1. Department of Chemical Biology 2, Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 7, 9747 AG Groningen, The Netherlands
2. Helmholtz Institute for Pharmaceutical Research Saarland (HIPS)−Helmholtz Centre for Infection Research (HZI), Department of Drug Design and Optimization, Campus Building E8.1, 66123 Saarbrücken, Germany
3. Department of Pharmacy, Saarland University, 66123 Saarbrücken, Germany