1. Centre for Pharmacognosy and Phytotherapy, The School of Pharmacy, University of London, 29-39 Brunswick Square, London WC1N 1AX, U.K., Herbarium, Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3DS, U.K., and Chemistry M313, School of Biomedical, Biomolecular & Chemical Sciences, University of Western Australia, Crawley, 6009, Western Australia, Australia