[1] Univ Marburg, Inst Pharmazeut Chem, D-35032 Marburg, Germany
[2] Univ Halle Wittenberg, Inst Biotechnol, D-06120 Halle An Der Saale, Germany
[3] Boehringer Ingelheim GmbH & Co KG, Vienna, Austria
[4] Axxima Pharmaceut AG, Munich, Germany
[5] Bayer AG, Elberfeld, Germany