发明人马晓峰,赵玉洁,胡光. "一种利拉利汀杂质32的合成方法" [P]. 中国发明专利, 专利号 CN 108841097 A, 授权公告日 2024-06-01.
发明人张德明,杨光,黄志刚. "Method for the Synthesis of Linagliptin Impurity 32" [P]. 中国发明专利, 专利号 CN 116324509 A, 授权公告日 2016-04-27.
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