1. Department of Organic Chemistry; Faculty of Science; Charles University; Hlavova 8 128 43 Praha 2 Czech Republic
2. Faculty of Science; Okayama University; 3-1-1 Tsushima-naka, Kita-ku 700-8530 Okayama Japan
3. Department of Inorganic Chemistry; Faculty of Science; Charles University; Hlavova 8 128 43 Praha 2 Czech Republic
4. NMR Laboratory; Faculty of Science; Charles University; Hlavova 8 128 43 Praha 2 Czech Republic