Crystal structure of 5-hy­droxy-5-propyl­barbituric acid

Mol­ecules of the title compound, C(7)H(10)N(2)O(4), systematic name 5-hy­droxy-5-propyl­pyrimidine-2,4,6(1H,3H,5H)-trione, form a hydrogen-bonded framework which is based on three independent hydrogen bonds, N—H⋯O(carbon­yl), N—H⋯O(hy­droxy) and O—H⋯O(carbon­yl). This framework has the topology of the 5-connected nov net. Each mol­ecule is linked to five other mol­ecules via six hydrogen bonds, and the descriptor of the hydrogen-bonded structure is F6(5)[4(4).6(6)-nov]. The crystal packing is isostructural with that of the previously reported 5-hy­droxy-5-ethyl analogue.