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Methyl 2-methyl-3-oxo-3,4-dihydro-2H-benzo[b][1,4]oxazine-6-carboxylate: BD201380179950-77-795%; ￥1172.01g

2-Methyl-2H-benzo[b][1,4]oxazin-3(4H)-one: BD7660221744-83-297%; ￥114.01g

2-Methyl-3-oxo-3,4-dihydro-2H-benzo[b][1,4]oxazine-6-carboxylic acid: BD2016401092352-65-295%; ￥609.0250mg

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