1. Department of Organic Chemistry; University of Debrecen; H-4002 Debrecen Pf.400. Hungary
2. Department of Pharmaceutical Chemistry; University of Debrecen; H-4002 Debrecen Pf.400 Hungary
3. Department of Inorganic and Analytical Chemistry; University of Debrecen; H-4002 Debrecen Pf.400 Hungary