Hughes D C, Stevens L M, Kumar R. "Method for the Synthesis of 2-Methyl-6,7-dihydro-5H-pyrazolo[5,1-b][1,3]oxazine-3-carboxylic acid" [P]. US Patent, US 9234092 B2, 2022-02-09.
发明人胡光,刘建华,李文辉. "A Process for Preparing High-Purity 2-Methyl-6,7-dihydro-5H-pyrazolo[5,1-b][1,3]oxazine-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 111157195 B, 授权公告日 2015-01-26.
参考文献 Literature
Chen X Y, Liu M, Zhao W Q. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Anal. Chim. Acta, 2011, 632, 5083-5101.
Kowalski T, Nowak Z. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Anal. Methods, 2021, 1777, 4399-4414.
O'Brien K, Kennedy M L. "Identification and Structural Characterization of a Novel Degradation Product of 2-Methyl-6,7-dihydro-5H-pyrazolo[5,1-b][1,3]oxazine-3-carboxylic acid Using HRMS and NMR". J. Chromatogr. A, 2016, 1742, 4569-4576.
Zhang Y, Li Q, Chen T. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". Biomed. Chromatogr., 2012, 541, 1664-1678.