1. School of Pharmacy; University of East Anglia, Norwich Research Park; Norwich NR4 7TJ UK
2. Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, CO2-Glyco, UMR 5246, CNRS; Université Claude Bernard Lyon 1; 43 Boulevard du 11 Novembre 1918 69622 Villeurbanne France
3. School of Chemistry; University of Dublin, Trinity College; Dublin 2 Ireland
4. School of Chemistry; University of East Anglia, Norwich Research Park; Norwich NR4 7TJ UK