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2-Butenethioic acid, 3-methyl-, S-(1-methylpropyl) ester

CAS 34322-09-3

2-Butenethioic acid, 3-methyl-, S-(1-methylpropyl) ester chemical structure

Concern score

Not assessed — no hazard data yet.

2-Butenethioic acid, 3-methyl-, S-(1-methylpropyl) ester in plain language

What it is

On cosmetic ingredient lists it appears as “Tert-butyl ISOPENT-2-ENTHIOATE”.

Also known as Tert-butyl ISOPENT-2-ENTHIOATE · S-sec-butyl 3-METHYLBUT-2-ENETHIOATE · S-Butan-2-yl 3-methylbut-2-enethioate · 3-Methylthiocrotonic acid, S-sec-butyl ester · AKOS006271519 · Crotonic acid, 3-methylthio-, S-sec-butyl ester

Show all 17 names

Gggwoxlorxhxfz-uhfffaoysa-n · Q27273956 · S-(1-Methylpropyl) 3-methylbut-2-enethioate · S-s-butyl 3-methylbut-2-enethioate · S-sec-Butyl 3-methyl-2-butenethioate · UNII-AJD6235QYA · sec-Butyl S-senecthioate · sec-Butyl-3-methylbut-2-ene thioate · sec-butyl 3-methyl-2-butenethioate · sec-butyl-3-methyl but-2-ene thioate · tert-Butyl 3-methyl-2-butenethioate

What it does

Used in cosmetics as a fragrance ingredient.

  • Perfuming
  • Fragrance
Is it a concern?
We haven't assessed a concern score for this ingredient yet. It is listed for cosmetic use in the EU.

Regulation

No restrictions found. 2-Butenethioic acid, 3-methyl-, S-(1-methylpropyl) ester appears in these published regulatory listings.

Recorded in these product areas

  • Found in consumer products
  • Industrial
  • EUCosIngActiveListed in CosIng inventory for cosmetic use.
    • Listed in CosIng inventory for cosmetic use.Source →
  • 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-Butenethioic acid, 3-methyl-, S-(1-methylpropyl) ester. 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-Butenethioic acid, 3-methyl-, S-(1-methylpropyl) ester yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.

6 data sources

Where this comes from

  • CosIng

    regulatory · updated 2026-09-23

    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

    Open →

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.

Avoid

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-Butenethioic acid, 3-methyl-, S-(1-methylpropyl) ester in a product composition. These are source records, not Greenveil catalog products.

Named organisations

3

Typical roles

PerfumingFragrance
See products using 2-Butenethioic acid, 3-methyl-, S-(1-methylpropyl) ester →