1. Lehrstuhl für Organische Chemie I, Bioorganische Chemie, Ruhr‐Universität Bochum, 44780 Bochum (Germany), Fax: (+49) 234‐3214355
2. Department of Physics, King's College London, WC2R 2LS, London (United Kingdom)
3. Department of Engineering, King's College London, WC2R 2LS, London (United Kingdom)