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The title layered coordination polymer, [Cd(C 14 H 16 N 5 O 3 ) 2 ]  n   or [Cd(ppa) 2 ]  n  , where ppa is 8-ethyl-5-oxo-2-(piperazin-1-yl)-5,8-dihydro­pyrido[2,3- d ]pyrimidine-6-carboxyl­ate, was syn­thesized under hydro­thermal conditions. The Cd II  atom (site symmetry 2) exhibits a distorted  cis -CdN 2 O 4  octa­hedral geometry defined by two  N -monodentate and two  O , O ′-bidentate ppa monoanions. The extended two-dimensional structure resulting from the bridging ppa species is a grid lying parallel to (001). An N—H⋯O hydrogen bond helps to establish the crystal packing.

Poly[bis[8-ethyl-5-oxo-2-(piperazin-1-yl)-5,8-dihydropyrido[2,3-d]pyrimidine-6-carboxylato]cadmium]