1. Department of Chemistry, Durham University, South Road, Durham, DH1 3LE, U.K.
2. School of Medicine, Pharmacy and Health, Durham University, University Boulevard, Stockton-on-Tees, TS17 6BH, U.K.
3. School of Pharmacy, Queen’s University Belfast, 97 Lisburn Road, Belfast, BT9 7BL, U.K.