Infinity Pharmaceuticals (INFIQ) 10-K 2003 FY Annual report

QuickLinks -- Click here to rapidly navigate through this document

Exhibit 23.1

CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

        We consent to the incorporation by reference in the Registration Statement (Form S-8) pertaining to the 2000 Stock Incentive Plan and Employee Stock Purchase Plan of Discovery Partners International, Inc., of our report dated January 23, 2004, with respect to the consolidated financial statements of Discovery Partners International, Inc. included in the Annual Report (Form 10-K) for the year ended December 31, 2003.

/s/  ERNST & YOUNG LLP      

San Diego, California
March 9, 2004

QuickLinks

CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS