1. Department of Chemistry, The University of Auckland, Private Bag 92019, Auckland, New Zealand
2. Centre for Natural Products Research and Drug Discovery, Department of Pharmacology, Faculty of Medicine, Universiti Malaya, 50603 Kuala Lumpur, Malaysia
3. Malaghan Institute of Medical Research, P.O. Box 7060, Wellington, New Zealand
4. National Institute of Water & Atmospheric Research (NIWA) Ltd, Private Bag 14-901, Kilbirnie, Wellington, New Zealand