1. Institute of Experimental Botany of the Czech Academy of Sciences, Isotope Laboratory, Vídeňská 1083, CZ-14220 Prague, Czech Republic
2. Institute of Macromolecular Chemistry of the Czech Academy of Sciences, Heyrovský sq. 2, CZ-16206 Prague 6, Czech Republic
3. Palacký University, Faculty of Science, Department of Experimental Biology, Šlechtitelů 27, CZ-78371 Olomouc, Czech Republic
4. Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, CZ-16610 Prague, Czech Republic
5. University of Chemistry and Technology in Prague, Department of Chemistry of Natural Compounds, Technická 5, CZ-16628 Prague, Czech Republic