security in part only, a new Registered Security or Registered Securities for the unrepurchased or
unconverted portion hereof will be issued in the name of the Holder hereof.] 
 Event of Default and Remedies. If an Event
of Default shall occur and be continuing, the principal of all the Securities, together with accrued and unpaid interest, if any, to the date of declaration, may be declared due and payable in the manner and with the effect provided in the
Indenture. 
 As provided in and subject to the provisions of the Indenture, the Holder of this Security shall not have the right to
institute any proceeding with respect to the Indenture or for the appointment of a receiver or trustee or for any other remedy thereunder, unless such Holder shall have previously given the Trustee written notice of a continuing Event of Default,
the Holders of not less than $1,000,000 in aggregate principal amount of the Outstanding Securities shall have made written request to the Trustee to institute proceedings in respect of such Event of Default as Trustee and furnished the Trustee
reasonable indemnity, the Trustee shall have failed to institute any such proceeding for 30 days after receipt of such notice, request and offer of indemnity, and the Trustee has not received any direction inconsistent with such written request from
the Holders of a majority of the aggregate principal amount of the Outstanding Securities during such 30 day period. The foregoing shall not apply to any suit instituted by the Holder of this Security for the enforcement of any payment of principal
hereof, premium, if any, Make-Whole Payment, if any, or interest hereon on or after the respective due dates expressed herein or for the enforcement of the right to convert or repurchase this Security as provided in the Indenture. 
 Amendment, Supplement and Waiver. The Indenture permits, with certain exceptions as therein provided, the amendment thereof and the
modification of the rights and obligations of the Company and the rights of the Holders of the Securities under the Indenture at any time by the Company and the Trustee with the written consent of the Holders of a majority in principal amount of the
Securities at the time Outstanding. The Indenture also contains provisions permitting the Holders of specified percentages in principal amount of the Securities at the time Outstanding, on behalf of the Holders of all the Securities, to waive
compliance by the Company with certain provisions of the Indenture and certain past defaults under the Indenture and their consequences. Any such consent or waiver by the Holder of this Security shall be conclusive and binding upon such Holder and
upon all future Holders of this Security and of any Security issued in exchange herefor or in lieu hereof, whether or not notation of such consent or waiver is made upon this Security or such other Security. 
 Denominations; Transfer; Exchange. As provided in the Indenture and subject to certain limitations therein set forth, the transfer of
Registered Securities is registrable on the Security Register upon surrender of a Registered Security for registration of transfer at the Corporate Trust Office of the Trustee or at such other office or agency of the Company as may be designated by
it for such purpose in the Borough of Manhattan, The City of New York, or at such other offices or agencies as the Company may designate, duly endorsed by, or accompanied by a written instrument of transfer in form satisfactory to the Company and
the Security Registrar duly executed by, the Holder thereof or his attorney duly authorized in writing, and thereupon one or more new Registered Securities, of authorized denominations and for the same aggregate principal amount, will be issued to
the designated transferee or transferees by the Registrar. No service charge shall be made for any such registration of transfer or exchange, but the Company may require payment of a sum sufficient to recover any tax or other governmental charge
payable in connection therewith. 
  

 A-5 

 [The following paragraph shall appear in each Global Security: 
 In the event of a deposit or withdrawal of an interest in this Security, including an exchange, transfer, repurchase or conversion of this Security
in part only, the Trustee, as custodian of the Depositary, shall make an adjustment on its records to reflect such deposit or withdrawal in accordance with the Applicable Procedures.] 
 Persons Deemed Owners. Prior to due presentation of a Registered Security for registration of transfer, the Company, the Trustee and any
agent of the Company or the Trustee may treat the Person in whose name such Registered Security is registered as the owner thereof for all purposes, whether or not such Security be overdue, and neither the Company, the Trustee nor any such agent
shall be affected by notice to the contrary. 
 Governing Law. The Indenture and this Security shall be governed by and
construed in accordance with the laws of the State of New York, United States of America, including, without limitation, Section 5-1401 of the New York General Obligations Law. 
 Authentication. Unless the certificate of authentication has been executed by the Trustee or an Authenticating Agent by the manual
signature of one of their respective authorized signatories, this Security shall not be entitled to any benefit under the Indenture or be valid or obligatory for any purpose. 
  

 A-6 

 EXHIBIT B 
 ELECTION OF HOLDER TO REQUIRE REPURCHASE 
 1. Pursuant to Section 12.1 of the Indenture, the
undersigned hereby elects to have the principal amount of this Security set forth below repurchased by the Company. 
 2. The undersigned
hereby directs the Trustee or the Company to pay it or an amount in cash equal to 100% of the principal amount to be repurchased (as set forth below), plus interest accrued to the Repurchase Date. 
  

			
	Dated: _______________
	
	 
	Signature
	
	Signature Guaranteed
	
	 

  

	
	Principal amount to be repurchased:
	
	  
	(must be equal to U.S. $1,000 or any greater integral multiple of U.S. $1,000):
	
	Remaining principal amount following such repurchase:
	
	 

 NOTICE: The signature to the foregoing election must correspond to the name as written upon the face of
this Security in every particular, without alteration or any change whatsoever. 
  

 B-1 

 EXHIBIT C 
 CONVERSION NOTICE 
 The undersigned Holder of this Security hereby irrevocably exercises the option
to convert this Security, or any portion of the principal amount hereof below designated, into shares of Common Stock in accordance with the terms of the Indenture referred to in this Security and directs that such shares, together with a check in
payment for any fractional share and any Securities representing any unconverted principal amount hereof, be delivered to and be registered in the name of the undersigned unless a different name has been indicated below. If shares of Common Stock or
Securities are to be registered in the name of a Person other than the undersigned, the undersigned will pay all transfer taxes payable with respect thereto. Any amount required to be paid by the undersigned on account of interest accompanies this
Security. 
  

					
			
	Dated: ___________________	 		 	  
		 		 	Signature

  

			
	If shares or Registered Securities are registered in the name of a Person other than the Holder, please print such Person’s name and address	  	If only a portion of the Securities is to be to be converted, please indicate:
		
	 	  	 1.      Principal amount to be converted:

		
	 	  	 U.S. $_________________

	Address	  	
		
	 	  	
	 Social Security or other Taxpayer
 Identification Number,
if any
	  	 2.      Principal amount and denomination of Registered Securities representing unconverted principal amount to
be issued:

	 	  	
	Signature Guaranteed	  	 Amount: U.S. $_______________

  

 C-1Securities Purchase Agreement

 Exhibit 10.1 
 SECURITIES PURCHASE AGREEMENT 
 This Securities Purchase Agreement (this
“Agreement”) is dated as of September 15, 2008, between Cell Therapeutics, Inc., a Washington corporation (the “Company”), and Enable Growth Partners LP (“Enable”). Enable Opportunity Partners
LP and Pierce Diversified Master Strategy Fund LLC, Ena (together, the “Enable Affiliates”) are also parties hereto for purposes of Sections 4.13, 4.14 and 4.15. 
 WHEREAS, subject to the terms and conditions set forth in this Agreement and pursuant to an effective registration statement under the Securities Act,
the Company desires to issue and sell to Enable, and Enable desires to purchase from the Company, securities of the Company as more fully described in this Agreement. 
 WHEREAS, subject to the terms and conditions set forth in this Agreement, Enable and the Company desire to resolve the Enable Claims (as defined below), as described more fully in this Agreement. 
 NOW, THEREFORE, IN CONSIDERATION of the mutual covenants contained in this Agreement, and for other good and valuable consideration the receipt and
adequacy of which are hereby acknowledged, the Company and Enable agree as follows: 
 ARTICLE I. 
 DEFINITIONS 
 1.1 Definitions In
addition to the terms defined elsewhere in this Agreement, the following terms have the meanings set forth in this Section 1.1: 
 “Action” shall have the meaning ascribed to such term in Section 3.1(j). 
 “Affiliate” means any Person that, directly or indirectly through one or more intermediaries, controls or is controlled by or is under common control with a Person as such terms are used in and construed under Rule 144
under the Securities Act. With respect to Enable, any investment fund or managed account that is managed on a discretionary basis by the same investment manager as Enable will be deemed to be an Affiliate of Enable. 
 “B Convertible Notes” means the Series B 10% Convertible Senior Notes of the Company to be issued under a Trust Indenture
between the Company and US Bank National Association as Trustee, and of like tenor as the Convertible Notes except for the issuance date being the Option Closing Date and the maturity date being the fifth anniversary of the Option Closing Date.

 “B Underlying Shares” means the shares of Common Stock issued and issuable upon conversion of the B
Convertible Notes. 
 “Business Day” means any day except Saturday, Sunday, any day which shall be a federal
legal holiday in the United States or any day on which banking institutions in the State of New York are authorized or required by law or other governmental action to close. 
  

 1 

 “Closing” means the closing of the purchase and sale of the Convertible
Notes pursuant to Section 2.1. 
 “Closing Date” means September 15, 2008. 
 “Commission” means the Securities and Exchange Commission. 
 “Common Stock” means the common stock of the Company, no par value per share, and any other class of securities into
which such securities may hereafter be reclassified or changed into. 
 “Common Stock Equivalents” means any
securities of the Company or the Subsidiaries which would entitle the holder thereof, pursuant to the terms of such securities, to acquire at any time Common Stock, including, without limitation, any debt, preferred stock, rights, options, warrants
or other instrument that is at any time convertible into or exercisable or exchangeable for, or otherwise entitles the holder thereof to receive, Common Stock. 
 “Company Counsel” means Heller Ehrman LLP with offices located at 333 Bush Street, San Francisco, California 94104.

 “Conversion Price” shall have the meaning ascribed to such term in the Indenture. 
 “Convertible Notes” means the 10% Convertible Senior Notes of the Company due September 15, 2012 issued under that
certain Trust Indenture dated September 15, 2008 between the Corporation and US Bank National Association as Trustee. 
 “Enable Claims” means any and all claims for any relief whatsoever that have been alleged, or that could have been alleged, by Enable and/or the Enable Affiliates in Enable Growth Partners, LP, et al. v. Cell
Therapeutics, Inc., N.Y. Sup. Ct., Index No. 600206-08. 
 “Enable Party” shall have the meaning
ascribed to such term in Section 4.6. 
 “Exchange Act” means the Securities Exchange Act of 1934, as
amended, and the rules and regulations promulgated thereunder. 
 “Exempt Issuance” means equity issuances
for service provider compensation, or pursuant to the terms of pre-Closing (or, as the case may be, pre-Option Closing) derivative securities and contracts, or for acquisitions or corporate partnering. 
 “FWS” means Feldman Weinstein & Smith LLP with offices located at 420 Lexington Avenue, Suite 2620, New York,
New York 10170-0002. 
 “GAAP” shall have the meaning ascribed to such term in Section 3.1(h).

  

 2 

 “Indebtedness” means (a) any liabilities for borrowed money or
amounts owed in excess of $250,000 (other than trade accounts payable incurred in the ordinary course of business), (b) all guaranties, endorsements and other contingent obligations in respect of Indebtedness of others, whether or not the same
are or should be reflected in the Company’s balance sheet (or the notes thereto), except guaranties by endorsement of negotiable instruments for deposit or collection or similar transactions in the ordinary course of business; and (c) the
present value of any lease payments in excess of $250,000 due under leases required to be capitalized in accordance with GAAP. 
 “Indenture” means the Trust Indenture to be dated September 15, 2008 between the Company and US Bank National Association as Trustee pursuant to which the Convertible Notes are being issued. 
 “Intellectual Property Rights” shall have the meaning ascribed to such term in Section 3.1(o). 
 “Liens” means a lien, charge, security interest, encumbrance, right of first refusal, preemptive right or other
restriction. 
 “Material Adverse Effect” shall have the meaning assigned to such term in
Section 3.1(b). 
 “Material Permits” shall have the meaning ascribed to such term in
Section 3.1(l). 
 “Option” means the option of the Company set forth in Section 5.1 to require the
purchase by Enable from the Company of, and the sale by the Company to Enable of, $9,000,000 principal amount of B Convertible Notes for $9,000,000 cash on the Option Closing Date. 
 “Option Closing” means the closing of the purchase and sale of the B Convertible Notes pursuant to Article V. 

“Option Closing Date” means the second Business Day after the Company exercises the Option under Section 5.1,
provided that all conditions precedent to (i) Enable’s obligations to pay the Subscription Amount and (ii) the Company’s obligations to deliver the Securities have been satisfied or waived on or before such date. 
 “Person” means an individual or corporation, partnership, trust, incorporated or unincorporated association, joint
venture, limited liability company, joint stock company, government (or an agency or subdivision thereof) or other entity of any kind. 
 “Proceeding” means an action, claim, suit, investigation or proceeding. 
 “Prospectus” means the final prospectus filed for the Registration Statement. 
 “Prospectus
Supplement” means the supplement to the Prospectus complying with Rule 424(b) of the Securities Act to be filed with the Commission and delivered by the Company to Enable at the Closing. 
  

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 “Registration Statement” means the effective registration statement with
Commission file No. 333-149982 which registers the sale of the Convertible Notes, the B Convertible Notes, the Underlying Shares, and the B Underlying Shares to Enable. 
 “Required Approvals” shall have the meaning ascribed to such term in Section 3.1(e). 
 “Rule 144” means Rule 144 promulgated by the Commission pursuant to the Securities Act, as such Rule may be amended from
time to time, or any similar rule or regulation hereafter adopted by the Commission having substantially the same effect as such Rule. 
 “SEC Reports” shall have the meaning ascribed to such term in Section 3.1(h). 
 “Securities” means the Convertible Notes, the B Convertible Notes, the Underlying Shares, and the B Underlying Shares. 
 “Securities Act” means the Securities Act of 1933, as amended, and the rules and regulations promulgated thereunder. 
 “Series C Preferred Stock” means the Company’s 3% Series C Convertible Preferred Stock. 
 “Short Sales” shall include all “short sales” as defined in Rule 200 of Regulation SHO under the Exchange Act
(but shall be deemed to not include the location and/or reservation of borrowable shares of Common Stock).
 “Subscription Amount” means, as to Enable, (a) as to the Convertible Notes: the aggregate amount to be paid for the Convertible Notes purchased hereunder as specified below Enable’s name on the signature page of
this Agreement and next to the heading “Subscription Amount,” in United States dollars and in immediately available funds, which amount shall be 100% of the principal amount of Convertible Note to be issued; and (b) as to the B
Convertible Notes, if applicable: the aggregate amount to be paid for the B Convertible Notes purchased hereunder as specified below Enable’s name on the signature page of this Agreement and next to the heading “Option Subscription
Amount,” in United States dollars and in immediately available funds, which amount shall be 100% of the principal amount of B Convertible Note to be issued. 
 “Trading Day” means a day on which the Common Stock is traded on a Trading Market. 
 “Trading Market” means the following markets or exchanges on which the Common Stock is listed or quoted for trading on
the date in question: the American Stock Exchange, the Nasdaq Capital Market, the Nasdaq Global Market, the Nasdaq Global Select Market, the MTA (Milan, Italy) or the New York Stock Exchange. 
  

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 “Transaction Documents” means this Agreement, the Indenture, the
Warrants and any other documents or agreements executed in connection with the transactions contemplated hereunder. 
 “Underlying Shares” means the shares of Common Stock issued and issuable upon conversion of the Convertible Notes in accordance with the Indenture. 
 ARTICLE II. 
 PURCHASE AND SALE 
 2.1 Closing. On the Closing Date, upon the terms and subject to the conditions set forth herein, the Company agrees to sell, and Enable agrees to
purchase, for $9,000,000 cash, Convertible Notes with a principal amount equal to $9,000,000. Enable shall deliver to the Trustee via wire transfer immediately available funds equal to its Subscription Amount and the Company shall deliver or cause
the Trustee to deliver to Enable its Convertible Notes pursuant to Section 2.2(a) and the other items set forth in Section 2.2 issuable at the Closing. Upon satisfaction of the conditions set forth in Sections 2.2 and 2.3, the Closing
shall occur at the offices of FWS or such other location as the parties shall mutually agree. 
 2.2 Deliveries. 
 (a) On or prior to the Closing Date, the Company shall deliver or cause to be delivered to Enable the following: 
 (i) this Agreement duly executed by the Company; 
 (ii) a legal opinion of Company Counsel, substantially in the form of Exhibit A attached hereto; 
 (iii) a Convertible Note in the principal amount of $9,000,000, registered in the name of Enable; 
 (iv) the executed Paying Agent Agreement; and 
 (v) the Prospectus and Prospectus Supplement (unless the conditions set forth under Rule 172 under the Securities Act have been
satisfied). 
 (b) Enable shall deliver or cause to be delivered to the Company this Agreement duly executed by Enable; and on
or before the Closing Date, Enable’s Subscription Amount by wire transfer to the Trustee’s account as specified in writing by the Company. 
 2.3 Closing Conditions. 
 (a) The obligations of the Company hereunder in connection
with the Closing as to Enable are subject to the following conditions being met: 
 (i) the accuracy in all material respects
when made and on the Closing Date of the representations and warranties of Enable contained herein; 
  

 5 

 (ii) all obligations, covenants and agreements of Enable required to be performed at or
prior to the Closing Date shall have been performed; and 
 (iii) the delivery by Enable of the items set forth in
Section 2.2(b) of this Agreement. 
 (b) The respective obligations of Enable hereunder in connection with the Closing
are subject to the following conditions being met: 
 (i) the accuracy in all material respects when made and on the Closing
Date of the representations and warranties of the Company contained herein; 
 (ii) all obligations, covenants and agreements
of the Company required to be performed at or prior to the Closing Date shall have been performed; 
 (iii) the delivery by
the Company of the items set forth in Section 2.2(a) of this Agreement; 
 (iv) there shall have been no Material Adverse
Effect with respect to the Company since the date hereof; and 
 (v) from the date hereof to the Closing Date, trading in the
Common Stock shall not have been suspended by the Commission or the Company’s principal Trading Market (except for any suspension of trading of limited duration agreed to by the Company, which suspension shall be terminated prior to the
Closing), and, at any time prior to the Closing Date, trading in securities generally as reported by Bloomberg L.P. shall not have been suspended or limited, or minimum prices shall not have been established on securities whose trades are reported
by such service, or on any Trading Market, nor shall a banking moratorium have been declared either by the United States or New York State authorities nor shall there have occurred any material outbreak or escalation of hostilities or other national
or international calamity of such magnitude in its effect on, or any material adverse change in, any financial market which, in each case, in the reasonable judgment of Enable, makes it impracticable or inadvisable to purchase the Convertible Notes
at the Closing. 
 ARTICLE III. 
 REPRESENTATIONS AND WARRANTIES 
 3.1 Representations and Warranties of the Company. Except as set forth in the Prospectus or
the Prospectus Supplement or the SEC Reports, which Prospectus and Prospectus Supplement and SEC Reports shall be deemed to qualify any representation or warranty otherwise made herein to the extent of such disclosure, the Company hereby makes the
representations and warranties set forth below to Enable as of the date hereof and as of the Closing Date and, if applicable, as of the Option Closing Date: 
 (a) Subsidiaries. Other than CTI Commercial LLC, all of the direct and indirect subsidiaries (each, including CTI Commercial LLC, a
“Subsidiary”) of the Company are set forth on the Company’s most recently filed Form 10-K. The Company owns, directly or indirectly, all of the capital stock or other equity interests of each Subsidiary free and clear of any
Liens, and all the issued and outstanding shares of capital stock of each Subsidiary are validly issued and are fully paid, non-assessable and free of preemptive and similar rights to subscribe for or purchase securities. 
  

 6 

 (b) Organization and Qualification. The Company and each of the Subsidiaries is an
entity duly incorporated or otherwise organized, validly existing and in good standing under the laws of the jurisdiction of its incorporation or organization (as applicable), with the requisite power and authority to own and use its properties and
assets and to carry on its business as currently conducted. Neither the Company nor any Subsidiary is in violation or default of any of the provisions of its respective certificate or articles of incorporation, bylaws or other organizational or
charter documents. Each of the Company and the Subsidiaries is duly qualified to conduct business and is in good standing as a foreign corporation or other entity in each jurisdiction in which the nature of the business conducted or property owned
by it makes such qualification necessary, except where the failure to be so qualified or in good standing, as the case may be, could not have or reasonably be expected to result in (i) a material adverse effect on the legality, validity or
enforceability of any Transaction Document, (ii) a material adverse effect on the results of operations, assets, business or condition (financial or otherwise) of the Company and the Subsidiaries, taken as a whole, or (iii) a material
adverse effect on the Company’s ability to perform in any material respect on a timely basis its obligations under any Transaction Document (any of (i), (ii) or (iii), a “Material Adverse Effect”) and no Proceeding has
been instituted in any such jurisdiction revoking, limiting or curtailing or seeking to revoke, limit or curtail such power and authority or qualification. 
 (c) Authorization; Enforcement. The Company has the requisite corporate power and authority to enter into and to consummate the transactions contemplated by each of the Transaction Documents and otherwise to
carry out its obligations hereunder and thereunder. The execution and delivery of each of the Transaction Documents by the Company and the consummation by it of the transactions contemplated hereby and thereby have been duly authorized by all
necessary action on the part of the Company and no further action is required by the Company, its board of directors or its stockholders in connection therewith other than in connection with the Required Approvals. Each Transaction Document has been
(or upon delivery will have been) duly executed by the Company and, when delivered in accordance with the terms hereof and thereof, will constitute the valid and binding obligation of the Company enforceable against the Company in accordance with
its terms except (i) as limited by applicable bankruptcy, insolvency, reorganization, moratorium and other laws of general application affecting enforcement of creditors’ rights generally and (ii) as limited by laws relating to the
availability of specific performance, injunctive relief or other equitable remedies. 
 (d) No Conflicts. The
execution, delivery and performance of the Transaction Documents by the Company, the issuance and sale of the Securities and the consummation by the Company of the other transactions contemplated hereby and 

  

 7 

 
thereby do not and will not (i) conflict with or violate any provision of the Company’s or any Subsidiary’s certificate or articles of
incorporation, bylaws or other organizational or charter documents, or (ii) conflict with, or constitute a default (or an event that with notice or lapse of time or both would become a default) under, result in the creation of any Lien upon any
of the properties or assets of the Company or any Subsidiary, or give to others any rights of termination, amendment, acceleration or cancellation (with or without notice, lapse of time or both) of, any agreement, credit facility, debt or other
instrument (evidencing a Company or Subsidiary debt or otherwise) or other understanding to which the Company or any Subsidiary is a party or by which any property or asset of the Company or any Subsidiary is bound or affected or (iii) subject
to the Required Approvals, conflict with or result in a violation of any law, rule, regulation, order, judgment, injunction, decree or other restriction of any court or governmental authority to which the Company or a Subsidiary is subject
(including federal and state securities laws and regulations), or by which any property or asset of the Company or a Subsidiary is bound or affected, except in the case of each of clauses (ii) and (iii), such as could not have or reasonably be
expected to result in a Material Adverse Effect. 
 (e) Filings, Consents and Approvals. The Company is not required to
obtain any consent, waiver, authorization or order of, give any notice to, or make any filing or registration with, any court or other federal, state, local or other governmental authority or other Person or other entity of any kind, including,
without limitation, any Trading Market, in connection with the execution, delivery and performance by the Company of the Transaction Documents, other than such as have already been accomplished and other than any filings required to be made under
applicable federal and state securities laws (collectively, the “Required Approvals”). 
 (f) Issuance of
the Securities. The Convertible Notes and the B Convertible Notes are duly authorized and, when issued and paid for in accordance with the applicable Transaction Documents, will be duly and validly issued, fully paid and nonassessable, free and
clear of all Liens imposed by the Company. The Underlying Shares are duly authorized and, when issued in accordance with the terms of the Convertible Notes, will be validly issued, fully paid and nonassessable, free and clear of all Liens imposed by
the Company. The B Convertible Notes are duly authorized and, when issued in accordance with the terms of the Option, will be validly issued, fully paid and nonassessable, free and clear of all Liens imposed by the Company. The B Underlying Shares
are duly authorized and, when issued in accordance with the terms of the B Convertible Notes, will be validly issued, fully paid and nonassessable, free and clear of all Liens imposed by the Company. The Company has reserved from its duly authorized
capital stock the shares of Common Stock issuable upon conversion of the Convertible Notes and the B Convertible Notes. The Securities are being issued pursuant to the Registration Statement and the issuance of the Securities has been registered by
the Company under the Securities Act. The Registration Statement is effective and available for the issuance of the Securities thereunder and the Company has not received any notice that the Commission has issued or intends to issue a stop-order
with respect to the Registration Statement or that the Commission otherwise has suspended or withdrawn the effectiveness of the Registration Statement, either temporarily or permanently, or intends or has threatened in writing to do so. The
“Plan of Distribution” section under the 

  

 8 

 
Registration Statement permits the issuance of the Securities hereunder. Upon receipt and conversion of the Convertible Notes, Enable will have good and
marketable title to such Securities and the Underlying Shares will (if any Common Stock is then listed on the Trading Market) be freely tradable on the Trading Market. Upon receipt and conversion of the B Convertible Notes, Enable will have good and
marketable title to such Securities and the B Underlying Shares will (if any Common Stock is then listed on the Trading Market) be freely tradable on the Trading Market. At the time the Registration Statement and any amendments thereto became
effective, at the date of this Agreement and at the Closing Date, and, if applicable, at the Option Closing Date, the Registration Statement and any amendments thereto conformed and will conform in all material respects to the requirements of the
Securities Act and did not and will not contain any untrue statement of a material fact or omit to state any material fact required to be stated therein or necessary to make the statements therein not misleading; and the Prospectus and any
amendments or supplements thereto, at the time the Prospectus or any amendment or supplement thereto was issued and at the Closing Date, and, if applicable, at the Option Closing Date, conformed and will conform in all material respects to the
requirements of the Securities Act and did not and will not contain any untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in light of the circumstances under which they were made,
not misleading. 
 (g) Capitalization. The capitalization of the Company is substantially as set forth in, or as
incorporated by reference into, the Registration Statement. Except as set forth in the SEC Reports, the Company has not issued any capital stock since its most recently filed periodic report under the Exchange Act, other than pursuant to the
exercise of employee stock options under the Company’s stock option plans, the issuance of shares of Common Stock to employees pursuant to the Company’s employee stock purchase plan and pursuant to the conversion or exercise of Common
Stock Equivalents outstanding as of the date of the most recently filed periodic report under the Exchange Act. No Person has any right of first refusal, preemptive right, right of participation or any similar right to participate in the
transactions contemplated by the Transaction Documents. Except as a result of the purchase and sale of the Securities, there are no outstanding options, warrants, scrip rights to subscribe to, calls or commitments of any character whatsoever
relating to, or securities, rights or obligations convertible into or exercisable or exchangeable for, or giving any Person any right to subscribe for or acquire, any shares of Common Stock, or contracts, commitments, understandings or arrangements
by which the Company or any Subsidiary is or may become bound to issue additional shares of Common Stock or Common Stock Equivalents. The issuance and sale of the Securities will not obligate the Company to issue shares of Common Stock or other
securities to any Person (other than Enable) and will not result in a right of any holder of Company securities to adjust the exercise, conversion, exchange or reset price under any of such securities. All of the outstanding shares of capital stock
of the Company are validly issued, fully paid and nonassessable, have been issued in compliance with all federal and state securities laws, and none of such outstanding shares was issued in violation of any preemptive rights or similar rights to
subscribe for or purchase securities. No further approval or authorization of any stockholder, the Board of Directors of the Company or others is required for the issuance and sale of the Securities. There are no stockholders agreements, voting
agreements or other similar agreements with respect to the Company’s capital stock to which the Company is a party or, to the knowledge of the Company, between or among any of the Company’s stockholders. 
  

 9 

 (h) SEC Reports; Financial Statements. The Company has complied in all material
respects with requirements to file all reports, schedules, forms, statements and other documents required to be filed by it under the Securities Act and the Exchange Act, including pursuant to Section 13(a) or 15(d) thereof, for the two years
preceding the date hereof (the foregoing materials, including the exhibits thereto and documents incorporated by reference therein being collectively referred to herein as the “SEC Reports”) on a timely basis or has received a valid
extension of such time of filing and has filed any such SEC Reports prior to the expiration of any such extension. As of their respective dates, the SEC Reports complied in all material respects with the requirements of the Securities Act and the
Exchange Act and none of the SEC Reports, when filed, contained any untrue statement of a material fact or omitted to state a material fact required to be stated therein or necessary in order to make the statements therein, in the light of the
circumstances under which they were made, not misleading. The financial statements of the Company included in the SEC Reports comply in all material respects with applicable accounting requirements and the rules and regulations of the Commission
with respect thereto as in effect at the time of filing. Such financial statements have been prepared in accordance with United States generally accepted accounting principles (“GAAP”) applied on a consistent basis during the
periods involved, except as may be otherwise specified in such financial statements or the notes thereto and except that unaudited financial statements may not contain all footnotes required by GAAP, and fairly present in all material respects the
financial position of the Company and its consolidated subsidiaries as of and for the dates thereof and the results of operations and cash flows for the periods then ended, subject, in the case of unaudited statements, to normal, immaterial,
year-end audit adjustments. 
 (i) Material Changes; Undisclosed Events, Liabilities or Developments. Since the date of
the latest audited financial statements included within the SEC Reports, except as specifically disclosed in the SEC Reports or the Prospectus Supplement, (i) there has been no event, occurrence or development that has had or that could
reasonably be expected to result in a Material Adverse Effect, (ii) the Company has not incurred any liabilities (contingent or otherwise) other than (A) trade payables and accrued expenses incurred in the ordinary course of business
consistent with past practice and (B) liabilities not required to be reflected in the Company’s financial statements pursuant to GAAP or required to be disclosed in filings made with the Commission, (iii) the Company has not altered
its method of accounting, (iv) the Company has not declared or made any dividend or distribution of cash or other property (other than Common Stock) to its stockholders or purchased, redeemed or made any agreements to purchase or redeem any
shares of its capital stock and (v) the Company has not issued any equity securities to any officer, director or Affiliate, except pursuant to existing Company stock option plans. The Company does not have pending before the Commission any
request for confidential treatment of information. Except for the issuance of the Securities contemplated by this Agreement or as set forth in the Prospectus Supplement, no event, liability or development has occurred or exists with respect to the
Company or its Subsidiaries or 

  

 10 

 
their respective business, properties, operations or financial condition, that would be required to be disclosed by the Company under applicable securities
laws at the time this representation is made that has not been publicly disclosed at least 1 Business Day prior to the date that this representation is made. 
 (j) Litigation. Except as disclosed in the Registration Statement or the Prospectus Supplement, there is no Proceeding pending or,
to the knowledge of the Company, threatened against or affecting the Company, any Subsidiary or any of their respective properties before or by any court, arbitrator, governmental or administrative agency or regulatory authority (federal, state,
county, local or foreign) (collectively, an “Action”) which (i) adversely affects or challenges the legality, validity or enforceability of any of the Transaction Documents or the Securities or (ii) could, if there were an
unfavorable decision, reasonably be expected to result in a Material Adverse Effect. Except as disclosed in the Registration Statement or the Prospectus Supplement, neither the Company nor any Subsidiary, nor any director or officer thereof, is or
has been the subject of any Action involving a claim of violation of or liability under federal or state securities laws or a claim of breach of fiduciary duty. There has not been, and to the knowledge of the Company, there is not pending or
contemplated, any investigation by the Commission involving the Company or any current or former director or officer of the Company. The Commission has not issued any stop order or other order suspending the effectiveness of any registration
statement filed by the Company or any Subsidiary under the Exchange Act or the Securities Act. 
 (k) Labor Relations.
No material labor dispute exists or, to the knowledge of the Company, is imminent with respect to any of the employees of the Company which could reasonably be expected to result in a Material Adverse Effect. The Company and its Subsidiaries believe
that their relationships with their employees are good. No executive officer, to the knowledge of the Company, is, or is now expected to be, in violation of any material term of any employment contract, confidentiality, disclosure or proprietary
information agreement or non-competition agreement, or any other contract or agreement or any restrictive covenant, and the continued employment of each such executive officer does not subject the Company or any of its Subsidiaries to any liability
with respect to any of the foregoing matters. The Company and its Subsidiaries are in compliance with all U.S. federal, state, local and foreign laws and regulations relating to employment and employment practices, terms and conditions of employment
and wages and hours, except where the failure to be in compliance could not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect. 
 (l) Compliance. Neither the Company nor any Subsidiary (i) is in default under or in violation of (and no event has occurred
that has not been waived that, with notice or lapse of time or both, would result in a default by the Company or any Subsidiary under), nor has the Company or any Subsidiary received notice of a claim that it is in default under or that it is in
violation of, any indenture, loan or credit agreement or any other agreement or instrument to which it is a party or by which it or any of its properties is bound (whether or not such default or violation has been waived), (ii) is in violation
of any order of any court, arbitrator or governmental body, or (iii) is or has been in violation of any statute, rule or regulation of any governmental authority, including without limitation all foreign, federal, state and local laws
applicable to its business and all such laws that affect the environment, except in each case as could not reasonably be expected to have a Material Adverse Effect. 
  

 11 

 (m) Regulatory Permits. The Company and the Subsidiaries possess all certificates,
authorizations and permits issued by the appropriate federal, state, local or foreign regulatory authorities necessary to conduct their respective businesses as described in the SEC Reports, except where the failure to possess such permits could not
have or reasonably be expected to result in a Material Adverse Effect (“Material Permits”), and neither the Company nor any Subsidiary has received any notice of proceedings relating to the revocation or modification of any Material
Permit. 
 (n) Title to Assets. The Company and the Subsidiaries have good and marketable title in fee simple to all
real property owned by them that is material to the business of the Company and the Subsidiaries and good and marketable title in all personal property owned by them that is material to the business of the Company and the Subsidiaries, in each case
free and clear of all Liens, except for Liens as do not materially affect the value of such property and do not materially interfere with the use made and proposed to be made of such property by the Company and the Subsidiaries and Liens for the
payment of federal, state or other taxes, the payment of which is neither delinquent nor subject to penalties. Any real property and facilities held under lease by the Company and the Subsidiaries are held by them under valid, subsisting and
enforceable leases with which the Company and the Subsidiaries are in compliance. 
 (o) Patents and Trademarks. The
Company and the Subsidiaries have, or have rights to use, all patents, patent applications, trademarks, trademark applications, service marks, trade names, trade secrets, inventions, copyrights, licenses and other similar intellectual property
rights currently employed by them in connection with the business currently operated by them that are necessary for use in the conduct of their respective businesses as described in the SEC Reports, except where the failure to so have could not
reasonably be expected to have a Material Adverse Effect (collectively, the “Intellectual Property Rights”). Neither the Company nor any Subsidiary has received any written notice that the Intellectual Property Rights used by the
Company or any Subsidiary violates or infringes upon the rights of any Person. 
 (p) Insurance. The Company and the
Subsidiaries are insured by insurers of recognized financial responsibility against such losses and risks and in such amounts as are prudent and customary in the businesses in which the Company and the Subsidiaries are engaged, including, but not
limited to, directors and officers insurance coverage. To the best knowledge of the Company, such insurance contracts are accurate and complete. Neither the Company nor any Subsidiary has any reason to believe that it will not be able to renew its
existing insurance coverage as and when such coverage expires or to obtain similar coverage from similar insurers as may be necessary to continue its business without a significant increase in cost. 
  

 12 

 (q) Transactions With Affiliates and Employees. Except as set forth in the SEC
Reports, none of the officers or directors of the Company and, to the knowledge of the Company, none of the employees of the Company is presently a party to any transaction with the Company or any Subsidiary (other than for services as employees,
officers and directors), including any contract, agreement or other arrangement providing for the furnishing of services to or by, providing for rental of real or personal property to or from, or otherwise requiring payments to or from any officer,
director or such employee or, to the knowledge of the Company, any entity in which any officer, director, or any such employee has a substantial interest or is an officer, director, trustee or partner, other than for (i) payment of salary or
consulting fees for services rendered, (ii) reimbursement for expenses incurred on behalf of the Company and (iii) other employee benefits, including restricted stock programs and stock option agreements under any stock option plan of the
Company. 
 (r) Sarbanes-Oxley. The Company is in material compliance with all provisions of the Sarbanes-Oxley Act of
2002 which are applicable to it as of the date hereof and of the Closing Date. 
 (s) Certain Fees. Except as set forth
in the Prospectus Supplement, no brokerage or finder’s fees or commissions are or will be payable by the Company to any broker, financial advisor or consultant, finder, placement agent, investment banker, bank or other Person with respect to
the transactions contemplated by the Transaction Documents. 
 (t) Investment Company. The Company is not, and
immediately after receipt of payment for the Securities will not be, an “investment company” within the meaning of the Investment Company Act of 1940, as amended. 
 (u) Registration Rights. No Person has any right to cause the Company to effect the registration under the Securities Act of any
securities of the Company, which rights are currently not satisfied. 
 (v) Listing and Maintenance Requirements. The
Company’s Common Stock is registered pursuant to Section 12(b) or 12(g) of the Exchange Act, and the Company has taken no action designed to, or which to its knowledge is likely to have the effect of, terminating the registration of the
Common Stock under the Exchange Act nor has the Company received any notification that the Commission is contemplating terminating such registration. Except as disclosed in the SEC Reports, the Company has not, in the 12 months preceding the
date hereof, received notice from any Trading Market on which the Common Stock is or has been listed or quoted to the effect that the Company is not in compliance with the listing or maintenance requirements of such Trading Market. 
 (w) Application of Takeover Protections. The Company and its Board of Directors have taken all necessary action, if any, in order
to render inapplicable any control share acquisition, business combination, poison pill (including any distribution under a rights agreement) or other similar anti-takeover provision under the Company’s Articles of Incorporation (or similar
charter documents) or the laws of its state of incorporation that is or could become applicable to Enable as a result of Enable and the Company fulfilling their obligations or exercising their rights under the Transaction Documents, including
without limitation as a result of the Company’s issuance of the Securities and Enable’s ownership of the Securities. 
  

 13 

 (x) Disclosure. Except with respect to the material terms and conditions of the
transactions contemplated by the Transaction Documents, the Company confirms that neither it nor any other Person acting on its behalf has provided any of Enable or its agents or counsel with any information that it believes constitutes or might
constitute material, non-public information which is not otherwise disclosed in the Prospectus Supplement. The Company understands and confirms that Enable will rely on the foregoing representation in effecting transactions in securities of the
Company. All disclosure furnished by or on behalf of the Company to Enable regarding the Company, its business and the transactions contemplated hereby, including the Disclosure Schedules to this Agreement, is true and correct and does not contain
any untrue statement of a material fact or omit to state any material fact necessary in order to make the statements made therein, in light of the circumstances under which they were made, not misleading. The Company acknowledges and agrees that
Enable does not make and has not made any representations or warranties with respect to the transactions contemplated hereby other than those specifically set forth in Section 3.2 hereof. 
 (y) No Integrated Offering. Assuming the accuracy of Enable’s representations and warranties set forth in Section 3.2,
neither the Company, nor any of its Affiliates, nor any Person acting on its or their behalf has, directly or indirectly, made any offers or sales of any security or solicited any offers to buy any security, under circumstances that would cause this
offering of the Securities to be integrated with prior offerings by the Company for purposes of any applicable shareholder approval provisions of any Trading Market on which any of the securities of the Company are listed or designated. The issuance
and sale of the Securities hereunder does not contravene the rules and regulations of the Trading Market. 
 (z)
Solvency. The SEC Reports set forth as of the dates thereof all outstanding secured and unsecured Indebtedness of the Company or any Subsidiary, or for which the Company or any Subsidiary has commitments. Neither the Company nor any
Subsidiary is in default with respect to any Indebtedness. 
 (aa) Tax Status. Except for matters that could not,
individually or in the aggregate, have or reasonably be expected to result in a Material Adverse Effect, the Company and each Subsidiary has filed all necessary federal, state and foreign income and franchise tax returns and has paid or accrued all
taxes shown as due thereon, and the Company has no knowledge of a tax deficiency which has been asserted or threatened against the Company or any Subsidiary. 
 (bb) Foreign Corrupt Practices. Neither the Company, nor to the knowledge of the Company, any agent or other person acting on
behalf of the Company, has (i) directly or indirectly, used any funds for unlawful contributions, gifts, entertainment or other unlawful expenses related to foreign or domestic political activity, (ii) made any unlawful payment to foreign
or domestic government officials or employees or to any foreign or domestic political parties or campaigns from corporate funds, (iii) failed to disclose fully 

  

 14 

 
any contribution made by the Company (or made by any person acting on its behalf of which the Company is aware) which is in violation of law, or
(iv) violated in any material respect any provision of the Foreign Corrupt Practices Act of 1977, as amended. 
 (cc)
Accountants. To the knowledge of the Company, Stonefield Josephson, Inc. (i) is a registered public accounting firm as required by the Exchange Act and (ii) shall express its opinion with respect to the financial statements to be
included in the Company’s Annual Report on Form 10-K for the year ending December 31, 2008. 
 (dd)
Acknowledgment Regarding Enable’s Purchase of Securities. The Company acknowledges and agrees that Enable is acting solely in the capacity of an arm’s length purchaser with respect to the Transaction Documents and the transactions
contemplated thereby. The Company further acknowledges that Enable is not acting as a financial advisor or fiduciary of the Company (or in any similar capacity) with respect to the Transaction Documents and the transactions contemplated thereby and
any advice given by Enable or any of its representatives or agents in connection with the Transaction Documents and the transactions contemplated thereby is merely incidental to Enable’s purchase of the Securities. The Company further
represents to Enable that the Company’s decision to enter into this Agreement and the other Transaction Documents has been based solely on the independent evaluation of the transactions contemplated hereby by the Company and its
representatives. 
 (ee) Acknowledgement Regarding Enable’s Trading Activity. Anything in this Agreement or
elsewhere herein to the contrary notwithstanding (except for Sections 3.2(e) and 4.10 hereof), it is understood and acknowledged by the Company (i) that Enable has not been asked to agree, nor has Enable agreed, to desist from purchasing or
selling, long and/or short, securities of the Company, or “derivative” securities based on securities issued by the Company or to hold the Securities for any specified term; (ii) that past or future open market or other transactions
by Enable, including Short Sales, and specifically including, without limitation, Short Sales or “derivative” transactions, before or after the closing of this or future transactions, may negatively impact the market price of the
Company’s publicly-traded securities; (iii) that Enable, and counter-parties in “derivative” transactions to which Enable is a party, directly or indirectly, presently may have a “short” position in the Common Stock,
and (iv) that Enable shall not be deemed to have any affiliation with or control over any arm’s length counter-party in any “derivative” transaction. The Company further understands and acknowledges that (a) Enable may
engage in hedging activities at various times during the period that the Securities are outstanding, and (b) such hedging activities (if any) could reduce the value of the existing stockholders’ equity interests in the Company at and after
the time that the hedging activities are being conducted. The Company acknowledges that such aforementioned hedging activities do not constitute a breach of any of the Transaction Documents. 
 (ff) Regulation M Compliance. The Company has not, and to its knowledge no one acting on its behalf has, (i) taken,
directly or indirectly, any action designed to cause or to result in the stabilization or manipulation of the price of any security of the Company to facilitate the sale or resale of any of the Securities, (ii) sold, bid for, 

  

 15 

 
purchased, or, paid any compensation for soliciting purchases of, any of the Securities, or (iii) paid or agreed to pay to any person any compensation
for soliciting another to purchase any other securities of the Company, other than, in the case of clauses (ii) and (iii), compensation paid to the Company’s placement agent in connection with the placement of the Securities. 

3.2 Representations, Warranties and Covenants of Enable. Enable hereby represents and warrants as of the date hereof and as of the Closing Date
and, if applicable, as of the Option Closing Date to the Company as follows: 
 (a) Organization; Authority. Each of
Enable and each Enable Affiliate is an entity duly organized, validly existing and in good standing under the laws of the jurisdiction of its organization with full right, corporate, LLC or partnership power and authority to enter into and to
consummate the transactions contemplated by the Transaction Documents and otherwise to carry out its obligations hereunder and thereunder. The execution, delivery and performance by each of Enable and each Enable Affiliate of the transactions
contemplated by this Agreement have been duly authorized by all necessary corporate or similar action on the part of each of Enable and each Enable Affiliate. Each Transaction Document to which it is a party has been duly executed by each of Enable
and each Enable Affiliate, and when delivered by Enable/such Enable Affiliate in accordance with the terms hereof, will constitute the valid and legally binding obligation of Enable/such Enable Affiliate, enforceable against it in accordance with
its terms, except (i) as limited by general equitable principles and applicable bankruptcy, insolvency, reorganization, moratorium and other laws of general application affecting enforcement of creditors’ rights generally, (ii) as
limited by laws relating to the availability of specific performance, injunctive relief or other equitable remedies and (iii) insofar as indemnification and contribution provisions may be limited by applicable law. 
 (b) Own Account. Enable is acquiring the Securities as principal for its own account and not with a view to or for distributing or
reselling such Securities or any part thereof in violation of the Securities Act or any applicable state securities law, has no present intention of distributing any of such Securities in violation of the Securities Act or any applicable state
securities law and has no direct or indirect arrangement or understandings with any other Persons to distribute or regarding the distribution of such Securities (this representation and warranty not limiting Enable’s right to sell the
Securities in compliance with applicable federal and state securities laws) in violation of the Securities Act or any applicable state securities law. Enable is acquiring the Securities hereunder in the ordinary course of its business. 

(c) Enable Status. At the time Enable was offered the Securities, it was, and at the date hereof it is, either: (i) an
“accredited investor” as defined in Rule 501(a)(1), (a)(2), (a)(3), (a)(7) or (a)(8) under the Securities Act or (ii) a “qualified institutional buyer” as defined in Rule 144A(a) under the Securities Act. Enable is not
required to be registered as a broker-dealer under Section 15 of the Exchange Act. 
  

 16 

 (d) Experience of Enable. Enable, either alone or together with its
representatives, has such knowledge, sophistication and experience in business and financial matters so as to be capable of evaluating the merits and risks of the prospective investment in the Securities, and has so evaluated the merits and risks of
such investment. Enable is able to bear the economic risk of an investment in the Securities and, at the present time, is able to afford a complete loss of such investment. Enable understands that nothing in the Agreement or any other materials
presented to Enable in connection with the purchase and sale of the Securities constitutes legal, tax or investment advice. Enable acknowledges that it must rely on legal, tax and investment advisors of its own choosing in connection with its
purchase of the Securities. 
 (e) Short Sales and Confidentiality Prior To The Date Hereof. Other than the
transactions contemplated hereunder, Enable has not directly or indirectly, nor has any Person acting on behalf of or pursuant to any understanding with Enable, executed any disposition, including Short Sales, in the securities of the Company
during the period commencing from the time that Enable first received a term sheet (written or oral) from the Company or any other Person setting forth the material terms of the transactions contemplated hereunder until the date hereof
(“Discussion Time”). Enable has maintained the confidentiality of all disclosures made to it in connection with this transaction (including the existence and terms of this transaction). 
 (f) No Government Review. Enable understands that no United States federal or state agency or any other government or governmental
agency has passed upon or made any recommendation or endorsement of the Securities purchased hereunder. 
 (g) No Intent to
Effect a Change of Control. Enable has no present intent to effect a “change of control” of the Company as such term is understood under the rules promulgated pursuant to Section 13(d) of the Exchange Act. 
 (h) Series C Preferred Stock. Enable and the Enable Affiliates own beneficially and of record 2,000 shares of Series C Preferred
Stock, free and clear of all Liens. 
 (i) Enable Claims. Enable and the Enable Affiliates own the Enable Claims free
and clear of all Liens, and have never transferred all or any part of the Enable Claims to anyone, nor given to anyone any right or claim measured by the Enable Claims. 
  

 17 

 ARTICLE IV. 
 OTHER AGREEMENTS OF THE PARTIES 
 4.1 Furnishing of Information 
 (a) Until Enable owns no Securities, the Company covenants to maintain the registration of the Common Stock under Section 12(b) or
12(g) of the Exchange Act and to timely file (or obtain extensions in respect thereof and file within the applicable grace period) all reports required to be filed by the Company after the date hereof pursuant to the Exchange Act, unless the Company
is acquired. As long as Enable owns Securities, if the Company is not required to file reports pursuant to the Exchange Act, it will prepare and furnish to Enable and make publicly available in accordance with Rule 144(c) such information as is
required for Enable to sell the Securities under Rule 144. The Company further covenants that it will take such further action as any holder of Securities may reasonably request, to the extent required from time to time to enable such Person to sell
such Securities without registration under the Securities Act within the requirements of the exemption provided by Rule 144. 
 (b) At any time during the period commencing from the six (6) month
anniversary of the date hereof and ending at such time that all of the Securities may be sold without the requirement for the Company to be in compliance with Rule 144(c)(1) and otherwise without restriction or limitation pursuant to Rule 144, if
the Company shall fail for any reason to satisfy the current public information requirement under Rule 144(c) (a “Public Information Failure”) then, in addition to Enable’s other available remedies, the Company shall pay to Enable, in
cash, as partial liquidated damages and not as a penalty, by reason of any such delay in or reduction of its ability to sell the Securities, an amount in cash equal to two percent (2.0%) of the aggregate Subscription Amount of Enable’s
Securities on the day of a Public Information Failure and on every thirtieth (30th) day (pro rated for periods totaling less than thirty days)
thereafter until the earlier of (a) the date such Public Information Failure is cured and (b) such time that such public information is no longer required for Enable to transfer the Underlying Shares pursuant to Rule 144. The
payments to which Enable shall be entitled pursuant to this Section 4.1(b) are referred to herein as “Public Information Failure Payments.” Public Information Failure Payments shall be paid on the earlier of (i) the
last day of the calendar month during which such Public Information Failure Payments are incurred and (ii) the third (3rd) Business Day
after the event or failure giving rise to the Public Information Failure Payments is cured. In the event the Company fails to make Public Information Failure Payments in a timely manner, such Public Information Failure Payments shall bear
interest at the rate of 1.5% per month (prorated for partial months) until paid in full. Nothing herein shall limit Enable’s right to pursue actual damages for the Public Information Failure, and Enable shall have the right to pursue all
remedies available to it at law or in equity including, without limitation, a decree of specific performance and/or injunctive relief. 
 4.2
Integration. The Company shall not sell, offer for sale or solicit offers to buy or otherwise negotiate in respect of any security (as defined in Section 2 of the Securities Act) that would be integrated with the offer or sale of the
Securities for purposes of the rules and 

  

 18 

 
regulations of any Trading Market such that it would require shareholder approval prior to the closing of such other transaction unless shareholder approval
is obtained before the closing of such subsequent transaction. 
 4.3 Securities Laws Disclosure; Publicity. The Company shall
(a) at or before the time required by MTA rules and regulations, issue a press release disclosing the material terms of the transactions contemplated hereby, and (b) by 8:30 a.m. (New York City time) on the third Trading Day following the
date hereof, file a Current Report on Form 8-K disclosing the material terms of the transactions contemplated hereby and including the Transaction Documents as exhibits thereto. The Company and Enable shall consult with each other in issuing any
other press releases with respect to the transactions contemplated hereby, and, except as may be required by law, neither the Company nor Enable shall issue any such press release or otherwise make any such public statement without the prior consent
of the Company, with respect to any press release of Enable, or without the prior consent of Enable, with respect to any press release of the Company, which consent shall not unreasonably be withheld or delayed, except if such disclosure is required
by law, in which case the disclosing party shall promptly provide the other party with prior notice of such public statement or communication. Notwithstanding the foregoing, the Company shall not publicly disclose the name of Enable, or include the
name of Enable in any filing with the Commission or any regulatory agency or Trading Market, without the prior written consent of Enable, except (i) as required by federal securities law in connection with the filing of final Transaction
Documents (including signature pages thereto) with the Commission and (ii) to the extent such disclosure is required by law or Trading Market regulations, in which case the Company shall provide Enable with prior notice of such disclosure
permitted under this subclause (ii). 
 4.4 Non-Public Information. Except with respect to the material terms and conditions of the
transactions contemplated by the Transaction Documents, the Company covenants and agrees that neither it nor any other Person acting on its behalf will provide Enable or its agents or counsel with any information that the Company believes
constitutes material non-public information, unless prior thereto Enable shall have executed a written agreement regarding the confidentiality and use of such information. The Company understands and confirms that Enable shall be relying on the
foregoing representations in effecting transactions in securities of the Company. 
 4.5 Use of Proceeds. The use of proceeds shall be
as described in the Prospectus Supplement. 
 4.6 Indemnification of Enable. Subject to the provisions of this Section 4.6, the
Company will indemnify and hold Enable and its directors, officers, shareholders, members, partners, employees and agents (and any other Persons with a functionally equivalent role of a Person holding such titles notwithstanding a lack of such title
or any other title), each Person who controls Enable (within the meaning of Section 15 of the Securities Act and Section 20 of the Exchange Act), and the directors, officers, shareholders, agents, members, partners or employees (and any
other Persons with a functionally equivalent role of a Person holding such titles notwithstanding a lack of such title or any other title) of such controlling persons (each, an “Enable Party”) harmless from any and all losses,
liabilities, obligations, claims, contingencies, damages, costs and expenses, including all judgments, amounts paid in settlements, court costs 

  

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and reasonable attorneys’ fees and costs of investigation that Enable Party may suffer or incur as a result of or relating to (a) any breach of any
of the representations, warranties, covenants or agreements made by the Company in this Agreement or in the other Transaction Documents or (b) any action instituted against Enable, or any of them or their respective Affiliates, by any
stockholder of the Company who is not an Affiliate of Enable, with respect to any of the transactions contemplated by the Transaction Documents (unless such action is based upon a breach of Enable’s representations, warranties or covenants
under the Transaction Documents or any agreements or understandings Enable may have with any such stockholder or any violations by Enable of state or federal securities laws or any conduct by Enable which constitutes fraud, gross negligence, willful
misconduct or malfeasance). If any action shall be brought against an Enable Party in respect of which indemnity may be sought pursuant to this Agreement, such Enable Party shall promptly notify the Company in writing, and the Company shall have the
right to assume the defense thereof with counsel of its own choosing reasonably acceptable to such Enable Party. Such Enable Party shall have the right to employ separate counsel in any such action and participate in the defense thereof, but the
fees and expenses of such counsel shall be at the expense of such Enable Party except to the extent that (i) the employment thereof has been specifically authorized by the Company in writing, (ii) the Company has failed after a reasonable
period of time to assume such defense and to employ counsel or (iii) in such action there is, in the reasonable opinion of such separate counsel, a material conflict on any material issue between the position of the Company and the position of
such Enable Party, in which case the Company shall be responsible for the reasonable fees and expenses of no more than one such separate counsel. The Company will not be liable to an Enable Party under this Agreement (i) for any settlement by
such Enable Party effected without the Company’s prior written consent, which shall not be unreasonably withheld or delayed or (ii) to the extent, but only to the extent that a loss, claim, damage or liability is attributable to such
Enable Party’s breach of any of the representations, warranties, covenants or agreements made by such Enable Party in this Agreement or in the other Transaction Documents. 
 4.7 Reservation and Registration of Common Stock. As of the date hereof, the Company has reserved and the Company shall continue to reserve and
keep available at all times, free of preemptive rights, a sufficient number of shares of Common Stock for the purpose of enabling the Company to issue all of the Underlying Shares, and, if the B Convertible Notes are issued, all of the B Underlying
Shares, in full. 
 4.8 Listing of Common Stock. The Company hereby agrees to use commercially reasonable best efforts to maintain the
listing of the Common Stock on a Trading Market, or failing that the OTC Bulletin Board, and as soon as reasonably practicable following the Closing to list all of the Underlying Shares and B Underlying Shares on such Trading Market subject to
issuance. The Company further agrees that if the Company applies to have the Common Stock traded on any other Trading Market, it will include in such application all of the Underlying Shares, and will take such other action as is necessary to cause
all of the Underlying Shares and B Underlying Shares to be listed on such other Trading Market as promptly as possible subject to issuance. The Company will take all action reasonably necessary to continue the listing and trading of its Common Stock
on a Trading Market, or failing that on the OTC Bulletin Board, and will comply in all respects with the Company’s reporting, filing and other obligations under the bylaws or rules of the Trading Market. 
  

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 4.9 Supplemental Indenture. The Company shall, when, if and as needed, enter into a Trust
Indenture with US Bank National Association as Trustee, with respect to the B Convertible Notes. 
 4.10 Short Sales and Confidentiality
After The Date Hereof. Enable covenants that neither it nor any Affiliate acting on its behalf or pursuant to any understanding with it will execute any Short Sales during the period commencing at the Discussion Time and ending at the time that
the transactions contemplated by this Agreement are first publicly announced as described in Section 4.3. Enable covenants that until such time as the transactions contemplated by this Agreement are publicly disclosed by the Company as
described in Section 4.3, Enable will maintain the confidentiality of all disclosures made to it in connection with this transaction (including the existence and terms of this transaction). Notwithstanding the foregoing, Enable makes no
representation, warranty or covenant hereby that it will not engage in Short Sales in the securities of the Company after the time that the transactions contemplated by this Agreement are first publicly announced as described in Section 4.3.

 4.11 Subsequent Equity Sales. 
 (a) From the date hereof until September 30, 2008, the Company shall not issue any equity securities or convertible instruments convertible into equity of the Company, except pursuant to this Agreement or
pursuant to an Exempt Issuance. 
 (b) From the date of the Company’s exercise of the Option until 15 calendar days
thereafter, the Company shall not issue any equity securities or convertible instruments convertible into equity of the Company, except pursuant to this Agreement or pursuant to an Exempt Issuance. 
 4.12 Delivery of Securities After Closing. The Company shall deliver, or cause to be delivered, the respective Securities purchased by Enable to
Enable within 3 Business Days after the Closing Date or, as applicable, within 3 Business Days after the Option Closing Date. 
 4.13
Conversion of Enable Preferred Stock after Closing; Partial Resolution of Enable Claims. The Company, Enable and the Enable Affiliates agree as follows: 
 (a) The Company shall deliver at the Closing to an escrow/paying agent and such escrow/paying agent shall, within one Business Day after
the Closing Date, make a payment to Enable and the Enable Affiliates in the amount of $150,000 as an inducement for Enable and the Enable Affiliates to convert 1,000 shares of Series C Preferred Stock owned by Enable and the Enable Affiliates into
Common Stock pursuant to the provisions of the Company’s articles of incorporation; Enable and the Enable Affiliates shall so convert such 1,000 shares of Series Preferred Stock within one Business Day after receipt of such payment. 

(b) The Company shall deliver at the Closing to an escrow/paying agent and such escrow/paying agent shall, within one Business Day
after the Closing Date, make a payment to Enable and the Enable Affiliates in the amount of $1,225,000 in exchange for the prospective satisfaction of 50% of any final judgment which may ever be rendered on the Enable Claims. 
  

 21 

 (c) Enable and the Enable Affiliates agree that upon the payments described in Sections
4.13(a) and 4.13(b) above, 50% of any final judgment which may ever be rendered on the Enable Claims shall be deemed to have been satisfied thereby, with no further action required by Enable, the Enable Affiliates or the Company. 
 4.14 Conversion of Enable Preferred Stock after Option Closing; Final Resolution of Enable Claims. The Company, Enable and the Enable Affiliates
agree as follows: 
 (a) The Company shall deliver at the Option Closing to an escrow/paying agent and such escrow/paying
agent shall, within one Business Day after the Option Closing Date, make a payment to Enable and the Enable Affiliates in the amount of $150,000 as an inducement for Enable and the Enable Affiliates to convert the remaining 1,000 shares of Series C
Preferred Stock owned by Enable and the Enable Affiliates into Common Stock pursuant to the provisions of the Company’s articles of incorporation; Enable and the Enable Affiliates shall so convert such 1,000 shares of Series Preferred Stock
within one Business Day after receipt of such payment. 
 (b) The Company shall deliver at the Option Closing to an
escrow/paying agent and such escrow/paying agent shall, within one Business Day after the Option Closing Date, make a payment to Enable and the Enable Affiliates in the amount of $1,225,000 to finally and fully resolve the Enable Claims. 

(c) Upon the payments described in Sections 4.13(a), 4.13(b), 4.14(a) and 4.14(b) above, all the Enable Claims are thereby fully
satisfied and resolved and Enable and the Enable Affiliates shall take whatever action is required to have any and all of the Enable Claims dismissed with prejudice. 
 4.15 Maintain Position. Enable and each Enable Affiliate agree for the benefit of the Company not to transfer, or grant any person any interest in, any Series C Preferred Stock or any Enable Claims. The
Company, Enable and each Enable Affiliate agree not to seek any further discovery or file any further motions in Enable Growth Partners, LP, et al. v. Cell Therapeutics, Inc., N.Y. Sup. Ct., Index No. 600206-08. The agreements made in
this Section 4.15 shall expire when and if the Option expires. 
 ARTICLE V. 
 OPTION 
 5.1 Option Put
Exercise. The Company shall have the right (but not the obligation), exercisable only by written notice delivered by the Company by no later than the 15th calendar day after the Option first becomes exercisable, to require Enable to purchase from the Company $9,000,000 principal amount of B Convertible Notes, in exchange for $9,000,000 cash, at the Option Closing to be held on the Option
Closing Date. The Option shall first become exercisable on the 15th calendar day after the Closing or, if earlier, on the date when 100% of the
Convertible Notes have been converted into Common Stock pursuant to their terms. However, the Company shall in no event have a right to so exercise (even during such 15-day period) unless, at the time of such exercise, (a) the Common Stock
closing bid price on the last Trading Day before the notice of exercise is given is at least $1.27, (b) the average daily trading volume 

  

 22 

 
on Nasdaq and the MTA combined, for the period from the Closing Date through the last Trading Day before the notice of exercise is given, inclusive, is at
least 885,827 shares of Common Stock, and (c) the Company has submitted a sBLA for Zevalin. 
 5.2 Option Closing. All provisions of this Agreement pertaining to the Closing shall also apply to the Option Closing, mutatis mutandis, unless the context requires otherwise. For avoidance of doubt: if notice
of exercise of the Option is properly given by no later than the 15th calendar day after the Option first becomes exercisable pursuant to
Section 5.1, it is permissible for the Option Closing Date to be the second Business Day after such notice of exercise even if such second Business Day is beyond the 15-day period. 
 ARTICLE VI. 
 MISCELLANEOUS 
 6.1 Termination. This Agreement may be terminated by Enable by written notice to the Company, if the Closing has not been consummated on or
before September 24, 2008; provided, however, that no such termination will affect the right of any party to sue for any breach by the other party (or parties). 
 6.2 Fees and Expenses. Except as expressly set forth in the Transaction Documents to the contrary, and except that the Company shall reimburse
Enable for up to $20,000 of FWS legal fees, each party shall pay the fees and expenses of its advisers, counsel, accountants and other experts, if any, and all other expenses incurred by such party incident to the negotiation, preparation,
execution, delivery and performance of this Agreement. The Company shall pay all transfer agent fees, stamp taxes and other taxes and duties levied in connection with the delivery of any Securities to Enable. 
 6.3 Entire Agreement. The Transaction Documents, together with the exhibits and schedules thereto, the Prospectus and the Prospectus Supplement,
contain the entire understanding of the parties with respect to the subject matter hereof and supersede all prior agreements and understandings, oral or written, with respect to such matters, which the parties acknowledge have been merged into such
documents, exhibits and schedules. 
 6.4 Notices. Any and all notices or other communications or deliveries required or permitted to
be provided hereunder shall be in writing and shall be deemed given and effective on the earliest of (a) the date of transmission, if such notice or communication is delivered via facsimile at the facsimile number set forth on the signature
pages attached hereto prior to 5:30 p.m. (New York City time) on a Trading Day, (b) the next Trading Day after the date of transmission, if such notice or communication is delivered via facsimile at the facsimile number set forth on the
signature pages attached hereto on a day that is not a Trading Day or later than 5:30 p.m. (New York City time) on any Trading Day, (c) the second Trading Day following the date of mailing, if sent by U.S. nationally recognized overnight
courier service, or (d) upon actual receipt by the party to whom such notice is required to be given. The address for such notices and communications shall be as set forth on the signature pages attached hereto. 
  

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 6.5 Amendments; Waivers. No provision of this Agreement may be waived or amended except in a
written instrument signed, in the case of an amendment, by the Company and the holders of at least 67% of the Convertible Notes or, in the case of a waiver, by the party against whom enforcement of any such waived provision is sought. No waiver of
any default with respect to any provision, condition or requirement of this Agreement shall be deemed to be a continuing waiver in the future or a waiver of any subsequent default or a waiver of any other provision, condition or requirement hereof,
nor shall any delay or omission of any party to exercise any right hereunder in any manner impair the exercise of any such right. 
 6.6
Headings. The headings herein are for convenience only, do not constitute a part of this Agreement and shall not be deemed to limit or affect any of the provisions hereof. 
 6.7 Successors and Assigns. This Agreement shall be binding upon and inure to the benefit of the parties and their successors and permitted
assigns. The Company may not assign this Agreement or any rights or obligations hereunder without the prior written consent of Enable (other than by merger). Enable may assign any or all of its rights under this Agreement to any Person to whom
Enable assigns or transfers any Securities, provided such transferee agrees in writing to be bound, with respect to the transferred Securities, by the provisions of the Transaction Documents that apply to “Enable”. 
 6.8 No Third-Party Beneficiaries. This Agreement is intended for the benefit of the parties hereto and their respective successors and permitted
assigns and is not for the benefit of, nor may any provision hereof be enforced by, any other Person, except as otherwise set forth in Section 4.6 and except as contemplated by Sections 4.13, 4.14 and 4.15. 
 6.9 Governing Law; Arbitration. All questions concerning the construction, validity, enforcement and interpretation of the Transaction Documents
shall be governed by and construed and enforced in accordance with, and any dispute between the parties relating to or arising from the Transaction Documents shall be governed by, the internal laws of the State of New York, without regard to the
principles of conflicts of law thereof. Each party agrees that all legal proceedings concerning the interpretations, enforcement and defense of the transactions contemplated by this Agreement and any other Transaction Documents (whether brought
against a party hereto or its respective affiliates, directors, officers, shareholders, employees or agents), as well as any dispute between the parties relating to the Transaction Documents, shall be resolved by binding arbitration in San
Francisco, California before an arbitrator with experience in commercial disputes relating to securities. The arbitration shall be administered by JAMS pursuant to its Comprehensive Arbitration Rules and Procedures, or, if for any reason JAMS
refuses to administer such arbitration or JAMS is no longer in business, by the American Arbitration Association (“AAA”) in accordance with its rules and procedures. Unless the arbitrator determines that there is exceptional need for
additional discovery, discovery in the arbitration shall be limited as follows: (1) the parties shall exchange non-privileged relevant documents including, without limitation, all documents that the parties intend to use as
evidence in the arbitration; and (2) each party shall be entitled to take one deposition of seven hours duration of either an opposing party or a non-party. If one party fails to respond within 20 days after the other party mails
a written list of proposed arbitrators to that party by either agreeing to one of the proposed arbitrators or suggesting 3 or more alternate arbitrators, the proposing party may select the arbitrator from among its initial list of proposed
arbitrators and JAMS (or AAA if it is administering the arbitration) shall then appoint that arbitrator to preside over the arbitration. If the parties are unable to agree on an arbitrator, the parties shall select an arbitrator pursuant to 

  

 24 

 
the rules of JAMS (or AAA if it is administering the arbitration). Where reasonable, the arbitrator shall schedule the arbitration hearing within four
(4) months after being appointed. The arbitrator must render a decision in writing, explaining the legal and factual basis for decision as to each of the principal controverted issues. The arbitrator’s decision will be final and binding
upon the parties. A judgment upon any award may be entered in any court of competent jurisdiction. This clause shall not preclude the parties from seeking provisional remedies in aid of arbitration, such as injunctive relief, from any court of
competent jurisdiction. Each party shall be responsible for advancing one-half of the costs of arbitration, including all JAMS (or AAA) fees; provided that, in the award, the prevailing party shall be entitled to recover all of its costs and
expenses, including reasonable attorneys’ fees and costs, arbitrator fees, JAMS (or AAA) fees and costs, and any attorneys’ fees and costs incurred in compelling arbitration. The parties are not waiving, and expressly reserve, any rights
they may have under federal securities laws, rules, and regulations, and any such rights shall be determined in the arbitration provided for herein. Each party hereby irrevocably agrees and submits to the jurisdiction of the federal and state courts
located in the City of San Francisco, California, for any suit, action or proceeding enforcing this arbitration provision or entering judgment upon any arbitral award made pursuant to this arbitration provision, and each party hereby irrevocably
waives, and agrees not to assert in any suit, action or proceeding, any claim that it is not personally subject to the jurisdiction of such courts, or that such suit, action or proceeding is an inconvenient venue. Each party hereby irrevocably
waives personal service of process and consents to process being served in any such suit, action or proceeding by mailing a copy thereof via registered or certified mail or overnight delivery (with evidence of delivery) to such party at the address
in effect for notices to it under this Agreement and agrees that such service shall constitute good and sufficient service of process and notice thereof. Nothing contained herein shall be deemed to limit in any way any right to serve process in any
other manner permitted by law. This provision will be interpreted, construed and governed according to the Federal Arbitration Act (9 U.S.C. Sections 1 et seq.). 
 6.10 Survival. The representations and warranties contained herein shall survive the Closing and the delivery of the Convertible Notes for a period of two years. 
 6.11 Execution. This Agreement may be executed in counterparts, all of which when taken together shall be considered one and the same agreement
and shall become effective when counterparts have been signed by each party and delivered to the other party, it being understood that both parties need not sign the same counterpart (and with the date of effectiveness being determined by the time,
in New York, of such counterparts exchange). In the event that any signature is delivered by facsimile transmission or by e-mail delivery of a “.pdf” format data file, such signature shall create a valid and binding obligation of the party
executing (or on whose behalf such signature is executed) with the same force and effect as if such facsimile or “.pdf” signature page were an original thereof. 
 6.12 Severability. If any term, provision, covenant or restriction of this Agreement is held by a court of competent jurisdiction to be invalid, illegal, void or unenforceable, the remainder of the terms,
provisions, covenants and restrictions set forth herein shall remain in full force and effect and shall in no way be affected, impaired or invalidated, and the parties hereto shall use their commercially reasonable efforts to find and employ an
alternative means to achieve the same or substantially the same result as that contemplated by such term, provision, 

  

 25 

 
covenant or restriction. It is hereby stipulated and declared to be the intention of the parties that they would have executed the remaining terms,
provisions, covenants and restrictions without including any of such that may be hereafter declared invalid, illegal, void or unenforceable. 
 6.13 Rescission and Withdrawal Right. Notwithstanding anything to the contrary contained in (and without limiting any similar provisions of) any of the other Transaction Documents, whenever Enable exercises a right, election, demand
or option under a Transaction Document and the Company does not timely perform its related obligations within the periods therein provided, then Enable may rescind or withdraw, in its sole discretion from time to time upon written notice to the
Company, any relevant notice, demand or election in whole or in part without prejudice to its future actions and rights. 
 6.14
Replacement of Securities. If any certificate or instrument evidencing any Securities is mutilated, lost, stolen or destroyed, the Company shall issue or cause to be issued in exchange and substitution for and upon cancellation thereof (in
the case of mutilation), or in lieu of and substitution therefor, a new certificate or instrument, but only upon receipt of evidence reasonably satisfactory to the Company of such loss, theft or destruction. The applicant for a new certificate or
instrument under such circumstances shall also pay any reasonable third-party costs (including customary indemnity) associated with the issuance of such replacement Securities. 
 6.15 Remedies. In addition to being entitled to exercise all rights provided herein or granted by law, including recovery of damages, each of
Enable and the Company will be entitled to specific performance under the Transaction Documents. The parties agree that monetary damages may not be adequate compensation for any loss incurred by reason of any breach of obligations contained in the
Transaction Documents and hereby agrees to waive and not to assert in any action for specific performance of any such obligation the defense that a remedy at law would be adequate. 
 6.16 Counsel. Enable has been represented by its own separate legal counsel in their review and negotiation of the Transaction Documents.

 6.17 Liquidated Damages. The Company’s obligations to pay any partial liquidated damages or other amounts owing under the
Transaction Documents is a continuing obligation of the Company and shall not terminate until all unpaid partial liquidated damages and other amounts have been paid notwithstanding the fact that the instrument or security pursuant to which such
partial liquidated damages or other amounts are due and payable shall have been canceled. 
 6.18 Construction. The parties agree that
each of them and/or their respective counsel has reviewed and had an opportunity to revise the Transaction Documents and, therefore, the normal rule of construction to the effect that any ambiguities are to be resolved against the drafting party
shall not be employed in the interpretation of the Transaction Documents or any amendments hereto. 
  

 26 

 IN WITNESS WHEREOF, the parties hereto have caused this Securities Purchase Agreement to be duly executed
by their respective authorized signatories as of the date first indicated above. 
  

									
	CELL THERAPEUTICS, INC.	 		 	Address for Notice:
				
	By:	 	/s/ James A. Bianco, M.D.	 		 	501 Elliot Avenue West, Suite 400
		 	Name: James A. Bianco, M.D.	 		 	Seattle, Washington 98119
		 	Title: Chief Executive Officer	 		 	Facsimile: (206) 272-4302
		 		 		 	Attention: James A. Bianco, M.D.
	With a copy to (which shall not constitute notice):	 		 	

 Heller Ehrman LLP 
 333 Bush Street 
 San Francisco, CA 94104 
 Facsimile:
(415) 772-6268 
 Attention: Karen Dempsey, Esq. 
 ENABLE
GROWTH PARTNERS LP 
 Signature of Authorized Signatory of Enable Growth Partners LP: /s/ Brendan
O’Neil                                       
            
 Name of Authorized Signatory: Brendan
O’Neil                                       
            
 Title of Authorized Signatory: President and Chief Investment
Officer                
 Email Address of Enable Growth Partners LP:
_______________________________________ 
 Fax Number of Enable Growth Partners LP: _______________________________________ 
 Address for Notice of Enable Growth Partners LP: 
 Address for Delivery of
Securities for Enable Growth Partners LP (if not same as address for notice): 
 Total Subscription Amount: $9,000,000 
 Principal Amount of Convertible Notes: $9,000,000 
 Total Option Subscription
Amount: $9,000,000 
 Principal Amount of B Convertible Notes: $9,000,000 
 EIN Number: _______________________________________ 
  

 27 

 Agreed to as to Sections 4.13, 4.14 and 4.15: 
 ENABLE OPPORTUNITY PARTNERS LP 
 Signature of Authorized Signatory of Enable Opportunity Partners LP: /s/
Brendan
O’Neil                                       
            
 Name of Authorized Signatory: Brendan
O’Neil                                       
            
 Title of Authorized Signatory: President and Chief Investment
Officer                
 Email Address of Enable Opportunity Partners LP:
_______________________________________ 
 Fax Number of Enable Opportunity Partners LP: _______________________________________ 
 Address for Notice of Enable Opportunity Partners LP: 
 PIERCE
DIVERSIFIED MASTER STRATEGY FUND LLC, ENA 
 Signature of Authorized Signatory of Pierce Diversified Master Strategy Fund LLC, Ena: /s/
Brendan O’Neil                                 
 Name of Authorized Signatory: Brendan
O’Neil                                       
            
 Title of Authorized Signatory: President and Chief Investment
Officer                
 Email Address of Pierce Diversified Master Strategy
Fund LLC, Ena: _______________________________________ 
 Fax Number of Pierce Diversified Master Strategy Fund LLC, Ena:
_______________________________________ 
 Address for Notice of Pierce Diversified Master Strategy Fund LLC, Ena: 
  

 28

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