Two new diphenyl ethers from the whole plant of Canscora lucidissima

Twelve compounds were isolated and purified from 95% ethanol extract of the whole plant of C. lucidissima by silica gel column chromatography, MCI column chromatography and ODS column chromatography, polyamide column chromatography, Sephadex LH-20 column chromatography, combined with semi-preparative HPLC methods. Based on the physicochemical properties and spectral data (UV, IR, MS, NMR), the structures of the isolates were identified as canlucdiphenyl ether A (1), canlucdiphenyl ether B (2), canlucbenzophenone A (3), (-)-pinoresinol (4), 3-hydroxybenzoic acid (5), 1, 3, 8-trihydroxy-6-hydroxymethylanthraquinone (6), dihydrokaempferol (7), 6, 7-dihydroxycoumarin (8), 4-hydroxy-3, 5-dimethoxybenzoic acid (9), 4-hydroxy-3, 5-dimethoxycinnamic acid (10), 2-hydroxy-3-methoxybenzoic acid (11), (-)-syringaresinol (12). Among them, compounds 1 and 2 are two new diphenyl ether and 3 is a new natural product. Compound 8 exhibited some anti-inflammatory activity by inhibiting the lipopolysaccharide-induced NO production in RAW264.7 cells.