3,3'-Di-tert-butyl-4H,4'H-[1,1'-binaphthalenylidene]-4,4'-dione

2-(1,1-dimethylethyl)-4-[3-(1,1-dimethylethyl)-4-oxo-1(4H)-naphthalenylidene]-

2-(tert-Butyl)-4-[3-(tert-butyl)-4-oxo-1(4H)-naphthalenylidene]-1(4H)-naphthalenone

1(4H)-Naphthalenone, 2-(1,1-dimethylethyl)-4-[3-(1,1-dimethylethyl)-4-oxo-1(4H)-naphthalenylidene]-