1. Department of Molecular Science and Technology, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan, Department of Chemistry, Graduate School of Science, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan, National Institute of Bio-science and Human-Technology, Tsukuba, Ibaragi 305-0046, Japan, and Department of Chemistry, Kyushu University, Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan