发明人李文辉,赵玉洁,张德明. "Method for the Synthesis of Carvedilol impurity 21" [P]. 中国发明专利, 专利号 CN 111817997 B, 授权公告日 2023-10-06.
发明人马晓峰,胡光,高志强. "A Process for Preparing High-Purity Carvedilol impurity 21" [P]. 中国发明专利, 专利号 CN 113100033 B, 授权公告日 2017-03-24.
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