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CAS 80-71-7 may appear across multiple EU annex records. The CAS lookup page shows all Annex II–VI entries sharing this identifier, useful for identifying cross-annex regulatory status of the same chemical substance.

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InventoryRef 4065502/03/2011

METHYLCYCLOPENTENOLONE

2-Hydroxy-3-methylcyclopent-2-enone

METHYLCYCLOPENTENOLONE is listed in the EU CosIng inventory, but no direct annex records are linked on this page yet.

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Regulatory evidence by market

No rule for this ingredient has been imported for any of the 13 markets tracked here.

That describes this inventory, not the law. No imported rule is not evidence that an ingredient is permitted: a rule may exist under another name or identifier, or in a dataset not yet imported here.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 80-71-7

CAS 80-71-7PubChem CID 6660

2-Hydroxy-3-methyl-2-cyclopenten-1-one

Cyclotene is a metabolite found in or produced by Saccharomyces cerevisiae. — Yeast Metabolome Database (YMDB)

IUPAC name: 2-hydroxy-3-methylcyclopent-2-en-1-one

Molecular formula: C6H8O2
Molecular weight: 112.13 g/mol
Exact mass: 112.052429494 Da
XLogP3: 0.3
Topological polar surface area: 37.3 Å²
Hydrogen-bond donors: 1
Hydrogen-bond acceptors: 2
Covalent units: 1
Defined stereocentres: 0

Also known as

CycloteneCoryloneCycloten2-Cyclopenten-1-one, 2-hydroxy-3-methyl-MethylcyclopentenoloneCyclotene (ordorant)2-Hydroxy-1-methylcyclopenten-3-oneNSC-133445

16 more reported names

627E92X64BFEMA No. 2700RefChem:581283201-303-22-Hydroxy-3-methylcyclopent-2-enoneCorylonMaple lactone2-Hydroxy-3-methyl-2-cyclopentenone3-Methyl-2-hydroxy-2-cyclopentenone3-Methylcyclopent-2-en-2-ol-1-one3-Methyl-2-cyclopentene-2-ol-1-oneEPA Pesticide Chemical Code 004049NSC 1334452-hydroxy-3-methyl-cyclopent-2-en-1-one3-methyl-2-cyclopenten-2-ol-1-oneCCRIS 2940

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

EPA DTXSID:DTXSID4035128

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Inventory details for METHYLCYCLOPENTENOLONE

INCI name

METHYLCYCLOPENTENOLONE

Description

2-Hydroxy-3-methylcyclopent-2-enone

Record provenance

Inventory reference: 40655
Imported identity: METHYLCYCLOPENTENOLONE
Source update: 02/03/2011

European Commission CosIng source notes

Annex records for METHYLCYCLOPENTENOLONE

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Key data

CAS

80-71-7

201-303-2

Restriction

—

Function

PERFUMING: Used for perfume and aromatic raw materials.

Ingredients with overlapping formulation functions

METHYLCYCLOHEXENYL BUTANOLFRAGRANCE, PERFUMING

METHYLCYCLOHEXENYL-BUTENYL ACETATEPERFUMING

METHYLCYCLOHEXENYLPROPYL-CYCLOPENTANONEPERFUMING

METHYLCYCLOPENTADECANONEPERFUMING

METHYLCYCLOTRIDECANONEPERFUMING

METHYLENEDIOXYPHENYL METHYLPROPANALPERFUMING

METHYLFURFURALPERFUMING

METHYLHEPTADIENONEPERFUMING

Additional official and scientific sources

11 external databases to check this identity in

Each link searches that source for this identity. What each source is, and its legal weight

ECHA CHEM / Information on chemicals PubChem PUG REST EU Safety Gate cosmetic product alerts ECHA CHEM US EPA CompTox Cosmetic Ingredient Review safety assessments FDA Global Substance Registration System ILO/WHO International Chemical Safety Cards Japan NITE-CHRIP NIOSH Pocket Guide to Chemical Hazards OECD eChemPortal

How METHYLCYCLOPENTENOLONE appears in the CosIng inventory

The CosIng inventory lists METHYLCYCLOPENTENOLONE as a cosmetic ingredient and this page links it to 0 annex records. The inventory entry captures names and identifiers, while the annex records show where the substance is prohibited, restricted or positively listed in EU cosmetics law.

METHYLCYCLOPENTENOLONE is also tagged with 1 cosmetic function in the official data. Function labels describe intended use, but they do not replace regulatory review of linked annex records before formulation or labelling work.

Frequently asked questions

METHYLCYCLOPENTENOLONE is listed in the EU CosIng ingredient inventory with no direct annex restriction records linked at this time. Absence of an annex link does not guarantee unrestricted use — always verify against the current official CosIng database before formulating.

According to the EU CosIng inventory, METHYLCYCLOPENTENOLONE carries the following function designation(s):

PERFUMING

CAS 80-71-7 may appear across multiple EU annex records. Viewing the CAS lookup page shows all Annex II–VI entries sharing this identifier, which is useful for identifying cross-annex regulatory status of the same chemical substance.

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Source note for METHYLCYCLOPENTENOLONE

This page reproduces the CosIng inventory entry for METHYLCYCLOPENTENOLONE from public European Commission cosmetic ingredient materials and shows linked identifiers even when no direct annex match is currently attached.

Use this inventory page to research METHYLCYCLOPENTENOLONE and compare linked records, but verify restrictions and legal status against the current official source text and law before making regulatory decisions.

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