Spiro[3H-2,1-benzoxathiole-3,9'-[9H]xanthene]-3',4',5',6'-tetrol, 2',7'-dibromo-, 1,1-dioxide

CAS 16574-43-9

US productionNot reported

Import value, 2024$175M

Top sourceIndia 48%

This chemical is listed as active in US commerce, but no company reported it to EPA’s survey for 2019 or 2023. Sites may have made or imported less than the threshold amount, or none.

Why supply is unknown

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 291479 · basket

These shares come from HS customs code 291479, which covers 95 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).

IN 48%IndiaCN 20%ChinaMX 19%MexicoDE 10%GermanyFI 2%Finland

Ukraine
Japan
Australia
Netherlands
South Korea
Canada
Switzerland
Russia
Poland
Italy
United Kingdom
Spain
Taiwan
Grenada

Why It Matters

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

Vendor Pricing

$24.56/gA2B Chem LLC

CountryUnited States

Pack$614.00 / 25 g

PurityNot recorded

Vendors8 available

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

7 more vendors

Vendor	Country	$/g	Pack	Purity
AA BLOCKS	United States	$25.96	25 g	70%
Aaron Chemicals LLC	Hong Kong	$38.40	5 g	—
Angene International Limited	United States	$39.96	25 g	98%
Angene Chemical	China → Hong Kong	$41.40	5 g	—
Combi-Blocks, Inc.	United States	$47.20	25 g	70%
MedChemExpress MCE	Sweden	$713.90	100 mg	—
Angene	China → Hong Kong	$4266.67	30 mg	—

Chemical Identity

CAS16574-43-9

PubChem CIDNot recorded

DTXSIDDTXSID0066082

FormulaC19H10Br2O8S

Mol. Weight558.15 g/mol

SMILESOC1=C(Br)C=C2C(OC3=C(O)C(O)=C(Br)C=C3C22OS(=O)(=O)C3=CC=CC=C23)=C1O

Data Sources

EPA TSCA InventoryRetrieved 2026-10-04
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

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Brief citations

Spiro[3H-2,1-benzoxathiole-3,9'-[9H]xanthene]-3',4',5',6'-tetrol, 2',7'-dibromo-, 1,1-dioxide (CAS 16574-43-9) https://chemicalindependence.com/chemical/16574-43-9/ EPA TSCA Inventory: CAS 16574-43-9. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 291479 for CAS 16574-43-9. Reporting year: 2024. https://usatrade.census.gov/