1. School of Chemistry, University of Edinburgh, West Mains Road, Edinburgh EH9 3JJ, U.K.
2. Molecular Medicine Centre, Institute of Genetics and Molecular Medicine, University of Edinburgh, Crewe Road, Edinburgh EH4 2XU, U.K.
3. Department of Chemistry, Rm W300, 6174 University Blvd., Vancouver, British Columbia, Canada, V6T 1Z3
4. Rega Institute for Medical Research, Katholieke Universiteit Leuven, Minderbroedersstraat 10, B-3000 Leuven, Belgium, Department of Chemistry
5. University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, U.K.