1. Graduate School of Pharmaceutical Sciences, University of Tokushima, Shomachi 1-78, Tokushima 770-8505, Japan, Faculty of Pharmaceutical Sciences, Niigata University of Pharmacy and Applied Life Sciences, Higashijima 265-1, Niigata 956-8603, Japan, Faculty of Pharmaceutical Sciences, Fukuoka University, Fukuoka 814-0180, Japan, Kitami Institute of Technology, Kitami, Hokkaido 090, Japan, and Kobe Pharmaceutical University, Motoyamakita-machi 4-19-1, Higashinada-ku, Kobe 658-8558, Japan