1. Institute for Bee Products & Health Science, Yamada Bee Company, Inc., 194 Ichiba, Kagamino-cho, Okayama 708-0393, Japan
2. Laboratory of Applied Pharmacology, Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
3. Molecular Structure Characterization Unit, RIKEN Center for Sustainable Resource Science, Wako, Saitama 351-0198, Japan