Flag of the United StatesAmerican Chemical Independence

2-Naphthalenecarboxylic acid, 4-[2-(4-chloro-3-sulfophenyl)diazenyl]-3-hydroxy-, calcium salt (1:1)

CAS 7538-59-2

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

Molecular structure of 7538-59-2
1 Ca²⁺
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.

Chemical Identity

CAS7538-59-2
PubChem CIDNot recorded
DTXSIDDTXSID2064737
FormulaC17H9CaClN2O6S
Mol. Weight444.86 g/mol
SMILES[Ca++].OC1=C(C=C2C=CC=CC2=C1N=NC1=CC(=C(Cl)C=C1)S([O-])(=O)=O)C([O-])=O

Data Sources

← Back to Dashboard

Brief citations

2-Naphthalenecarboxylic acid, 4-[2-(4-chloro-3-sulfophenyl)diazenyl]-3-hydroxy-, calcium salt (1:1) (CAS 7538-59-2) https://chemicalindependence.com/chemical/7538-59-2/ EPA TSCA Inventory: CAS 7538-59-2. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory