杂质 impurities： 杂质在药学中是指药物中存在的无治疗作用或者影响药物的稳定性、疗效，甚至对人体的健康有害的物质。在药物的研究、生产、贮存和临床应用等方面，必须保持药物的纯度，降低药物的杂质，这样才能保证药物的有效性和安全性。
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![1369773-39-6|AHU377钙盐|calcium bis(3-{[(2S,4R)-1-{[1,1'-biphenyl]-4-yl}-5-ethoxy-4-methyl-5-oxopentan-2-yl]carbamoyl}propanoate)](https://images.chemany.com/attachments/products_new/svg/1369773-39-6.svg)
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![886538-48-3|莫那比拉韦杂质7|[(2R,3S,4R,5R)-5-(2,4-dioxo-1,2,3,4-tetrahydropyrimidin-1-yl)-3,4-dihydroxyoxolan-2-yl]methyl 2-methylpropanoate](https://images.chemany.com/attachments/products_new/svg/886538-48-3.svg)