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The chemical structures of abrisaponins So1 (1), So2 (2), D2 (3), D3 (4), F (5) and SB (6), six of twenty-three saponins from Abri Herba, the whole plants of Abrus cantoniensis (Leguminosae), were investigated. They were elucidated to be 3-O-alpha-L-rhamnopyranosyl-(1 --&gt; 2)-[O-beta-D-glucopyranosyl-(1--&gt;3)]-beta-D-galactopyranosyl-(1 --&gt; 2)-beta-D-glucuronopyranosyl [sequence: see text] (designated as beta-abritetraosyl) sophoradiol (1), 3-O-beta-abritetraosyl sophoradiol 22-O-beta-D-xylopyranoside (2), 3-O-beta-abritetraosyl abrisapogenol D (3), O-beta-abritetraosyl abrisapogenol D 22-O-beta-D-glucopyranoside (4), 3-O-beta-abritetraosyl abrisapogenol F (5) and 3-O-beta-abritetraosyl soyasapogenol B (6), respectively.

Triterpene Saponins from Abrus cantoniensis(Leguminosae). II. Characterization of Six New Saponins Having a Branched-Chain Sugar.