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The title compound, C7H8N2O4, is a zwitterion, [formal name = (S)-3-carboxy-2-(imidazol-3-ium-1-yl)propanoate], in which the deprotonated negatively charged carboxylate end shows almost identical C—O bond distances [1.248 (4) and 1.251 (4) Å] due to resonance. The molecules are involved in intermolecular O—H...O and N—H...O hydrogen bonds, which define a tightly bound three-dimensional structure.