Platform Technology and Science, GSK Medicines Research Centre, Stevenage, Hertfordshire SG1 2NY, UK.|Platform Technology and Science, GSK Medicines Research Centre, Stevenage, Hertfordshire SG1 2NY, UK.|Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow G1 1XL, UK.|Platform Technology and Science, GSK Medicines Research Centre, Stevenage, Hertfordshire SG1 2NY, UK.