Biphenyl-4,4'-dithiol (CAS No.6954-27-4), its synonyms are (1,1'-biphenyl)-4,4'-dithiol ; 4,4′-Dimercaptobiphenyl ; 4,4'-Biphenyldithiol ; 4,4'-Dimercaptobiphenyl ; 4,4'-Thiobiphenyl .