1. School of Chemical Sciences University of Auckland Private Bag 92019, Auckland 1142 New Zealand
2. Maurice Wilkins Centre for Biodiscovery University of Auckland Private Bag 92019, Auckland 1142 New Zealand
3. Department of Chemistry The Scripps Research Institute La Jolla, California 92037 USA
4. Auckland Cancer Society Research Centre University of Auckland Private Bag 92019, Auckland 1142 New Zealand
5. School of Biological Sciences University of Auckland Private Bag 92019, Auckland 1142 New Zealand
6. Faculty of Chemistry and Biochemistry Ruhr University Bochum Bochum 44801 Germany