1. Astex Pharmaceuticals, 436 Cambridge Science Park, Milton Road, Cambridge CB4 0QA, U.K.
2. Cancer Research UK Newcastle Drug Discovery Unit, Newcastle University Centre for Cancer, Chemistry, School of Natural and Environmental Sciences, Newcastle University, Bedson Building, Newcastle upon Tyne NE1 7RU, U.K.
3. Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, U.K.
4. Cancer Research UK Newcastle Drug Discovery Unit, Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Paul O’Gorman Building, Newcastle upon Tyne NE2 4HH, U.K.