1. Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Cádiz, Apdo. 40, 11510-Puerto Real, Cádiz, Spain; Southern School of Pharmacy, Mercer University, 3001 Mercer University Drive, Atlanta, Georgia, 30341-4155; Western Regional Plant Introduction Station, USDA, 59 Johnson Hall, WSU Campus, PO Box 646402, Pullman, WA 99164-6402; and HortResearch, Ruakura Research Centre, Ruakura, Hamilton, New Zealand