1. Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nám. 2, 16610 Praha 6, Czech Republic
2. First Faculty of Medicine, Charles University, Kateřinská 32, 12108 Praha 2, Czech Republic
3. Department of Organic Chemistry, Faculty of Science, Charles University, Albertov 6, 12800 Praha 2, Czech Republic
4. Department of Biochemistry, Faculty of Science, Charles University, Albertov 6, 12800 Praha 2, Czech Republic
5. Tucson Research Center, Icagen Inc., 2090 E. Innovation Park Drive, Oro Valley, Arizona 85755, United States