4-tert-Butyl­amino-3-nitro­benzoic acid

In the title compound, C(11)H(14)N(2)O(4), all non-H atoms lie in a mirror plane except for one of the methyl groups which deviates from the mirror plane by 0.919 (3) Å and is twisted by a torsion angle of 62.9 (2)°. An intra­molecular N—H⋯O hydrogen bond generates an S(6) ring motif. In the crystal packing, the mol­ecules are linked together by O—H⋯O hydrogen bonds, forming dimers with graph-set motif R (2) (2)(8) which propagate along the a-axis direction. C—H⋯O contacts link adjacent dimers with a graph-set motif C (2) (2)(7), forming chains along b, and further consolidate the structure into a three-dimensional network. The crystal packing is further strengthened by short inter­molecular O⋯O=C [2.655 (4) Å] contacts.