A second solvatomorph of poly[[μ<sub>4</sub>-<i>N</i>,<i>N</i>′-(1,3,5-oxadiazinane-3,5-diyl)bis(carbamoylmethanoato)]nickel(II)dipotassium]: crystal structure, Hirshfeld surface analysis and semi-empirical geometry optimization
Acta crystallographica. Section E, Crystallographic communications