(E)-Ethyl 2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)acrylate

The title compound, C12H10N2O6, was synthesized via a Knoevenagel condensation and crystallized from ethanol. In the crystal, strong classical intermolecular O—H...O hydrogen bonds and weak C—H...N contacts link the molecules into ribbons extending along [010]. Intramolecular O—H...O and C—H...N contacts support the planar conformation of the molecules (mean deivation 0.0270 Å).