1. Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan, Rigaku Corporation, Akishima, Tokyo 196-8666, Japan, Ideal Star Inc., Aoba-ku, Sendai 989-3204, Japan, and Idea International Corporation, Aoba-ku, Sendai 980-8579, Japan