R factor = 0.037; wR factor = 0.111; data-to-parameter ratio = 16.0. In the title compound, C9H10N2O3, the Schiff base molecule is approximately planar, the dihedral angle between the benzene ring and the acetohydrazide group (r.m.s. deviation = 0.034 A ˚) being 8.81 (7). An intramolecular O—H O hydrogen bond is observed. In the crystal, molecules are linked into a threedimensional network by O—H O, N—H O and C— H O hydrogen bonds. Related literature For general background to Schiff bases, see: Cimerman et al. (1997); Offe et al. (1952); Richardson et al. (1988). For related structures, see: Li et al. (2008); Tamboura et al. (2009). = 0.11 mm 1 T = 223 K Data collectio
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