2-[(E)-(2-Morpholinoeth­yl)iminiometh­yl]-4-nitro-1-oxocyclo­hexa­dienide

The mol­ecule of the title compound, C(13)H(17)N(3)O(4), exists as a zwitterion, with the H atom of the phenol group being transferred to the imine N atom. The C=O, C(Ar)—C(Ar) and C—N bond lengths are in agreement with the oxocyclo­hexa­dienide–iminium zwitterionic form. A strong intra­molecular N(+)—H⋯O hydrogen bond generates an S(6) ring motif. The morpholine ring adopts a chair conformation. In the crystal, mol­ecules are linked into centrosymmetric dimers by inter­molecular N—H⋯O hydrogen bonds. In addition, C—H⋯O hydrogen bonds and very weak C—H⋯π inter­actions are observed.