- beauty
- industrial
2-Pentyl-2-cyclopenten-1-one
CAS 25564-22-1 · 70/100 · High conf.
Concern score
70/100High concern based on regulatory listings.
High confidence
2-Pentyl-2-cyclopenten-1-one in plain language
On cosmetic ingredient lists it appears as “Amylcyclopentenone”.
Also known as Amylcyclopentenone · 2-CYCLOPENTEN-1-ONE, 2-PENTYL- · Amylcyclopentenone; 2-Pentylcyclopent-2-en-1-one · 2-Pentylcyclopent-2-en-1-one · 2-Pentyl-2-Cyclopentene-1-One · 2-Pentyl-cyclopent-2-enone
Show all 17 names
2-pentyl-2-cyclopentenone · 2-pentyl-cyclopent-2-en-1-one · 2-pentylcyclopent-2-enone · 2Cyclopenten1one, 2pentyl · 2Pentylcyclopent2en1one · 4-07-00-00195 (Beilstein Handbook Reference) · Amyl cyclopentenone · CAS-25564-22-1 · Ec 247-104-4 · Ilhzvkaxfcdfmt-uhfffaoysa-n · UNII-1UOK9N9N72
Used in cosmetics as a fragrance ingredient.
- Perfuming
- Fragrance
- High concern: no hazard classifications on record. It is restricted in EU cosmetics.
Why it's flagged
Amylcyclopentenone; 2-Pentylcyclopent-2-en-1-one is restricted in cosmetic products under Annex III of the EU Cosmetics Regulation (EC) 1223/2009.
RestrictedEU EC — restricted
The score describes this ingredient's chemical identity — its hazard profile from published classifications and regulatory status — not the safety of any product it appears in.
Regulation
Restrictions first, then routine listings from published regulatory sources.
- EU Annex III — restricted
- EU restricted in cosmetics
- Found in consumer products
- Industrial
- View source →restricted
EUEC
Annex III of EU Cosmetics Regulation (EC) 1223/2009: substances which cosmetic products must not contain except subject to the restrictions laid down. Maximum concentration: 0.1%
USEPAcommercial use observedEPA CPDat observed this chemical in 0 composition records across product categories including unclassified products. EPA CPDat classifies this chemical for functional uses including Fragrance.
- EPA CPDat observed this chemical in 0 composition records across product categories including unclassified products. EPA CPDat classifies this chemical for functional uses including Fragrance.Source →
USFDAlisted in openFDA substanceopenFDA substance registry classifies this ingredient as chemical.
- openFDA substance registry classifies this ingredient as chemical.Source →
Expert safety opinions
No expert opinion on file for 2-Pentyl-2-cyclopenten-1-one. These are the independent scientific bodies that assess ingredients like this one; we show an opinion only when a record we hold cites it.
SCCS
EU Scientific Committee on Consumer Safety
No SCCS opinion on file.
CIR
Cosmetic Ingredient Review (US expert panel)
No CIR safety assessment on file.
Evidence & sources
No graded research studies for 2-Pentyl-2-cyclopenten-1-one yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.
Where this comes from
- Open →
CosIng
regulatory · updated 2026-09-23
- Open →
EU CosIng Cosmetics Regulation Annexes
regulatory · updated 2013-05-17
- Open →
EPA Chemical and Products Database
exposure · updated 2022-06-22
- Open →
EPA DSSTox Identifiers
chemistry · updated 2025-12-29
- Open →
FDA GSRS UNII
registry · updated 2026-02-26
- Open →
openFDA Substance
registry · updated 2026-05-24
- Open →
PubChem Live Enrichment
chemistry · updated 2026-05-17
Reference links (1)
Suitability
Context-specific fit derived from published classifications and the current ingredient evidence profile.
Fragrance avoidance
Not a strong fit for fragrance avoidance because it carries Fragrance.
The ingredient itself is a fragrance-linked signal, so it is better treated as an avoid case when fragrance exposure is the main concern.
Where it has been recorded
How often EPA CPDat has listed 2-Pentyl-2-cyclopenten-1-one in a product composition. These are source records, not Greenveil catalog products.
Named organisations
2
Typical roles
PerfumingFragrance