1. Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Prague, Czech Republic
2. First Faculty of Medicine, Charles University, Prague, Czech Republic
3. Department of Biochemistry, Faculty of Science, Charles University, Prague, Czech Republic
4. Department of Natural Sciences, University of Applied Sciences Bonn-Rhein-Sieg, Rheinbach, Germany
5. Pharmaceutical Institute, Pharmaceutical & Medicinal Chemistry, University of Bonn, Germany