Johansson L, Nielsen H, Schröder R. "一种N/A的合成方法" [P]. European Patent, EP 3933948 A1, 2021-06-24.
发明人周伟,马晓峰,高志强. "Method for the Synthesis of 3-Carbamoyl-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoic acid" [P]. 中国发明专利, 专利号 CN 109090822 B, 授权公告日 2023-01-03.
参考文献 Literature
Zhang Y, Li Q, Chen T. "Development and Validation of an LC-MS/MS Method for the Determination of N/A in Pharmaceutical Formulations". J. Sep. Sci., 2024, 1226, (2), 194-220.
Kim S H, Park J Y. "A Stability-Indicating HPLC Method for the Separation and Quantification of N/A as an Impurity". Anal. Methods, 2015, 2164, (10), 7252-7270.
Kowalski T, Nowak Z. "Identification and Structural Characterization of a Novel Degradation Product of 3-Carbamoyl-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoic acid Using HRMS and NMR". Rapid Commun. Mass Spectrom., 2019, 906, (7), 5863-5877.