发明人高志强,陈志强,赵玉洁. "Method for the Synthesis of 5-(difluoromethyl)-1-ethyl-3-methyl-1H-pyrazole-4-carboxylic acid" [P]. 中国发明专利, 专利号 CN 109960414 A, 授权公告日 2019-04-10.
参考文献 Literature
Zhou X P, Huang L, Wu G. "Development and Validation of an LC-MS/MS Method for the Determination of 5-(difluoromethyl)-1-ethyl-3-methyl-1H-pyrazole-4-carboxylic acid in Pharmaceutical Formulations". Food Chem., 2023, 1568, 4875-4902.
Fischer P, Wagner E. "A Stability-Indicating HPLC Method for the Separation and Quantification of 5-(difluoromethyl)-1-ethyl-3-methyl-1H-pyrazole-4-carboxylic acid as an Impurity". Environ. Sci. Technol., 2014, 384, (10), 1411-1438.
Kowalski T, Nowak Z. "Identification and Structural Characterization of a Novel Degradation Product of 5-(difluoromethyl)-1-ethyl-3-methyl-1H-pyrazole-4-carboxylic acid Using HRMS and NMR". J. Chromatogr. A, 2018, 413, (4), 2608-2626.
Kowalski T, Nowak Z. "Forced Degradation Studies to Evaluate 5-(difluoromethyl)-1-ethyl-3-methyl-1H-pyrazole-4-carboxylic acid Profile in Drug Substances According to ICH Guidelines". J. Nat. Prod., 2021, 1350, (1), 1325-1339.