3,3,4,4-Tetrachlorotetrahydrothiophene 1,1-dioxide 3,3,4,4-Tetrachlorotetrahydrothiophene-1,1-dioxide 3737-41-5 CP 78601 Caswell No. 833B DAC 649 DS 649 EINECS 223-113-9 EPA Pesticide Chemical Code 103101 Nopcocide DS 649 Tetrahydro-3,3,4,4-tetrachlorothiophene 1,1-dioxide Thiophene, 3,3,4,4-tetrachlorotetrahydro-, 1,1-dioxide Thiophene, tetrahydro-3,3,4,4-tetrachloro-, 1,1-dioxide