1. Department of Chemistry and Physics, Nottingham Trent University, Clifton Lane, Nottingham NG11 8NS, U.K., GlaxoSmithKline, Process Technologies, 709 Swedeland Road, King of Prussia, Pennsylvania 19406, and GlaxoSmithKline, Environmental Research Laboratory, New Frontiers Science Park North, Third Avenue, Harlow, Essex CM17 5AW, U.K.