1. College of Science and Technology, Nihon University, 1-8 Kanda Surugadai, Chiyoda-ku, Tokyo 101-8308, Japan, Department of Biochemistry, Kyoto Prefectural University of Medicine, Kamigyo-ku, Kyoto 602-0841, Japan, College of Pharmacy, Nihon University, 7-7-1 Narashinodai, Funabashi-shi, Chiba 274-8555, Japan, Morishita Jintan Co. Ltd., 1-30, Tamatsukuri 1-chome, Chuo-ku, Osaka 540-8566, Japan, and Central Research Laboratory, Kotaro Pharmaceutical Co. Ltd., Suga-cho 47-3, Takatsuki 569-0022, Japan