发明人唐晓军,赵玉洁,郭海燕. "一种1H-吡唑并[3,4-d]嘧啶-4-羧酸的合成方法" [P]. 中国发明专利, 专利号 CN 110520856 A, 授权公告日 2016-04-18.
Williams B T, Yamamoto T, Thompson G K. "Method for the Synthesis of 1H-pyrazolo[3,4-d]pyrimidine-4-carboxylic acid" [P]. US Patent, US 10151328 B2, 2020-03-20.
参考文献 Literature
Brown R C, Davis S M. "Development and Validation of an LC-MS/MS Method for the Determination of 1H-吡唑并[3,4-d]嘧啶-4-羧酸 in Pharmaceutical Formulations". Talanta, 2015, 891, (9), 1998-2013.
Kowalski T, Nowak Z. "A Stability-Indicating HPLC Method for the Separation and Quantification of 1H-吡唑并[3,4-d]嘧啶-4-羧酸 as an Impurity". J. Agric. Food Chem., 2013, 1670, (7), 1495-1509.
Xu M, Hu Y, Zhou D. "Identification and Structural Characterization of a Novel Degradation Product of 1H-pyrazolo[3,4-d]pyrimidine-4-carboxylic acid Using HRMS and NMR". Biomed. Chromatogr., 2018, 2419, (4), 2191-2216.
O'Brien K, Kennedy M L. "Forced Degradation Studies to Evaluate 1H-吡唑并[3,4-d]嘧啶-4-羧酸 Profile in Drug Substances According to ICH Guidelines". J. Pharm. Biomed. Anal., 2017, 1129, 4675-4702.