Aldehyde C-8

Say itAL-dih-hyde see-AYT

Sharp orange-peel zest with a fatty, waxy, metallic aldehydic edge.

What it is: A molecule made in a lab.
Where it comes from: occurs in orange and bergamot peel
When you smell it: Top notes: when you spray it.
What perfumers do with it: Boosts citrus top notes and adds aldehydic sparkle to floral-aldehydic openings.
Also called: Octanal; caprylic aldehyde

Not on the label of any of the 1080 perfumes read so far.

Sources