1. Institute of Organic Chemistry Karlsruhe Institute of Technology (KIT) Fritz-Haber-Weg 6 76131 Karlsruhe Germany
2. Boehringer Ingelheim Pharma GmbH & Co. KG Birkendorfer Straße 65 88397 Biberach an der Riß Germany
3. Department of Chemistry University of Helsinki P.O. Box 55 (A. I. Virtasen aukio 1) 00014 Helsinki Finland
4. Institute of Biological and Chemical Systems–FMS Karlsruhe Institute of Technology (KIT) Herman-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany