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Quinoid comes from the compound quinone: ( the -oid suffix means: 'looks like' or 'derived from')
A quinone is a class of organic compounds that are formally derived from aromatic compounds (such as benzene or naphthalene) by exchanging two --CH= groups by --C(=O)-- groups in the aromatic (cyclic benzene) structure, resulting in a fully conjugated cyclic (C6H4) dione (O= .. =O) structure.
So:
O=(C6H4)=O
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