2,2'-ethyne-1,2-diyldithiophene 2,2?-ethyne-1,2-diyldithiophene InChI=1/C10H6S2/c1-3-9(11-7-1)5-6-10-4-2-8-12-10/h1-4,7-8 thiophene, 2,2'-(1,2-ethynediyl)bis-