1. Department of Patho-Functional Bioanalysis, Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida-shimoadachi-cho, Sakyo-ku, Kyoto 606-8501, School of Pharmaceutical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8131, Department of Radiopharmaceutical Chemistry, Faculty of Pharmaceutical Sciences, Kumamoto University, Oe-Honmachi, Kumamoto 862-0973, Japan