2,4-Bis(3,5-ditert-butyl-4-oxo-2,5-cyclohexadien-1-ylidene)cyclobutane-1,3-dione;2,4-Bis[3,5-bis(1,1-dimethylethyl)-4-oxo-2,5-cyclohexadien-1-ylidene]-1,3-cyclobutanedione
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