1. Lead Discovery Center GmbH, 44227 Dortmund, Germany
2. Laboratory of Chemical Biology & Institute of Complex Molecular Systems, Department of Biomedical Engineering, Technische Universiteit Eindhoven, Den Dolech 2, 5612 AZ Eindhoven, The Netherlands
3. Department of Chemistry, University of Duisburg-Essen, Universitätsstrasse 7, 45117 Essen, Germany