1. Department of Chemistry, University of Warwick, Coventry, Midlands CV4 7AL, U.K.
2. Chemical Development, Pharmaceutical Technology & Development, Operations, AstraZeneca, Macclesfield, Cheshire SK10 2NA, U.K.
3. Warwick Medical School, University of Warwick, Coventry CV4 7AL, U.K.
4. Faculty of Pharmacy and Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, VIC 3052, Australia