1. University of Chemistry and Technology in Prague
2. Department of Chemistry of Natural Compounds
3. 16628 Prague 6
4. Czech Republic
5. Institute of Experimental Botany of the Czech Academy of Sciences
6. Laboratory of Growth Regulators
7. Faculty of Science
8. Palacký University, and Institute of Experimental Botany of the Czech Academy of Sciences
9. 78371 Olomouc
10. Institute of Macromolecular Chemistry of the Czech Academy of Sciences
11. 16206 Prague 6
12. Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences
13. Flemingovo náměstí 2
14. Jan Šarek, Betulinines
15. 28167 Stříbrná Skalice
16. Aalto University
17. School of Science
18. Department of Applied Physics
19. FI-00076 Espoo
20. Finland