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In the title compound, [Zn(C 14 H 17 N 5 O 3 )(C 9 H 4 O 6 )(H 2 O) 2 ]·H 2 O, the complex mol­ecule exists in a zwitterionic form. The Zn II  ion exhibits a distorted tetra­gonal-pyramidal geometry, being coordinated by two O atoms from the zwitterionic 8-ethyl-5-oxo-2-(piperazin-4-ium-1-yl)-5,8-dihydro­pyrido[2,3- d ]pyrimidine-6-carboxyl­ate ( L ) ligand, one O atom from the 5-carb­oxy­benzene-1,3-dicarboxyl­ate dianion, [H btc ] 2− , and two O atoms from two aqua ligands. In the crystal, N—H⋯O and O—H⋯O hydrogen bonds link the components into a three-dimensional structure. The crystal packing exhibits π–π inter­actions between the aromatic rings, with centroid–centroid distances in the range 3.466 (3)–3.667 (3) Å.

acta crystallographica. section e

Diaqua(5-carboxybenzene-1,3-dicarboxylato-κO1)[8-ethyl-5-oxo-2-(piperazin-4-ium-1-yl)-5,8-dihydropyrido[2,3-d]pyrimidine-6-carboxylato-κ2O5,O6]zinc monohydrate