Kumar R, Yamamoto T, Brown S R. "Method for the Synthesis of Levonorgestrel EP Impurity T" [P]. US Patent, US 10680915 B2, 2017-11-09.
发明人沈红梅,赵玉洁,高志强. "A Process for Preparing High-Purity Levonorgestrel EP Impurity T" [P]. 中国发明专利, 专利号 CN 108880445 B, 授权公告日 2019-05-26.
参考文献 Literature
Martinez C, Lopez D R. "Development and Validation of an LC-MS/MS Method for the Determination of 左炔诺孕酮EP杂质T in Pharmaceutical Formulations". Anal. Methods, 2015, 954, 8882-8887.
Smith J A, Johnson M B. "A Stability-Indicating HPLC Method for the Separation and Quantification of 左炔诺孕酮EP杂质T as an Impurity". J. Pharm. Biomed. Anal., 2024, 2230, 1261-1270.
Kowalski T, Nowak Z. "Identification and Structural Characterization of a Novel Degradation Product of Levonorgestrel EP Impurity T Using HRMS and NMR". Rapid Commun. Mass Spectrom., 2012, 1296, (12), 8180-8206.