1. University of Vienna, Department of Pharmaceutical Sciences, Division of Pharmaceutical Chemistry, Althanstraße 14, A-1090 Vienna, Austria
2. Drug Resistance Research Group, Institute of Enzymology, RCNS, Eötvös Loránd Research Network, H-1117, Budapest, Magyar tudósok krt. 2, Hungary
3. Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary
4. Department of Medicine I, Institute of Cancer Research, Comprehensive Cancer Center, Medical University of Vienna, A-1090 Vienna, Austria