Björnsson E, Schröder R, Jørgensen K. "一种的合成方法" [P]. European Patent, EP 3930669 A1, 2016-02-01.
发明人何建平,郑宇鹏,黄志刚. "Method for the Synthesis of 3-Ethoxy-4-(pyridin-4-ylamino)cyclobut-3-ene-1,2-dione" [P]. 中国发明专利, 专利号 CN 117566434 A, 授权公告日 2016-06-27.
Mueller T, O'Brien P Q, Roberts E F. "A Process for Preparing High-Purity 3-Ethoxy-4-(pyridin-4-ylamino)cyclobut-3-ene-1,2-dione" [P]. US Patent, US 9291645 B2, 2018-10-22.
参考文献 Literature
Brown R C, Davis S M. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". J. Sep. Sci., 2014, 982, (10), 7747-7768.
Kim S H, Park J Y. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Biomed. Chromatogr., 2013, 1722, 2269-2283.
Jensen P, Larsen A M, Olsen K. "Identification and Structural Characterization of a Novel Degradation Product of 3-Ethoxy-4-(pyridin-4-ylamino)cyclobut-3-ene-1,2-dione Using HRMS and NMR". Anal. Chim. Acta, 2011, 2246, (12), 5689-5712.