1. Zentiva k.s., U kabelovny 130, 102 37 Prague 10, Czech Republic
2. Department of Analytical Chemistry, Faculty of Chemical Engineering, Institute of Chemical Technology, Technicka 5, 16628 Prague 6, Czech Republic
3. Department of Chemical Drugs, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences, Palackeho 1/3, 61242 Brno, Czech Republic