A new triterpenoid saponin from the leaves and stems of Panax quinquefolium L.

One new triterpenoid saponin, quinquenoside L17 (1), was isolated from the leaves and stems of Panax quinquefolium L., and its structure was elucidated as 20-O-[(β-d-xylopyranosyl-(1-6)-O-β-d-glucopyranosyl)]-6-O-β-d-glucopyranosyl-dammar-24-ene-3,6,12,20-tetraol, by the combination analysis of one-dimensional NMR and two-dimensional NMR, mass spectrometry, CD spectrum and chemical evidences.