The Quinone reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Quinone

Quinone (benzoquinone) refers to either of two cyclic isomers with chemical formula C₆H₄O₂: orthobenzoquinone and parabenzoquinone.

orthobenzoquinone

parabenzoquinone

The word quinone can also be used for a family of molecules having a cycle with two double bonds similar to benzoquinone.

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