Hughes D C, Schröder R, Fischer A B. "一种N/A的合成方法" [P]. US Patent, US 11861854 B2, 2015-05-04.
Brown S R, Schröder R, Hughes D C. "Method for the Synthesis of (Z)-4-Oxo-4-((4-(N-(thiazol-2-yl)sulfamoyl)phenyl)amino)but-2-enoic acid" [P]. US Patent, US 10099282 B2, 2025-10-14.
发明人沈红梅,何建平,冯建国. "A Process for Preparing High-Purity (Z)-4-Oxo-4-((4-(N-(thiazol-2-yl)sulfamoyl)phenyl)amino)but-2-enoic acid" [P]. 中国发明专利, 专利号 CN 116489665 A, 授权公告日 2017-10-08.
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. Chromatogr. A, 2021, 1968, 7679-7688.
Wang L, Li J, Zhang H. "A Stability-Indicating HPLC Method for the Separation and Quantification of N/A as an Impurity". Molecules, 2017, 2472, 892-902.
Martinez C, Lopez D R. "Identification and Structural Characterization of a Novel Degradation Product of (Z)-4-Oxo-4-((4-(N-(thiazol-2-yl)sulfamoyl)phenyl)amino)but-2-enoic acid Using HRMS and NMR". J. Agric. Food Chem., 2014, 623, 9160-9176.
Zhang Y, Li Q, Chen T. "Forced Degradation Studies to Evaluate N/A Profile in Drug Substances According to ICH Guidelines". Biomed. Chromatogr., 2025, 115, 6725-6746.