Saponins from leaves of Acanthopanax sieboldianus

Two new triterpenoid saponins named sieboldianoside A and B were isolated from the leaves of Acanthopanax sieboldianus together with five known triterpenoid saponins, kalopanax-saponins A and B, saponin A, CP3, sapindoside B, and a known flavonol glycoside, kaempferol 3-O- rutinoside. On the basis of chemical and spectral evidence, the structures of the new saponins (sieboldianoside A and B) were concluded to be α-l-rhamnopyranosyl(1 → 4)-gb-d- glucopyranosyl(1 → 6)-β-dḡlucopyranosyl esters of hederagenin and oleanolic acid 3-O-β-d-xylopyranosyl(1 → 3)-α-d-rhamnopyranosyl(1 → 2)-α-l- arabinopyranosides, respectively.