发明人冯建国,沈红梅,马晓峰. "Method for the Synthesis of 2-Oxo-2H-pyrimido[1,2-b]pyridazine-4-carboxylic acid" [P]. 中国发明专利, 专利号 CN 116895993 B, 授权公告日 2021-03-16.
发明人周伟,冯建国,唐晓军. "A Process for Preparing High-Purity 2-Oxo-2H-pyrimido[1,2-b]pyridazine-4-carboxylic acid" [P]. 中国发明专利, 专利号 CN 114353884 A, 授权公告日 2018-02-11.
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