1. Department of Microbial Natural Products, Helmholtz-Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Centre for Infection Research (HZI) and Department of Pharmacy, Saarland University, Campus E8 1, 66123 Saarbrücken, Germany
2. German Centre for Infection Research (DZIF), Partner Site Hannover−Braunschweig, Inhoffenstraße 7, 38124 Braunschweig, Germany