Chemical Constituents of Polar Solvent Fraction of Ostericum koreanum Leaves

Four chromone derivatives and one sesquiterpene glycoside were isolated from the n-BuOH fraction of the leaves of Ostericum koreanum. Based on spectral data analysis, the isolated compounds were identified as cimifugin (1), polymor-pholide-1-O-β-D-glucoside (2), prim-glucosylangelicin (3), 5,7-dihydroxy-4-oxo-4H-chromene-2-carboxylic acid (4), and dviaricatiacid (5). We revised several carbon chemical shifts for compound 3. Among these, compound 4 was isolated from a plant source for the first time, and compounds 2, 3, and 5 were also isolated from O. koreanum for the first time.