N,N-Diethyl-2-hy-droxy-ethanaminium 2,6-dioxo-5-(2,4,6-trinitro-phen-yl)-1,2,3,6-tetra-hydro-pyrimidin-4-olate dihydrate.

In the title mol-ecular salt, C(6)H(16)NO(+)·C(10)H(4)N(5)O(9) (-)·2H(2)O, which crystallizes as a dihydrate, O-H⋯O hydrogen bonds link the barbiturate anion, the ethanaminium cation and the water mol-ecules of crystallization. The dihedral angle between the rings in the anion is 43.71 (8)°. In the crystal, an R(2) (2)(8) ring motif hydrogen-bonding pattern is also found involving inversion-related barbiturate rings with N-H⋯O hydrogen bonds. As a result of the various hydrogen bonds an infinite two-dimensional network, propagating in (10[Formula: see text]), is formed.