Anderson J P, O'Brien P Q, Williams B T. "一种雌二醇杂质21的合成方法" [P]. US Patent, US 10689933 B2, 2024-01-17.
Hughes D C, O'Brien P Q, Brown S R. "Method for the Synthesis of Estradiol Impurity 21" [P]. US Patent, US 10016593 B2, 2023-10-09.
发明人钱学锋,杨光,刘建华. "A Process for Preparing High-Purity Estradiol Impurity 21" [P]. 中国发明专利, 专利号 CN 113959850 B, 授权公告日 2020-06-24.
参考文献 Literature
Zhang Y, Li Q, Chen T. "Development and Validation of an LC-MS/MS Method for the Determination of 雌二醇杂质21 in Pharmaceutical Formulations". Phytochemistry, 2021, 2370, (2), 2798-2801.
Kumar A, Sharma P, Patel R S. "A Stability-Indicating HPLC Method for the Separation and Quantification of 雌二醇杂质21 as an Impurity". Environ. Sci. Technol., 2011, 2282, (5), 8340-8348.
Zhou X P, Huang L, Wu G. "Identification and Structural Characterization of a Novel Degradation Product of Estradiol Impurity 21 Using HRMS and NMR". Anal. Chim. Acta, 2021, 1901, (12), 6030-6041.