Coumarin

coumarin

What it is: A lactone with a sweet smell of hay and almonds.
Why it is used: Sweetness and warmth; the basis of the fougère accord.
Where you usually find it: Tonka beans, sweet clover, cassia; perfumes, cosmetics.
Role in the fragrance: Base note.
Notes in the atlas: Tonka bean, Lavender

What EU law says

Annex III to Regulation (EC) No 1223/2009: its presence must be indicated in the list of ingredients when its concentration exceeds 0.001% in leave-on and 0.01% in rinse-off products. One of the 26 allergens introduced by Directive 2003/15/EC. In detergents it is listed above 0.01% by weight under Regulation (EC) No 648/2004.

In detail: fragrance allergens and the deadlines of Regulation 2023/1545