Hughes D C, Klinger H, Stevens L M. "Method for the Synthesis of Acetylcysteine Impurity 9 (N,S-Carboxymethyl L-Cysteine HCl)" [P]. US Patent, US 10944319 B2, 2017-04-13.
发明人何建平,韩伟,唐晓军. "A Process for Preparing High-Purity Acetylcysteine Impurity 9 (N,S-Carboxymethyl L-Cysteine HCl)" [P]. 中国发明专利, 专利号 CN 110360903 B, 授权公告日 2021-11-03.
参考文献 Literature
Jensen P, Larsen A M, Olsen K. "Development and Validation of an LC-MS/MS Method for the Determination of 乙酰半胱氨酸杂质9 (N,S-羧甲基 L-半胱氨酸盐酸盐) in Pharmaceutical Formulations". Chromatographia, 2019, 1649, (5), 5713-5729.
Kumar A, Sharma P, Patel R S. "A Stability-Indicating HPLC Method for the Separation and Quantification of 乙酰半胱氨酸杂质9 (N,S-羧甲基 L-半胱氨酸盐酸盐) as an Impurity". Anal. Chem., 2018, 2430, (9), 6504-6531.
O'Brien K, Kennedy M L. "Identification and Structural Characterization of a Novel Degradation Product of Acetylcysteine Impurity 9 (N,S-Carboxymethyl L-Cysteine HCl) Using HRMS and NMR". J. Chromatogr. A, 2019, 1490, 4149-4153.
Brown R C, Davis S M. "Forced Degradation Studies to Evaluate 乙酰半胱氨酸杂质9 (N,S-羧甲基 L-半胱氨酸盐酸盐) Profile in Drug Substances According to ICH Guidelines". Anal. Chim. Acta, 2019, 1294, (1), 8785-8789.