3,4-Dichlorosulfolane 3,4-Dichlorotetrahydrothiophene 1,1-dioxide 3001-57-8 DAC PRD DAC PRO Dichlorothiolane dioxide NSC 13391 NSC 27866 NSC 35959 PRD PRD experimental nematocide THIOPHENE, TETRAHYDRO-3,4-DICHLORO-, 1,1-DIOXIDE Thiophene, 3,4-dichlorotetrahydro-, 1,1-dioxide Thiophene, 3,4-dichlorotetrahydro-, 1,1-dioxide (8CI)(9CI)