1,1'-Biphenyl, 4,4'-dimethyl- 1-Methyl-4-(4'-methylphenyl)benzene 4,4'-Bitolyl 4,4'-Dimethyl-1,1'-biphenyl 4,4'-Dimethylbiphenyl 4,4'-Dimethyldiphenyl 4,4'-Ditolyl 613-33-2 Bi-p-tolyl Di-p-tolyl NSC90464 p,p'-Bitolyl