1. Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K.
2. Materials and Chemical Characterisation Facility (MC2), University of Bath, Claverton Down, Bath BA2 7AY, U.K.
3. Oncology R&D, Research & Early Development, AstraZeneca, Darwin Building, 310, Cambridge Science Park, Milton Road, Cambridge CB4 0WG, U.K.