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Benzenesulfonic acid, 4-[2-(4-hydroxy-1-naphthalenyl)diazenyl]-, sodium salt (1:1)

CAS 523-44-4

EPA and Census publish no US supply data for this chemical.

Molecular structure of 523-44-4
1 NaH
US productionNot reported
Top sourceNo public record

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

Where It Comes From

EPA and Census publish no US supply data for this chemical.

Why It Matters

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

Vendor Pricing

$41.00/gTargetMol Chemicals
CountryChina (registered: United States)
Pack$41.00 / 1 g
Purity96.48%
Vendors1 available

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

Chemical Identity

CAS523-44-4
PubChem CIDNot recorded
DTXSIDDTXSID50883421
FormulaC16H11N2NaO4S
Mol. Weight350.32 g/mol
SMILES[NaH].OC1=CC=C(N=NC2=CC=C(C=C2)S([O-])(=O)=O)C2=C1C=CC=C2

Data Sources

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Brief citations

Benzenesulfonic acid, 4-[2-(4-hydroxy-1-naphthalenyl)diazenyl]-, sodium salt (1:1) (CAS 523-44-4) https://chemicalindependence.com/chemical/523-44-4/ EPA TSCA Inventory: CAS 523-44-4. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory