The title compound, C16H10N2O6·2H2O, crystallized in the centrosymmetric triclinic space group P1 with one organic molecule and two water molecules as the asymmetric unit. Eight intermolecular hydrogen bonds have donoracceptor distances in the range 2.602 (2)-3.289 (2) Å, with angles in the range 137 (2)-177 (2)°. These generate a three-dimensional hydrogen-bond network. There is a single intramolecular hydrogen bond. There are six significant intermolecular C-HO interactions with HO distances in the range 2.39-2.74 Å, and C-HO angles in the range 131-157°.
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