Three new compounds from (Wall.) Lindl.

In this study, three new compounds, roxburic acid A () and two flavone glycosides isorhamnetin-3--rhamnosyl-(1→6)--glucopyranose-(1→3)--glucopyranoside (), and kaempferol-7--glucopyranosyl-(1→3)--glucopyranoside () were isolated from an ethanol extract of the fresh (Wall.) Lindl., together with 10 known compounds (). The structures of these compounds were comprehensively characterized by HR-ESI-MS, H NMR, C NMR, and 2 D-NMR. The DPPH free radical scavenging activity of the isolated compounds was evaluated, and the results showed that kaempferol--glucopyranosyl- (1→3) --glucopyranoside () and rutin () has the potential antioxidant activity with IC values of 139 μg/mL and 22.5 μg/mL respectively.