1. Chemical BiologyStratingh Institute for ChemistryUniversity 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 (DDOP) Campus Building E8.1 66123 Saarbrücken Germany
3. Department of PharmacySaarland University, Saarbrücken Campus Building E8.1 66123 Saarbrücken Germany
4. Drug Design Group AG KlebeInstitute of Pharmaceutical Chemistry Marbacher Weg 6 35032 Marburg Germany