The crystal of the title compound, C12H12S8, is a mixture of the 7,7'-
dimethylbis(ethylenedithio)tetrathiafulvalene and 7,8'-dimethylbis(eth
ylenedithio)tetrathiafulvalene isomers, in an almost 60:40 ratio. The
crystal is disordered with respect to the position of one of the methy
l substituents. The S atoms are involved in three-dimensional intermol
ecular S...S contacts with distances within 3.703 Angstrom.