Yamamoto T, Lee S K, Park J H. "一种的合成方法" [P]. US Patent, US 9517797 B2, 2025-08-10.
发明人马晓峰,钱学锋,冯建国. "Method for the Synthesis of 3-[4-(difluoromethyl)-2-ethyl-3-methyl-6-oxo-2h,6h,7h-pyrazolo[3,4-b]pyridin-7-yl]propanoic acid" [P]. 中国发明专利, 专利号 CN 117756919 A, 授权公告日 2021-03-17.
发明人周伟,沈红梅,唐晓军. "A Process for Preparing High-Purity 3-[4-(difluoromethyl)-2-ethyl-3-methyl-6-oxo-2h,6h,7h-pyrazolo[3,4-b]pyridin-7-yl]propanoic acid" [P]. 中国发明专利, 专利号 CN 113152656 A, 授权公告日 2023-01-18.
参考文献 Literature
Mueller T, Schmidt R K. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Anal. Chim. Acta, 2016, 1889, (9), 2792-2809.
Yang F, Sun W, Liu J. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Phytochemistry, 2016, 1395, (7), 7347-7367.
Kim S H, Park J Y. "Identification and Structural Characterization of a Novel Degradation Product of 3-[4-(difluoromethyl)-2-ethyl-3-methyl-6-oxo-2h,6h,7h-pyrazolo[3,4-b]pyridin-7-yl]propanoic acid Using HRMS and NMR". J. Agric. Food Chem., 2010, 2040, (2), 3257-3283.