1. Institute of Pharmaceutical Science, King’s College London, Franklin-Wilkins Building, 150 Stamford Street, Waterloo Campus, London SE1 9NH, U.K.
2. Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K.
3. Randall Division of Cell and Molecular Biophysics, King’s College London, Henriette Raphael Building, Guy's Campus, London SE1 1UL, U.K.