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    Bergapten (5-methoxypsoralen) is a psoralen (also known as furocoumarins) found in bergamot essential oil, in other citrusessential oils, and in grapefruit juice. It is the chemical in bergamot oil that causes phototoxicity. Bergapten-free bergamot essential oil or synthetics are now used in perfumery.

    A known use of bergapten is in the synthesis of Fraxinol.

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    Other names

    4-Methoxy-7H-furo[3,2-g]chromen-7-one (IUPAC Name); 5-Methoxypsoralen; Heraclin