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In the title compound, C5H2S4, the terminal monocyclic S atom deviates by 0.117 (1) Å from the mean plane of the other non-H atoms (r.m.s. deviation = 0.001 Å). All six C—S bonds and the central C—C bond in the rings are characterized by π-conjugated lengths, endowing the molecule with high π-conjugation. In the crystal, the molecules are parallel packed, forming columnar stacks along the a axis. Short intermolecular S...S contacts [3.397 (1) and 3.486 (1) Å], are observed.