1. School of Chemistry, The University of New South Wales, Sydney NSW-2052, Australia
2. Dpto. Biología Vegetal I (Botánica), Facultad de Biología, Universidad Complutense de Madrid, 28040-Madrid, Spain
3. Botany, School of Rural Science & Natural Resources, University of New England, Armidale NSW 2351, Australia
4. Phytochemical Services, 254 Quarter Sessions, Road, Westleigh, NSW 2120, Australia