Abstract
One new pepluane-type diterpenoid, pepluenone (1), and four known compounds were isolated from the whole plant of Euphorbia peplus L. Compound 1 possesses a 5/6/5/6 tetracyclic skeleton with a unique aromatic ring D. Its structure was determined based on spectroscopic data and X-ray crystallography. The biogenetic pathway of 1 was proposed, in which chemical transformation verified the aromatization step. In vitro anti-inflammatory activity tests indicated that Compounds 1 and 3 had a strong inhibitory effect on releasing NO from mouse macrophage RAW264.7 induced by LPS.
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