1. Department of Pharmacology, School of Medical Sciences, Faculty of Medicine; UNSW Australia; Sydney 2052 NSW Australia
2. NMR Facility, Mark Wainwright Analytical Centre; UNSW Australia; Sydney 2052 NSW Australia
3. School of Chemistry, Faculty of Science; UNSW Australia; Sydney 2052 NSW Australia
4. Auckland Cancer Society Research Centre, School of Medical Sciences, Faculty of Health and Medical Sciences; University of Auckland; New Zealand