title: Bis(2-carboxy-anilinium) sulfate monohydrate.
abstract: In the title hydrated mol-ecular salt, 2C(7)H(8)NO(2) (+)·SO(4) (2-)·H(2)O, each cation in the asymmetric unit is stabilized by an intra-molecular N-H⋯O hydrogen bond. The O atoms of the sulfate ion are disordered over two sets of sites with an occupancy ratio of 0.541 (13):0.459 (13), which possibly optimizes the acceptance of N-H⋯O hydrogen bonds from the cations. The crystal structure also features aromatic π-π stacking [centroid-centroid separation = 3.842 (2) Å] and a C-H⋯π inter-action.
authors.forename: Taslim
authors.initials: T
authors.lastname: Akhtar
authors.forename: Khawar
authors.initials: K
authors.lastname: Masih
authors.forename: M Nawaz
authors.initials: MN
authors.lastname: Tahir
authors.forename: Muhammad Ilyas
authors.initials: MI
authors.lastname: Tariq
authors.forename: Shahid
authors.initials: S
authors.lastname: Iqbal