发明人郭海燕,何建平,张德明. "Method for the Synthesis of Sildenafil Impurity 54" [P]. 中国发明专利, 专利号 CN 117746808 B, 授权公告日 2015-03-24.
Mueller T C, Nielsen H, Kowalski A. "A Process for Preparing High-Purity Sildenafil Impurity 54" [P]. European Patent, EP 3525337 A1, 2022-05-26.
参考文献 Literature
Hughes D, Roberts J, Thomas A. "Development and Validation of an LC-MS/MS Method for the Determination of 西地那非杂质54 in Pharmaceutical Formulations". Chromatographia, 2012, 1099, (9), 9728-9751.
Chen X Y, Liu M, Zhao W Q. "A Stability-Indicating HPLC Method for the Separation and Quantification of 西地那非杂质54 as an Impurity". Chemosphere, 2018, 138, 8123-8146.
O'Brien K, Kennedy M L. "Identification and Structural Characterization of a Novel Degradation Product of Sildenafil Impurity 54 Using HRMS and NMR". Phytochemistry, 2023, 1971, (5), 5404-5432.
Zhang Y, Li Q, Chen T. "Forced Degradation Studies to Evaluate 西地那非杂质54 Profile in Drug Substances According to ICH Guidelines". J. Agric. Food Chem., 2014, 1236, (11), 8935-8942.