1. Cancer Research Horizons Therapeutic Innovation Newcastle Drug Discovery Group, Chemistry, School of Natural and Environmental Sciences, Newcastle University, Bedson Building, NE1 7RU, UK
2. Chemistry, School of Natural and Environmental Sciences, Newcastle University, Bedson Building, NE1 7RU, UK
3. Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, UK
4. Cancer Research Horizons Therapeutic Innovation Newcastle Drug Discovery Group, Translational and Clinical Research Institute, Newcastle University, Paul O'Gorman Building, NE2 4HH, UK
5. Genentech Inc., 1 DNA Way, South San Francisco, California, 94080, USA