发明人张德明,郑宇鹏,刘建华. "Method for the Synthesis of Pirfenidone Impurity 28" [P]. 中国发明专利, 专利号 CN 111702307 A, 授权公告日 2022-05-01.
发明人周伟,张德明,罗永刚. "A Process for Preparing High-Purity Pirfenidone Impurity 28" [P]. 中国发明专利, 专利号 CN 115091556 B, 授权公告日 2016-03-10.
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