Document:

Fourth Supplemental Indenture dated as of August 16, 2006  9 5/8%

 Exhibit 4.9(c) 
 FOURTH SUPPLEMENTAL INDENTURE 
 dated as of August 16, 2006 
 among 
 LYONDELL CHEMICAL COMPANY, 

as Company 
 the SUBSIDIARY GUARANTORS party
hereto 
 and 
 THE BANK OF NEW
YORK, 
 as Trustee 
  

 9 5/8% Senior Secured Notes, Series A, due 2007 

 THIS FOURTH SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), entered into as of
August 16, 2006, among LYONDELL CHEMICAL COMPANY, a Delaware corporation (the “Company”), LYONDELL-CITGO REFINING LP, a Delaware limited partnership, LYONDELL HOUSTON REFINERY INC., a Delaware corporation, and LYONDELL HOUSTON
REFINERY A INC., a Delaware corporation (each an “Undersigned”), and THE BANK OF NEW YORK, as trustee (the “Trustee”). 
 RECITALS 
 WHEREAS, the Company, the Subsidiary Guarantors party thereto and the Trustee entered into
the Indenture, dated as of May 17, 1999 (the “Indenture”), relating to the Company’s 9 5/8% Senior Secured Notes, Series A, due 2007 (the “Notes”); 
 WHEREAS, as a condition to the Trustee
entering into the Indenture and the purchase of the Notes by the Holders, the Company agreed, subject to certain exceptions, pursuant to Section 4.22 of the Indenture to cause any Restricted Subsidiary that has guaranteed or secured
Indebtedness of the Company or any of its Restricted Subsidiaries to provide Subsidiary Guarantees. 
 AGREEMENT 
 NOW, THEREFORE, in consideration of the premises and mutual covenants herein contained and intending to be legally bound, the parties hereto hereby agree
as follows: 
 Section 1. Capitalized terms used herein and not otherwise defined herein are used as defined in the Indenture.

 Section 2. Each Undersigned, by its execution of this Supplemental Indenture, agrees to be a Subsidiary Guarantor under the Indenture
and to be bound by the terms of the Indenture applicable to Subsidiary Guarantors, including, but not limited to, Article 13 thereof. 
 Section 3. This Supplemental Indenture shall be governed by and construed in accordance with the internal laws of the State of New York. 
 Section 4. This Supplemental Indenture may be signed in various counterparts which together shall constitute one and the same instrument. 
 Section 5. This Supplemental Indenture is an amendment supplemental to the Indenture and said Indenture and this Supplemental Indenture shall
henceforth be read together. 
 [Remainder of this page intentionally left blank] 
  

 2 

 IN WITNESS WHEREOF, the parties have duly executed and delivered this Supplemental Indenture or have
caused this Supplemental Indenture to be duly executed on their respective behalf by their respective officers thereunto duly authorized, as of the day and year first above written. 
  

			
	 LYONDELL CHEMICAL COMPANY, as Company

		
	By:	 	 /s/ Karen A.Twitchell

	Name:	 	Karen A. Twitchell
	Title:	 	Vice President and Treasurer

  

			
	 LYONDELL-CITGO REFINING LP, as
 Subsidiary Guarantor

		
	 By:
	 	 /s/ Bill Thompson

	 Name:
	 	Bill Thompson
	 Title:
	 	Vice President and General Manager

  

			
	 LYONDELL HOUSTON REFINERY INC., as Subsidiary Guarantor

		
	By:	 	 /s/ Karen A. Twitchell

	Name:	 	Karen A. Twitchell
	Title:	 	Vice President and Treasurer

  

			
	 LYONDELL HOUSTON REFINERY A INC., as Subsidiary Guarantor

		
	 By:
	 	 /s/ Karen A. Twitchell

	 Name:
	 	Karen A. Twitchell
	 Title:
	 	Vice President and Treasurer

 Signature Page to Supplemental Indenture 

			
	 THE BANK OF NEW YORK, as Trustee

		
	By:	 	 /s/ Robert A. Massimillo

	Name:	 	Robert A. Massimillo
	Title:	 	Vice President

 Signature Page to Supplemental IndentureFourth Supplemental Indenture dated as of August 16, 2006  10 7/8%

 Exhibit 4.10(b) 
 FOURTH SUPPLEMENTAL INDENTURE 
 dated as of August 16, 2006 
 among 
 LYONDELL CHEMICAL COMPANY, 

as Company 
 the SUBSIDIARY GUARANTORS party
hereto 
 and 
 THE BANK OF NEW
YORK, 
 as Trustee 
  

 10 7/8% Senior Subordinated Notes due 2009 

 THIS FOURTH SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), entered into as of
August 16, 2006, among LYONDELL CHEMICAL COMPANY, a Delaware corporation (the “Company”), LYONDELL-CITGO REFINING LP, a Delaware limited partnership, LYONDELL HOUSTON REFINERY INC., a Delaware corporation, and LYONDELL
HOUSTON REFINERY A INC., a Delaware corporation (each an “Undersigned”), and THE BANK OF NEW YORK, as trustee (the “Trustee”). 
 RECITALS 
 WHEREAS, the Company, the Subsidiary Guarantors party thereto and the Trustee entered into
the Indenture, dated as of May 17, 1999 (the “Indenture”), relating to the Company’s 10 7/8% Senior Subordinated Notes due 2009 (the “Notes”); 
 WHEREAS, as a condition to the Trustee
entering into the Indenture and the purchase of the Notes by the Holders, the Company agreed, subject to certain exceptions, pursuant to Section 4.21 of the Indenture to cause any Restricted Subsidiary that has guaranteed or secured
Indebtedness of the Company or any of its Restricted Subsidiaries to provide Subsidiary Guarantees. 
 AGREEMENT 
 NOW, THEREFORE, in consideration of the premises and mutual covenants herein contained and intending to be legally bound, the parties hereto hereby agree
as follows: 
 Section 1. Capitalized terms used herein and not otherwise defined herein are used as defined in the Indenture.

 Section 2. Each Undersigned, by its execution of this Supplemental Indenture, agrees to be a Subsidiary Guarantor under the Indenture
and to be bound by the terms of the Indenture applicable to Subsidiary Guarantors, including, but not limited to, Article 13 thereof. 
 Section 3. This Supplemental Indenture shall be governed by and construed in accordance with the internal laws of the State of New York. 
 Section 4. This Supplemental Indenture may be signed in various counterparts which together shall constitute one and the same instrument. 
 Section 5. This Supplemental Indenture is an amendment supplemental to the Indenture and said Indenture and this Supplemental Indenture shall
henceforth be read together. 
 [Remainder of this page intentionally left blank] 
  

 2 

 IN WITNESS WHEREOF, the parties have duly executed and delivered this Supplemental Indenture or have
caused this Supplemental Indenture to be duly executed on their respective behalf by their respective officers thereunto duly authorized, as of the day and year first above written. 
  

			
	 LYONDELL CHEMICAL COMPANY, as Company

		
	 By:
	 	 /s/ Karen A. Twitchell

	 Name:
	 	Karen A. Twitchell
	 Title:
	 	Vice President and Treasurer

  

			
	 LYONDELL-CITGO REFINING LP, as
 Subsidiary Guarantor

		
	By:	 	 /s/ Bill Thompson

	Name:	 	Bill Thompson
	Title:	 	Vice President and General Manager

  

			
	 LYONDELL HOUSTON REFINERY INC., as Subsidiary Guarantor

		
	By:	 	 /s/ Karen A. Twitchell

	Name:	 	Karen A. Twitchell
	Title:	 	Vice President and Treasurer

  

			
	 LYONDELL HOUSTON REFINERY A INC., as Subsidiary Guarantor

		
	 By:
	 	 /s/ Karen A. Twitchell

	 Name:
	 	Karen A. Twitchell
	 Title:
	 	Vice President and Treasurer

 Signature Page to Supplemental Indenture 

			
	 THE BANK OF NEW YORK, as Trustee

		
	 By:
	 	 /s/ Robert A. Massimillo

	 Name:
	 	Robert A. Massimillo
	 Title:
	 	Vice President

 Signature Page to Supplemental IndentureThird Supplemental Indenture dated as of August 16, 2006  9 1/2%

 Exhibit 4.12(c) 
 THIRD SUPPLEMENTAL INDENTURE 
 dated as of August 16, 2006 
 among 
 LYONDELL CHEMICAL COMPANY, 

as Company 
 the SUBSIDIARY GUARANTORS party
hereto 
 and 
 THE BANK OF NEW
YORK, 
 as Trustee 
  

 9 1/2% Senior Secured Notes due 2008 

 THIS THIRD SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), entered into as of
August 16, 2006, among LYONDELL CHEMICAL COMPANY, a Delaware corporation (the “Company”), LYONDELL-CITGO REFINING LP, a Delaware limited partnership, LYONDELL HOUSTON REFINERY INC., a Delaware corporation, and LYONDELL HOUSTON
REFINERY A INC., a Delaware corporation (each an “Undersigned”), and THE BANK OF NEW YORK, as trustee (the “Trustee”). 
 RECITALS 
 WHEREAS, the Company, the Subsidiary Guarantors party thereto and the Trustee entered into
the Indenture, dated as of December 4, 2001 (the “Indenture”), relating to the Company’s 9 1/2% Senior Secured Notes due 2008 (the “Notes”); 
 WHEREAS, as a condition to the Trustee entering
into the Indenture and the purchase of the Notes by the Holders, the Company agreed, subject to certain exceptions, pursuant to Section 4.22 of the Indenture to cause any Restricted Subsidiary that has guaranteed or secured Indebtedness of the
Company or any of its Restricted Subsidiaries to provide Subsidiary Guarantees. 
 AGREEMENT 
 NOW, THEREFORE, in consideration of the premises and mutual covenants herein contained and intending to be legally bound, the parties hereto hereby agree
as follows: 
 Section 1. Capitalized terms used herein and not otherwise defined herein are used as defined in the Indenture.

 Section 2. Each Undersigned, by its execution of this Supplemental Indenture, agrees to be a Subsidiary Guarantor under the Indenture
and to be bound by the terms of the Indenture applicable to Subsidiary Guarantors, including, but not limited to, Article 13 thereof. 
 Section 3. This Supplemental Indenture shall be governed by and construed in accordance with the internal laws of the State of New York. 
 Section 4. This Supplemental Indenture may be signed in various counterparts which together shall constitute one and the same instrument. 
 Section 5. This Supplemental Indenture is an amendment supplemental to the Indenture and said Indenture and this Supplemental Indenture shall
henceforth be read together. 
 [Remainder of this page intentionally left blank] 
  

 2 

 IN WITNESS WHEREOF, the parties have duly executed and delivered this Supplemental Indenture or have
caused this Supplemental Indenture to be duly executed on their respective behalf by their respective officers thereunto duly authorized, as of the day and year first above written. 
  

			
	 LYONDELL CHEMICAL COMPANY, as Company

		
	By:	 	 /s/ Karen A. Twitchell

	 Name:
	 	Karen A. Twitchell
	 Title:
	 	Vice President and Treasurer

  

			
	 LYONDELL-CITGO REFINING LP, as
 Subsidiary Guarantor

		
	 By:
	 	 /s/ Bill Thompson

	 Name:
	 	Bill Thompson
	 Title:
	 	Vice President and General Manager

  

			
	 LYONDELL HOUSTON REFINERY INC., as Subsidiary Guarantor

		
	 By:
	 	 /s/ Karen A. Twitchell

	 Name:
	 	Karen A. Twitchell
	 Title:
	 	Vice President and Treasurer

  

			
	 LYONDELL HOUSTON REFINERY A INC., as Subsidiary Guarantor

		
	 By:
	 	 /s/ Karen A. Twitchell

	 Name:
	 	Karen A. Twitchell
	 Title:
	 	Vice President and Treasurer

 Signature Page to Supplemental Indenture 

			
	 THE BANK OF NEW YORK, as Trustee

		
	By:	 	 /s/ Robert A. Massimillo

	Name:	 	Robert A. Massimillo
	Title:	 	Vice President

 Signature Page to Supplemental Indenture

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