发明人张德明,李文辉,徐明华. "Method for the Synthesis of Ambroxol Impurity 33 HCl" [P]. 中国发明专利, 专利号 CN 116715211 B, 授权公告日 2019-08-21.
发明人马晓峰,王建平,赵玉洁. "A Process for Preparing High-Purity Ambroxol Impurity 33 HCl" [P]. 中国发明专利, 专利号 CN 109651176 B, 授权公告日 2023-04-16.
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