发明人徐明华,高志强,杨光. "Method for the Synthesis of Sildenafil Impurity 55" [P]. 中国发明专利, 专利号 CN 111023639 B, 授权公告日 2021-10-10.
发明人张德明,韩伟,郭海燕. "A Process for Preparing High-Purity Sildenafil Impurity 55" [P]. 中国发明专利, 专利号 CN 109965625 A, 授权公告日 2017-12-21.
参考文献 Literature
Fischer P, Wagner E. "Development and Validation of an LC-MS/MS Method for the Determination of 西地那非杂质55 in Pharmaceutical Formulations". J. Chromatogr. A, 2021, 2095, 1066-1071.
Xu M, Hu Y, Zhou D. "A Stability-Indicating HPLC Method for the Separation and Quantification of 西地那非杂质55 as an Impurity". J. Sep. Sci., 2015, 143, 8418-8428.
Zhou X P, Huang L, Wu G. "Identification and Structural Characterization of a Novel Degradation Product of Sildenafil Impurity 55 Using HRMS and NMR". Molecules, 2010, 2210, 8254-8273.