Synonyms: 4,4′-DIPHENOQUINONE (DQ);(bi-2,5-cyclohexadien-1-ylidene)-4,4’-dione;[Bi-2,5-cyclohexadien-1-ylidene]-4,4'-dione;4-(4-oxo-2,5-cyclohexadien-1-ylidene)-5-cyclohexadien-1-one;4,4’-biphenyldione;4-(4-Oxo-2,5-cyclohexadien-1-ylidene)-2,5-cyclohexadien-1-one;Δ4,4'-Bi[2,5-cyclohexadiene-1-one]