Crystal structure and biological evaluation of 4-methyl­morpholin-4-ium 1,3-dimethyl-2,6-dioxo-5-(2,4,6-tri­nitro­phen­yl)-1,2,3,6-tetra­hydro­pyrimidin-4-olate

The title mol­ecular salt, C(5)H(12)NO(+)·C(12)H(8)N(5)O(9) (−) [common name: 4-methyl­morpholin-4-ium 1,3-dimethyl-5-(2,4,6-tri­nitro­phen­yl)barbiturate], possesses noticeable anti­convulsant and hypnotic activity. In the anion, the 1,3-di­methyl­barbituric acid ring and the symmetrically substituted tri­nitro­phenyl ring, linked via a C—C bond, are not coplanar but subtend an angle of 44.88 (7)°. The six-membered ring of the 4-methyl­morpholin-4-ium cation has a chair conformation. In the crystal, the cation and anion are linked via an N—H⋯O hydrogen bond. The cation–anion units are linked by a number of C—H⋯O hydrogen bonds, forming a three-dimensional network.