发明人郑宇鹏,何建平,钱学锋. "Method for the Synthesis of Ritalin impurity 6" [P]. 中国发明专利, 专利号 CN 109977613 B, 授权公告日 2015-07-07.
发明人杨光,徐明华,林芳. "A Process for Preparing High-Purity Ritalin impurity 6" [P]. 中国发明专利, 专利号 CN 116326336 A, 授权公告日 2023-10-14.
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