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In the title compound, {[Mn(C 14 H 16 N 5 O 3 ) 2 ]·2H 2 O}  n  , the Mn II  atom (site symmetry) exhibits a distorted  trans -MnN 2 O 4  octa­hedral geometry defined by two monodentate  N -bonded and two bidentate  O,O ′-bonded 8-ethyl-5-oxo-2-(piperazin-1-yl)-5,8-dihydro­pyrido[2,3- d ]pyrimidine-6-carboxyl­ate anions. An N—H⋯O hydrogen bond is present in the crystal structure. The extended two-dimensional structure is a square grid and the disordered uncoordinated water mol­ecules occupy cavities within the grid.

Poly[[bis[μ2-8-ethyl-5-oxo-2-(piperazin-1-yl)-5,8-dihydropyrido[2,3-d]pyrimidine-6-carboxylato]manganese(II)] dihydrate]

Poly[[bis[μ₂-8-ethyl-5-oxo-2-(piperazin-1-yl)-5,8-dihydropyrido[2,3-d]pyrimidine-6-carboxylato]manganese(II)] dihydrate]