Diammonium biphenyl-4,4'-disulfonate.

In the title salt, 2NH(4) (+)·C(12)H(8)O(6)S(2) (2-), the dianion has crystallographic inversion symmetry. A three-dimensional framework is formed from primary hydrogen-bonded sheet structures comprising ammonium N-H⋯O(sulfonate) inter-actions and is linked peripherally through the biphenyl residues of the anions. This open framework has 43†à (3) solvent-accessible voids.