1. GlaxoSmithKline, 709 Swedeland Road, P.O. Box 1539, King of Prussia, Pennsylvania 19406-0939
2. Chemistry Department, UMIST, P.O. Box 88, Sackville Street, Manchester M60 1QD, UK
3. GlaxoSmithKline, New Frontiers Science Park, Harlow, Essex, CM19 5AW, UK
4. MIMAS, Manchester Computing, University of Manchester, Oxford Road, Manchester M13 9PL, UK