1. School of Pharmacy, Shujitsu University, 1-6-1 Nishigawara, Okayama 703-8516, Japan
2. Research and Development Division, Oryza Oil and Fat Chemical Co. Ltd., 1 Numata, Kitagata-cho, Ichinomiya-shi, Aichi 493-8001, Japan
3. Okayama Prefectural Technology Center for Agriculture, Forestry, and Fisheries, Research Institute for Biological Sciences (RIBS), 7549-1 Yoshikawa, Kibi-chuo, Okayama 716-1241, Japan