1. Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA, UK
2. Department of Organic Chemistry I, Faculty of Pharmacy and Lascaray Research Center, University of the Basque Country, UPV/EHU, Paseo de la Universidad 7, 01006, Vitoria-Gasteiz, Spain
3. Pfizer Worldwide Research and Development, Eastern Point Road, Groton, Connecticut 06340, USA