Hughes D C, Park J H, Thompson G K. "一种西地那非杂质254的合成方法" [P]. US Patent, US 11826675 B2, 2015-11-18.
发明人李文辉,唐晓军,孙丽萍. "Method for the Synthesis of Sildenafil Impurity 254" [P]. 中国发明专利, 专利号 CN 115802102 A, 授权公告日 2018-08-24.
发明人陈志强,李文辉,郑宇鹏. "A Process for Preparing High-Purity Sildenafil Impurity 254" [P]. 中国发明专利, 专利号 CN 113514117 A, 授权公告日 2018-10-02.
参考文献 Literature
Smith J A, Johnson M B. "Development and Validation of an LC-MS/MS Method for the Determination of 西地那非杂质254 in Pharmaceutical Formulations". J. Pharm. Biomed. Anal., 2015, 930, (2), 605-613.
Yamamoto K, Tanaka H, Suzuki T. "A Stability-Indicating HPLC Method for the Separation and Quantification of 西地那非杂质254 as an Impurity". Sci. Total Environ., 2018, 1447, 8419-8443.
O'Brien K, Kennedy M L. "Identification and Structural Characterization of a Novel Degradation Product of Sildenafil Impurity 254 Using HRMS and NMR". J. Chromatogr. A, 2011, 665, 266-274.