1. Department of Pharmacy Faculty of Medicine University of Nis Blvd. Dr. Zorana Djindjica 81 18000 Nis Serbia
2. Institute of Pharmaceutical and Medicinal Chemistry Heinrich Heine University Düsseldorf Universitätsstr. 1 40225 Duesseldorf Germany
3. Department of Pharmaceutical Chemistry Faculty of Pharmacy University of Ljubljana Askerceva 7 1000 Ljubljana Slovenia
4. Institute of Pharmaceutical Chemistry Goethe-University of Frankfurt Max-von-Laue Str. 9 60438 Frankfurt/Main Germany
5. Department of Chemistry Faculty of Medicine University of Nis Blvd. Dr. Zorana Djindjica 81 18000 Nis Serbia