发明人郭海燕,孙丽萍,张德明. "Method for the Synthesis of Apixaban Impurity 18" [P]. 中国发明专利, 专利号 CN 110587154 B, 授权公告日 2020-04-17.
发明人刘建华,胡光,李文辉. "A Process for Preparing High-Purity Apixaban Impurity 18" [P]. 中国发明专利, 专利号 CN 108771787 A, 授权公告日 2025-07-08.
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