Klinger H, Stevens L M, Hughes D C. "一种左炔诺孕酮杂质35的合成方法" [P]. US Patent, US 11310678 B2, 2015-11-02.
发明人何建平,韩伟,唐晓军. "Method for the Synthesis of Levonorgestrel Impurity 35" [P]. 中国发明专利, 专利号 CN 109852878 B, 授权公告日 2023-06-03.
Brown S R, Mueller T, Kumar R. "A Process for Preparing High-Purity Levonorgestrel Impurity 35" [P]. US Patent, US 11164259 B2, 2019-12-23.
参考文献 Literature
Fischer P, Wagner E. "Development and Validation of an LC-MS/MS Method for the Determination of 左炔诺孕酮杂质35 in Pharmaceutical Formulations". Anal. Methods, 2020, 1690, 9774-9795.
Hughes D, Roberts J, Thomas A. "A Stability-Indicating HPLC Method for the Separation and Quantification of 左炔诺孕酮杂质35 as an Impurity". Anal. Chem., 2014, 1768, (2), 8250-8256.
Kowalski T, Nowak Z. "Identification and Structural Characterization of a Novel Degradation Product of Levonorgestrel Impurity 35 Using HRMS and NMR". Rapid Commun. Mass Spectrom., 2023, 979, (3), 4013-4033.
Fischer P, Wagner E. "Forced Degradation Studies to Evaluate 左炔诺孕酮杂质35 Profile in Drug Substances According to ICH Guidelines". Talanta, 2025, 1033, (2), 9851-9874.