1. Biomacromolecules Research Team, RIKEN Center for the Sustainable Resource Sciences, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
2. Advanced NMR Application and Platform Team, NMR Research and Collaboration Group, NMR Science and Development Division, RIKEN SPring-8 Center, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
3. Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyotodaigaku,
Katsura, Kyoto 615-8510, Japan
4. Institute for Advanced Bioscience, Keio University, 403-1 Nihonkoku, Daihouji, Tsuruoka, Yamagata 997-0017, Japan