1 Faculty of Pharmacy, Keio University, 1-5-30 Shibakoen, Minato-ku, Tokyo, 105-8512, Japan.
2 Research Center for Medicinal Plant Resources, National Institute of Biomedical Innovation, Health and Nutrition, 1-2 Hachimandai, Tsukuba, Ibaragi, 305-0843, Japan.
3 Faculty of Pharmacy, Keio University, 1-5-30 Shibakoen, Minato-ku, Tokyo, 105-8512, Japan. kiuchi-fm@pha.keio.ac.jp.