4,4'-Diamino-2,2'-stilbenedisulfonic acid

CAS 81-11-8

EPA’s 2023 records show zero U.S. production of this chemical.

US productionZero

Import value, 2024$84M

Import volumeCBI

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

Top sourceJapan 31%

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. 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 292159 · basket

EPA reports by year

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

These shares come from HS customs code 292159, which covers 51 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).

JP 31%JapanIN 26%IndiaCN 21%ChinaCH 13%SwitzerlandBE 4%Belgium

United Kingdom
South Korea
Canada
Italy
Ukraine
Netherlands

EPA-registered importers (3)

Companies that report making or importing this chemical to the EPA. Registration is US-centric and does not indicate import origin.

Archroma Management Gmbh · CH Switzerland

Archroma U.S

Liberty Specialty Chemicals

Why It Matters

Sectors

TextilesPaper & Printing

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

Used in 2 sectors as 2 functional roles.

•Intermediate in Synthetic Dye and Pigment Manufacturing (100%)Processing as a reactant
•Brightener in Paper ManufacturingProcessing as a reactant
•Brightener in Synthetic Dye and Pigment ManufacturingProcessing as a reactant

Vendor Pricing

$5.00/gFulfilled by Molport

CountryLatvia

Pack$125.00 / 25 g

Purity95%

Vendors1 available

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

Chemical Identity

CAS81-11-8

PubChem CID6668

DTXSIDDTXSID5024926

FormulaC14H14N2O6S2

Mol. Weight370.4 g/mol

SMILESC1=CC(=C(C=C1N)S(=O)(=O)O)C=CC2=C(C=C(C=C2)N)S(=O)(=O)O

Data Sources

EPA CompTox (DSSTox) · DTXSID5024926Retrieved 2026-04-06
PubChem · compound 6668Retrieved 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

4,4'-Diamino-2,2'-stilbenedisulfonic acid (CAS 81-11-8) https://chemicalindependence.com/chemical/81-11-8/ EPA CompTox (DSSTox): DTXSID5024926. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID5024926 PubChem: 6668. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/6668 EPA Chemical Data Reporting: 81-11-8. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 81-11-8. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 292159 for CAS 81-11-8. Reporting year: 2024. https://usatrade.census.gov/