1. Faculty of Sciences, Charles University, Hlavova 8, 128 43 Prague 2, Czech Republic
2. Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland
3. EaStChem School of Chemistry, University of St. Andrews, North Haugh, Fife, St. Andrews KY16 9ST, U.K.