Nowak P, Sørensen M, Lefèvre J P. "Method for the Synthesis of 5-Methyl-5H-pyrazolo[3,4-d]pyrimidin-4-amine" [P]. European Patent, EP 3392564 A1, 2017-08-22.
Williams B T, Brown S R, Anderson J P. "A Process for Preparing High-Purity 5-Methyl-5H-pyrazolo[3,4-d]pyrimidin-4-amine" [P]. US Patent, US 9566784 B2, 2017-07-05.
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". Talanta, 2018, 1930, (1), 887-907.
Zhou X P, Huang L, Wu G. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Biomed. Chromatogr., 2020, 547, (2), 8180-8196.
Kim S H, Park J Y. "Identification and Structural Characterization of a Novel Degradation Product of 5-Methyl-5H-pyrazolo[3,4-d]pyrimidin-4-amine Using HRMS and NMR". Environ. Sci. Technol., 2020, 2394, (11), 1800-1826.
Zhang Y, Li Q, Chen T. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". Anal. Chem., 2018, 165, (12), 5264-5290.