Williams B T, Hughes D C, Chen K W. "一种的合成方法" [P]. US Patent, US 10252691 B2, 2020-09-15.
Yamamoto T, Mueller T, Kumar R. "Method for the Synthesis of Ethyl 4-oxo-4,6-dihydropyrimido[1,2-b]indazole-3-carboxylate" [P]. US Patent, US 11793142 B2, 2020-01-22.
参考文献 Literature
Hughes D, Roberts J, Thomas A. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Molecules, 2015, 2220, 8943-8950.
O'Brien K, Kennedy M L. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Chromatographia, 2012, 2470, (4), 6477-6488.
Kowalski T, Nowak Z. "Identification and Structural Characterization of a Novel Degradation Product of Ethyl 4-oxo-4,6-dihydropyrimido[1,2-b]indazole-3-carboxylate Using HRMS and NMR". Sci. Total Environ., 2018, 2422, 7671-7692.
Hughes D, Roberts J, Thomas A. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". Phytochemistry, 2011, 953, 6541-6562.