1. Division of Biological Chemistry and Drug Discovery, College of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5EH, U.K.
2. The Walter and Eliza Hall Institute of Medical Research, 1G Royal Pde, Centre for Drug Candidate Optimisation, Monash Institute of Pharmaceutical Sciences, Monash University (Parkville Campus), Parkville VIC-3052, Australia