1. Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Gilead & IOCB Research Center, Flemingovo nám. 2, Prague-6 16610, Czech Republic
2. Institute
of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor
Strasse 2, Berlin 12489, Germany
3. Department
of Organic Chemistry, Faculty of Science, Charles University in Prague, Hlavova 8, Prague-2 12843, Czech Republic