1. Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic and Center for Biomolecules and Complex Molecular Systems, Flemingovo nam. 2, 166 10 Prague 6, Czech Republic
2. Laboratoire de Chimie Physique, CNRS UMR 8000, Université Paris-Sud. Bât. 349, Campus d’Orsay, 15 rue Jean Perrin, 91405 Orsay Cedex, France