1. Department of Chemistry, University of Tsukuba, Tsukuba 305-8571, Japan
2. Tsukuba Research Center for Energy Materials Science (TREMS), University of Tsukuba, Tsukuba 305-8571, Japan
3. Life Science Center for Survival Dynamics, Tsukuba Advanced Research Alliance (TARA), University of Tsukuba, Tsukuba 305-8577, Japan
4. NMR Division, RIKEN SPring-8 Center, RIKEN, Suehiro-cho, Tsurumi-ku, Yokohama 230-0045, Japan
5. Graduate School of Science and Technology, Hirosaki University, Hirosaki 036-8561, Japan
6. Food Research Institute, NARO, Tsukuba 305-8642, Japan