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|                                                   | Page              |
|--------------------------------------------------------|-------------------|
|                                                   |              |
|                                                   |              |
| ARTICLE      I Definitions                             | 1                 |
|                                                   |              |
|                                                   | Section      1.01 | Certain      Defined Terms. | 1 |
|                                                   |              |   |   |
|                                                   | Section      1.02 | Other      Terms. | 5 |
|                                                   |              |   |   |
|                                                   | Section      1.03 | Computation      of Time Periods. | 6 |
|                                                   |              |   |   |
| ARTICLE      II SALE AND PURCHASE OF RECEIVABLE ASSETS | 6                 |
|                                                   |              |
|                                                   | Section      2.01 | Sale      and Purchase of Seller Receivable Assets | 6 |
|                                                   |              |   |   |
|                                                   | Section      2.02 | Payment      for Purchases. | 7 |
|                                                   |              |   |   |
|                                                   | Section      2.03 | General      Settlement Procedures | 9 |
|                                                   |              |   |   |
|                                                   | Section      2.04 | Payments      and Computations, Etc. | 10 |
|                                                   |              |   |   |
|                                                   | Section      2.05 | Buyer's      Servicer Fee | 10 |
|                                                   |              |   |   |
| ARTICLE      III REPRESENTATIONS AND WARRANTIES        | 11                |
|                                                   |              |   |   |
|                                                   | Section      3.01 | Representations      and Warranties of Each Seller | 11 |
|                                                   |              |   |   |
| ARTICLE      IV GENERAL COVENANTS OF EACH SELLER       | 16                |
|                                                   |              |   |   |
|                                                   | Section      4.01 | Affirmative      Covenants of Each Seller | 16 |
|                                                   |              |   |   |
|                                                   | Section      4.02 | Reporting      Requirements of Each Seller | 19 |
|                                                   |              |   |   |
|                                                   | Section      4.03 | Negative      Covenants of Each Seller | 23 |
|                                                   |              |   |   |
| ARTICLE V ADMINISTRATION      AND COLLECTION | 24                |
|                                                   |              |   |   |
|                                                   | Section      5.01 | Designation      of Buyer's Servicer | 24 |
|                                                   |              |   |   |
|                                                   | Section      5.02 | Rights      of the Buyer and the Agent | 24 |
|                                                   |              |   |   |
|                                                   | Section      5.03 | Responsibilities      of the Sellers | 26 |
|                                                   |              |   |   |
|                                                   | Section      5.04 | Further      Actions Evidencing Purchases | 26 |
|                                                   |              |   |   |
| ARTICLE      VI INDEMNIFICATION                        | 27                |
|                                                   |              |   |   |
|                                                   | Section      6.01 | Indemnities      by the Sellers | 27 |
|                                                   |              |   |   |
| ARTICLE      VII ADDITION AND TERMINATION OF SELLERS   | 30                |
|                                                   |              |   |   |

|   | Section      7.01 | Addition of      Sellers                             | 30     |
|--------|-------------------|------------------------------------------------------|--------|
|   |              |                                                 |   |
|   | Section      7.02 | Conditions      Precedentto the Addition of a Seller | 30     |
|   |              |                                                 |   |
|   | Section      7.03 | Termination      of a Seller                         | 32     |

|                            |              |                               |   |
|---------------------------------|-------------------|------------------------------------|--------|
| ARTICLE      VIII MISCELLANEOUS | 33                |
|                            |              |
|                            | Section      8.01 | Amendments,      Etc.              | 33     |
|                            |              |                               |   |
|                            | Section      8.02 | Notices,      Etc.                 | 33     |
|                            |              |                               |   |
|                            | Section      8.03 | Binding      Effect; Assignability | 34     |
|                            |              |                               |   |
|                            | Section      8.04 | Costs,      Expenses and Taxes     | 34     |
|                            |              |                               |

|   | Section      8.05 | Non-Business      Days | 35 |
|--------|-------------------|------------------------|----|

|   |   |   |
|--------|--------|--------|

|   | Section      8.06 | Confidentiality | 35 |
|--------|-------------------|-----------------|----|

|   |   |   |
|--------|--------|--------|

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|                 |                                                                                                                                                                                      |                            | Page   |
|----------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------|--------|
|                 |                                                                                                                                                                                      |                            |   |
|                 |                                                                                                                                                                                      |                            |   |
|                 | Section      8.07                                                                                                                                                                         | Governing      Law              | 36     |
|                 |                                                                                                                                                                                      |                            |   |
|                 | Section      8.08                                                                                                                                                                         | Consent      to Jurisdiction    | 36     |
|                 |                                                                                                                                                                                      |                            |   |
|                 | Section      8.09                                                                                                                                                                         | Execution      in Counterparts  | 37     |
|                 |                                                                                                                                                                                      |                            |   |
|                 | Section      8.10                                                                                                                                                                         | Entire      Agreement           | 37     |
|                 |                                                                                                                                                                                      |                            |   |
|                 | Section      8.11                                                                                                                                                                         | Severability      of Provisions | 37     |
|                 |                                                                                                                                                                                      |                            |   |
|                 | Section      8.12                                                                                                                                                                         | Waiver      of Jury Trial       | 37     |
|                 |                                                                                                                                                                                      |                            |   |
|                 | Section      8.13                                                                                                                                                                         | No      Proceedings             | 38     |
|                 |                                                                                                                                                                                      |                            |   |
| EXHIBITS             |                                                                                                                                                                                      |
|                 |                                                                                                                                                                                      |
| EXHIBIT      A  | Form      of subordinated Note                                                                                                                                                            |                            |
|                 |                                                                                                                                                                                      |                            |   |
| EXHIBIT      B  | Form      of Additional Seller Supplement                                                                                                                                                 |                            |
|                 |                                                                                                                                                                                      |                            |   |
| SCHEDULES            |                                                                                                                                                                                      |
|                 |                                                                                                                                                                                      |
| SCHEDULE      I      | Lock-Box      Banks and Lock-Box Accounts                                                                                                                                                 |                            |
|                 |                                                                                                                                                                                      |                            |   |
| SCHEDULE      II     | Credit      and Collection Policy                                                                                                                                                         |                            |
|                 |                                                                                                                                                                                      |                            |   |
| SCHEDULE      III    | Jurisdiction      of Incorporation, Organizational Identification Number, and Location of      Principal Place of Business, Chief Executive Office and Office Where      Records are Kept |                            |
|                 |                                                                                                                                                                                      |                            |   |
| SCHEDULE      IV     | Financing      Statements                                                                                                                                                                 |                            |
|                 |                                                                                                                                                                                      |                            |   |

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|   | LYONDELL      CHEMICAL COMPANY,    as      a Seller and as Buyer's Servicer |
|--------|-------------------------------------------------------------------------------------------------|

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|   | EQUISTAR      CHEMICALS, LP,    as      a Seller |
|--------|----------------------------------------------------------------------|

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|   | HOUSTON      REFINING LP,    as      a Seller |
|--------|-------------------------------------------------------------------|

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|   | LYONDELLBASELL      RECEIVABLES I, LLC,    as      Buyer |
|--------|------------------------------------------------------------------------------|

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|   | CITIBANK,      N.A., |
|--------|----------------------|

|   |   as      Agent |
|--------|---------------------------|

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|   | By: |
|--------|-----|

|   | Name: |
|--------|-------|

|   | Title: |
|--------|--------|

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| Date   |   | Amount      ofSubordinatedLoan |   | Amount      ofPrincipalPaid |   | UnpaidPrincipalBalance |   | Notation      madeby |
|--------|--------|--------------------------------|--------|-----------------------------|--------|------------------------|--------|----------------------|
|   |   |                           |   |                        |   |                   |   |                 |
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