Affiliation: | 1. Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo namesti 2, 16610 Prague 6, (Czech Republic), Fax: (+420)?220‐183‐578;2. Institut für Organische Chemie, Technische Universit?t Braunschweig, Hagenring 30, 38106 Braunschweig (Germany) |