2-[(E)-1-(4-ethyl-3-oxo-1,4-benzoxazin-6-yl)ethylideneamino]oxyacetic acid

2-(diethylamino)ethyl 2-[(Z)-1-(4-ethyl-3-oxo-1,4-benzoxazin-6-yl)ethylideneamino]oxyacetate

ethyl 2-(6-acetyl-3-oxo-1,4-benzoxazin-4-yl)acetate

benzyl 6-methyl-4-(4-nitrophenyl)-2-oxo-3,4-dihydro-1H-pyridine-5-carboxylate