Crystal structure and Hirshfeld surface analysis of poly[[bis[μ<sub>4</sub>-<i>N</i>,<i>N</i>′-(1,3,5-oxadiazinane-3,5-diyl)bis(carbamoylmethanoato)]nickel(II)tetrapotassium] 4.8-hydrate]
Acta crystallographica. Section E, Crystallographic communications