1. Department of Bioscience and Bioinformatics, Kyushu Institute of Technology, Iizuka 820-8502, Japan
2. Department of Chemistry, Graduate School of Science, Kyushu University, Fukuoka 819-0395, Japan
3. Toyota Physical & Chemical Research Institute, Aichi 480-1192, Japan
4. Institute for Molecular Science, Okazaki 444-8585, Japan