1. Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K.
2. Evotec (U.K.) Limited, 114 Innovation Drive, Milton Park, Abingdon OX14 4RZ, U.K.
3. GlaxoSmithKline Medicines Research Centre, Gunnels Wood Road, Stevenage, SG1 2NY, U.K.