1. Institute of Organic Chemistry and Biochemistry AS CR, Flemingovo náměstí 2, 166 10 Prague 6, Czech Republic, Laboratory of Chemistry, Institute of Experimental Botany AS CR, Vídeňská 1083, 142 20 Prague 4-Krč, Czech Republic, Institute of Microbiology, Videňská 1083, CZ-142 20 Prague 4, Czech Republic, and Institute of Chemical Technology Prague, Faculty of Food and Biochemical Technology, Technická 5, Prague 6, Czech Republic