1. Department
of Chemistry, Lower Mountjoy, Durham University, Stockton Road, Durham, DH1 3LE, U.K.
2. Durham Johnston School, Crossgate Moor, Durham DH1 4SU, U.K.
3. Ashland LLC, 1005 Route 202/206, Bridgewater, New Jersey 08807, United States
4. School
of Medicine, Pharmacy and Health, Durham University, University Boulevard, Stockton-on-Tees, TS17 6BH, U.K.