1. GlaxoSmithKline Medicines Research CentreGunnels Wood Road Stevenage, Hertfordshire SG1 2NY UK
2. Department of Pure and Applied Chemistry WestCHEMUniversity of Strathclyde 295 Cathedral Street Glasgow, Scotland G1 1XL UK
3. Institute of ChemistryUniversity of Graz Harrachgasse 21/3 8010 Graz Austria
4. Department of ChemistryUniversity of York Heslington, York YO10 5DD UK