发明人马晓峰,杨光,罗永刚. "Method for the Synthesis of <I>N</I>-[3-Cyano-3-[4-(dicyanomethyl)phenyl]-2-propenylidene]-<I>N</I>-ethyl-ethaniminium inner salt" [P]. 中国发明专利, 专利号 CN 116589528 A, 授权公告日 2021-04-04.
发明人张德明,黄志刚,郑宇鹏. "A Process for Preparing High-Purity <I>N</I>-[3-Cyano-3-[4-(dicyanomethyl)phenyl]-2-propenylidene]-<I>N</I>-ethyl-ethaniminium inner salt" [P]. 中国发明专利, 专利号 CN 114622259 B, 授权公告日 2023-07-05.
参考文献 Literature
Kumar A, Sharma P, Patel R S. "Development and Validation of an LC-MS/MS Method for the Determination of <I>N</I>-[3-Cyano-3-[4-(dicyanomethyl)phenyl]-2-propenylidene]-<I>N</I>-ethyl-ethaniminium inner salt in Pharmaceutical Formulations". Phytochemistry, 2024, 1287, 8334-8348.
Kumar A, Sharma P, Patel R S. "A Stability-Indicating HPLC Method for the Separation and Quantification of <I>N</I>-[3-Cyano-3-[4-(dicyanomethyl)phenyl]-2-propenylidene]-<I>N</I>-ethyl-ethaniminium inner salt as an Impurity". Environ. Sci. Technol., 2023, 1553, (9), 1817-1823.
Lee J H, Choi Y S. "Identification and Structural Characterization of a Novel Degradation Product of <I>N</I>-[3-Cyano-3-[4-(dicyanomethyl)phenyl]-2-propenylidene]-<I>N</I>-ethyl-ethaniminium inner salt Using HRMS and NMR". Anal. Chim. Acta, 2025, 1240, (6), 2069-2084.
Zhou X P, Huang L, Wu G. "Forced Degradation Studies to Evaluate <I>N</I>-[3-Cyano-3-[4-(dicyanomethyl)phenyl]-2-propenylidene]-<I>N</I>-ethyl-ethaniminium inner salt Profile in Drug Substances According to ICH Guidelines". J. Sep. Sci., 2022, 184, (8), 4892-4916.