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2,7-Naphthalenedisulfonic acid, 4-[2-[2,4-dihydroxy-5-[2-(2-hydroxy-3,5-dinitrophenyl)diazenyl]-3-[2-(4-nitrophenyl)diazenyl]phenyl]diazenyl]-5-hydroxy-, sodium salt (1:2)

CAS 6637-87-2

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

Molecular structure of 6637-87-2
2 Na⁺
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

CAS6637-87-2
PubChem CIDNot recorded
DTXSIDDTXSID30889567
FormulaC28H15N9Na2O16S2
Mol. Weight843.57 g/mol
SMILES[Na+].[Na+].OC1=CC(=CC2=CC(=CC(N=NC3=CC(N=NC4=CC(=CC(=C4O)[N+]([O-])=O)[N+]([O-])=O)=C(O)C(N=NC4=CC=C(C=C4)[N+]([O-])=O)=C3O)=C12)S([O-])(=O)=O)S([O-])(=O)=O

Data Sources

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Brief citations

2,7-Naphthalenedisulfonic acid, 4-[2-[2,4-dihydroxy-5-[2-(2-hydroxy-3,5-dinitrophenyl)diazenyl]-3-[2-(4-nitrophenyl)diazenyl]phenyl]diazenyl]-5-hydroxy-, sodium salt (1:2) (CAS 6637-87-2) https://chemicalindependence.com/chemical/6637-87-2/ EPA TSCA Inventory: CAS 6637-87-2. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory