发明人郭海燕,张德明,陈志强. "Method for the Synthesis of Ethyl 5,6-difluoro-1H-indazole-3-carboxylate" [P]. 中国发明专利, 专利号 CN 115201502 A, 授权公告日 2021-08-15.
发明人周伟,林芳,胡光. "A Process for Preparing High-Purity Ethyl 5,6-difluoro-1H-indazole-3-carboxylate" [P]. 中国发明专利, 专利号 CN 113474116 A, 授权公告日 2025-11-13.
参考文献 Literature
Zhang Y, Li Q, Chen T. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Biomed. Chromatogr., 2019, 2341, 4964-4991.
Hughes D, Roberts J, Thomas A. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Chromatographia, 2020, 773, 941-946.
Fischer P, Wagner E. "Identification and Structural Characterization of a Novel Degradation Product of Ethyl 5,6-difluoro-1H-indazole-3-carboxylate Using HRMS and NMR". Anal. Methods, 2025, 1759, 2735-2744.
Kim S H, Park J Y. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". Phytochemistry, 2011, 1413, 2516-2533.