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从广西产的虫牙药Ｉｓｏｄｏｎｔｅｒｎｉｆｏｌｉｕｓ（Ｄ．Ｄｏｎ）Ｋｕｄｏ的乙酸乙酯提取物中分离到９个单体成分，经鉴定其中两个为新的二萜化合物，命名为牛尾草甲素、乙素（ｉｓｏｄｏｔｅｒｎｉｆｏｌｉｎＡ，Ｂ），光谱数据分析和化学反应证明，甲素的结构为６β，１１α，１５β－ｔｒｉａｃｅｔｏｘｙ－７β－ｈｙｄｒｏｘｙ－７α，２０－ｅｐｏｘｙ－ｅｎｔｋａｕｒ－１６－ｅｎｅ，乙素的结构为１１αａｃｅｔｏｘｙ－６β，７β．１５β－ｔｒｉｈｙｄｒｏｘｙ－７α，２０－ｅｐｏｘｙ－ｅｎｔｋａｕｒ－１６－ｅｎｅ。其它成分分别鉴定为β－谷甾醇（β－ｓｉｔｏｓｔｅｒｏｌ），乌苏酸（ｕｒｓｏｌｉｃａｃｉｄ），齐墩果酸（ｏｌｅａｎｏｌｉｃａｃｉｄ），胡萝β甙（β－ｓｉｔｏｓｔｅｒｏｌ－β－Ｄ－ｇｌｕｃｏｐｙｒａｎｏｓｉｄｅ），６－甲基－三十二烷烃（６－ｍｅｔｈｙｌｄｏｔｒｉａｃｏｎｔａｎｅ），细叶香茶菜甲素（ｓｏｄｏｐｏｎｉｎ）和细叶香茶菜乙素（ｔｅｒｎｉｆｏｌｉｎ），其中６－甲基－三十二烷烃是首次从香茶菜属植物中分得。
Nine monomer components were isolated from the ethyl acetate extract of Isodonternifolius (D. Don) Kudo produced in Guangxi, and two of them were identified as new diterpenoid compounds named as Stellar A, B ( Isodoternifolin A, B), Spectroscopic data analysis and chemical reaction proved that the structure of A is 6β, 11α, 15β-triacetoxy-7β-hydroxy-7α, 20-epoxy-entkaur-16-ene, and the structure of B is 11αacetoxy-6β. , 7β. 15β-trihydroxy-7α, 20-epoxy-entkaur-16-ene. Other components were identified as β-sitosterol, ursolic acid, oleanolic acid, β-sitosterol-β-D-glucopyranoside, and 6-methyl - Twelve alkane (6-methyldotriacontane), sodoponin and ternifolin, of which 6-methyl-dicalkane is the first from the genus Cinnamomum The plants are divided.