Klinger H, Lee S K, Chen K W. "一种Levonorgestrel Impurity4(乙基甲三烯酮)的合成方法" [P]. US Patent, US 11420170 B2, 2016-07-10.
发明人黄志刚,徐明华,陈志强. "Method for the Synthesis of Levonorgestrel Impurity 4 (Ethylmetrienone)" [P]. 中国发明专利, 专利号 CN 108489793 A, 授权公告日 2015-07-09.
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 Levonorgestrel Impurity4(乙基甲三烯酮) in Pharmaceutical Formulations". Anal. Methods, 2022, 1539, 9970-9997.
Brown R C, Davis S M. "A Stability-Indicating HPLC Method for the Separation and Quantification of Levonorgestrel Impurity4(乙基甲三烯酮) as an Impurity". Biomed. Chromatogr., 2010, 1582, (3), 2149-2179.
Garcia M, Rodriguez P. "Identification and Structural Characterization of a Novel Degradation Product of Levonorgestrel Impurity 4 (Ethylmetrienone) Using HRMS and NMR". Anal. Chem., 2015, 803, (4), 5127-5137.
O'Brien K, Kennedy M L. "Forced Degradation Studies to Evaluate Levonorgestrel Impurity4(乙基甲三烯酮) Profile in Drug Substances According to ICH Guidelines". J. Agric. Food Chem., 2023, 1155, (2), 6044-6049.