1. Department of Chemistry, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan, Tsukuba Research Institute, Sekisui Medical Co., Ltd., 3-3-1 Koyodai, Ryugasaki, Ibaraki 301-0852, Japan, and GASTEC Co., 8-8-6 Fukayanaka, Ayase, Kanagawa 252-1195, Japan