2-Naphthalenesulfonic acid, 7,7'-(carbonyldiimino)bis[4-hydroxy-

CAS 134-47-4

Used in 1 industrial sector tracked by the EPA.

US productionNot reported

Import value, 2024$28M

Top sourceIsrael 32%

EPA lists this chemical for 2023 but publishes zero or no volume for both production and imports.

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 292421 · basket

EPA reports by year

2023: US production Not published · Imports Not published

These shares come from HS customs code 292421, which covers 26 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).

IL 32%IsraelCN 19%ChinaCH 11%SwitzerlandIN 11%IndiaDE 9%Germany

South Korea
Spain
Singapore
Ukraine
Italy
Poland
Hong Kong

Domestic parents -- activity not disclosed (1)

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

Aceto Us

Why It Matters

Sectors

Textiles

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

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

Vendor Pricing

$1.18/gAaron Chemicals LLC

CountryHong Kong

Pack$589.00 / 500 g

Purity95%

Vendors12 available

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

11 more vendors

Vendor	Country	$/g	Pack	Purity
Angene Chemical	China → Hong Kong	$1.19	500 g	95%
A2B Chem LLC	United States	$1.57	500 g	95%
AA BLOCKS	United States	$2.06	500 g	95%
Combi-Blocks, Inc.	United States	$2.40	100 g	98%
AK Scientific Specialized	United States	$2.40	100 g	95%
AK Scientific, Inc.	United States	$3.29	100 g	97%
TargetMol Chemicals	China → United States	$293.00	1 g	99.85%
Angene International Limited	United States	$1160.00	100 mg	98%
MedChemExpress MCE	Sweden	$2516.80	25 mg	99.53%
Angene	China → Hong Kong	$4266.67	30 mg	95%
Key Organics Ltd.	United Kingdom	$6900.00	10 mg	95%

Chemical Identity

CAS134-47-4

PubChem CIDNot recorded

DTXSIDDTXSID7059642

FormulaC21H16N2O9S2

Mol. Weight504.48 g/mol

SMILESOC1=CC(=CC2=CC(NC(=O)NC3=CC=C4C(O)=CC(=CC4=C3)S(O)(=O)=O)=CC=C12)S(O)(=O)=O

Data Sources

EPA TSCA InventoryRetrieved 2026-04-29
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-Naphthalenesulfonic acid, 7,7'-(carbonyldiimino)bis[4-hydroxy- (CAS 134-47-4) https://chemicalindependence.com/chemical/134-47-4/ EPA TSCA Inventory: CAS 134-47-4. Retrieved 2026-04-29. https://www.epa.gov/tsca-inventory EPA Chemical Data Reporting: 134-47-4. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 134-47-4. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 292421 for CAS 134-47-4. Reporting year: 2024. https://usatrade.census.gov/