发明人徐明华,王建平,胡光. "Method for the Synthesis of Tadalafil Impurity 49" [P]. 中国发明专利, 专利号 CN 111231201 A, 授权公告日 2019-03-28.
发明人冯建国,陈志强,赵玉洁. "A Process for Preparing High-Purity Tadalafil Impurity 49" [P]. 中国发明专利, 专利号 CN 116050049 A, 授权公告日 2022-10-19.
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