(Benzimidazol-3-ium-2-ylmeth­yl)(benzimidazol-2-ylmeth­yl)aminium sulfate

In the title crystal structure, C₁₆H₁₇N₅²⁺·SO₄²⁻, cations and anions are linked via N—H...O hydrogen bonds, while ion pairs form extended one-dimensional chains through inter­molecular N—H...N hydrogen bonds.