1-Thio-2,2,3,3-tetrafluoro-2,3,4,5,8,9,10,11-octahydrocycloocta(b)thiophene 101931-91-3 Cycloocta(b)thiophene, 2,3,3a,4,5,8,9,9a-octahydro-2,2,3,3-tetrafluoro-