1. Department of Imaging Chemistry and Biology, School of Biomedical Engineering and Imaging Sciences, King’s College London, London SE1 7EH, U.K.
2. Department of Biomedical Sciences, University of Hull, Cottingham Road, Hull HU6 7RX, U.K.
3. Positron Emission Tomography Research Center, University of Hull, Cottingham Road, Hull HU6 7RX, U.K.
4. Chemistry, University of Hull, Cottingham Road, Hull HU6 7RX, U.K.
5. Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 2030, Prague 2, Czech Republic
6. E.A. Milne Centre for Astrophysics, Department of Physics and Mathematics, University of Hull, Cottingham Road, Hull HU6 7RX, U.K.