5-[1-(1,3-Dimethyl-2,4,6-trioxohexa-hydropyrimidin-5-yl)-2-oxoprop-yl]-1,3-di-methyl-pyrimidine-2,4,6(1H,3H,5H)-trione.

The title compound, C15H18N4O7, is a product of the substitution reaction of 5,5-di-bromo-1,3-di-methyl-barbituric acid with sodium sulfide in aqueous acetone. In the crystal, mol-ecules display neither inter-molecular nor intra-molecular hydrogen bonding and the two barbiturate rings adopt the keto form.