3,3'-Bis-(2-methylanilino)-4,4'-dioxo-1,1',4,4'-tetrahydro-1,1'-binaphthyliden
3,3'-Dianilino-4,4'-dioxo-1,1',4,4'-tetrahydro-1,1'-binaphthyliden
3,3'-Bis-(4-nitroanilino)-4,4'-dioxo-1,1',4,4'-tetrahydro-1,1'-binaphthyliden
3,3'-Bis-(4-methoxyanilino)-4,4'-dioxo-1,1',4,4'-tetrahydro-1,1'-binaphthyliden
3,3'-Bis-(4-methylanilino)-4,4'-dioxo-1,1',4,4'-tetrahydro-1,1'-binaphthyliden