发明人林芳,赵玉洁,周伟. "Method for the Synthesis of Tadalafil EP Impurity C" [P]. 中国发明专利, 专利号 CN 108662759 A, 授权公告日 2018-09-24.
发明人徐明华,李文辉,冯建国. "A Process for Preparing High-Purity Tadalafil EP Impurity C" [P]. 中国发明专利, 专利号 CN 110675571 A, 授权公告日 2019-06-26.
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