Hughes D C, Yamamoto T, Roberts E F. "Method for the Synthesis of 4-Methyl-3-oxo-3,4-dihydro-2H-benzo[b][1,4]oxazine-8-carboxylic acid" [P]. US Patent, US 9834020 B2, 2021-04-26.
发明人李文辉,林芳,杨光. "A Process for Preparing High-Purity 4-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 116798049 B, 授权公告日 2022-03-18.
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