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The asymmetric unit of the title compound, C9H9N2+·C4H3O4·0.5C4H4O4, consists of one 2-phenyl­imidazolium cation, one hydrogen fumarate anion and half a fumaric acid mol­ecule, which lies on an inversion center. N—H...O and O—H...O hydrogen bonds connect the cations, anions and fumaric acid mol­ecules into sheets parallel to the (102) plane.
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