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The asymmetric unit of the title compound, [CdCl2(C8H6N2O)2]n, consists of one molecule of the 3H-quinazolin-4-one ligand, one Cd2+ cation, which is located on a twofold axis, and one chlorido ligand in a general position. The latter bridges metal cations, forming a one-dimensional polymer along the b axis. The Cd...Cd distance along the chain is 3.7309 (7) Å. The octahedral coordination around the metal is completed by two ligands in a trans axial geometry which coordinate through the N atom in 1 position. Moderately strong classical N—H...O hydrogen bonds around crystallographic inversion centers cross-link adjacent polymeric chains.