Notably distorted, adamandoid Cu10 cages with Cu···Cu edges of 10.795(6) Å (Cu−CN−Sn(Me3)−NC−Cu) and 7.142(5) Å (Cu−pyrazine−Cu) are the basic building blocks of the novel supramolecular assembly [CuCN·Me3SnCN·C4H4N2] (C4H4N2 = pyrazine). Interpenetration of three equivalent, distorted-diamondoid frameworks affords comparatively compact crystal packing.