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发明人孙丽萍,徐明华,赵玉洁. "Method for the Synthesis of 5-Methyl-2-((methylthio)methyl)-4-oxo-3,4-dihydrothieno[2,3-d]pyrimidine-6-carboxylic acid" [P]. 中国发明专利, 专利号 CN 112353103 A, 授权公告日 2022-12-21.
发明人黄志刚,郭海燕,韩伟. "A Process for Preparing High-Purity 5-Methyl-2-((methylthio)methyl)-4-oxo-3,4-dihydrothieno[2,3-d]pyrimidine-6-carboxylic acid" [P]. 中国发明专利, 专利号 CN 115452588 B, 授权公告日 2023-10-16.
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