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发明人钱学锋,杨光,郑宇鹏. "Method for the Synthesis of Methotrexate EP Impurity C" [P]. 中国发明专利, 专利号 CN 108664586 B, 授权公告日 2016-11-11.
发明人高志强,马晓峰,郭海燕. "A Process for Preparing High-Purity Methotrexate EP Impurity C" [P]. 中国发明专利, 专利号 CN 108025745 A, 授权公告日 2024-07-07.
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