April 28, 2010

Exhibit 10.09

April 28, 2010

Bank of the West

San Francisco Commercial Banking Xxxxxx

000 Xxxxxxxxxx Xx., 0xx Xxxxx

Xxx Xxxxxxxxx, XX 00000

Attention: Lebbeus S. Case, Jr., Vice President & Senior Relationship Manager

RE:    Amyris Biotechnologies, Inc. (the “Company”)

Ladies and Gentlemen:

Reference is made to (1) the Reimbursement and Security Agreement dated as of November 5, 2009, as amended on December 3, 2009 (the “Reimbursement Agreement”), and (2) the Support Account Agreement dated as of November 5, 2009 (the “Support Agreement”), each between the Company and Bank of the West.

This letter confirms that the Reimbursement Agreement and the Support Agreement are terminated as of the date hereof.

Best Regards,

AMYRIS BIOTECHNOLOGIES, INC.

By:		/s/ Xxxxx Xxxxxxxx
		Xxxxx Xxxxxxxx, Chief Financial Officer

AKNOWLEDGED AND AGREED:

BANK OF THE WEST

By:		/s/ Lebbeus S. Case, Jr.,
		Lebbeus S. Case, Jr., Vice President & Senior Relationship Manager