发明人赵玉洁,王建平,郭海燕. "Method for the Synthesis of Metformin Impurity 12" [P]. 中国发明专利, 专利号 CN 116830934 A, 授权公告日 2019-09-25.
发明人胡光,郭海燕,钱学锋. "A Process for Preparing High-Purity Metformin Impurity 12" [P]. 中国发明专利, 专利号 CN 114940363 A, 授权公告日 2024-03-19.
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