1. Grupo de Biotecnología-Productos Naturales, Escuela de Tecnología Química, Universidad Tecnológica de Pereira, La Julita, A. A. 97 Pereira, Colombia, Laboratory of Medicinal Pharmacognosy, Tokyo University of Pharmacy and Life Science, School of Pharmacy, 1432-1, Horinouchi, Hachioji, Tokyo 192-0392, Japan, and Department of Dental Pharmacology, Meikai University School of Dentistry, 1-1, Keyaki-dai, Sakado, Saitama 350-0283, Japan