Strong symmetrical intramolecular hydrogen bonds in diprotonated piperazinium bis(hydrogenmaleate)

In the title salt, C4H12N22+.2C(4)H(3)O(4)(-), the diprotonated piperazine cation links to two hydrogen maleate anions through N-H...O hydrogen bonds. An H atom is approximately centered in an extremely short intramolecular hydrogen bond of the O...H...O type in each of the hydrogen maleate anions.