1. Department of Chemistry University of Basel St. Johann's-Ring 19 4056 Basel Switzerland
2. Prievidza Chemical Society M. Hodžu 10/16 971 01 Prievidza Slovakia
3. Department of Organic Chemistry University of Granada Avda Fuentenueva, s/n 18 071 Granada Spain
4. Department of Chemistry Biochemistry and Pharamaceutical Sciences University of Bern Freiestrasse 3 3012 Bern Switzerland