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The title polymer, [Zn3(C8H8O5)2(C3H3N2)2(C3H4N2)2]n, was formed by the reaction of zinc acetate with imidazole and 7-oxabicyclo­[2.2.1]heptane-2,3-dicarboxylic anhydride (norcan­tharidine). One of the two crystallographically unique ZnII atoms is four-coordinated by three N atoms of three imidazole ligands, two of which are deprotonated, and by one carboxyl­ate O atom of the demethyl­cantharate anion. The second ZnII atom is situated on an inversion centre and is six-coordinated by the bridging O atoms of two symmetry-related demethyl­cantharate anions and by four carboxyl­ate O atoms of the corresponding carboxyl­ate groups. The polymeric crystal structure is additionally stabilized by N—H...O hydrogen bonding between the imidazole ligands and carboxyl­ate O atoms.
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