A novel triterpenoid saponin, pseudo-ginsenoside-RI3, isolated from the rhizomes of Panax pseudo-ginseng subsp. himalaicus var. angustifolius has been characterized as 3-O-beta-D-glucopyranosyl(1----2)-beta-D-glucuronopyranosyl (1----6)-beta-D-glucopyranosyl 28-O-beta-D-xylopyranosyl-olean-12-en-28-oic acid ester by physicochemical methods.
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