Two new dammarane-type triterpenoid saponins, namely ginsenosides Rb4 (1) and Rb5 (2), were isolated from ginseng medicinal fungal substance. The structures of 1 and 2 were established as 3β,12β,20(S)-trihydroxydammar-24(25)-ene-3-O-[α-d-glucopyranosyl-(1→4)-β-d-glucopyranosyl-(1→2)-β-d-glucopyranosyl]-20-O-β-d-glucopyranoside and 3β,12β,20(S)-trihydroxydammar-24(25)-ene-3-O-[α-d-glucopyranosyl-(1→4)-α-d-glucopyranosyl-(1→4)-β-d-glucopyranosyl-(1→2)-β-d-glucopyranosyl]-20-O-β-d-glucopyranoside on the basis of spectroscopic analysis and chemical analysis, respectively.
Keywords: Araliaceae; ginseng; ginsenoside Rb4; ginsenoside Rb5; triterpenoid saponin.