1. Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto Daigaku Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
2. Biomacromolecules Research Team, RIKEN Center for Sustainable Resource Science, 2-C1 Hirosawa, Wako, Saitama 351-0198, Japan
3. Japan Synchrotron Radiation Research Institute, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan