2,5-Dimethyl-4-oxo-4,5-dihydrofuran-3-yl acetate

CAS 4166-20-5

US productionNot reported

Import value, 2024$64M

Top sourceChina 37%

This chemical is not on EPA’s Toxic Substances Control Act inventory, the list behind EPA’s production survey.

Production is reported production, not a complete census of factories. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 293219 · basket

These shares come from HS customs code 293219, which covers 136 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries

Country of origin for US imports, from Census customs data (2024).

CN 37%ChinaIT 23%ItalyJP 20%JapanIN 12%IndiaES 2%Spain

Belgium
Germany
Netherlands
Canada
Mexico
Slovakia
Malaysia
Portugal
Taiwan
Sweden
Latvia
Israel

Why It Matters

No EPA sector or FDA product records name a use for this chemical.

Chemical Identity

CAS4166-20-5

PubChem CIDNot recorded

DTXSIDDTXSID80863332

FormulaC8H10O4

Mol. Weight170.164 g/mol

SMILESCC1OC(C)=C(OC(C)=O)C1=O

Data Sources

EPA CompTox (DSSTox) · DTXSID80863332Retrieved 2026-04-29
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

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Brief citations

2,5-Dimethyl-4-oxo-4,5-dihydrofuran-3-yl acetate (CAS 4166-20-5) https://chemicalindependence.com/chemical/4166-20-5/ EPA CompTox (DSSTox): 4166-20-5. Retrieved 2026-04-29. https://comptox.epa.gov/dashboard/chemical/details/DTXSID80863332 US Census international trade: HS 293219 for CAS 4166-20-5. Reporting year: 2024. https://usatrade.census.gov/