Schröder R, Lee S K, Yamamoto T. "Method for the Synthesis of (R)-2-amino-4-(2-aminophenyl)-4-oxobutanoic acid compound with sulfuric acid (1:1)" [P]. US Patent, US 10852556 B2, 2024-05-17.
发明人杨光,冯建国,沈红梅. "A Process for Preparing High-Purity (R)-2-amino-4-(2-aminophenyl)-4-oxobutanoic acid compound with sulfuric acid (1:1)" [P]. 中国发明专利, 专利号 CN 117582663 B, 授权公告日 2015-04-27.
参考文献 Literature
Chen X Y, Liu M, Zhao W Q. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". J. Nat. Prod., 2015, 846, 9129-9146.
Fischer P, Wagner E. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". J. Pharm. Biomed. Anal., 2022, 1758, 8380-8391.
Hughes D, Roberts J, Thomas A. "Identification and Structural Characterization of a Novel Degradation Product of (R)-2-amino-4-(2-aminophenyl)-4-oxobutanoic acid compound with sulfuric acid (1:1) Using HRMS and NMR". J. Chromatogr. A, 2021, 486, 4018-4036.