1. Institute for Pharmaceutical Biology, University of Bonn, Nussallee 6, D-53115 Bonn, Germany, Division of Toxicology and Cancer Risk Factors, DKFZ−German Cancer Research Center, Im Neuenheimer Feld 280, D-69120 Heidelberg, Germany, Department of Inorganic Chemistry, University of Bonn, Gerhard Domagk Strasse 1, D-53121 Bonn, Germany, Institute for Organic Chemistry, RWTH Aachen, Landoltweg 1, D-52074 Aachen, Germany, and Oncotest GmbH, Institute of Experimental Oncology, Am Flughafen 12-14, D-79108...