(2,4-dioxo-1H-pyrimidin-5-yl) acetate

5-(2-phenylhydrazinyl)-1H-pyrimidine-2,4-dione

5,6-diethoxy-5-hydroxy-1,3-diazinane-2,4-dione

3-methyl-4,5-dihydro-2H-pyrimido[4,5-e][1,3]oxazine-6,8-dione