1. School of Chemistry, University of East Anglia, Norwich Research Park, Norwich,
Norfolk NR4 7TJ, U. K.
2. School of Physical & Geographical Sciences, Keele University, Staffordshire ST5 5BG, U. K.
3. Charnwood Molecular Ltd., The Heritage Building, Beaumont Court, Prince
William Road, Loughborough, Leicestershire LE11 5GA, U. K.
4. Molecular Structure Laboratory,
School of Chemistry, University of St. Andrews, Purdie Building St. Andrews, Fife KY16 9ST, U. K.