1. Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
2. Department of Drug Design and Optimization, Helmholtz Institute for Pharmaceutical Research Saarland (HIPS) − Helmholtz Centre for Infection Research (HZI), Campus Building E8.1, 66123 Saarbrücken, Germany
3. Department of Pharmacy, Medicinal Chemistry, Saarland University, Campus Building E8.1, 66123 Saarbrücken, Germany