1. University of Vienna Department of Pharmaceutical Chemistry Althanstrasse 14 1090 Vienna Austria
2. Fondazione Ri.MED Via Bandiera 11 90133 Palermo Italy
3. University of Palermo Department STEBICEF Via Archirafi 32 90123 Palermo Italy
4. University of Vienna X-Ray Structure Analysis Center Waehringerstrasse 42 1090 Vienna Austria
5. University of Turin Department of Chemistry Via P. Giuria 7 10125 Turin Italy