Abstract
A new 3,4-seco-labdane diterpenoid, 3,4-seco-12R,13S-dihydroxy-4(18),8(17),14(15)-labdatrien-3-oic acid (1), was isolated from the leaves of Callicarpa nudiflora. The structure of 1 was elucidated by 1D NMR, 2D NMR and HRESIMS data, and confirmed by single-crystal X-ray diffraction analysis. 3,4-seco-12R,13S-Dihydroxy-4(18),8(17),14(15)-labdatrien-3-oic acid (1) exerted inhibitory activity against the production of nitric oxide in RAW264.7 stimulated by lipopolysaccharide.
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