1,6-Dimercaptohexane 1,6-HEXANEDITHIOL 1,6-Hexamethylenedithiol 1,6-Hexanedimercaptan 1191-43-1 4-01-00-02559 (Beilstein Handbook Reference) BRN 1732507 EINECS 214-735-1 FEMA No. 3495 Hexamethylene dimercaptan Hexane-1,6-dithiol NDR-139 NSC 29031 USAF uctl-72