1H-Indene-1,3(2H)-dione, 2-(bis(3,5-bis(1,1-dimethylethyl)-4-oxo-2,5-cyclohexadien-1-ylidene)cyclopropylidene)- 2-(Bis(3,5-bis(1,1-dimethylethyl)-4-oxo-2,5-cyclohexadien-1-ylidene)cyclopropylidene)-1H-indene-1,3(2H)-dione 63165-94-6