title: 2-(1,3-Di-thiol-2-yl-idene)-1,3-di-thiole-4-carbaldehyde.
abstract: The structure of the title compound, C7H4OS4, at 100 K has ortho-rhom-bic symmetry. In the crystal, tetra-thia-fulvalene mol-ecules form π-stacks along the a axis, with a stacking distance of 3.4736 (6) Å. Along the b axis, parallel stacks are inter-connected with each other through a network of weak C-H⋯O hydrogen bonds and short S⋯S contacts [3.4813 (7) Å]. Additional short S⋯S contacts [3.4980 (9) Å] join parallel stacks along the c axis.
authors.affiliation: Youngstown State University, One University Plaza, Youngstown, OH 44555-3663, USA.
authors.forename: Matthias
authors.initials: M
authors.lastname: Zeller
authors.forename: Vladimir A
authors.initials: VA
authors.lastname: Azov
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