1. Faculty of Chemistry and Chemical Technology, University of Ljubljana, Večna pot 113, SI-1000 Ljubljana, Slovenia
2. Institute of Macromolecular Chemistry, v.v.i., Academy of Sciences of the Czech Republic, Heyrovský Sq. 2, 16206 Prague 6, Czechia
3. Division of Theoretical Chemistry, University of Lund, P.O. Box 124, SE-22100 Lund, Sweden