发明人黄志刚,马晓峰,高志强. "Method for the Synthesis of Piperazine, 1-ethyl-4-(3-methoxy-4-nitrophenyl)-" [P]. 中国发明专利, 专利号 CN 115826712 A, 授权公告日 2020-03-06.
发明人冯建国,唐晓军,刘建华. "A Process for Preparing High-Purity Piperazine, 1-ethyl-4-(3-methoxy-4-nitrophenyl)-" [P]. 中国发明专利, 专利号 CN 117641694 B, 授权公告日 2018-04-11.
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