1. Department of Biochemistry, Showa University School of Dentistry (Te.S., C.M., M.I., Ta.S.), 1–5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555
2. Department of Biochemistry, School of Pharmacy, Tokyo University of Pharmacy and Life Science (C.M., M.I.), Tokyo 192-0392
3. Discovery Research Laboratory I, Minase Research Institute, Ono Pharmaceutical Co. Ltd. (T.M.), Osaka 618-8585
4. Department of Physiological Chemistry, Faculty of Pharmaceutical Science (Y.S., A.I.), Kyoto 606-8501
5. Department of Pharmacology, Faculty of Medicine (F.U., S.N.), Kyoto University, Kyoto 606-8501, Japan