1. College of Science and Technology, Nihon University, 1-8 Kanda Surugadai, Chiyoda-ku, Tokyo 101-8308, Japan, Division of Natural Products Chemistry, Medical Research Institute, Colombo 98, Sri Lanka, Department of Biochemistry, Kyoto Prefectural University of Medicine, Kyoto 602-0841, Japan, College of Pharmacy, Nihon University, Chiba 274-8555, Japan, School of Pharmaceutical Sciences, Toho University, Chiba 274-8510, Japan, and Research Institute for Wakan-Yaku (Traditional Sino-Japanese Medicines),...