1. Institute for Organic Chemistry; Leibniz University Hannover; Schneiderberg 1B 30167 Hannover Germany
2. Centre of Biomolecular Drug Research (BMWZ); Schneiderberg 38 30167 Hannover Germany
3. Germany and Helmholtz Centre for Infection Research GmbH (HZI); Inhoffenstraße 7 38124 Braunschweig Germany
4. Helmholtz-Institute for Pharmaceutical Research Saarland (HIPS); Helmholtz Centre for Infection Research (HZI) Saarland University Campus, Building E8.1; 66123 Saarbrücken Germany
5. Deutsches Krebsforschungszentrum; Im Neuenheimer Feld 580 D-69120 Heidelberg Germany