1. Department of Organic Chemistry, Faculty of Natural Sciences; Comenius University; Mlynská dolina 842 15 Bratislava Slovakia
2. Institute of Experimental Pharmacology and Toxicology; Slovak Academy of Sciences; Dúbravská cesta 9 841 04 Bratislava Slovakia
3. Ecole européenne de Chimie, Polymères et Matériaux (ECPM), Laboratoire de stéréochimie (UMR CNRS 7509); Université de Strasbourg; 25, rue Becquerel F-67087 Strasbourg France