1. 1Pharmaceutical Sciences Research Division, King's College, Franklin-Wilkins Building, 150 Stamford St, London SE1 9NH, UK
2. 2Intramural IT Program, NINDS/NIH, 10 Center Drive, MSC 1430, Bethesda, MD 20892-1430, USA
3. 3Department of Chemistry, University of the West Indies, Mona, Kingston 7, JMAAW15, Jamaica
4. 4School of Chemistry, University of Bristol, Bristol BS8 1TS, UK
5. 5School of Applied Sciences, University of Glamorgan, Pontypridd, Mid-Glamorgan, CF37 1DL, UK
6. 6Department of Chemistry, Illinois State University, Normal, IL 61790-4160, USA