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, and Hort Research, Ruakura Research Centre, Ruakura, Hamilton, New Zealand