1. Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 12116, Prague 2, Czech Republic
2. Department of Chemistry, Centre for Theoretical and Computational Chemistry, University of Tromsø, N-9037 Tromsø, Norway
3. Institute of Organic Chemistry and Biochemistry, Academy of Sciences, Flemingovo nám. 2, 166 10 Prague, Czech Republic