.alpha.,.alpha.-Diphenylethylene .alpha.-Methylene-diphenylmethane .alpha.-Phenylstyrene 1,1-Diphenylethene 1,1-Diphenylethylene 530-48-3 Benzene, 1,1'-ethenylidenebis- DDNU Diphenylethylene Ethylene, 1,1-diphenyl- NSC57645 as-Diphenylethylene