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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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In the title structure, C25H24FN3O5, a strong intra­molecular O—H...O hydrogen bond is present between the carb­oxy group at the 3-position and the carbonyl group at the 4-position. In the crystal, mol­ecules are held together by weak C—H...O, C—H...F and π–π [centroid–centroid distance 3.6080 (8) Å] inter­actions. The 1,4-dihydro­quinoline ring and cyclo­propyl group are not in the same plane, making an inter­planar angle of 57.52 (8)°.
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