1. Department of Chemistry, School of Molecular and Microbial Science, The University of Queensland, St. Lucia 4072, Australia; Centre for Magnetic Resonance, The University of Queensland, St. Lucia 4072, Australia; Department of Primary Industries and Fisheries, GPO Box 46, Brisbane, Queensland 4001, Australia; Department of Zoology and Entomology, The University of Queensland, St. Lucia 4072, Australia; and Bureau of Sugar Experiment Stations, P.O. Box 86, Indooroopilly, Queensland 4068, Australia