Falcarinol (1,9-heptadecadiene-4,6-diyn-3-ol) is a natural pesticide and fatty alcohol found in carrots and red ginseng (Panax ginseng), which protects them from fungal diseases, such as liquorice rot that causes black spots on the roots during storage. Falcarinol is a polyyne with two carbon carbon triple bonds and two double bonds. At higher concentrations like in ivy, falcarinol is capable to induce a allergic reaction (contact dermatitis).
See the BBC article: Carrots may help ward off cancer
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