1. Department of Pharmacy Faculty of Medicine, University of Niš Niš Serbia
2. Department of Chemistry Faculty of Medicine, University of Niš Niš Serbia
3. 3Laboratory of Structural Organic Analysis, Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences Sofia Bulgaria
4. Department of Organic Synthesis, University of Chemical Technology and Metallurgy Sofia Bulgaria
5. Department of Biochemistry, Faculty of Medicine, University of Niš Niš Serbia