Abstract The phytochemical study of the chloroform extract of the aerial parts of Inula bifrons (L.) L. led to the isolation of one new ent-kaurane diterpenes acid along with twelve known compounds (two ent-kaurane diterpenoids, an eudesmane acid, five sesquiterpene lactones, three triterpenoids and β-sitosterol). All known compounds are found for the first time in I. bifrons. Their structures were elucidated by using spectral methods (NMR, HRESIMS and IR). The distribution of these compounds in the genus Inula and their chemotaxonomic significance is discussed.

中文翻译：

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一种来自 Inula bifrons 地上部分的新 ent-kaur-16-en-19-oic 酸

摘要 对 Inula bifrons (L.) L. 地上部分氯仿提取物的​​植物化学研究导致分离出一种新的 ent-kaurane 二萜酸以及 12 种已知化合物（两种 ent-kaurane 二萜、一种eudesmane 酸、五种倍半萜内酯、三种三萜和 β-谷甾醇）。所有已知化合物都是首次在 I. bifron 中发现。通过使用光谱方法（NMR、HRESIMS 和IR）阐明了它们的结构。讨论了这些化合物在 Inula 属中的分布及其化学分类学意义。