2H,6H-Pyrimido[2,1-b][1,3]thiazine-7-carboxylic acid, 6-(4-bromophenyl)-3,4-dihydro-8-methyl-4-oxo-, ethyl ester;Ethyl 6-(4-bromophenyl)-8-methyl-4-oxo-3,4-dihydro-2H,6H-pyrimido[2,1-b][1,3]thiazine-7-carboxylate
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