[1] Univ Hull, Dept Chem, Cottingham Rd, Kingston Upon Hull HU6 7RX, England
[2] Univ Hull, Dept Biomed Sci, Cottingham Rd, Kingston Upon Hull HU6 7RX, England
[3] Univ East Anglia, Sch Chem, Norwich Res Pk, Norwich NR4 7TJ, England
[4] Royal Infirm Hosp NHS Trust, MRI Ctr, Anlaby Rd, Kingston Upon Hull HU3 2JZ, England
[5] Kings Coll London, Sch Biomed Engn & Imaging Sci, Dept Imaging Chem & Biol, St Thomas Hosp, Fourth Floor Lambeth Wing, London SE1 7EH, England