ionone

noun
io·​none | \ˈī-ə-ˌnōn \

Medical Definition of ionone 

: either of two oily liquid isomeric ketones C13H20O that have a strong odor of violets, are found especially in the essential oil of an Australian shrub (Boronia megastigma) but are usually obtained from citral, and are used especially in perfumes

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