发明人罗永刚,陈志强,冯建国. "Method for the Synthesis of Ethyl 6-methyl-4-oxo-6H,7H-pyrazolo[3,2-c][1,4]oxazine-2-carboxylate" [P]. 中国发明专利, 专利号 CN 109650398 B, 授权公告日 2021-09-13.
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