A New Cycloartane Glycoside from the Aerial Part of Astragalus grahamianus

A new 9,19-cyclolanostane type arabinoside, 16,23;22,25-diepoxy-3 beta,22,23,24-tetrahydroxy-9,19-cyclolanostane-3-O-alpha-L-arabinopyranoside (1), together with two known compounds (2 and 3), was isolated from the aerial part of Astragalus grahamianus. The structures of these compounds were characterized and identified by 1D and 2D NMR spectroscopic techniques and HR-ESI-MS and by comparison of their spectral data with those reported in the literature. All these compounds are reported from this plant for the first time.