1. Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, U.K.
2. Medicinal Chemistry, Research and Early Development, Oncology R&D, AstraZeneca, Cambridge CB10 1XL, U.K.
3. GSK Medicines Research Centre, Gunnels Wood Road, Stevenage SG1 2NY, Herts, U.K.