Chlorodiphenyl ,its CAS NO. is 27323-18-8,the synonyms is o-Chlorobiphenyl ; Diphenylchloride ; o-Chlorodiphenyl ; Chlorodwufenol ; Monochlorobiphenyl ; 2-Chlorodiphenyl ; 2-Monochlorobiphenyl ; 2-Chlorbiphenyl .