发明人何建平,郑宇鹏,徐明华. "Method for the Synthesis of 4-(3-Oxo-2,3-dihydro-4H-benzo[b][1,4]oxazin-4-yl)butanoic acid" [P]. 中国发明专利, 专利号 CN 109660551 A, 授权公告日 2024-02-20.
发明人罗永刚,郑宇鹏,马晓峰. "A Process for Preparing High-Purity 4-(3-Oxo-2,3-dihydro-4H-benzo[b][1,4]oxazin-4-yl)butanoic acid" [P]. 中国发明专利, 专利号 CN 116630265 B, 授权公告日 2021-03-18.
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