1. Department of Chemistry, The University of Warwick, Coventry, CV4 7AL, UK
2. Early Chemical Development, Pharmaceutical Sciences, IMED Biotech Unit, AstraZeneca, Macclesfield, SK10 2NA, UK
3. Warwick Medical School, The University of Warwick, Coventry, CV4 7AL, UK
4. School of Chemistry, University of Southampton, SO17 1BJ, UK