Crystals of the title compound (DBTTF), C₁₄H₈S₄, feature a triclinic polymorph different from two known monoclinic polymorphs. In this form, there are two independent centrosymmetric half-mol­ecules in the asymmetric unit. Although the mol­ecular orientations are relatively similar to one of monoclinic polymorphs, the packing motif is different.