发明人黄志刚,郭海燕,高志强. "Method for the Synthesis of Folic Acid Impurity N2" [P]. 中国发明专利, 专利号 CN 117526341 B, 授权公告日 2020-02-03.
发明人胡光,朱建伟,郑宇鹏. "A Process for Preparing High-Purity Folic Acid Impurity N2" [P]. 中国发明专利, 专利号 CN 109489687 B, 授权公告日 2021-09-21.
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