发明人唐晓军,陈志强,钱学锋. "Method for the Synthesis of Ethyl 1-ethyl-2-imino-5-oxo-2,5-dihydro-1H-dipyrido[1,2-a:2',3'-d]pyrimidine-3-carboxylate" [P]. 中国发明专利, 专利号 CN 117075381 A, 授权公告日 2025-07-21.
发明人冯建国,何建平,李文辉. "A Process for Preparing High-Purity Ethyl 1-ethyl-2-imino-5-oxo-2,5-dihydro-1H-dipyrido[1,2-a:2',3'-d]pyrimidine-3-carboxylate" [P]. 中国发明专利, 专利号 CN 111560186 A, 授权公告日 2018-06-13.
参考文献 Literature
Lee J H, Choi Y S. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Sci. Total Environ., 2025, 999, 830-833.
Smith J A, Johnson M B. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". J. Pharm. Biomed. Anal., 2015, 641, (8), 1445-1474.
Yamamoto K, Tanaka H, Suzuki T. "Identification and Structural Characterization of a Novel Degradation Product of Ethyl 1-ethyl-2-imino-5-oxo-2,5-dihydro-1H-dipyrido[1,2-a:2',3'-d]pyrimidine-3-carboxylate Using HRMS and NMR". J. Chromatogr. A, 2018, 538, (12), 6648-6678.