N,N‐Di­methyl­anilinium 3‐cyano‐4‐(di­cyano­methyl­ene)‐5‐oxo‐4,5‐di­hydro‐1H‐pyrrol‐2‐olate

In the title compound, C₈H₁₂N⁺·C₈HN₄O₂^?, the anion and cation lie on a crystallographic mirror plane and form planar ribbons via N—H?O N?O = 2.933 (4) Å, H?O = 2.01 Å and N—H?O = 170°] and N—H?N N?N = 3.016 (5) Å, H?N = 2.15 Å and N—H?N = 169°] hydrogen bonds. The ribbons are further linked via weak C—H?O and C—H?N hydrogen bonds. In adjacent planes, anions lie opposite cations; π–π interactions (separation a/2 = 3.520 Å) exist between the anions and the cations, and stacks are formed, running along the a axis. The cations are disordered over two interpenetrating sites, with occupancies of 0.833 (5) and 0.167 (5).