1. Department of Chemical Engineering, University of Chemistry and Technology Prague, Technická 3, 166 28 Prague 6, Czech Republic
2. Institute of Physiology, Academy of Sciences of the Czech Republic, Videnska 1083, 142 20 Prague 4, Czech Republic
3. Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nám. 542, 160 00 Prague 6, Czech Republic