1. Faculty of Pharmacy, Meijo University, Yagoto, Tempaku-ku, Nagoya 468-8503, Japan, Osaka University of Pharmaceutical Sciences, 4-20-1, Nasahara, Takatsuki, Osaka, 569-1094, Japan, Faculty of Agriculture, Shizuoka University, Shizuoka 422-8529, Japan, Gifu Pharmaceutical University, 6-1 Mitahora-higashi 5-chome, Gifu 502-8585, Japan, and Department of Pharmacognosy, Faculty of Pharmacy, University of Karachi, Karachi-75270, Pakistan