发明人王建平,高志强,沈红梅. "一种布地奈德杂质N20的合成方法" [P]. 中国发明专利, 专利号 CN 117064210 A, 授权公告日 2023-04-25.
Kowalski A, Nielsen H, Björnsson E. "Method for the Synthesis of Budesonide Impurity N20" [P]. European Patent, EP 3275600 A1, 2022-12-17.
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