(6-Oxido-2-oxo-1,2-dihydropyrimidine-5-carboxylato-κ<sup>2</sup><i>O</i><sup>5</sup>,<i>O</i><sup>6</sup>)(4-oxido-2-oxo-1,2-dihydropyrimidin-3-ium-5-carboxylato-κ<sup>2</sup><i>O</i><sup>4</sup>,<i>O</i><sup>5</sup>)bis(1,10-phenanthroline-κ<sup>2</sup><i>N</i>,<i>N</i>′)erbium(III) dihydrate
Acta crystallographica. Section E