1. Institute of Biotechnology of the Czech Academy of Sciences, BIOCEV, Prumyslova 595, 252 50 Vestec, Czech Republic
2. Forensic Laboratory of Biologically Active Substances, University of Chemistry and Technology Prague, Technická 3, 166 28 Prague 6, Czech Republic
3. Department of Chemistry, Washington State University, Pullman, Washington 99163, United States