1. Chemistry Laboratory, Pharmaceuticals Research Division, Mitsubishi Pharma Corporation, 1000, Kamoshida-cho, Aoba-ku, Yokohama, 227-0033, Japan.
2. Research Laboratory III (Immunology), Pharmaceuticals Research Division, Mitsubishi Pharma Corporation, 1000, Kamoshida-cho, Aoba-ku, Yokohama, 227-0033, Japan.