| 摘要 |
NEW MATERIAL:The compound of formula I [R<11>-R<13> are H, galloyl group of formula II or group of formula III (the substituent group is bonded at arbi trary two positions; R<6> and R<7> are H or group of formula IV); R<14> is (di) hexahydroxydiphenol.glucose residue], formula V (R<21>-R<24> are H, methyl or group of formula II), formula VI (R<31>-R<34> are H or group of formula II) or formula VII. EXAMPLE:2,3-Hexahydroxydiphenoyl-6-O-galloyl-glucose. USE:An antienzyme agent useful as a drug. PREPARATION:The raw herb such as URAJIRO-GASHI (bark of Quercus salicina), KEIHI (bark of Cinnamomum cassia), etc., is extracted with acetone. The extract is partitioned with ethyl acetate and water, and the obtained ethyl acetate layer is purified by column chromatography to obtain the objective compound.
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