Klinger H, Yamamoto T, Johnson M A. "一种西地那非杂质247的合成方法" [P]. US Patent, US 9707991 B2, 2016-04-19.
发明人王建平,赵玉洁,冯建国. "Method for the Synthesis of Sildenafil Impurity 247" [P]. 中国发明专利, 专利号 CN 113134339 A, 授权公告日 2025-04-24.
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