发明人钱学锋,马晓峰,何建平. "一种N/A的合成方法" [P]. 中国发明专利, 专利号 CN 109615582 A, 授权公告日 2020-07-27.
发明人周伟,朱建伟,唐晓军. "Method for the Synthesis of 5-(Pyridin-2-yl)-4H-1,2,4-triazole-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 114855580 B, 授权公告日 2020-05-09.
参考文献 Literature
Mueller T, Schmidt R K. "Development and Validation of an LC-MS/MS Method for the Determination of N/A in Pharmaceutical Formulations". J. Pharm. Biomed. Anal., 2024, 1900, (10), 4188-4213.
Kim S H, Park J Y. "A Stability-Indicating HPLC Method for the Separation and Quantification of N/A as an Impurity". J. Agric. Food Chem., 2010, 1186, (1), 5985-6005.
O'Brien K, Kennedy M L. "Identification and Structural Characterization of a Novel Degradation Product of 5-(Pyridin-2-yl)-4H-1,2,4-triazole-3-carboxylic acid Using HRMS and NMR". J. Chromatogr. A, 2013, 2316, 2161-2177.
Zhang Y, Li Q, Chen T. "Forced Degradation Studies to Evaluate N/A Profile in Drug Substances According to ICH Guidelines". Phytochemistry, 2013, 1200, 1367-1386.