Cyclotanoside, a New Cycloartane Glycoside from Flowers of Astragalus tanae

The new cycloartane glycoside cyclotanoside and the triterpene saponin astragaloside VIII were isolated from flowers of Astragalus tanae Sosn. Their structures were established as 9β,19-cyclolanost-12,24E-dien-1α,3β,6α,16β,27-pentaol-27-O-β-D-(6′-O-acetoxy)-galactopyranoside and 3-O-α-L-rhamnopyranosyl-(1→2)-O-β-D-xylopyranosyl-(1→2)-O-β-D-glucuronopyranosyl-soyasapogenol B.