N,N-Diethyl-2-hy­droxy­ethanaminium 5-(2,4-di­nitro­phen­yl)barbiturate sesquihydrate

In the title hydrated mol­ecular salt, C₆H₁₆NO⁺·C₁₀H₅N₄O₇⁻·1.5H₂O [systematic name: N,N-diethyl-2-hy­droxy­ethan­am­in­ium 5-(2,4-di­nitro­phen­yl)-2,6-di­oxo-1,2,3,6-tetra­hydro­pyrim­idin-4-olate sesquihydrate], the dihedral angle between the six-membered rings in the anion is 37.66 (11)°. The nitro groups ortho and para to the ring junction are rotated from their attached ring by 40.8 (3) and 23.5 (3)°, respectively. The ethanol group is disordered over two of the `arms' of the cation in a statistical ratio. In the crystal, [010] chains of anions occur, linked by N—H...O and O—H...O hydrogen bonds, which generate R₂²(8) loops. Further N—H...O and O—H...O hydrogen bonds link the components into a three-dimensional network. One of the water O atoms lies near an inversion centre and is 50% occupied.