1. Department of Pharmaceutical and Medicinal Chemistry, Institute of Pharmaceutical Sciences, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 8, 72076 Tübingen, Germany
2. Synovo GmbH, Paul-Ehrlich-Str. 15, 72076 Tübingen, Germany
3. Teva-ratiopharm, Graf-Arco-Str. 3, 89079 Ulm, Germany
4. Department of Pharmaceutical/Medicinal Chemistry II, Institute of Pharmacy, University of Regensburg, Universitätsstraße 31, 93053 Regensburg, Germany