.alpha.,.alpha.,.beta.,.beta.-Tetraphenylethane 1,1,2,2-Tetraphenylethane 632-50-8 Benzene, 1,1',1'',1'''-(1,2-ethanediylidene)tetrakis- Benzene, 1,1',1'',1'''-ethenetetrayltetrakis- Bibenzhydryl Ethane, 1,1,2,2-tetraphenyl- NSC39908 Tetraphenylethylene dianion sodium salt sym-Tetraphenylethane