发明人李文辉,郭海燕,何建平. "一种N/A的合成方法" [P]. 中国发明专利, 专利号 CN 116995814 A, 授权公告日 2024-03-27.
Davis P L, Hughes D C, Kumar R. "Method for the Synthesis of 4-Hydroxy-2-methylthieno[2,3-d]pyrimidine-5-carboxylic acid" [P]. US Patent, US 10681766 B2, 2023-11-25.
发明人郭海燕,高志强,王建平. "A Process for Preparing High-Purity 4-Hydroxy-2-methylthieno[2,3-d]pyrimidine-5-carboxylic acid" [P]. 中国发明专利, 专利号 CN 112530401 B, 授权公告日 2024-12-03.
参考文献 Literature
Kim S H, Park J Y. "Development and Validation of an LC-MS/MS Method for the Determination of N/A in Pharmaceutical Formulations". J. Pharm. Biomed. Anal., 2011, 962, (11), 1407-1425.
Xu M, Hu Y, Zhou D. "A Stability-Indicating HPLC Method for the Separation and Quantification of N/A as an Impurity". J. Nat. Prod., 2014, 2147, 4334-4362.
Yamamoto K, Tanaka H, Suzuki T. "Identification and Structural Characterization of a Novel Degradation Product of 4-Hydroxy-2-methylthieno[2,3-d]pyrimidine-5-carboxylic acid Using HRMS and NMR". Food Chem., 2019, 1044, 6904-6922.