发明人郭海燕,林芳,刘建华. "Method for the Synthesis of Otilonium Bromide Impurity 4" [P]. 中国发明专利, 专利号 CN 109107797 B, 授权公告日 2021-02-16.
发明人刘建华,马晓峰,韩伟. "A Process for Preparing High-Purity Otilonium Bromide Impurity 4" [P]. 中国发明专利, 专利号 CN 109544767 B, 授权公告日 2017-05-23.
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