Poly[[diaqua(μ<sub>4</sub>-benzene-1,2,4,5-tetracarboxylato)tetrakis(1<i>H</i>-imidazole-κ<i>N</i><sup>3</sup>)dicopper(II)]<i>N</i>,<i>N</i>-dimethylformamide monosolvate]
Acta crystallographica. Section E