1. Department of Chemistry Chemistry Research Laboratory University of Oxford 12 Mansfield Road Oxford United Kingdom
2. Current address: Department of Translational Imaging Genentech Inc. 1 DNA Way South San Francisco, CA 94080 USA
3. Wales Research and Diagnostic PET Imaging Centre Cardiff University University Hospital of Wales Heath Park Cardiff CF14 4XN United Kingdom
4. School of Chemistry Cardiff University Main Building Park Place Cardiff CF10 3AT United Kingdom