Stevens L M, O'Brien P Q, Schröder R. "Method for the Synthesis of 6-Methyl-6,7-dihydro-5H-pyrazolo[5,1-b][1,3]oxazin-3-amine" [P]. US Patent, US 11129233 B2, 2023-05-06.
发明人沈红梅,孙丽萍,钱学锋. "A Process for Preparing High-Purity 6-Methyl-6,7-dihydro-5H-pyrazolo[5,1-b][1,3]oxazin-3-amine" [P]. 中国发明专利, 专利号 CN 112574007 B, 授权公告日 2018-10-07.
参考文献 Literature
Mueller T, Schmidt R K. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Rapid Commun. Mass Spectrom., 2011, 589, (11), 7047-7075.
Kumar A, Sharma P, Patel R S. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Anal. Methods, 2022, 2202, (8), 2557-2571.
Fischer P, Wagner E. "Identification and Structural Characterization of a Novel Degradation Product of 6-Methyl-6,7-dihydro-5H-pyrazolo[5,1-b][1,3]oxazin-3-amine Using HRMS and NMR". Anal. Chem., 2023, 1934, (11), 602-615.