1. Pharmaceutical Institute, Pharmaceutical Chemistry I; University of Bonn; An der Immenburg 4 53121 Bonn Germany
2. Institute of Pharmaceutical Chemistry; Philipps University of Marburg; Marbacher Weg 6 35032 Marburg Germany
3. Department of Life Science Informatics, B-IT, LIMES Program Unit Chemical Biology and Medicinal Chemistry; University of Bonn; Dahlmannstr. 2 53113 Bonn Germany