Chemical Constituents of the Roots of Lindera chunii

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.