benzenemethanol, 2-chloro-.alpha.-(4-chlorophenyl)-.alpha.-(trichloromethyl)- ; benzenemethanol, 4-chloro-.alpha.-(2-chlorophenyl)-.alpha.-(trichloromethyl)- ; 4-chloro-alpha-(2-chlorophenyl)-alpha-(trichloromethyl)benzenemethanol ; benzenemethanol, 4-chloro-alpha-(2-chlorophenyl)-alpha-(trichloromethyl)- ; benzenemethanol, 2-chloro-alpha-(4-chlorophenyl)-alpha-(trichloromethyl)- ; 2,2,2-trichloro-1-(2-chlorophenyl)-1-(4-chlorophenyl)ethanol ; o,p'-dicofol ; 1-(o-chlorophenyl)-1-(p-chlorophenyl)-2,2,2-trichloroethanol ; o,p-dicofol ; ethanol, 1-(2-chlorophenyl)-1-(4-chlorophenyl)-2,2,2-trichloro- ; 2,4'-dicofol ; 2,4'-dicofol 10 ?g/ml in cyclohexane ; 2,4'-dicofol solution, 10 mg/l, 10 ml (rm, iso guide 34)