1,3-dithiole, 2,2'-(1,2-ethanediylidene)bis- 2,2'-ethane-1,2-diylidenebis(1,3-dithiole) InChI=1/C8H6S4/c1(7-9-3-4-10-7)2-8-11-5-6-12-8/h1-6