1. Northern Institute for Cancer Research, School of Natural SciencesChemistry, Bedson Building, University of Newcastle upon Tyne, Newcastle, NE1 7RU, United Kingdom, Northern Institute for Cancer Research, Paul O'Gorman Building, Medical School, Framlington Place, University of Newcastle upon Tyne, Newcastle, NE2 4HH, United Kingdom, and De Novo Pharmaceuticals, Compass House, Vision Park, Histon, Cambridge, CB4 9ZR, United Kingdom