<PAGE>
EXHIBIT 23.1
CONSENT OF INDEPENDENT AUDITORS
We consent to the incorporation by reference in the Registration
Statement (Form S-8 No. 333- ) pertaining to the Vion Pharmaceuticals, Inc.
Employee Stock Purchase Plan of our report dated February 18, 2000 (except for
Note 11, as to which the date is March 27, 2000) with respect to the financial
statements of Vion Pharmaceuticals, Inc. included in its Annual Report (Form
10-KSB) for the year ended December 31, 1999, filed with the Securities and
Exchange Commission.
/s/ Ernst & Young LLP
Stamford, Connecticut
January 9, 2001
