Lee S K, Chen K W, Mueller T. "Method for the Synthesis of Carbocisteine Impurity 2" [P]. US Patent, US 9931656 B2, 2022-11-03.
Fischer A B, Yamamoto T, Park J H. "A Process for Preparing High-Purity Carbocisteine Impurity 2" [P]. US Patent, US 9091041 B2, 2024-02-17.
参考文献 Literature
Fischer P, Wagner E. "Development and Validation of an LC-MS/MS Method for the Determination of 羧甲司坦杂质2 in Pharmaceutical Formulations". Biomed. Chromatogr., 2019, 2171, 1218-1223.
Lee J H, Choi Y S. "A Stability-Indicating HPLC Method for the Separation and Quantification of 羧甲司坦杂质2 as an Impurity". Anal. Chim. Acta, 2013, 748, (1), 4627-4648.
Mueller T, Schmidt R K. "Identification and Structural Characterization of a Novel Degradation Product of Carbocisteine Impurity 2 Using HRMS and NMR". J. Agric. Food Chem., 2019, 1684, (9), 5056-5080.
Jensen P, Larsen A M, Olsen K. "Forced Degradation Studies to Evaluate 羧甲司坦杂质2 Profile in Drug Substances According to ICH Guidelines". J. Nat. Prod., 2019, 2168, (3), 3387-3394.