1. Central European Institute of Technology Masaryk University Brno <postCode 625 00 Czech Republic
2. Bijvoet Centre for Biomolecular Research Utrecht University Utrecht 3584 CH The Netherlands
3. Department of Mathematics and Statistics Faculty of Science Masaryk University Brno 611 37 Czech Republic
4. Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences Prague 166 10 Czech Republic