[Study on the chemical components from the bark of Nothopanax davidii (Franch) harms]

Two new oleanane type triterpene glycosides, named yiyeliangwanoside I and yiyeliangwanoside II, were isolated from Nothopanax davidii (Franch) Harms (Araliaceae). Their chemical structures were elucidated by means of chemical and spectrometric analysis. Yiyeliangwanoside I: C57H88O25, a white powder, mp 203-205 degrees C (dec.), [alpha]D20-3.47(c 0.1, CH3OH). Its structure was determined as 3-O-alpha-(3',4'-O-dioic-acetyl)-L-arabinopyranosyl-3 beta-hydroxyolean-12-ene-28,29-dioic acid-28-O-[alpha-L-rhamnopyranosyl-(1----6)-beta-D-glycopyranosyl- (1----4)-beta-D-glycopyranosyl] ester. Yiyeliangwanoside II: C37H56O10, a white powder, mp 240-244 degrees C (dec.), [alpha]D20+36.5(c 0.1, CH3OH). Its structure was determined as 3-O-alpha-(3'-O-acetyl)-L-arabinopyranosyl-3 beta-hydroxyolean-12-ene-28,29-dioic acid.