[A new flavonoid from heartwood of Caesalpinia sappan].

Objective: To seek for new active components from Caesalpinia sappan.

Method: The chemical constituents were isolated and identified by means of chromatographic and spectroscopic technologies methods.

Result: Nine compounds were isolated, and their structures were identified as 3, 8-dihydroxy4, 10-dimethoxy-7-oxo-[2] benzopyrano[4,3-b] benzopyran (1), 3-deoxysappanchalcone (2), sappanchalcone (3), 3-deoxysappanone B (4), rhamnetin (5), protosappanin C (6), 3, 7-dihydroxy-chroman-4-one (7), dimethyl adipate (8), daucosterin (9).