发明人王建平,徐明华,何建平. "一种的合成方法" [P]. 中国发明专利, 专利号 CN 116373613 A, 授权公告日 2022-01-25.
Jørgensen K, Kowalski A, Sørensen M. "Method for the Synthesis of Ethyl 3-hydroxy-4-methyl-1H-indole-2-carboxylate" [P]. European Patent, EP 3199831 A1, 2015-12-04.
发明人何建平,马晓峰,冯建国. "A Process for Preparing High-Purity Ethyl 3-hydroxy-4-methyl-1H-indole-2-carboxylate" [P]. 中国发明专利, 专利号 CN 112721345 B, 授权公告日 2020-01-02.
参考文献 Literature
Mueller T, Schmidt R K. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Biomed. Chromatogr., 2016, 1103, 6643-6665.
Lee J H, Choi Y S. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". J. Agric. Food Chem., 2012, 900, 2939-2950.