1. Institute for Medical Biochemistry and Molecular Biology, Division of Cellular Signal Transduction, University Hospital Hamburg-Eppendorf, Martinistrasse 52, D-20246 Hamburg, Germany, Laboratoire de Chimie Bioorganique, Faculté de Pharmacie, UMR 7514 CNRS/ULP, 67400-Strasbourg-Illkirch, France, Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan, Department of Pharmaceutical Chemistry, University of California, San Francisco, California, and Department of Pharmacy and...