1,3-Isobenzofurandione, 3a,4,7,7a-tetrahydro-4-methyl-

CAS 5333-84-6

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$37M

Top sourceChina 25%

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 291720 · basket

EPA reports by year

2023: US production Confidential · Imports Confidential

These shares come from HS customs code 291720, which covers 42 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 25%ChinaIT 21%ItalyJP 21%JapanDE 14%GermanyIN 9%India

Ukraine
South Africa
Malaysia
Netherlands
Mexico
United Kingdom
Switzerland
Latvia
Canada

Why It Matters

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

Vendor Pricing

$0.25/gCombi-Blocks, Inc.

CountryUnited States

Pack$250.00 / 1 kg

Purity95%

Vendors8 available

Prices reflect listed pack sizes. Small research packs run far above bulk rates.

7 more vendors

Vendor	Country	$/g	Pack	Purity
AstaTech, Inc	United States	$4.40	10 g	95%
A2B Chem LLC	United States	$9.60	5 g	95%
AA BLOCKS	United States	$10.20	5 g	95%
Aaron Chemicals LLC	Hong Kong	$16.40	5 g	95%
Angene Chemical	China → Hong Kong	$17.00	5 g	95%
Angene International Limited	United States	$21.40	5 g	95%
Angene	China → Hong Kong	$4266.67	30 mg	95%

Chemical Identity

CAS5333-84-6

PubChem CIDNot recorded

DTXSIDDTXSID6058710

FormulaC9H10O3

Mol. Weight166.176 g/mol

SMILESCC1C=CCC2C1C(=O)OC2=O

Data Sources

EPA TSCA InventoryRetrieved 2026-04-29
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

1,3-Isobenzofurandione, 3a,4,7,7a-tetrahydro-4-methyl- (CAS 5333-84-6) https://chemicalindependence.com/chemical/5333-84-6/ EPA TSCA Inventory: CAS 5333-84-6. Retrieved 2026-04-29. https://www.epa.gov/tsca-inventory EPA Chemical Data Reporting: 5333-84-6. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 291720 for CAS 5333-84-6. Reporting year: 2024. https://usatrade.census.gov/