OBJECTIVE To investigate the chemical constituents of Hedyotis diffma Willd. METHODS Compounds were isolated bv column chromatography of silica and HPI.C, and the structures were identified by spectral analysis.RESULTS Six compounds were isolated and elucidated as quercetin-3-0-[2-0-(6-O-E-sinapoyl)-β-D-glucopyranosyl]-β-D-glucopyranoside( 1 ); kaempferol-3-O-L 2-O-( 6-O- E-feruloyl )-β-D-glucopyranosyl ]-β-D-galactopyranoside ( 2 ) ; quercetin-3-O-[ 2-0-( 6-0-E-feruloyl )-β-D-gluoopyranusvl [-β[- D-glucopy...