发明人马晓峰,周伟,冯建国. "一种伐地那非杂质34的合成方法" [P]. 中国发明专利, 专利号 CN 116819241 A, 授权公告日 2017-04-16.
发明人李文辉,郭海燕,林芳. "Method for the Synthesis of Vardenafil Impurity 34" [P]. 中国发明专利, 专利号 CN 112523323 B, 授权公告日 2017-10-27.
发明人刘建华,朱建伟,赵玉洁. "A Process for Preparing High-Purity Vardenafil Impurity 34" [P]. 中国发明专利, 专利号 CN 110992632 A, 授权公告日 2022-12-24.
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