Three-dimensional hydrogen-bonded assembly in 2,2'-disulfanyl­idene-5,5'-biimidazolidinyl­idene-4,4'-dione-di­methyl­formamide-water (3/2/4)

2,2'-Disulfanyl­idene-5,5'-biimidazolidinyl­idene mol­ecules aggregate through N-H...S hydrogen-bonding inter­actions with cyclic motifs [graph set (8)], giving two-dimensional ribbon structures which are close to being parallel. Two independent water mol­ecules associate to form centrosymmetric cyclic hydrogen-bonded (H₂O)₄ tetra­mer units [graph set (8)].