Fragrance allergens / 3-Propylidenephthalide
3-Propylidenephthalide
3-Propylidenephthalide must be declared in the EU and Northern Ireland, but it is NOT on the Great Britain list: GB retains the older, shorter list and has not adopted Reg (EU) 2023/1545.
Identity
| Name in the ingredient list | 3-Propylidenephthalide |
|---|---|
| CAS / EC number | 17369-59-4 / EC 241-402-8 |
| EU Annex III entry | 175 |
It predates the 2023 expansion; Reg (EU) 2023/1545 amended its entry (typically regrouping the covered isomer forms).
When it must appear on the label
3-Propylidenephthalide may be present as a constituent of essential oils or fragrance compounds. It must be named individually in the ingredient list when its total concentration in the finished product exceeds 0.001% in leave-on products (lotions, balms) or 0.01% in rinse-off products (soap, shower gel), summed across every fragrance source in the recipe. Below the threshold it stays within the collective term "Parfum".
United States: no individual fragrance-allergen labelling is in force yet (MoCRA rulemaking pending); fragrance is declared collectively as "Fragrance".
Common questions
Do I have to list 3-Propylidenephthalide on my label?
3-Propylidenephthalide must be declared in the EU and Northern Ireland, but it is NOT on the Great Britain list: GB retains the older, shorter list and has not adopted Reg (EU) 2023/1545. It must be named individually once it exceeds 0.001% of a leave-on product or 0.01% of a rinse-off product, summed across every fragrance source in the recipe. Below that it stays inside the collective term "Parfum".
What is the CAS number for 3-Propylidenephthalide?
3-Propylidenephthalide is listed under CAS 17369-59-4 (EC 241-402-8), Annex III entry 175.
Sources
- Commission Regulation (EU) 2023/1545 (OJ L 188, 27.7.2023), as corrected by the corrigendum of 11.11.2025, Annex (EUR-Lex)
Transcribed from the official texts linked above and source-audited against them; a labelling reference, not safety advice. You remain responsible for your product's compliance.
Rule tables last checked 21 August 2026.