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CAS 16957-70-3 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 4076502/03/2011

TRANS-2-METHYLPENT-2-ENOIC ACID

(E)-2-Methylpent-2-en-1-oic acid

TRANS-2-METHYLPENT-2-ENOIC ACID 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.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 16957-70-3

CAS 16957-70-3PubChem CID 5365909

2-Methyl-2-pentenoic acid

2-Methyl-2-pentenoic acid is a methyl-branched fatty acid. It is a conjugate acid of a 2-methyl-(2E)-pentenoate(1-). — ChEBI

IUPAC name: (E)-2-methylpent-2-enoic acid

Molecular formula: C6H10O2
Molecular weight: 114.14 g/mol
Exact mass: 114.068079557 Da
XLogP3: 1.4
Topological polar surface area: 37.3 Å²
Hydrogen-bond donors: 1
Hydrogen-bond acceptors: 2
Covalent units: 1
Defined stereocentres: 0

Also known as

trans-2-Methyl-2-pentenoic acid3142-72-1(E)-2-methyl-2-pentenoic acid(2E)-2-methylpent-2-enoic acidFEMA No. 31952-Pentenoic acid, 2-methyl-, (E)-2-Pentenoic acid, 2-methyl-, (2E)-2-Pentenoic acid, 2-methyl-

16 more reported names

44I99E898B(E)-2-Methylpent-2-en-1-oic acid2-Pentene-2-carboxylicacid(2E)-2-Methyl-2-pentenoic acidStrawberry acidUNII-44I99E898B(2E)-2-Methyl-2-pentenoic Acid; (E)-2-Methyl-2-pentenoic Acid; (2E)-2-Methylpent-2-enoic AcidEINECS 221-552-0EINECS 241-026-4(E)-2-methylpent-2-enoicacidJJYWRQLLQAKNAD-SNAWJCMRSA-CHEBI:173385trans-2-methyl-pent-2-enoic acidtrans-2-Methyl-2-pentenoic acid, 97%2-METHYL-2-PENTENOIC ACID [FCC]LS-13152

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External database identifiers

ChEBI:CHEBI:173385
ChEMBL:CHEMBL116268
EPA DTXSID:DTXSID30884951

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 TRANS-2-METHYLPENT-2-ENOIC ACID

INCI name

TRANS-2-METHYLPENT-2-ENOIC ACID

Description

(E)-2-Methylpent-2-en-1-oic acid

Record provenance

Inventory reference: 40765
Imported identity: TRANS-2-METHYLPENT-2-ENOIC ACID
Source update: 02/03/2011

European Commission CosIng source notes

Annex records for TRANS-2-METHYLPENT-2-ENOIC ACID

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Key data

CAS

16957-70-3

241-026-4

Restriction

—

Function

PERFUMING: Used for perfume and aromatic raw materials.

Ingredients with overlapping formulation functions

TRANS-2-HEXENYL PROPIONATEPERFUMING

TRANS-2-HEXENYL SALICYLATEPERFUMING

TRANS-2-HEXENYL VALERATEPERFUMING

TRANS-2-METHYL-4-PROPYL-1,3-OXATHIANEPERFUMING

TRANS-2-OCTENALPERFUMING

TRANS-2-PHENYLPROPENYL ACETATEPERFUMING

TRANS-2-TERT-BUTYLCYCLOHEXANOLPERFUMING

TRANS-2-UNDECENALPERFUMING

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 TRANS-2-METHYLPENT-2-ENOIC ACID appears in the CosIng inventory

The CosIng inventory lists TRANS-2-METHYLPENT-2-ENOIC ACID 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.

TRANS-2-METHYLPENT-2-ENOIC ACID 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

TRANS-2-METHYLPENT-2-ENOIC ACID 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, TRANS-2-METHYLPENT-2-ENOIC ACID carries the following function designation(s):

PERFUMING

CAS 16957-70-3 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 TRANS-2-METHYLPENT-2-ENOIC ACID

This page reproduces the CosIng inventory entry for TRANS-2-METHYLPENT-2-ENOIC ACID 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 TRANS-2-METHYLPENT-2-ENOIC ACID 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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