1. Biological Chemistry Group, Institute of Biology, Leiden University, Sylviusweg 72, 2333 BE Leiden, The Netherlands
2. School of Chemistry and Chemical Engineering, Queen's University Belfast, David Keir Building, Stranmillis Road, BT9 5AG, Belfast, UK
3. Molecular Physiology Group, Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
4. Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, China