发明人冯建国,林芳,郑宇鹏. "Method for the Synthesis of Pethidine Impurity N33" [P]. 中国发明专利, 专利号 CN 108115385 A, 授权公告日 2018-02-10.
Sørensen M, Jørgensen K, Schröder R. "A Process for Preparing High-Purity Pethidine Impurity N33" [P]. European Patent, EP 3090239 A1, 2018-09-05.
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