1. School of Chemistry University of Bristol Cantock's Close Bristol BS8 1TS UK
2. Department of Molecular and Cell Biology and Leicester Institute of Structural and Chemical Biology University of Leicester Lancaster Road Leicester LE1 7RH UK
3. Centre for Natural Products Discovery, Pharmacy and Biomolecular Sciences Liverpool John Moores University James Parsons Building, Byrom Street Liverpool L3 3AF UK
4. RIKEN SPring-8 Center 1-1-1 Kouto Sayo Hyogo 679-5148 Japan
5. Present address: MRC Laboratory of Molecular Biology Francis Crick Avenue, Cambridge Biomedical Campus Cambridge CB1 0QH UK
6. Japan Synchrotron Radiation Research Institute 1-1-1 Kouto Sayo Hyogo 679-5198 Japan
7. Graduate School of Life Science University of Hyogo 3-2-1 Kouto, Kamigori-cho Ako-gun Hyogo 678-1297 Japan