1. School of Chemistry, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK, Fax: +44‐113‐343‐6565, http://www.chem.leeds.ac.uk/People/Halcrow.html
2. CNRS, Université de Bordeaux, ICMCB, 87 avenue du Dr. A. Schweitzer, 33608 Pessac, France, Fax: +33‐5‐40002649, http://www.icmcb‐bordeaux.cnrs.fr/groupes/groupe6.html
3. School of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester M13 9PL, UK