1. Research & Development Center, Nagase & Co., Ltd. 2-2-3 Murotani, Nishi-ku, Kobe, Hyogo 651-2241, Japan, Faculty of Symbiotic Systems Science, Fukushima University, 1 Kanayagawa, Fukushima, Fukushima 960-1296, Japan, Medicinal Chemistry Group I, Chemistry Research Laboratories, Dainippon Sumitomo Pharma Co., Ltd., Enoki 33-94, Suita, Osaka 564-0053, Japan, Department of Applied Biological Science, Faculty of Life Science, Fukuyama University, 1 Sanzo, Gakuen-cho, Fukuyama, Hiroshima 729-0292, Japan