3,4-Dichlorosulfolane 3,4-Dichlorotetrahydrothiophene 1,1-dioxide 3001-57-8 DAC PRD DAC PRO Dichlorothiolane dioxide NSC13391 PRD PRD experimental nematocide Thiophene, 3,4-dichlorotetrahydro-, 1,1-dioxide Thiophene, tetrahydro-3,4-dichloro-, 1,1-dioxide WLN: T5SWTJ CG DG