2,5-Bis(1,3-dithiol-2-ylidene)-1,3-dithiolane-4-thione

The asymmetric unit of the title compound, C9H4S7, contains two independent molecules, in one of which the central five-membered ring is disordered over two orientations in a 0.924 (3):0.076 (3) ratio. The molecular skeleton is almost planar: the average distance of the atoms from their mean plane is 0.128 (7) angstrom in the ordered molecule, and 0.088 (5) and 0.123 (2) angstrom in the major and minor disorder components, respectively. The ordered and disordered molecules form separate columns by stacking along the b axis. Adjacent columns interact via short S center dot center dot center dot S [3.33 (2), 3.434 (3), 3.444 (2), 3.503 (2), 3.519 (3) and 3.53 (4) angstrom] and S center dot center dot center dot H [2.814 (2), 2.87 (7), 2.92 (2), 2.9269 (18), 2.93 (2), 2.94 (2), 2.939 (2), 2.967 (2) and 2.974 (1) angstrom] contacts.