Glycinium maleate

In the title compound, C₂H₆NO₂⁺·C₄H₃O₄⁻, the glycine mol­ecule exists in the cationic form with a positively charged amino group and an uncharged carboxyl­ic acid group. The maleic acid mol­ecule exists in a mono-ionized state. In the semimaleate ion, an intramolecular OH⋯O hydrogen bond is found to be asymmetric. The glycinium and semimaleate ions aggregate into alternate columns extending along the c axis. A C—H⋯O hydrogen bond is also observed.