ent-Abietane-type diterpenoids from the roots of Euphorbia ebracteolata with their inhibitory activities on LPS-induced NO production in RAW 264.7 macrophages

Ten ent-abietane diterpenoids (1–10), including four new (1–4) and six known ones (5–10) were isolated from the roots of Euphorbia ebracteolata. Their structures were determined by 1D, 2D NMR, and HRESIMS. Compounds 2, 4, and 7 exhibited significant inhibitory activities on lipopolysaccharide (LPS)-induced nitric oxide production in RAW 264.7 macrophages with IC50 values of 0.69, 1.97, and 0.88 μM, respectively. A primary structure–activity relationship was also discussed.

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