9H-Carbazole-9-carbo­thioic di­thio­peroxy­anhydride

The whole mol­ecule of the title compound, C₂₆H₁₆N₂S₄, is generated by twofold rotational symmetry. The carbazole skeleton is nearly planar [maximum deviation = 0.054 (5) Å]. In the crystal, aromatic π–π stacking is observed between parallel carbazole ring systems of adjacent mol­ecules, the shortest centroid–centroid distances between pyrrole and benzene rings being 3.948 (3) and 3.751 (3) Å.