发明人钱学锋,徐明华,孙丽萍. "一种左甲状腺素杂质20的合成方法" [P]. 中国发明专利, 专利号 CN 112570659 A, 授权公告日 2024-07-18.
发明人张德明,高志强,刘建华. "Method for the Synthesis of Levothyroxine Impurity 20" [P]. 中国发明专利, 专利号 CN 117482442 A, 授权公告日 2023-12-20.
发明人高志强,陈志强,黄志刚. "A Process for Preparing High-Purity Levothyroxine Impurity 20" [P]. 中国发明专利, 专利号 CN 117575339 B, 授权公告日 2023-12-09.
参考文献 Literature
Fischer P, Wagner E. "Development and Validation of an LC-MS/MS Method for the Determination of 左甲状腺素杂质20 in Pharmaceutical Formulations". J. Pharm. Biomed. Anal., 2011, 1106, 5567-5572.
Lee J H, Choi Y S. "A Stability-Indicating HPLC Method for the Separation and Quantification of 左甲状腺素杂质20 as an Impurity". J. Chromatogr. A, 2012, 2294, (8), 9522-9542.
Kumar A, Sharma P, Patel R S. "Identification and Structural Characterization of a Novel Degradation Product of Levothyroxine Impurity 20 Using HRMS and NMR". J. Sep. Sci., 2021, 2364, (8), 3837-3859.