Abstract
A new ocotillol-type triterpenoid saponin, named 20(R)-pseudoginsenoside F11 (1), was isolated along with pseudoginsenoside F11 (2) from red American ginseng. The structure of the new saponin was elucidated as 6-O-[α-L-rhamnopyranosyl-(1 → 2)-β-D-glucopyranosyl]-dammar-20R, 24R-epoxy-3β, 6α, 12β, 25-tetraol by a combination analysis of NMR and mass spectrometry. The complete signal assignments of the two compounds were carried out by means of 2-D NMR spectral analysis.
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