Two new dammarane-type triterpene saponins from red American ginseng.

摘要

Two new dammarane-type triterpene saponins were isolated from the red American ginseng. The new saponins were named as pseudoginsenoside G(1) and pseudoginsenoside G(2). Their structures were elucidated by the combined analysis of NMR and mass spectrometry as 3-O-[beta-d-glucopyranosyl-(1 --> 2)-beta-d-glucopyranosyl]-dammar-12-one-20S,24R-epoxy-3beta,25-diol (pseudoginsenoside G(1)) (1) and 3-O-[beta-d-glucopyranosyl-(1 --> 2)-beta-d-glucopyranosyl]-dammar-12-one-20S,24S-epoxy-3beta,25-diol (pseudoginsenoside G(2)).