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The title compound, C 7 H 8 N 2 O 4 , crystallizes as a zwitterion, with mol­ecules organized into mol­ecular sheets  via  carbox­yl–carboxyl­ate and N + —H⋯carboxyl­ate contacts. These sheets are constructed from translationally related mol­ecules that further link to neighboring motifs  via  π-stacking [centroid–centroid distance 3.504 (3) Å] and weak C—H⋯O contacts.

(±)-3-Carboxy-2-(imidazol-3-ium-1-yl)propanoate