cyclohexa-3,5-diene-1,2-dione 1,2-Benzoquinone o-Benzoquinone 20526-43-6 583-63-1 benzo-1,2-quinone C02351 2-Benzoquinone 3,5-Cyclohexadiene-1,2-dione (9CI) 4-07-00-02063 (Beilstein Handbook Reference) BRN 2038185 ORTHO-BENZOQUINONE o-Quinone InChI=1/C6H4O2/c7-5-3-1-2-4-6(5)8/h1-4 3,5-cyclohexadiene-1,2-dione CHEBI:17253