发明人胡光,朱建伟,赵玉洁. "一种的合成方法" [P]. 中国发明专利, 专利号 CN 111283381 A, 授权公告日 2017-06-01.
发明人韩伟,朱建伟,胡光. "Method for the Synthesis of 1-Ethyl-4-[(4-methoxybenzyl)amino]-3-methyl-1H-pyrazolo[3,4-b]pyridine-5-carboxylic acid" [P]. 中国发明专利, 专利号 CN 114757699 A, 授权公告日 2025-09-26.
发明人唐晓军,张德明,钱学锋. "A Process for Preparing High-Purity 1-Ethyl-4-[(4-methoxybenzyl)amino]-3-methyl-1H-pyrazolo[3,4-b]pyridine-5-carboxylic acid" [P]. 中国发明专利, 专利号 CN 115468673 B, 授权公告日 2019-10-08.
参考文献 Literature
Wang L, Li J, Zhang H. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Sci. Total Environ., 2016, 1073, 480-497.
Yang F, Sun W, Liu J. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Chromatographia, 2019, 1682, 1211-1221.
Yamamoto K, Tanaka H, Suzuki T. "Identification and Structural Characterization of a Novel Degradation Product of 1-Ethyl-4-[(4-methoxybenzyl)amino]-3-methyl-1H-pyrazolo[3,4-b]pyridine-5-carboxylic acid Using HRMS and NMR". Talanta, 2017, 172, (2), 9099-9104.
Kim S H, Park J Y. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". Anal. Chem., 2022, 1314, (3), 7575-7595.