3,3',5,5'-Tetramethylbiphenyl-4,4'-diol
(R)-3,3'-Di-tert-butyl-5,5',6,6'-tetramethylbiphenyl-2,2'-diol
(S)-3,3'-Di-tert-butyl-5,5',6,6'-tetramethylbiphenyl-2,2'-diol
