1,2,3-Tris(3,5-ditert-butyl-4-oxo-2,5-cyclohexadien-1-ylidene)cyclopropane;4,4',4''-(1,2,3-Cyclopropanetriylidene)tris[2,6-bis(1,1-dimethylethyl)-2,5-cyclohexadien-1-one]
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