1. Department of Chemistry and
Chemical Biology, Graduate School of Engineering, Gunma University,
1-5-1 Tenjin-cho, Kiryu 376-8515, Japan
2. Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
3. The Open University of Japan, Wakaba 2-11, Mihama-ku, Chiba 261-8586, Japan