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Acta Cryst. (2006). E62, o2653-o2654 [ doi:10.1107/S160053680601988X ]
Abstract: The title molecule, C9H9NO4, possesses crystallographically imposed twofold rotation symmetry. In the crystal structure, the molecules are stacked into ladders extended along the c axis, with a short intermolecular O
C contact of 3.297 (2) Å. The crystal packing is stabilized by carbonyl dipolar interactions and van der Waals forces.
Online 9 June 2006
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