1. Institute
of Pharmacy, Department
of Pharmaceutical and Medicinal Chemistry, Eberhard-Karls-University,
Auf der Morgenstelle 8, 72076 Tübingen, Germany
2. Department of Organic Chemistry,
Johannes Gutenberg-University Mainz, Duesbergweg 10-14, D-55099 Mainz,
Germany
3. Faculty of Chemistry—Chemical
Biology, Technische Universität Dortmund, Otto-Hahn-Strasse
6, D-44227 Dortmund, Germany