发明人张德明,何建平,郑宇鹏. "Method for the Synthesis of Roxadustat Impurity 7" [P]. 中国发明专利, 专利号 CN 113747926 B, 授权公告日 2020-07-13.
发明人朱建伟,赵玉洁,胡光. "A Process for Preparing High-Purity Roxadustat Impurity 7" [P]. 中国发明专利, 专利号 CN 116710077 B, 授权公告日 2022-05-19.
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