1. Institut für Chemie; Universität Potsdam; Karl-Liebknecht-Str. 24-25 14476 Potsdam Germany
2. Institute of Organic Chemistry and Biochemistry; Czech Academy of Sciences; Flemingovo n. 2 166 10 Prague 6 Czech Republic
3. Faculty of Chemistry, Biological and Chemical Research Center; University of Warsaw; Żwirki i Wigury 101 02-089 Warsaw Poland