benzoquinone /ben·zo·qui·none/ (-kwin´ōn)
1. a substituted benzene ring containing two carbonyl groups, usually in the para (1,4) position; p- benzoquinone is used in manufacturing and in fungicides and is toxic by inhalation and an irritant to skin and mucous membranes.
2. any of a subclass of quinones derived from or containing this structure. 
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