发明人唐晓军,黄志刚,王建平. "一种氧嗪酸杂质4的合成方法" [P]. 中国发明专利, 专利号 CN 116714801 A, 授权公告日 2018-09-22.
发明人张德明,王建平,沈红梅. "Method for the Synthesis of Oxonic Acid Impurity 4" [P]. 中国发明专利, 专利号 CN 112563801 A, 授权公告日 2020-02-06.
发明人刘建华,罗永刚,徐明华. "A Process for Preparing High-Purity Oxonic Acid Impurity 4" [P]. 中国发明专利, 专利号 CN 111125901 B, 授权公告日 2016-11-13.
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