3,4-Bis(3,5-ditert-butyl-4-oxo-2,5-cyclohexadien-1-ylidene)cyclobutane-1,2-dione

3,4-Bis[3,5-bis(1,1-dimethylethyl)-4-oxo-2,5-cyclohexadien-1-ylidene]-1,2-cyclobutanedione