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发明人徐明华,刘建华,朱建伟. "Method for the Synthesis of 4-Chloropyrimido[5,4-d]pyrimidine" [P]. 中国发明专利, 专利号 CN 115202682 B, 授权公告日 2021-12-18.
发明人王建平,唐晓军,赵玉洁. "A Process for Preparing High-Purity 4-Chloropyrimido[5,4-d]pyrimidine" [P]. 中国发明专利, 专利号 CN 114661210 A, 授权公告日 2017-04-12.
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