1. Friedrich-Schiller-Universität (FSU) Institut für Organische Chemie und Makromolekulare Chemie Humboldtstr. 10 07743 Jena Germany
2. New York University Department of Chemistry 100 Washington Square East New York NY 10003 USA
3. Department of Chemistry Ludwig Maximilian University of Munich Butenandtstrasse 5–13 81377 München Germany
4. Department of Pharmacy Ludwig Maximilian University of Munich Butenandtstrasse 5–13 81377 München Germany
5. Department of Chemistry University of Pennsylvania 231 South 34th St. Philadelphia PA 19104-6323 USA