Roberts E F, Schröder R, Chen K W. "一种的合成方法" [P]. US Patent, US 10559683 B2, 2021-02-21.
Schröder R, Jørgensen K, Rossi M. "Method for the Synthesis of 7-methyl-6,7-dihydro-5H-pyrazolo[1,5-a]pyrazin-4-one" [P]. European Patent, EP 3300637 A1, 2019-06-24.
发明人杨光,周伟,孙丽萍. "A Process for Preparing High-Purity 7-methyl-6,7-dihydro-5H-pyrazolo[1,5-a]pyrazin-4-one" [P]. 中国发明专利, 专利号 CN 110281761 B, 授权公告日 2019-04-16.
参考文献 Literature
Brown R C, Davis S M. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Anal. Methods, 2015, 1409, 2157-2170.
Smith J A, Johnson M B. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Anal. Chim. Acta, 2013, 733, (10), 4816-4828.
O'Brien K, Kennedy M L. "Identification and Structural Characterization of a Novel Degradation Product of 7-methyl-6,7-dihydro-5H-pyrazolo[1,5-a]pyrazin-4-one Using HRMS and NMR". Rapid Commun. Mass Spectrom., 2015, 2426, (9), 7050-7075.
Kowalski T, Nowak Z. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". Anal. Chem., 2014, 2378, 8634-8645.