发明人郑宇鹏,韩伟,冯建国. "Method for the Synthesis of 2-Methyl-3-oxo-3,4-dihydro-2H-benzo[b][1,4]oxazine-8-carboxylic acid" [P]. 中国发明专利, 专利号 CN 110629063 B, 授权公告日 2023-07-08.
发明人沈红梅,罗永刚,高志强. "A Process for Preparing High-Purity 2-Methyl-3-oxo-3,4-dihydro-2H-benzo[b][1,4]oxazine-8-carboxylic acid" [P]. 中国发明专利, 专利号 CN 110571249 A, 授权公告日 2018-08-01.
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