The title compound, C7H8N2O4, 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 _-stacking [centroid– centroid distance 3.504 (3) A ° ] and weak C—H_ _ _O contacts.
Reeb, Sara A.; Shields, Marlesa C.; and Wheeler, Kraig A., "(+-)-3-Carboxy-2-(imidazol-3-ium-1-yl)- propanoate" (2009). Faculty Research and Creative Activity. Paper 3.