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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 R 2 2(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.

In the title compound, C15H15N3O6, the dihedral angle between the planes of the benzene and imidazole rings is 34.93 (10)°. An intra­molecular C—H⋯O hydrogen bond is observed. In the crystal, O—H⋯N hydrogen bonds link the mol­ecules into chains parallel to the c axis.