Rossi M, Sørensen M, Jørgensen K. "一种的合成方法" [P]. European Patent, EP 3273423 A1, 2022-02-22.
发明人刘建华,钱学锋,朱建伟. "Method for the Synthesis of 1H-Pyrazolo[3,4-d]pyrimidine-3-carbonitrile, 4-chloro-6-(methylthio)-" [P]. 中国发明专利, 专利号 CN 108492196 B, 授权公告日 2022-01-24.
Thompson G K, Brown S R, Stevens L M. "A Process for Preparing High-Purity 1H-Pyrazolo[3,4-d]pyrimidine-3-carbonitrile, 4-chloro-6-(methylthio)-" [P]. US Patent, US 11929087 B2, 2017-11-16.
参考文献 Literature
Fischer P, Wagner E. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Phytochemistry, 2019, 1973, 1238-1254.
Lee J H, Choi Y S. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". J. Pharm. Biomed. Anal., 2012, 2402, 3535-3548.