Two new dammarane-type sapogenins from Gynostemma pentaphyllum

Two new sapogenins, named (20S, 24R)-3β,20,21β,25-tetrahydroxy-21,24-cyclodammarane (1) and 3β-hydroxyetio-17β-dammaranic acid (2), were isolated from the alkaline hydrolysate of Gynostemma pentaphyllum saponins. Their structures were elucidated by spectroscopic methods.