Retracted: A novel heterocyclic compound: catena-poly[[[diaquasodium(I)]-di-μ-aqua] hemi(1,5-dihydr­oxy-4,8,9-trioxa-2,6-diaza­bicyclo­[3.3.1]nona-2,6-diene-3,7-diolate)]

In the title compound, {[Na(H₂O)₄]₂(C₄H₂N₂O₇)}_n, the 1,5-dihydr­oxy-4,8,9-trioxa-2,6-diaza­bicyclo­[3.3.1]nona-2,6-diene-3,7-diolate anion lies across a twofold axis in the space group C2/c; there are two independent Na sites, one on a twofold axis and the other on a centre of inversion. Hydrogen bonds link the {[Na(H₂O)₄]⁺}_n chains and diolate anions into a three-dimensional framework.