2-Carboxy-1-(3-nitrophenyl)ethanaminium perchlorate

In the title compound, C9H11N2O4+·ClO4−, the organic cations form centrosymmetric dimers via a pair of O—H...O hydrogen bonds between the carboxyl groups. In the crystal, N—H...O interactions between the protonated amine group and the perchlorate anions and the nitro group connect the components into a two-dimensional network parallel to (001)