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The title phenyl­hydrazine derivative, C16H16N2O4, has a crystallographically imposed centre of symmetry. Except for the methyl group, all non-H atoms are almost coplanar (r.m.s. deviation = 0.0095 Å). Intra­molecular O—H...N hydrogen bonds are observed, generating S(6) graph-set ring motifs.

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In the title compound, C9H13N3O4, an ester of the anti-infection drug secnidazole, the dihedral angle between the nitro­imidazole mean plane (r.m.s. deviation = 0.028 Å) and the pendant acetate group is 43.17 (11)°. In the crystal, inversion dimers linked by pairs of C—H...O inter­actions generate R22(10) loops and further C—H...O hydrogen bonds link the dimers into [100] chains. Weak aromatic π–π stacking inter­actions with a centroid–centroid distance of 3.7623 (11) Å are also observed.
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