An antifungal compound produced by grapefruit and Valencia orange after wounding of the peel.

Wounding citrus induces the production of the antifungal compound 1, isolated from peel of injured grapefruit, Citrus paradisa, and injured orange, Citrus sinensis. Interpretation of ms, uv, and 1D and 2D nmr spectroscopic data led to the identification of the new compound as 3-[4-hydroxy,3-(3-methyl-2-butenyl)-phenyl]-2-(E)-propenal.