Crystal structure of dimethylammonium hydrogen oxalate hemi(oxalic acid)

The title salt consists of a di­methyl­ammonium cation (Me2NH2 +), an hydrogenoxalate anion (HC2O4 −), and half a mol­ecule of oxalic acid (H2C2O4) situated about an inversion center. They are linked together through inter­molecular hydrogen bonds, forming a two-dimensional bilayer-like self-assembly.