5,10-Dihydro-11-oxa-11H-benzo[b]fluorene-5,10-dione;6,11-Dihydrobenzo[b]naphtho[2,3-d]furan-6,11-dione;Benzo[b]naphtho[2,3-d]furan-6,11-dione;β-Brazanquinone
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