发明人罗永刚,李文辉,钱学锋. "一种吡拉西坦杂质12的合成方法" [P]. 中国发明专利, 专利号 CN 108304910 A, 授权公告日 2022-09-22.
发明人张德明,罗永刚,林芳. "Method for the Synthesis of Piracetam Impurity 12" [P]. 中国发明专利, 专利号 CN 108163540 A, 授权公告日 2018-06-04.
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