Two New Dammarane-type Saponins from Leaves of Panax Quinquefolium

Two new saponins were isolated from the leaves of Panax quinquefolium and their structures were elucidated as 3β, 6α, 20S-trihydroxy-12β, 23R-epoxydammar-24-ene 6-O-[α-L-rhamnosyl(1 → 2)-β-D-glucopyranosyl]-20-O-β-D-glucopyranoside (1) and 3β, 20S-dihydroxy-12β, 23R-epoxydammar-24-ene 3-O-[β-D-glucopyranosyl(1 → 2)-β-D-glucopyranosyl]-20-O-β-D-glucopyranoside (2) on the basis of physicochemical evidence.