发明人杨光,孙丽萍,沈红梅. "一种己酮可可碱EP杂质K的合成方法" [P]. 中国发明专利, 专利号 CN 108333956 A, 授权公告日 2021-12-19.
Sørensen M, Mueller T C, Schröder R. "Method for the Synthesis of Pentoxifylline EP Impurity K" [P]. European Patent, EP 3931038 A1, 2019-06-08.
发明人唐晓军,韩伟,沈红梅. "A Process for Preparing High-Purity Pentoxifylline EP Impurity K" [P]. 中国发明专利, 专利号 CN 111200634 B, 授权公告日 2017-02-28.
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