1. Department of Chemistry, University of Paderborn, D-33098 Paderborn, Germany, Department of Chemistry, University of Dhaka, Dhaka-1000, Bangladesh, Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhaka-1205, Bangladesh, Department of Chemistry, University of Southern California, Los Angeles, California 90089-0482, and Department of Chemical Biology, Helmholtz Centre for Infection Research, Inhoffenstrasse 7, 38124 Braunschweig, Germany