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The title compound, C13H9Cl3N2, was obtained from a condensation reaction of benzaldehyde and 2,4,6-trichlorophenylhydrazine. The molecule assumes an E configuration with the phenyl ring and trichlorophenyl ring located on opposite sides of the C=N bond. The phenyl ring is oriented at a dihedral angle of 42.58 (12)° with respect to the tricholorophenyl ring. In the crystal, the molecules are linked via N—H...N hydrogen bonds, forming supramolecular chains running along the c axis. π–π stacking is present between parallel trichlorophenyl rings of adjacent molecules, the face-to-face and centroid–centroid distances being 3.369 (14) and 3.724 (2) Å, respectively.