STUDIES ON THE CONSTITUENTS OF ASTER-TATARICUS L F .3. STRUCTURES OF ASTER SAPONIN-E AND ASTER SAPONIN-F ISOLATED FROM THE ROOT

Two new oleanane-type triterpene glycosides, aster saponins E and F, were isolated from the less polar saponin fraction of the root of Aster tataricus L. f. (Compositae), and their structures were elucidated on the basis of spectral evidence and by correlation to the other aster saponins reported earlier. Aster saponin E is 3-O-[O-α-L-arabinopyranosyl-(l→6)-β-D-glucopyranosyl]-2β,3β,16α-trihydroxyolean-12-en-28-oic acid (asterogenic acid) 28-[O-β-D-xy-lopyranosyl-(1→3)-O-α- L-arabinopyranosyl-(1→4)-O-α- L-rhamnopyranosyl-(1→2)-β- D-xylopyranosyl] ester. Aster saponin F is a 3β,16α-dihydroxyolean-12-en-28-oic acid (echinocystic acid) glycoside, the sugar moiety of which is the same as that of aster sanonin E. © 1990, The Pharmaceutical Society of Japan. All rights reserved.