1. Helmholtz Institute for Pharmaceutical Research Saarland; Department of Drug Design and Optimization; Campus E 8.1 66123 Saarbrücken Germany
2. PharmBioTec GmbH; Science Park 1 66123 Saarbrücken Germany
3. Saarland University; Department of Pharmacy, Pharmaceutical and Medicinal Chemistry; Campus C 2.3 66123 Saarbrücken Germany