Diaqua-bis-[8-ethyl-5-oxo-2-(piperazin-4-ium-1-yl)-5,8-dihydro-pyrido[2,3-d]pyrimidine-6-carboxyl-ato]copper(II) bis[4-(4-carboxyphenoxy)benzoate].

In the title compound, [Cu(C(14)H(17)N(5)O(3))(2)(H(2)O)(2)](C(14)H(9)O(5))(2), the Cu(2+) atom, located on an inversion centre, exhibits a distorted octa-hedral geometry, coordinated by four O atoms from two pipemidic acid ligands in equatorial positions and two water mol-ecules in axial positions. The pipemidic acid ligand acts a bidentate ligand and the single deprotonated 4,4'-oxydibenzoic acid acts as an anion. Classical N-H⋯O and O-H⋯O hydrogen bonds are present in the crystal structure.