1. Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo nam. 2 16610 Prague 6 Czech Republic
2. Current address: Istituto Italiano di Tecnologia Molecular Modeling and Drug Discovery, Via Morego 30 161 63 Genoa Italy
3. Leipzig University Faculty of Chemistry and Mineralogy Institute of Inorganic Chemistry Johannisallee 29 04103 Leipzig Germany
4. Institute of Inorganic Chemistry of the Czech Academy of Sciences 25068 Husinec-Řež Czech Republic
5. Regional Centre of Advanced Technologies and Materials Department of Physical Chemistry Palacky University 77146 Olomouc Czech Republic