发明人李文辉,沈红梅,郭海燕. "Method for the Synthesis of 2,4-Dichloropyrimido[4,5-d]pyridazin-5(6H)-one" [P]. 中国发明专利, 专利号 CN 112329773 B, 授权公告日 2020-01-16.
发明人孙丽萍,高志强,黄志刚. "A Process for Preparing High-Purity 2,4-Dichloropyrimido[4,5-d]pyridazin-5(6H)-one" [P]. 中国发明专利, 专利号 CN 112033598 A, 授权公告日 2018-06-16.
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