Williams B T, Johnson M A, Fischer A B. "Method for the Synthesis of 3-Bromo-6-chloro-1H-pyrazolo[3,4-d]pyrimidin-4(5H)-one" [P]. US Patent, US 11844750 B2, 2019-11-14.
发明人冯建国,胡光,孙丽萍. "A Process for Preparing High-Purity 3-Bromo-6-chloro-1H-pyrazolo[3,4-d]pyrimidin-4(5H)-one" [P]. 中国发明专利, 专利号 CN 117644796 B, 授权公告日 2017-04-09.
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". Anal. Chem., 2012, 98, (10), 2258-2279.
Brown R C, Davis S M. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Rapid Commun. Mass Spectrom., 2013, 883, 3762-3777.
Yang F, Sun W, Liu J. "Identification and Structural Characterization of a Novel Degradation Product of 3-Bromo-6-chloro-1H-pyrazolo[3,4-d]pyrimidin-4(5H)-one Using HRMS and NMR". J. Pharm. Biomed. Anal., 2020, 1899, (2), 445-468.
Brown R C, Davis S M. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". Talanta, 2018, 277, 5593-5600.