发明人孙丽萍,郭海燕,王建平. "Method for the Synthesis of 1-(3,4-Difluorophenyl)-4-methoxy-6-oxo-1,6-dihydropyridazine-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 113204689 B, 授权公告日 2019-12-05.
发明人郑宇鹏,李文辉,陈志强. "A Process for Preparing High-Purity 1-(3,4-Difluorophenyl)-4-methoxy-6-oxo-1,6-dihydropyridazine-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 114114379 A, 授权公告日 2017-08-02.
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