1. Department of ChemistryUniversity of Alberta 11227 Saskatchewan Drive Edmonton Alberta T6G 2G2 Canada
2. Ferring Research Institute, Inc. 4245 Sorrento Valley Boulevard San Diego CA 92121 USA
3. Biological Chemistry GroupInstitute of Biology LeidenLeiden University Sylviusweg 72 2333 BE Leiden NL
4. School of ChemistryUniversity of Sydney Chemistry Building (F11) Eastern Avenue Sydney NSW 2006 Australia
5. School of Chemistry and Chemical EngineeringQueen's University 39 Stranmillis Road Belfast BT9 5AG UK