1. University of Debrecen, Medical and Health Science Center, Department of Medical Chemistry Bem tér 18/B Debrecen H‐4026 Hungary
2. University of Marburg, Faculty of Pharmacy, Institute for Pharmacology and Toxicology Ketzerbach 63 Marburg Germany
3. University of Marburg, Faculty of Pharmacy, Department of Biochemistry Marbacher Weg 6 D‐35032 Marburg Germany