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发明人黄志刚,郑宇鹏,钱学锋. "Method for the Synthesis of Piracetam Impurity 20" [P]. 中国发明专利, 专利号 CN 111222629 A, 授权公告日 2017-02-10.
Schröder R, Chen K W, Roberts E F. "A Process for Preparing High-Purity Piracetam Impurity 20" [P]. US Patent, US 11629322 B2, 2025-01-25.
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