1. Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo Namesti 542, Prague 166 10, Czech Republic
2. Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030/8, Prague 128 00, Czech Republic
3. Department of Organic Chemistry, Faculty of Chemical Technology, University of Chemistry and Technology, Technicka 5, Prague 166 28, Czech Republic
4. Department of Organic Chemistry, Faculty of Science, Charles University, Hlavova 2030/8, Prague 128 00, Czech Republic
5. First Faculty of Medicine, Charles University, Katerinska 1660/32, Prague 121 08, Czech Republic
6. Department of Cell Biology, Faculty of Science, Charles University, Vinicna 1594/7, Prague 128 43, Czech Republic