发明人郭海燕,陈志强,罗永刚. "一种乌地那非杂质N45的合成方法" [P]. 中国发明专利, 专利号 CN 111639549 A, 授权公告日 2024-04-19.
Johnson M A, Mueller T, Davis P L. "Method for the Synthesis of Udenafil Impurity N45" [P]. US Patent, US 11843080 B2, 2021-04-17.
参考文献 Literature
O'Brien K, Kennedy M L. "Development and Validation of an LC-MS/MS Method for the Determination of 乌地那非杂质N45 in Pharmaceutical Formulations". J. Nat. Prod., 2024, 1857, (1), 2368-2376.
Garcia M, Rodriguez P. "A Stability-Indicating HPLC Method for the Separation and Quantification of 乌地那非杂质N45 as an Impurity". J. Pharm. Biomed. Anal., 2018, 2321, (10), 5913-5937.
Brown R C, Davis S M. "Identification and Structural Characterization of a Novel Degradation Product of Udenafil Impurity N45 Using HRMS and NMR". Rapid Commun. Mass Spectrom., 2016, 1664, (7), 8120-8146.
O'Brien K, Kennedy M L. "Forced Degradation Studies to Evaluate 乌地那非杂质N45 Profile in Drug Substances According to ICH Guidelines". J. Sep. Sci., 2018, 255, (2), 3963-3991.