Received 31 May 2008
The title compound, C9H10N2O4·H2O, exists as a zwitterion with a deprotonated carboxyl group and a protonated amine group. The crystal packing is stabilized by intermolecular N-HO and O-HO hydrogen bonds, building sheets parallel to the (001) plane.
Data collection: CrystalClear (Rigaku, 2005); cell refinement: CrystalClear; data reduction: CrystalClear; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXL97.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: RZ2221 ).
This work was supported by a Start-up Grant from Southeast University to Professor Ren-Gen Xiong, and by the Excellent Doctor Degree Foundation from Southeast University to D-WF.
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