[Zn(C8H6NO4)2(H2O)2]2H2O

R factor = 0.034; wR factor = 0.098; data-to-parameter ratio = 14.8. The ZnII atom in the title polymeric compound, {[Zn(C8H6-NO4)2(H2O)2]2H2O}n, lies on a center of inversion and is coordinated by two amine N atoms and two carboxylate O atoms from two 3-amino-5-carboxybenzoate anions along with two water molecules in a distorted octahedral geometry. The bridging nature of the anion generates a layer motif parallel to (100). Hydrogen bonds of the N—H O and O—H O types exist in the structure. One H atom of the coordinated water molecule and one H atom of the solvent water molecule are each disordered over two positions in a 1:1 ratio. Related literature For catena-poly[(5-aminoisophthalato)aquazinc], see: Wu et al