1,1-Dimethyl-2,2-diphenylethene 1,1-Dimethyl-2,2-diphenylethylene 1,1-Diphenyl-2-methylpropene 1,1-Diphenylisobutylene 2-Methyl-1,1-diphenylpropene 781-33-9 Benzene, 1,1'-(2-methyl-1-propenylidene)bis- NSC27917 Propene, 2-methyl-1,1-diphenyl-