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Irones are a group of methylionone odorants used in perfumery, derived from iris oil,[1] e.g. orris root. The most commercially important of these are:

  • (-)-cis-γ-irone, and
  • (-)-cis-α-irone

Irones form through slow oxidation of triterpenoids in dried rhizomes of the iris species, Iris pallida. Irones typically have a sweet floral, iris, woody, ionone, odor.


  1. ^ Council of Europe, August 2007 Natural Sources of Flavourings, Volume 2, p. 103, at Google Books