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Pyrus bretschneideri Rehd. belongs to the genus Pyrus, a member of Rosaceae family. It is a routine edible fruit, and also used as a folk medicine to treat cough, eliminate constipation, and relieve alcoholism. In order to clarify the active compounds of P. bretschneideri, the phytochemical study were performed. Five compounds were isolated and identified as 2β,19α-dihydroxy ursolic acid, quercitrin,...
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