Lefèvre J P, Nowak P, Kowalski A. "一种吡嘧司特杂质4的合成方法" [P]. European Patent, EP 3442251 A1, 2019-10-14.
Lefèvre J P, Nowak P, Schröder R. "Method for the Synthesis of Pemirolast Impurity 4" [P]. European Patent, EP 3323100 A1, 2025-04-25.
发明人陈志强,孙丽萍,高志强. "A Process for Preparing High-Purity Pemirolast Impurity 4" [P]. 中国发明专利, 专利号 CN 113068809 A, 授权公告日 2022-11-07.
参考文献 Literature
Xu M, Hu Y, Zhou D. "Development and Validation of an LC-MS/MS Method for the Determination of 吡嘧司特杂质4 in Pharmaceutical Formulations". J. Nat. Prod., 2013, 2380, 2028-2035.
Lee J H, Choi Y S. "A Stability-Indicating HPLC Method for the Separation and Quantification of 吡嘧司特杂质4 as an Impurity". Phytochemistry, 2023, 444, (2), 4430-4442.
Mueller T, Schmidt R K. "Identification and Structural Characterization of a Novel Degradation Product of Pemirolast Impurity 4 Using HRMS and NMR". Biomed. Chromatogr., 2015, 671, (11), 5478-5489.
Fischer P, Wagner E. "Forced Degradation Studies to Evaluate 吡嘧司特杂质4 Profile in Drug Substances According to ICH Guidelines". Anal. Methods, 2016, 1048, (5), 9548-9565.