1. Institute for Drug Discovery, Medical Faculty Leipzig University Brüderstraße 34 04103 Leipzig Germany
2. Institute of Pharmaceutical and Medicinal Chemistry Heinrich-Heine-Universität Düsseldorf 40225 Düsseldorf Germany
3. Center for Biopharmaceuticals Department of Drug Design and Pharmacology University of Copenhagen Universitetsparken 2 2100 Copenhagen Denmark
4. Department of Pediatric Oncology Hematology and Clinical Immunology Medical Faculty Heinrich Heine University Düsseldorf Moorenstr. 5 40225 Düsseldorf Germany
5. Center for Structural Biology Department of Chemistry Vanderbilt University Nashville TN 37221 USA
6. Pharmaceutical and Cell Biological Chemistry Pharmaceutical Institute University of Bonn An der Immenburg 4 53121 Bonn Germany