1. Institute of Organic Chemistry and Biochemistry; Czech Academy of Sciences; Flemingovo nam. 2 16610 Prague 6 Czech Republic
2. Institute of Microbiology; Czech Academy of Sciences; 14220 Prague 4 Czech Republic
3. Department of Genetics and Microbiology; Faculty of Science; Charles University in Prague; Vinicna 5 12843 Prague 2 Czech Republic
4. Department of Organic Chemistry; Faculty of Science; Charles University in Prague; Hlavova 8 12843 Prague 2 Czech Republic