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4-[(7-Phenylbenzo[a]phenazin-5(7H)-ylidene)amino]benzene-1-sulfonic acid

CAS 25641-18-3

Benzo[a]phenazinium, 7-phenylsulfo-5-[(4-sulfophenyl)amino]-, inner salt, sodium salt (1:1)

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

Molecular structure of 25641-18-3
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

CAS25641-18-3
PubChem CIDNot recorded
DTXSIDDTXSID30948502
FormulaC28H19N3O3S
Mol. Weight477.54 g/mol
SMILESOS(=O)(=O)C1=CC=C(C=C1)N=C1C=C2N(C3=CC=CC=C3)C3=CC=CC=C3N=C2C2=CC=CC=C12

Data Sources

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Brief citations

4-[(7-Phenylbenzo[a]phenazin-5(7H)-ylidene)amino]benzene-1-sulfonic acid (CAS 25641-18-3) https://chemicalindependence.com/chemical/25641-18-3/ EPA TSCA Inventory: CAS 25641-18-3. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory