Organic compounds containing a quinone ring with substituents attached at the para position.
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2,3-bis(2-hydroxy-4,4-dimethyl-6-oxocyclohex-1-enyl)cyclohexa-2,5-diene-1,4-dione
1,2-Benzisoxazole-4,7-dione, 3-(2,4,6-trimethylphenyl)-
