1-(2-Methyl-5-nitro-1H-imidazol-1-yl)propan-2-yl acetate.

In the title compound, C9H13N3O4, an ester of the anti-infection drug secnidazole, the dihedral angle between the nitro-imidazole 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 inter-actions generate R 2 (2)(10) loops and further C-H⋯O hydrogen bonds link the dimers into [100] chains. Weak aromatic π-π stacking inter-actions with a centroid-centroid distance of 3.7623 (11) Šare also observed.

Crystal structure of 2-{[1-(2-methyl-5-nitro-1H-imidazol-1-yl)propan-2-yl-oxy]carbon-yl}benzoic acid.

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