1. Organisch Chemisches InstitutWestfälische Wilhelms-Universität Münster Corrensstraße 40 48149 Münster Germany
2. Helmholtz Institute for Pharmaceutical Research Saarland (HIPS)Helmholtz Centre for Infection Research (HZI)Department of Drug Design and Optimization University Campus E8.1 66123 Saarbrücken Germany
3. Department of PharmacySaarland University 66123 Saarbrücken Germany