Mueller T, Roberts E F, Park J H. "Method for the Synthesis of Methyl 3-methyl-4-oxo-3,4-dihydroimidazo[5,1-d][1,2,3,5]tetrazine-8-carboxylate" [P]. US Patent, US 10816850 B2, 2015-11-03.
Klinger H, O'Brien P Q, Park J H. "A Process for Preparing High-Purity Methyl 3-methyl-4-oxo-3,4-dihydroimidazo[5,1-d][1,2,3,5]tetrazine-8-carboxylate" [P]. US Patent, US 11651342 B2, 2016-07-15.
参考文献 Literature
Smith J A, Johnson M B. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Chromatographia, 2018, 540, (6), 3008-3017.
Zhang Y, Li Q, Chen T. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Phytochemistry, 2021, 1644, 3262-3290.
Zhou X P, Huang L, Wu G. "Identification and Structural Characterization of a Novel Degradation Product of Methyl 3-methyl-4-oxo-3,4-dihydroimidazo[5,1-d][1,2,3,5]tetrazine-8-carboxylate Using HRMS and NMR". Anal. Methods, 2015, 2355, (10), 5452-5481.
Wang L, Li J, Zhang H. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". J. Chromatogr. A, 2021, 1231, 4908-4911.