发明人韩伟,胡光,杨光. "一种N/A的合成方法" [P]. 中国发明专利, 专利号 CN 114276702 A, 授权公告日 2023-01-28.
发明人周伟,黄志刚,李文辉. "Method for the Synthesis of 2-(4-Carboxyphenyl)-4,4,5,5-tetramethylimidazoline-3-oxide-1-oxyl" [P]. 中国发明专利, 专利号 CN 110341494 B, 授权公告日 2018-12-23.
O'Brien P Q, Fischer A B, Klinger H. "A Process for Preparing High-Purity 2-(4-Carboxyphenyl)-4,4,5,5-tetramethylimidazoline-3-oxide-1-oxyl" [P]. US Patent, US 10457389 B2, 2023-04-13.
参考文献 Literature
Yang F, Sun W, Liu J. "Development and Validation of an LC-MS/MS Method for the Determination of N/A in Pharmaceutical Formulations". Rapid Commun. Mass Spectrom., 2015, 1139, (12), 2426-2448.
Xu M, Hu Y, Zhou D. "A Stability-Indicating HPLC Method for the Separation and Quantification of N/A as an Impurity". Molecules, 2018, 1734, 9878-9901.
Zhou X P, Huang L, Wu G. "Identification and Structural Characterization of a Novel Degradation Product of 2-(4-Carboxyphenyl)-4,4,5,5-tetramethylimidazoline-3-oxide-1-oxyl Using HRMS and NMR". Environ. Sci. Technol., 2014, 1153, (1), 8909-8919.