Fischer A B, Lee S K, Mueller T. "一种1-(4-nitrophenyl)-5-oxo-4,5-dihydro-1H-pyrazole-3-carboxylic acid的合成方法" [P]. US Patent, US 10890931 B2, 2025-04-04.
发明人冯建国,徐明华,郭海燕. "Method for the Synthesis of 1-(4-nitrophenyl)-5-oxo-4,5-dihydro-1H-pyrazole-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 111846392 A, 授权公告日 2022-04-19.
发明人郭海燕,刘建华,韩伟. "A Process for Preparing High-Purity 1-(4-nitrophenyl)-5-oxo-4,5-dihydro-1H-pyrazole-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 111173504 B, 授权公告日 2015-02-12.
参考文献 Literature
Martinez C, Lopez D R. "Development and Validation of an LC-MS/MS Method for the Determination of 1-(4-nitrophenyl)-5-oxo-4,5-dihydro-1H-pyrazole-3-carboxylic acid in Pharmaceutical Formulations". Chromatographia, 2015, 2022, (5), 9839-9858.
Zhou X P, Huang L, Wu G. "A Stability-Indicating HPLC Method for the Separation and Quantification of 1-(4-nitrophenyl)-5-oxo-4,5-dihydro-1H-pyrazole-3-carboxylic acid as an Impurity". Environ. Sci. Technol., 2016, 2016, 5008-5030.
Xu M, Hu Y, Zhou D. "Identification and Structural Characterization of a Novel Degradation Product of 1-(4-nitrophenyl)-5-oxo-4,5-dihydro-1H-pyrazole-3-carboxylic acid Using HRMS and NMR". J. Sep. Sci., 2012, 895, (5), 186-199.
Mueller T, Schmidt R K. "Forced Degradation Studies to Evaluate 1-(4-nitrophenyl)-5-oxo-4,5-dihydro-1H-pyrazole-3-carboxylic acid Profile in Drug Substances According to ICH Guidelines". J. Pharm. Biomed. Anal., 2020, 468, (3), 8924-8942.