1. Chemistry and Light − CF Plus Chemicals, Karásek 1767/1, 621 00 Brno, Czech Republic
2. Secondary School of Technical Education in Chemistry, Vranovská, Vranovská 65, 614 00 Brno-Husovice, Czech Republic
3. Department of Chemical Education and Humanities, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic
4. Institute of Organic Chemistry and Biochemistry of the CAS, v.v.i., Flemingovo nám. 2, 166 10 Prague 6, Czech Republic