Các hợp chất flavon glycosid phân lập từ lá cây vam (Diospyros dictyonema Hiern.)

Four flavone glycosides were isolated from the methanol extracts of the Diospyrds dictyonema leaves. Structural elucidation by NMR and ESI-mass spectral data in reference to the literatural values identified them to be kaempferol 3-0-[2,3-bis-( 4-hydroxy-E- cinnamoyl)-alpha-L -rhamnopyranoside] (1), keampferol 3-0-alpha-L-rhamnopyranoside (2), kaempferol 3-0-(2 "-0- beta-D-glucopyranosyl)-alpha-L-rhamnopyranoside (3) and quercetin-(2"-O-beta-glucopyranosyl)-a-L-rhamnopyranoside (4). Of them, compound (1) and (2) have been reported to exhibit cytotoxic activity against some cel lined and anti-inflammatory activity, respectively. These compounds were isolated from Diospyros dictyonema for the first time.