EXHIBIT 99.1 REGISTRATION RIGHTS AGREEMENT THIS REGISTRATION RIGHTS AGREEMENT ("Agreement") is entered into as of April __, 1999 between Vion Pharmaceuticals, Inc., a Delaware corporation with offices at 4 Science Park, New Haven, Connecticut 06511...Registration Rights Agreement • June 4th, 1999 • Vion Pharmaceuticals Inc • Biological products, (no disgnostic substances) • Delaware
ARTICLE ICommon Stock Investment Agreement • June 4th, 1999 • Vion Pharmaceuticals Inc • Biological products, (no disgnostic substances) • New York
