1. Department of Chemical Biology Max-Planck-Institute of Molecular Physiology Otto-Hahn-Strasse 11 44227 Dortmund Germany
2. current address: Technical University of Denmark Department of Chemistry Kemitorvet 207 2800 Kgs. Lyngby Denmark
3. Faculty of Chemistry and Chemical Biology TU Dortmund Otto-Hahn-Strasse 6 44227 Dortmund Germany
4. current address: School of Physical and Chemical Sciences University of Canterbury Christchurch New Zealand
5. Institut Curie CNRS UMR 3666 INSERM U1143 PSL University Paris Chemical Cell Biology Group 26 Rue d'Ulm 75248 Paris Cedex 05 France
6. Institut für Chemie der Humboldt-Universität zu Berlin Brook-Taylor-Str. 2 (R 1'102) 12489 Berlin Germany
7. Department of Chemistry Umeå Universitet KB.A4, Linnaeus väg 10 (rum: A4.35.07) 90187 Umeå Sweden
8. Compound Management and Screening Center, Dortmund Otto-Hahn-Str. 11 44227 Dortmund Germany