1,4-benzoquine 1,4-benzoquinone 1,4-cyclohexadienedione 1,4-dioxybenzene 106-51-4 2,5-cyclohexadiene-1,4-dione Benzoquinone Chinone Cyclohexadiene-1,4-dione InChI=1/C6H4O2/c7-5-1-2-6(8)4-3-5/h1-4 Quinone1,4-Benzoquinone Steara PBQ benzo-1,4-quinone cyclohexadienedione p-benzoquinone para-Quinone quinone