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The asymmetric unit of the triclinic polymorph of the title compound, C 21 H 25 N 3 O 3 , consists of two mol­ecules, whereas for the monoclinic polymorph Z′ = 1 [Fun  et al.  (2009  ▶ ).  Acta Cryst.  E 65 , o445]. The two mol­ecules exhibit an  E  configuration with respect to the C=N bond. The mol­ecules are linked into dimers by N—H⋯O and C—H⋯O hydrogen bonds forming  R   2   2 (8) ring motifs. In addition, π–π inter­actions occur between nitro­phenyl groups [minimum centroid–centroid distance 3.940 (2) Å], stacking the molecules along the  ac  plane.

A triclinic polymorph of (E)-2-(4-isobutylphenyl)-N′-[1-(4-nitrophenyl)ethylidene]propanohydrazide