1. Department of Chemistry, School of Science and Tchnology, Kwansei Gakuin University, Gakuen, Sanda, Hyogo 669-1337, Japan, Suntory Institute For Bioorganic Research, Wakayamadai, Shimamoto, Mishimagun, Osaka 618-8503, Japan, and Department of Physics and CREST/JST, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan