Lee S K, Brown S R, Stevens L M. "一种的合成方法" [P]. US Patent, US 11262768 B2, 2019-07-19.
发明人张德明,林芳,赵玉洁. "Method for the Synthesis of 6-Methyl-4H,5H,6H,7H-pyrazolo[1,5-a]pyrimidine-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 114018713 A, 授权公告日 2019-04-03.
发明人韩伟,何建平,赵玉洁. "A Process for Preparing High-Purity 6-Methyl-4H,5H,6H,7H-pyrazolo[1,5-a]pyrimidine-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 113666222 A, 授权公告日 2017-11-13.
参考文献 Literature
O'Brien K, Kennedy M L. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". J. Chromatogr. A, 2021, 1481, (8), 4686-4691.
Lee J H, Choi Y S. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Anal. Methods, 2019, 882, 6139-6157.
Zhang Y, Li Q, Chen T. "Identification and Structural Characterization of a Novel Degradation Product of 6-Methyl-4H,5H,6H,7H-pyrazolo[1,5-a]pyrimidine-3-carboxylic acid Using HRMS and NMR". Biomed. Chromatogr., 2012, 1535, (11), 1443-1461.
Zhou X P, Huang L, Wu G. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". J. Sep. Sci., 2015, 447, 6622-6625.