1. Thomas Young Centre and Department of Chemical Engineering, University College London, London WC1E 7JE, U.K.
2. Department of Chemistry, University College London, London WC1H 0AJ, U.K.
3. Small Molecule Design & Development, Eli Lilly and Company, Indianapolis, Indiana 46285, United States
4. Holly Chemistry, Hangarvägen 13, S-69135 Karlskoga, Sweden