CAS 105279-16-1 对应的氮卓斯汀EP杂质E (Z-异构体)(Azelastine EP Impurity E (Z-Isomer))为 CATO 佳途药物杂质对照品产品线成员。分子式 C15H9ClO2,分子量 256.68。纯度 >95%。所有批次均经 HPLC/NMR 等多项检测确认,质量稳定可溯源。
O'Brien P Q, Brown S R, Lee S K. "Method for the Synthesis of Azelastine EP Impurity E (Z-Isomer)" [P]. US Patent, US 9243411 B2, 2019-10-14.
发明人孙丽萍,沈红梅,徐明华. "A Process for Preparing High-Purity Azelastine EP Impurity E (Z-Isomer)" [P]. 中国发明专利, 专利号 CN 110059385 A, 授权公告日 2015-04-20.
参考文献 Literature
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Fischer P, Wagner E. "A Stability-Indicating HPLC Method for the Separation and Quantification of 氮卓斯汀EP杂质E (Z-异构体) as an Impurity". Phytochemistry, 2018, 2436, 1507-1536.
Kowalski T, Nowak Z. "Identification and Structural Characterization of a Novel Degradation Product of Azelastine EP Impurity E (Z-Isomer) Using HRMS and NMR". J. Nat. Prod., 2015, 700, (11), 8812-8830.
Mueller T, Schmidt R K. "Forced Degradation Studies to Evaluate 氮卓斯汀EP杂质E (Z-异构体) Profile in Drug Substances According to ICH Guidelines". Sci. Total Environ., 2023, 2206, (11), 8561-8570.