1. Department of Chemistry and Institute of Structural and Molecular Biology, University College London, London WC1E 0AJ, United Kingdom
2. Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, Missouri 63110, United States
3. EaStCHEM School of Chemistry, University of Edinburgh, Edinburgh EH9 9FJ, United Kingdom
4. Pharmaceutical Sciences, University of Geneva, Geneva 1211, Switzerland