1. Department of Chemistry, Institute of Organic ChemistryUniversity of Hamburg Martin-Luther-King Platz 6 20146 Hamburg Germany
2. German Center for Infection Research (DZIF), partner site Hamburg-Lübeck-Borstel-Riems Germany
3. Institute of Pharmaceutical and Medicinal ChemistryUniversity of Münster Corrensstr. 48 48149 Münster Germany
4. NRW Graduate School of ChemistryUniversity of Münster Germany
5. Institute of PharmacyMartin Luther University of Halle-Wittenberg Wolfgang-Langenbeck Str. 4 06120 Halle/Saale Germany