发明人孙丽萍,朱建伟,钱学锋. "Method for the Synthesis of 1-ethyl-4-oxo-1,4-dihydrocinnoline-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 108127324 B, 授权公告日 2015-12-14.
发明人张德明,胡光,郑宇鹏. "A Process for Preparing High-Purity 1-ethyl-4-oxo-1,4-dihydrocinnoline-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 114321391 B, 授权公告日 2020-01-01.
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