quinone :

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  • n  any of a class of aromatic yellow compounds including several that are biologically important as coenzymes or acceptors or vitamins; used in making dyes

  • When oxidized this becomes quinone, which is a direct irritant.
  • Branded with tongue-twisting names like alphatocopherol quinone and pantoyltaurine, the newly discovered substances, present in common foods, have been found to attack vitamins and .
  • To ward off the beetles, Norris is now working to synthesize a quinone-like, nontoxic repellent that can be injected into the tree or sprayed on the bark.

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