1. Department of Chemistry, Faculty of Science, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan, Center for Integrative Bioscience, Okazaki National Research Institutes, Myodaiji, Okazaki, 444-8585, Japan, and Department of Chemistry, Graduate School of Science, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan