1,1'-Biphenyl, 2,2'-bis(trifluoromethyl)- 2,2'-Bis(trifluoromethyl)-1,1'-biphenyl 2,2'-Bis(trifluoromethyl)biphenyl 2,2'-Bitolyl, alpha,alpha,alpha,alpha',alpha',alpha'-hexafluoro- 567-15-7