发明人徐明华,林芳,冯建国. "Method for the Synthesis of Sildenafil Impurity 38" [P]. 中国发明专利, 专利号 CN 117675065 B, 授权公告日 2020-09-07.
发明人杨光,冯建国,周伟. "A Process for Preparing High-Purity Sildenafil Impurity 38" [P]. 中国发明专利, 专利号 CN 111338846 A, 授权公告日 2022-11-11.
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