Two novel cycloartane-type triterpene glycosides from the roots of Astragalus prusianus

Two novel cycloartane-type glycosides (1–2), 16-O-β-d-glucopyranosyl-20(S),24(R)-5(α),9-diepoxy-2α,3β,16β,25-tetrahydroxy-9,10-seco-cycloarta-1(10),6(7)-diene and 3-O-β-d-xylopyranosyl-16-O-β-d-glucopyranosyl-20(S),24(R)-epoxy-3β,16β,25-trihydroxycycloartane, were isolated from the roots of Astragalus prusianus. The 5α,9-epoxy structural feature in 1 is encountered for the first time.