153004-49-0 2H-1-Benzopyran-2-carboylic acid, 3,4-dihydro-4-(1,4-dihydro-4-oxo-5-pyrimidinyl)-, ethyl ester Ethyl 4-(1,4-Dihydro-4-oxo-5-pyrimidinyl)-3,4-dihydro-2H-1-benzopyran-2-carboxylate