发明人李文辉,林芳,郑宇鹏. "Method for the Synthesis of Methotrexate Impurity N5" [P]. 中国发明专利, 专利号 CN 114073480 A, 授权公告日 2021-07-13.
Klinger H, Davis P L, Anderson J P. "A Process for Preparing High-Purity Methotrexate Impurity N5" [P]. US Patent, US 10660932 B2, 2019-08-19.
参考文献 Literature
Yang F, Sun W, Liu J. "Development and Validation of an LC-MS/MS Method for the Determination of 甲氨蝶呤杂质N5 in Pharmaceutical Formulations". Anal. Methods, 2024, 2458, 2387-2396.
Martinez C, Lopez D R. "A Stability-Indicating HPLC Method for the Separation and Quantification of 甲氨蝶呤杂质N5 as an Impurity". J. Pharm. Biomed. Anal., 2023, 1779, (4), 2964-2993.
Yang F, Sun W, Liu J. "Identification and Structural Characterization of a Novel Degradation Product of Methotrexate Impurity N5 Using HRMS and NMR". Anal. Chem., 2024, 940, (3), 937-966.
Zhang Y, Li Q, Chen T. "Forced Degradation Studies to Evaluate 甲氨蝶呤杂质N5 Profile in Drug Substances According to ICH Guidelines". J. Chromatogr. A, 2010, 2196, (8), 7420-7427.