发明人朱建伟,刘建华,钱学锋. "Method for the Synthesis of Losartan Impurity 21" [P]. 中国发明专利, 专利号 CN 111487071 A, 授权公告日 2021-09-25.
O'Brien P Q, Anderson J P, Yamamoto T. "A Process for Preparing High-Purity Losartan Impurity 21" [P]. US Patent, US 9008485 B2, 2025-12-20.
参考文献 Literature
Wang L, Li J, Zhang H. "Development and Validation of an LC-MS/MS Method for the Determination of 氯沙坦杂质21 in Pharmaceutical Formulations". Anal. Chem., 2015, 1933, (7), 9797-9801.
Martinez C, Lopez D R. "A Stability-Indicating HPLC Method for the Separation and Quantification of 氯沙坦杂质21 as an Impurity". Chromatographia, 2020, 1578, 7418-7422.
Wang L, Li J, Zhang H. "Identification and Structural Characterization of a Novel Degradation Product of Losartan Impurity 21 Using HRMS and NMR". J. Sep. Sci., 2010, 661, (7), 8287-8315.
Xu M, Hu Y, Zhou D. "Forced Degradation Studies to Evaluate 氯沙坦杂质21 Profile in Drug Substances According to ICH Guidelines". Chemosphere, 2020, 2367, (10), 3220-3244.