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.