发明人何建平,张德明,马晓峰. "Method for the Synthesis of Methyl 4-methyl-3-oxo-3,4-dihydro-2H-benzo[b][1,4]oxazine-8-carboxylate" [P]. 中国发明专利, 专利号 CN 113617204 A, 授权公告日 2020-03-12.
发明人高志强,罗永刚,陈志强. "A Process for Preparing High-Purity Methyl 4-methyl-3-oxo-3,4-dihydro-2H-benzo[b][1,4]oxazine-8-carboxylate" [P]. 中国发明专利, 专利号 CN 112423667 B, 授权公告日 2020-09-01.
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