Bis[diamino(ethoxycarbonylamino)methylium] sulfate

In the molecule of the title compound, 2C4H10N3O2+·SO4−, the cations are planar (r.m.s. deviations = 0.0144 and 0.0236 Å) and oriented at a dihedral angle of 62.30 (4)°. Intramolecular N—H...O hydrogen bonds result in the formation of two planar six-membered rings. The cations are linked to the sulfate ion through intermolecular C—H...O and N—H...O hydrogen bonds, forming an R22(8) ring motif. In the crystal structure, intermolecular N—H...O and C—H...O hydrogen bonds link the molecules into a three-dimensional network