Schröder R, Roberts E F, Klinger H. "Method for the Synthesis of (E)-4-((4-cyanophenyl)amino)-4-oxobut-2-enoic acid" [P]. US Patent, US 9526039 B2, 2022-12-26.
发明人朱建伟,胡光,何建平. "A Process for Preparing High-Purity (E)-4-((4-cyanophenyl)amino)-4-oxobut-2-enoic acid" [P]. 中国发明专利, 专利号 CN 114045347 A, 授权公告日 2023-11-04.
参考文献 Literature
Kim S H, Park J Y. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Anal. Methods, 2013, 1939, 8541-8556.
Yamamoto K, Tanaka H, Suzuki T. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Anal. Chem., 2025, 581, (4), 894-906.
Chen X Y, Liu M, Zhao W Q. "Identification and Structural Characterization of a Novel Degradation Product of (E)-4-((4-cyanophenyl)amino)-4-oxobut-2-enoic acid Using HRMS and NMR". Molecules, 2016, 2286, (2), 7328-7337.
Yang F, Sun W, Liu J. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". J. Sep. Sci., 2010, 577, 5040-5064.