发明人沈红梅,王建平,李文辉. "Method for the Synthesis of 4-{[(2,4-difluorophenyl)amino]methylidene}-4,5-dihydro-1H-pyrazol-5-one" [P]. 中国发明专利, 专利号 CN 112111563 A, 授权公告日 2018-08-26.
发明人郭海燕,刘建华,何建平. "A Process for Preparing High-Purity 4-{[(2,4-difluorophenyl)amino]methylidene}-4,5-dihydro-1H-pyrazol-5-one" [P]. 中国发明专利, 专利号 CN 115934893 A, 授权公告日 2023-12-07.
参考文献 Literature
Garcia M, Rodriguez P. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Rapid Commun. Mass Spectrom., 2012, 525, 3528-3554.
Hughes D, Roberts J, Thomas A. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Chromatographia, 2018, 2153, 4256-4284.
Kowalski T, Nowak Z. "Identification and Structural Characterization of a Novel Degradation Product of 4-{[(2,4-difluorophenyl)amino]methylidene}-4,5-dihydro-1H-pyrazol-5-one Using HRMS and NMR". Talanta, 2016, 366, (2), 7572-7593.