A new sesquiterpenoid dimer, lindenanolide I (1), and two new butanolides, (2E,3R,4S)-2-dodecylinene-3-hydroxy-4-ethoxy-4-methylbutanolide (3) and (2E,3R,4S)-2-tetradecylinene-3-hydroxy-4-ethoxy-4-methylbutanolide (4), together with five known compounds (2, 5–8), were isolated from the roots of Lindera chunii. The structures of these compounds were elucidated on the basis of extensive spectroscopic analysis and by comparison of the data with those of related secondary metabolites. The absolute configuration of 1 was identified by electronic circular dichroism (ECD) analysis. Compounds 5–8 were isolated from this plant for the first time.

中文翻译：

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木耳根的化学成分

一种新的倍半萜类二聚体，lindenanolide I (1) 和两种新的丁内酯，(2E,3R,4S)-2-dodecylinene-3-hydroxy-4-ethoxy-4-methylbutanolide (3) 和 (2E,3R,4S) -2-tetradecylinene-3-hydroxy-4-ethoxy-4-methylbutanolide (4)，连同五种已知化合物 (2, 5–8)，是从 Lindera chunii 的根中分离出来的。这些化合物的结构是基于广泛的光谱分析和数据与相关次生代谢物的数据比较而阐明的。通过电子圆二色性 (ECD) 分析确定了 1 的绝对构型。化合物5-8为首次从该植物中分离得到。