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A new isoflavonoside, 7-hydroxy4’-methoxy-isoflavonone-7-0-β-D-glucopyranosyl(1-6)-β -D-glucoppooside was isolated from roots of Bupleurum scorzonerifolium Willd., andnamed as saikoisoflavonoside A. Thestruture was deteermined by spectroscopic methods.