Received 13 October 2008
The molecule of the title compound, C13H18N2O5, adopts a trans configuration with respect to the C=N bond. The dihedral angle between the benzene ring and the hydrazinecarboxylic acid plane is 49.75 (5)° and an intramolecular C-HO interaction occurs. In the crystal structure, the molecules are linked into a chain along  by N-HO hydrogen bonds, and a C-H contact further stabilizes the structure.
Data collection: SMART (Bruker, 2002); cell refinement: SAINT (Bruker, 2002); data reduction: SAINT; 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: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HB2820 ).
The authors thank Hangzhou Vocational and Technical College, China, for financial support.
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