Affiliation: | 1. Fachbereich Chemie, Philipps‐Universit?t Marburg, Hans‐Meerwein‐Strasse, 35043 Marburg (Germany), Fax: (+49)?6421‐282‐1535;2. Department of Chemistry, University of Pennsylvania, 231 S. 34th Street, Philadelphia, PA 19104 (USA);3. Centre for Structural Genomics, Oxford University, Botnar Research Centre, Oxford, OX3 7 LD (UK) |