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发明人郑宇鹏,冯建国,孙丽萍. "Method for the Synthesis of Ethyl 2-(6-chloro-3-oxo-2,3-dihydro-4H-benzo[b][1,4]oxazin-4-yl)acetate" [P]. 中国发明专利, 专利号 CN 117807869 B, 授权公告日 2018-09-17.
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