1. Institute of Pharmaceutical and Medicinal Chemistry Heinrich-Heine-Universität Düsseldorf Universitätsstrasse 1 40225 Düsseldorf Germany
2. Institute of Inorganic and Structural Chemistry Heinrich-Heine-Universität Düsseldorf Universitätsstrasse 1 40225 Düsseldorf Germany
3. Pharmaceutical/Medicinal Chemistry, Institute of Pharmacy Leipzig University Brüderstrasse 34 04103 Leipzig Germany