1. Laboratory of Medicinal Pharmacognosy, School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, Horinouchi 1432-1, Hachiouji, Tokyo 192-0392, Japan, and Faculty of Pharmaceutical Sciences, Teikyo University, Suarashi 1091-1, Sagamiko, Tsukui-gun, Kanagawa 199-0195, Japan