Martínez F, Johansson L, Schröder R. "Method for the Synthesis of Ethyl 2-(1-(tert-butyl)-4-methyl-7-oxo-1,7-dihydro-6H-pyrazolo[3,4-d]pyridazin-6-yl)acetate" [P]. European Patent, EP 3754328 A1, 2021-06-23.
发明人沈红梅,杨光,孙丽萍. "A Process for Preparing High-Purity Ethyl 2-(1-(tert-butyl)-4-methyl-7-oxo-1,7-dihydro-6H-pyrazolo[3,4-d]pyridazin-6-yl)acetate" [P]. 中国发明专利, 专利号 CN 112891435 A, 授权公告日 2025-09-18.
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". Chemosphere, 2015, 1015, (5), 4774-4788.
Hughes D, Roberts J, Thomas A. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Molecules, 2023, 2021, (12), 7309-7315.
Kim S H, Park J Y. "Identification and Structural Characterization of a Novel Degradation Product of Ethyl 2-(1-(tert-butyl)-4-methyl-7-oxo-1,7-dihydro-6H-pyrazolo[3,4-d]pyridazin-6-yl)acetate Using HRMS and NMR". Environ. Sci. Technol., 2024, 1637, (6), 6281-6309.
Zhang Y, Li Q, Chen T. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". Food Chem., 2013, 2207, 4003-4007.