1. School of Pharmacy, Kumamoto University, 5–1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan
2. Crop Functionality and Utilization Research Team, National Agricultural Research Center for Kyushu Okinawa Region, 6651–2 Yokoichi, Miyakonojo, Miyazaki 885-0091, Japan
3. Upland Farming Research Division, National Agricultural Research Center for Hokkaido Region, 9–4 Shinsei Minami, Memuro, Kasai, Hokkaido 082-0081, Japan