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侧柏叶治疗慢性气管炎有一定疗效。我们在原侧柏叶提取物202片剂临床验证有效的基础上，继续进行了测柏叶有效成分的提取研究工作。现简要汇报如下。
Platycladus orientalis has a certain effect on the treatment of chronic bronchitis. Based on the clinical validation of the original Platycladus orientalis extract 202 tablet, we continued to carry out the research on the extraction of active ingredients from P. yechoensis leaves. The brief report is as follows.