The crystal structure of poly-[(diaqua-bis(µ ₃ -6-aminopyridine-3-carboxylato-κ ₃ N,O,O ′)-(bis(µ ₄ -2,6-dioxo-1,2,3,6-tetrahydropyrimidine-4-carboxylato-κ ⁵ N,O:O′:O′′:O′′′)-(µ ₂ -oxalato-κ ⁴ O,O′:O′′,O′′′)dicobalt(II)dineodym(II)], C ₂₄ H ₁₈ Co ₂ N ₈ Nd ₂ O ₁₈