4-Aminobenzenesulfonic acid

CAS 121-57-3

Used in 4 industrial sectors tracked by the EPA.

US production7.3M lb

Import volumeZero

Import dependency0%

Top sourceNo public record

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 292142 · basket

EPA reports by year

2023: US production 7.3M lb · Imports Zero
2019: US production Confidential · Imports Zero

HS customs code 292142 covers 67 tracked chemicals in total. US Census does not break out this chemical's share, so the country-of-origin mix is not available. EPA CDR reports import dependency at the chemical level separately, shown above.

EPA-registered manufacturers (1)

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

Nation Ford Chemical

Why It Matters

Sectors

HealthFoodConstructionPaper & 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 4 sectors as 3 functional roles.

•Plasticizer in Construction (15%)Processing as a reactant
•Brightener in Paper Manufacturing (22%)Processing as a reactant
•Intermediate in Pharmaceutical and Medicine Manufacturing (37%)Processing as a reactant
•Intermediate in Food, beverage, and tobacco product manufacturing (26%)Processing as a reactant

Vendor Pricing

$0.06/gA2B Chem LLC

CountryUnited States

Pack$29.00 / 500 g

Purity99%

Vendors20 available

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

19 more vendors

Vendor	Country	$/g	Pack	Purity
AA BLOCKS	United States	$0.07	500 g	99%
ALFA AESAR	Germany	$0.09	5 kg	98%
Cayman Europe	Estonia	$0.18	500 g	95%
AK Scientific Specialized	United States	$0.19	500 g	95%
Combi-Blocks, Inc.	United States	$0.25	1 kg	98%
AK Scientific, Inc.	United States	$0.26	500 g	98%
Sigma-Aldrich (Rush Stock)	Germany	$0.51	500 g	99%
Sigma-Aldrich	Germany	$0.51	500 g	99%
Fluorochem UK	United Kingdom	$0.54	100 g	95%
MedKoo Biosciences, Inc	United States	$1.44	500 g	98%
Interbioscreen	Hong Kong	$5.00	10 g	95%
HTS Biochemie Innovationen	Germany	$170.00	5 g	95%
Labotest KG	Germany	$217.80	5000 mg	90%
Vitas M Chemical Limited	Hong Kong	$360.00	1 g	90%
Otava, Ltd.	Ukraine	$2280.00	50 mg	95%
Otava, Ltd. (2 weeks)	Ukraine	$2724.00	50 mg	95%
Life Chemicals Inc.	Ukraine → Canada	$3100.00	100 mg	90%
Princeton BioMolecular Research (SC)	United States	$4200.00	50 mg	90%
ChemDiv, Inc.	United States	$7666.67	15 mg	90%

Chemical Identity

CAS121-57-3

PubChem CID8479

DTXSIDDTXSID6024464

FormulaC6H7NO3S

Mol. Weight173.19 g/mol

SMILESC1=CC(=CC=C1N)S(=O)(=O)O

Data Sources

EPA CompTox (DSSTox) · DTXSID6024464Retrieved 2026-04-06
PubChem · compound 8479Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04

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Brief citations

4-Aminobenzenesulfonic acid (CAS 121-57-3) https://chemicalindependence.com/chemical/121-57-3/ EPA CompTox (DSSTox): DTXSID6024464. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID6024464 PubChem: 8479. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/8479 EPA Chemical Data Reporting: 121-57-3. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 121-57-3. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting