Fischer A B, Klinger H, Stevens L M. "Method for the Synthesis of 3-(2-Methyl-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-3-yl)propanoic acid" [P]. US Patent, US 10919811 B2, 2023-03-08.
Klinger H, Mueller T, Hughes D C. "A Process for Preparing High-Purity 3-(2-Methyl-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-3-yl)propanoic acid" [P]. US Patent, US 9485418 B2, 2023-04-19.
参考文献 Literature
Yang F, Sun W, Liu J. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". J. Nat. Prod., 2023, 2214, (1), 5155-5160.
Jensen P, Larsen A M, Olsen K. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". J. Agric. Food Chem., 2023, 431, 1295-1305.
Yang F, Sun W, Liu J. "Identification and Structural Characterization of a Novel Degradation Product of 3-(2-Methyl-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-3-yl)propanoic acid Using HRMS and NMR". Chemosphere, 2023, 1984, 8736-8754.
Chen X Y, Liu M, Zhao W Q. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". J. Chromatogr. A, 2010, 154, 418-422.