Klinger H, Roberts E F, Chen K W. "一种4-(chlorosulfonyl)-5-methyl-1H-pyrazole-3-carboxylic acid的合成方法" [P]. US Patent, US 9874268 B2, 2016-02-09.
Lee S K, Yamamoto T, O'Brien P Q. "Method for the Synthesis of 4-(chlorosulfonyl)-5-methyl-1H-pyrazole-3-carboxylic acid" [P]. US Patent, US 11430671 B2, 2016-06-23.
参考文献 Literature
Mueller T, Schmidt R K. "Development and Validation of an LC-MS/MS Method for the Determination of 4-(chlorosulfonyl)-5-methyl-1H-pyrazole-3-carboxylic acid in Pharmaceutical Formulations". Anal. Methods, 2022, 1989, 1594-1618.
Chen X Y, Liu M, Zhao W Q. "A Stability-Indicating HPLC Method for the Separation and Quantification of 4-(chlorosulfonyl)-5-methyl-1H-pyrazole-3-carboxylic acid as an Impurity". J. Nat. Prod., 2022, 930, (7), 2699-2727.
Martinez C, Lopez D R. "Identification and Structural Characterization of a Novel Degradation Product of 4-(chlorosulfonyl)-5-methyl-1H-pyrazole-3-carboxylic acid Using HRMS and NMR". J. Chromatogr. A, 2016, 491, 4200-4218.
Smith J A, Johnson M B. "Forced Degradation Studies to Evaluate 4-(chlorosulfonyl)-5-methyl-1H-pyrazole-3-carboxylic acid Profile in Drug Substances According to ICH Guidelines". J. Pharm. Biomed. Anal., 2017, 1889, (4), 6748-6776.