发明人钱学锋,赵玉洁,罗永刚. "一种的合成方法" [P]. 中国发明专利, 专利号 CN 114220404 A, 授权公告日 2022-06-17.
发明人冯建国,马晓峰,唐晓军. "Method for the Synthesis of 3-Nitro-4-oxo-4,5,6,7-tetrahydro-pyrazolo-[1,5-a]pyrazine-2-carboxylic acid methyl ester" [P]. 中国发明专利, 专利号 CN 112042953 B, 授权公告日 2018-05-22.
发明人徐明华,冯建国,刘建华. "A Process for Preparing High-Purity 3-Nitro-4-oxo-4,5,6,7-tetrahydro-pyrazolo-[1,5-a]pyrazine-2-carboxylic acid methyl ester" [P]. 中国发明专利, 专利号 CN 110450067 B, 授权公告日 2016-04-18.
参考文献 Literature
Martinez C, Lopez D R. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". J. Nat. Prod., 2010, 1338, 9815-9837.
Wang L, Li J, Zhang H. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". J. Pharm. Biomed. Anal., 2019, 2177, (12), 2263-2286.
Mueller T, Schmidt R K. "Identification and Structural Characterization of a Novel Degradation Product of 3-Nitro-4-oxo-4,5,6,7-tetrahydro-pyrazolo-[1,5-a]pyrazine-2-carboxylic acid methyl ester Using HRMS and NMR". Molecules, 2019, 269, (12), 8490-8518.
Wang L, Li J, Zhang H. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". Chemosphere, 2024, 1797, 6702-6713.