发明人钱学锋,王建平,冯建国. "一种N/A的合成方法" [P]. 中国发明专利, 专利号 CN 114966312 A, 授权公告日 2022-03-05.
发明人杨光,郑宇鹏,胡光. "Method for the Synthesis of 2-Amino-3-hydroxy-4-methylbenzoic acid" [P]. 中国发明专利, 专利号 CN 109428809 A, 授权公告日 2025-02-08.
发明人马晓峰,周伟,陈志强. "A Process for Preparing High-Purity 2-Amino-3-hydroxy-4-methylbenzoic acid" [P]. 中国发明专利, 专利号 CN 115336127 A, 授权公告日 2018-07-28.
参考文献 Literature
Hughes D, Roberts J, Thomas A. "Development and Validation of an LC-MS/MS Method for the Determination of N/A in Pharmaceutical Formulations". Sci. Total Environ., 2024, 645, 3951-3967.
Smith J A, Johnson M B. "A Stability-Indicating HPLC Method for the Separation and Quantification of N/A as an Impurity". Rapid Commun. Mass Spectrom., 2025, 1282, (8), 4201-4213.
Kim S H, Park J Y. "Identification and Structural Characterization of a Novel Degradation Product of 2-Amino-3-hydroxy-4-methylbenzoic acid Using HRMS and NMR". Environ. Sci. Technol., 2022, 444, 8894-8913.