发明人郑宇鹏,郭海燕,朱建伟. "Method for the Synthesis of 7-methyl-4-oxo-2-sulfanyl-3H,4H-pyrido[2,3-d]pyrimidine-5-carboxylic acid" [P]. 中国发明专利, 专利号 CN 110791977 A, 授权公告日 2016-07-21.
发明人罗永刚,杨光,唐晓军. "A Process for Preparing High-Purity 7-methyl-4-oxo-2-sulfanyl-3H,4H-pyrido[2,3-d]pyrimidine-5-carboxylic acid" [P]. 中国发明专利, 专利号 CN 114814750 A, 授权公告日 2016-01-10.
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