Acta Cryst. (2012). E68, o206 [ doi:10.1107/S1600536811053797 ]
Abstract: In the crystal structure of the title compound, C8H5NO6, both carboxyl groups are involved in intermolecular centrosymmetric cyclic O-HO hydrogen-bonding associations, which give a zigzag chain structure extending along (21). Weak - stacking interactions are also present [minimum ring centroid separation = 3.893 (4) Å].
Online 21 December 2011
Copyright © International Union of Crystallography