Bergapten (5-methoxypsoralen) is a psoralen (also known as furocoumarins) found in bergamot essential oil and many other citrus essential oils, and is the chemical in bergamot oil that causes phototoxicity.

Bergapten
| Description | |
|---|---|
| 4-methoxy-7H-furo[3,2-g]chromen-7-one | |
| 484-20-8 | |
| C12H8O4 | |
| 5-MOP;4-MOP;MAJUDIN;Geralen;HERACLIN;Bergaptan;Psoraderm;BERGAPTEN; Bergaptene; AKOS 201-13 | |
| A psoralen phytotoxic citrus essential oil found in bergamont | |