2-{N′-[3-(Dimethyl­ammonio)prop­yl]oxamido}benzoate

The title compound, C14H19N3O4, exists as a zwitterion, with a tertiary N atom protonated and a carboxyl group deprotonated. In the crystal structure, the planar oxamide group displays a transoid conformation. The mol­ecules link to each other via hydrogen bonding, resulting in an extended supra­molecular chain along the b axis.