Johnson M A, Fischer A B, Thompson G K. "一种的合成方法" [P]. US Patent, US 9482667 B2, 2019-12-16.
发明人周伟,黄志刚,杨光. "Method for the Synthesis of 5,5-difluoro-1,3-dimethyl-7H-pyrazolo[3,4-b]pyridine-4,6-dione" [P]. 中国发明专利, 专利号 CN 115491195 B, 授权公告日 2019-02-01.
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". Sci. Total Environ., 2019, 2075, (11), 7780-7799.
O'Brien K, Kennedy M L. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Rapid Commun. Mass Spectrom., 2013, 496, (4), 3008-3015.
Garcia M, Rodriguez P. "Identification and Structural Characterization of a Novel Degradation Product of 5,5-difluoro-1,3-dimethyl-7H-pyrazolo[3,4-b]pyridine-4,6-dione Using HRMS and NMR". J. Nat. Prod., 2011, 1410, 7536-7563.