发明人李文辉,郑宇鹏,张德明. "Method for the Synthesis of 6-Ethoxy-2-oxo-2H-chromene-4-carboxylic acid" [P]. 中国发明专利, 专利号 CN 116077776 A, 授权公告日 2018-06-20.
发明人李文辉,郭海燕,何建平. "A Process for Preparing High-Purity 6-Ethoxy-2-oxo-2H-chromene-4-carboxylic acid" [P]. 中国发明专利, 专利号 CN 111604568 A, 授权公告日 2016-03-26.
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