1. Laboratory of Organic Chemistry, Department of Organic and Medicinal Chemistry, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan, Laboratory of Hygienic Chemistry and Molecular Toxicology, Department of Biopharmaceutical Sciences, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan, and Ogaki Plant Sangyou, 3-38-1 Mangoku, Ogaki-shi, Gifu 503-0812, Japan