Davis P L, Williams B T, Kumar R. "一种倍他米松杂质21的合成方法" [P]. US Patent, US 10233133 B2, 2016-02-12.
发明人罗永刚,朱建伟,郭海燕. "Method for the Synthesis of Betamethasone Impurity 21" [P]. 中国发明专利, 专利号 CN 112014253 A, 授权公告日 2016-03-04.
发明人朱建伟,赵玉洁,何建平. "A Process for Preparing High-Purity Betamethasone Impurity 21" [P]. 中国发明专利, 专利号 CN 114116138 A, 授权公告日 2021-11-13.
参考文献 Literature
Brown R C, Davis S M. "Development and Validation of an LC-MS/MS Method for the Determination of 倍他米松杂质21 in Pharmaceutical Formulations". J. Nat. Prod., 2021, 676, (12), 2095-2119.
Kumar A, Sharma P, Patel R S. "A Stability-Indicating HPLC Method for the Separation and Quantification of 倍他米松杂质21 as an Impurity". Talanta, 2015, 701, (5), 6730-6738.
Fischer P, Wagner E. "Identification and Structural Characterization of a Novel Degradation Product of Betamethasone Impurity 21 Using HRMS and NMR". Anal. Chem., 2017, 1527, (3), 6488-6497.