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The title compound, C12H15Br2N3O, is a hydrazone in which 3,5-dibromo-2-hydroxybenzaldehyde has reacted with 1-amino-4-methylpiperazine to form a product containing a C=N double bond. The piperazine ring adopts a chair conformation. The dihedral angle between the benzene ring and the C=N—N plane is 6.0 (5)°. Intramolecular O—H...N hydrogen bonding generates an S(6) ring motif, while short intermolecular Br...Br and Br...N contacts [3.5846 (10) and 3.379 (4) Å, respectively] link the molecules to form a three-dimensional network.