Affiliation: | 1. Department of Biochemistry, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Nijenborgh 4, 9747?AG Groningen (The Netherlands), Fax: (+31)?5036‐34165;2. Laboratories for Organic Chemistry, Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747?AG Groningen (The Netherlands);3. DSM Pharmaceutical Products, P.?O. Box 18, 6160?MD Geleen (The Netherlands);4. Department of Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, 9713?AV Groningen (The Netherlands) |