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The crystal structure of the title compound, [Zn(C 9 H 7 N 2 O 2 ) 2 (H 2 O)]·H 2 O, involves discrete mononuclear complex mol­ecules. The special positions on the rotation twofold axis are occupied by Zn II  and O atoms of the coordinated and uncoordinated water mol­ecules. The coordination around the Zn II  atom can be described as transitional from trigonal-bipyramidal to square-pyramidal. The two chelating 2-methyl-4-oxopyrido[1,2- a ]pyrimidin-9-olate ligands and the coordin­ated water mol­ecule form the Zn coordination. O—H⋯O hydrogen bonds between the coordinated water mol­ecule and the ligand and between the uncoordinated water mol­ecule and the ligand dominate the crystal packing.

Aquabis(2-methyl-4-oxopyrido[1,2-a]pyrimidin-9-olato)zinc(II) monohydrate