1. Institut
für Chemie, Technische Universität Berlin, Strasse des 17.
Juni 124, 10623 Berlin, Germany
2. Department
of Microbial Drugs, Braunschweig, Helmholtz Centre for Infection Research GmbH, Inhoffenstraße 7, 38124 Braunschweig, Germany
3. German Centre for Infection Research, partner site Hannover-Braunschweig, Inhoffenstraße 7, 38124 Braunschweig, Germany
4. Department
of Chemistry, Egerton University, P.O. Box 536, Egerton, Kenya