发明人张德明,郑宇鹏,李文辉. "Method for the Synthesis of Ethyl 2-amino-5-carbamoyl-4-methylthiophene-3-carboxylate" [P]. 中国发明专利, 专利号 CN 112641698 A, 授权公告日 2022-02-20.
发明人刘建华,高志强,罗永刚. "A Process for Preparing High-Purity Ethyl 2-amino-5-carbamoyl-4-methylthiophene-3-carboxylate" [P]. 中国发明专利, 专利号 CN 117633090 B, 授权公告日 2022-09-17.
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 in Pharmaceutical Formulations". Molecules, 2014, 142, 5647-5657.
Martinez C, Lopez D R. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Environ. Sci. Technol., 2013, 267, 5538-5554.
Jensen P, Larsen A M, Olsen K. "Identification and Structural Characterization of a Novel Degradation Product of Ethyl 2-amino-5-carbamoyl-4-methylthiophene-3-carboxylate Using HRMS and NMR". J. Sep. Sci., 2012, 653, (2), 5646-5664.
Zhang Y, Li Q, Chen T. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". Rapid Commun. Mass Spectrom., 2023, 696, 8006-8016.