Irones are a group of methylionone odorants used in perfumery, derived from iris oil,Council of Europe, August 2007 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.
See also Ionone
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Structure - Odor Relationships