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2,7-Naphthalenedisulfonic acid, 4-hydroxy-5-[2-[4-[[[[5-hydroxy-7-sulfo-6-[2-[2-sulfo-4-[2-(4-sulfophenyl)diazenyl]phenyl]diazenyl]-2-naphthalenyl]amino]carbonyl]amino]-5-methoxy-2-methylphenyl]diazenyl]-, sodium salt (1:5)

CAS 72987-21-4

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

Molecular structure of 72987-21-4
5 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

CAS72987-21-4
PubChem CIDNot recorded
DTXSIDDTXSID40904876
FormulaC41H27N8Na5O19S5
Mol. Weight1210.95 g/mol
SMILES[Na+].[Na+].[Na+].[Na+].[Na+].COC1=C(NC(=O)NC2=CC=C3C(O)=C(\N=N\C4=CC=C(C=C4S([O-])(=O)=O)\N=N\C4=CC=C(C=C4)S([O-])(=O)=O)C(=CC3=C2)S([O-])(=O)=O)C=C(C)C(=C1)\N=N\C1=CC(=CC2=CC(=CC(O)=C12)S([O-])(=O)=O)S([O-])(=O)=O

Data Sources

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Brief citations

2,7-Naphthalenedisulfonic acid, 4-hydroxy-5-[2-[4-[[[[5-hydroxy-7-sulfo-6-[2-[2-sulfo-4-[2-(4-sulfophenyl)diazenyl]phenyl]diazenyl]-2-naphthalenyl]amino]carbonyl]amino]-5-methoxy-2-methylphenyl]diazenyl]-, sodium salt (1:5) (CAS 72987-21-4) https://chemicalindependence.com/chemical/72987-21-4/ EPA TSCA Inventory: CAS 72987-21-4. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory