发明人罗永刚,高志强,沈红梅. "Method for the Synthesis of 4-(4-Methyl-3-oxo-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-4-oxobutanoic acid" [P]. 中国发明专利, 专利号 CN 111413753 A, 授权公告日 2019-09-21.
发明人罗永刚,孙丽萍,唐晓军. "A Process for Preparing High-Purity 4-(4-Methyl-3-oxo-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-4-oxobutanoic acid" [P]. 中国发明专利, 专利号 CN 115034842 B, 授权公告日 2019-07-08.
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