NEW MATERIAL:A compound shown by formula I (G is galloyl shown by formula II). USE:An antiallergic agent and an antiviral agent. PREPARATION:For example, sanguisorba Radix is extracted with aqueous acetone and acetone is distilled away. Then, the residue is partitioned with ethyl acetate and a water-soluble substance is collected, incorporated with sellaite and air-dried. The prepared substance is packed into a column and eluted with acetone to give an acetone-soluble substance. This substance is separated and purified by liquid chromatography.
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