1. Department of Drug Design and OptimizationHelmholtz Institute for Pharmaceutical Research SaarlandSaarland University Campus E8.1 66123 Saarbrücken Germany
2. Department of Microbial Natural ProductsHelmholtz Institute for Pharmaceutical Research SaarlandSaarland University Campus E8.1 66123 Saarbrücken Germany
3. PharmBioTec GmbH 66123 Saarbrücken Germany
4. Department of Chemical BiologyHelmholtz Centre for Infection Research Inhoffenstrasse 7 38124 Braunschweig Germany
5. Institute of Organic ChemistryLeibniz University of Hannover Schneiderberg 1B 30167 Hannover Germany