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In the hydrazone molecule of the title compound, C 13 H 9 I 2 N 3 O 2 ·CH 3 CN, the aromatic rings form a dihedral angle of 9.4 (3)°. In the crystal structure, inter­molecular I⋯N inter­actions [3.099 (4) Å] link hydrogen-bonded aggregates of the hydrozone and solvent molecules related by translation along the  b  axis into chains. An intramolecular O—H⋯N hydrogen bond forms an  S (6) ring.

(E)-N′-(2-Hydroxy-3,5-diiodobenzylidene)nicotinohydrazide acetonitrile monosolvate