2-Butenoic acid, 4,4'-[(dibutylstannylene)bis(oxy)]bis[4-oxo-, diisooctyl ester, (2Z,2'Z)-

CAS 25168-21-2

U.S. production volumes are classified as confidential business information.

US productionCBI

Confidential Business Information. The EPA withholds this volume because publishing it could reveal the reporting company's trade secrets.

Import value, 2024$537M

Top sourceChina 39%

At least one company claimed its 2023 production or import volume for this chemical as confidential, so EPA withholds it.

Why supply is unknown

Production is reported production, not a complete census of factories. US production volume is confidential. Production reporting year: 2023. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 293190 · basket

EPA reports by year

2023: US production Confidential · Imports Confidential
2019: US production Confidential · Imports Zero

These shares come from HS customs code 293190, which covers 378 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 39%ChinaDE 17%GermanyIT 9%ItalyIN 7%IndiaJP 7%Japan

Ireland
Netherlands
Switzerland
Monaco
Ukraine
Spain
Mexico
Poland
Indonesia
Armenia
Israel
Sweden
Australia
Czech Republic
Hungary
Brunei
Hong Kong
Brazil
Thailand
Argentina
Finland
Austria
Latvia

Domestic parents -- activity not disclosed (2)

EPA records name a US company for this chemical but do not disclose whether the company made it here or imported it.

Milliken &

Polymer Additves

Why It Matters

Sectors

Plastics & Rubber

Downstream UsesNot recorded

FDA Shortage Status

Whether any manufacturer currently reports this drug as in shortage on the FDA Drug Shortages database. "Active Shortage" means at least one presentation has status "current."

No FDA shortage records

Industrial Uses

•Heat stabilizer in Plastics Product ManufacturingProcessing—incorporation into article

Chemical Identity

CAS25168-21-2

PubChem CID16684059

DTXSIDDTXSID9067063

FormulaC32H56O8Sn

Mol. Weight687.5 g/mol

SMILESCCCC[Sn](CCCC)(OC(=O)C=CC(=O)OCCCCCC(C)C)OC(=O)C=CC(=O)OCCCCCC(C)C

Data Sources

EPA CompTox (DSSTox) · DTXSID9067063Retrieved 2026-04-06
PubChem · compound 16684059Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

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Brief citations

2-Butenoic acid, 4,4'-[(dibutylstannylene)bis(oxy)]bis[4-oxo-, diisooctyl ester, (2Z,2'Z)- (CAS 25168-21-2) https://chemicalindependence.com/chemical/25168-21-2/ EPA CompTox (DSSTox): DTXSID9067063. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID9067063 PubChem: 16684059. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/16684059 EPA Chemical Data Reporting: 25168-21-2. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 25168-21-2. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 293190 for CAS 25168-21-2. Reporting year: 2024. https://usatrade.census.gov/