Johansson L, Björnsson E, Nowak P. "一种N/A的合成方法" [P]. European Patent, EP 3483266 A1, 2015-04-15.
发明人周伟,韩伟,何建平. "Method for the Synthesis of 6-Chloro-2,4-dimethyl-2H-pyrazolo[3,4-b]pyridine" [P]. 中国发明专利, 专利号 CN 114629900 A, 授权公告日 2023-10-15.
参考文献 Literature
Zhang Y, Li Q, Chen T. "Development and Validation of an LC-MS/MS Method for the Determination of N/A in Pharmaceutical Formulations". Biomed. Chromatogr., 2024, 289, (2), 4587-4599.
Yamamoto K, Tanaka H, Suzuki T. "A Stability-Indicating HPLC Method for the Separation and Quantification of N/A as an Impurity". J. Agric. Food Chem., 2017, 2447, (8), 7623-7639.
Martinez C, Lopez D R. "Identification and Structural Characterization of a Novel Degradation Product of 6-Chloro-2,4-dimethyl-2H-pyrazolo[3,4-b]pyridine Using HRMS and NMR". Environ. Sci. Technol., 2020, 1645, 5889-5916.
Xu M, Hu Y, Zhou D. "Forced Degradation Studies to Evaluate N/A Profile in Drug Substances According to ICH Guidelines". Anal. Chem., 2020, 1927, (11), 3685-3698.