1. School of Chemistry & Molecular Biosciences The University of Queensland, Brisbane Queensland 4072 Australia
2. Department of Chemistry and Department of Molecular Biology and Biochemistry Simon Fraser University Burnaby British Columbia V5A 1S6 Canada
3. Department of Chemistry University of York Heslington York YO10 5DD UK
4. Current address: Department of Bio-organic Synthesis, Leiden Institute of Chemistry Leiden University 2333 CC Leiden The Netherlands
5. Department of Medical Biochemistry and Microbiology The Biomedical Center University of Uppsala 75123 Uppsala Sweden
6. Technion Integrated Cancer Center (TICC) Rappaport Faculty of Medicine Technion – Israel Institute of Technology Haifa Israel