Melonal

Say itMEL-uh-nal

Green melon, cucumber peel, watermelon skin, wet air.

What it is: A molecule made in a lab.
When you smell it: Top notes: the first minutes.
What perfumers do with it: Juicy melon freshness in tiny doses; brightens citrus and adds a wet, dewy edge
Worth knowing: Supplier data puts its average dose below 0.1% of a perfume concentrate, yet it still shows.
Known in: Carnal Flower (Frédéric Malle, 2005); J'adore (Dior, 1999)
Also called: melon aldehyde; 2,6-dimethyl-5-heptenal

Not on the label of any of the 232 perfumes read so far.

Sources