Tetramethyl Acetyloctahydronaphthalenes
Tetramethyl acetyloctahydronaphthalenes (OTNE)
- Role
- A synthetic scent molecule used in fragrances.
- Catalog formulas
- 13
- Type
- Scent
- Verified
- 06.11.2026
What does this ingredient do in an antiperspirant?
Contributes to the scent of the blend. The plural name reflects that one INCI name covers several closely related isomers (the EU entry lists four CAS numbers).
Part of a system, not a label in isolation
In an antiperspirant or deodorant it only contributes to the scent and does not reduce sweating. Its presence in the list means the product is fragranced.
EU Regulation 2023/1545 added it to the list of fragrance allergens (Annex III, entry 344): above 0.001% in leave-on and 0.01% in rinse-off products it must be named separately in the ingredient list. New products must comply from 31 July 2026; products already on the market may be sold until 31 July 2028.
The 2012 SCCS opinion lists it as an established contact allergen in humans, with up to 10 positive patch-test reactions reported.
This is one specific substance. Parfum is the umbrella name for the whole fragrance blend, whereas the EU requires this component to be named separately.
Products containing Tetramethyl Acetyloctahydronaphthalenes
Links are based on the complete published INCI list for the exact product version.
Sources
The conclusions apply to the stated conditions and jurisdictions, not automatically to every concentration or product.
- CosIng Checker: Annex III, entry 344 (Tetramethyl acetyloctahydronaphthalenes) Supports: restrictions, allergen labelling
- European Commission: fragrance allergens Supports: allergen labelling, Regulation 2023/1545 deadlines
- SCCS/1459/11: Opinion on fragrance allergens in cosmetic products Supports: allergenicity assessment