1. Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Center for Infection Research (HZI), Campus Building E8.1, 66123 Saarbrücken, Germany
2. Department of Pharmacy, Saarland University, Campus Building C2. 3, 66123 Saarbrücken, Germany
3. Department of Chemistry of Natural and Microbial Products, Institute of Pharmaceutical and Drug Industries Research, National Research Centre, El-Buhouth St., Dokki, 12622 Cairo, Egypt
4. Department of Biosciences and Medical Biology, University of Salzburg, Hellbrunner Str. 34, 5020 Salzburg, Austria