发明人何建平,马晓峰,唐晓军. "Method for the Synthesis of Ethyl 4-(cyclopropylamino)-1-ethyl-3-methyl-1H-pyrazolo[3,4-b]pyridine-5-carboxylate" [P]. 中国发明专利, 专利号 CN 108291658 A, 授权公告日 2025-12-14.
参考文献 Literature
Martinez C, Lopez D R. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Environ. Sci. Technol., 2024, 466, (12), 4580-4586.
Hughes D, Roberts J, Thomas A. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Chemosphere, 2016, 2250, (4), 5220-5237.
Yang F, Sun W, Liu J. "Identification and Structural Characterization of a Novel Degradation Product of Ethyl 4-(cyclopropylamino)-1-ethyl-3-methyl-1H-pyrazolo[3,4-b]pyridine-5-carboxylate Using HRMS and NMR". J. Pharm. Biomed. Anal., 2015, 2416, 9347-9371.
Brown R C, Davis S M. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". J. Sep. Sci., 2013, 1221, 4648-4653.