1. Department
of Microbial Drugs, Helmholtz Centre for Infection Research, Inhoffenstraße
7, 38124 Braunschweig, Germany
2. German Centre for Infection Research (DZIF), Partner Site Hannover-Braunschweig, Braunschweig, Germany
3. Department
of Inorganic Chemistry, Saarland University, Building C 4.1, 66123 Saarbrücken, Germany