Martínez F, Rossi M, Sørensen M. "Method for the Synthesis of 3-Methyl-4-(thiophen-2-yl)-1H-pyrazol-5-amine hydrochloride" [P]. European Patent, EP 3712303 A1, 2019-09-12.
Chen K W, Brown S R, Park J H. "A Process for Preparing High-Purity 3-Methyl-4-(thiophen-2-yl)-1H-pyrazol-5-amine hydrochloride" [P]. US Patent, US 9467204 B2, 2015-02-25.
参考文献 Literature
Yamamoto K, Tanaka H, Suzuki T. "Development and Validation of an LC-MS/MS Method for the Determination of N/A in Pharmaceutical Formulations". J. Pharm. Biomed. Anal., 2020, 604, (3), 1410-1432.
Yang F, Sun W, Liu J. "A Stability-Indicating HPLC Method for the Separation and Quantification of N/A as an Impurity". J. Chromatogr. A, 2018, 950, 5754-5783.
Zhang Y, Li Q, Chen T. "Identification and Structural Characterization of a Novel Degradation Product of 3-Methyl-4-(thiophen-2-yl)-1H-pyrazol-5-amine hydrochloride Using HRMS and NMR". Food Chem., 2017, 301, (6), 8259-8276.
Kowalski T, Nowak Z. "Forced Degradation Studies to Evaluate N/A Profile in Drug Substances According to ICH Guidelines". J. Agric. Food Chem., 2012, 2307, 1470-1493.