title: 4-Ethyl-amino-3-nitro-benzoic acid.
abstract: In the title compound, C(9)H(10)N(2)O(4), an intra-molecular N-H⋯O hydrogen-bond inter-action generates an S(6) ring motif. The nitro group is slightly twisted away from its attached benzene ring [dihedral angle = 15.29 (15)°]. In the crystal structure, mol-ecules are stacked down the a axis caused by short O⋯O(-1-x, -y, 2-z) contacts of 2.6481 (16) Å involving the O atoms of the nitro groups. The crystal packing is consolidated by inter-molecular O-H⋯O hydrogen bonds, linking the mol-ecules into centrosymmetric dimers.
authors.forename: Shivanagere Nagojappa
authors.initials: SN
authors.lastname: Narendra Babu
authors.forename: Aisyah Saad
authors.initials: AS
authors.lastname: Abdul Rahim
authors.forename: Shafida
authors.initials: S
authors.lastname: Abd Hamid
authors.forename: Ching Kheng
authors.initials: CK
authors.lastname: Quah
authors.forename: Hoong-Kun
authors.initials: HK
authors.lastname: Fun