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The asymmetric unit of the title complex, [Cu2(CN)2(C20H16N6S2)]n, contains one CuI cation, one cyanide ligand and half of a centrosymmetric 1,2-bis[4-(3-pyridyl)pyrimidin-2-ylsulfanyl]ethane (bppe) ligand. The CuI atom displays a trigonal coordination geometry, being surrounded by one C atom from one cyanide anion and two N atoms from one cyanide and one bppe ligand. In the complex, each cyanide anion links two CuI atoms in a bis-monodentate mode into a zigzag [–Cu—CN–]n chain. Two parallel chains are linked by bppe ligands into a ladder chain.