Objective To establish the quality standards of Cynanchum auriculatum Royle ex Wight in Hubei province.
目的通过对湖北产耳叶牛皮消的品质评价，初步建立该药材的质量标准。
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The main results of this dissertation were described as following:The roots of C. auriculatum was extracted by ethanol through heating reflux, then purified by chemical extraction.