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C.I. Reactive Red 56

CAS 72139-15-2

2,7-Naphthalenedisulfonic acid, 4-hydroxy-5-[[4-(methylamino)-6-[[3-[(2,5,6-trichloro-4-pyrimidinyl)amino]phenyl]amino]-1,3,5-triazin-2-yl]amino]-3-[2-(2-sulfophenyl)diazenyl]-, sodium salt (1:3)

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

Molecular structure of 72139-15-2
3 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

CAS72139-15-2
PubChem CIDNot recorded
DTXSIDDTXSID4041737
FormulaC30H19Cl3N11Na3O10S3
Mol. Weight965.05 g/mol
SMILES[Na+].[Na+].[Na+].CNC1=NC(NC2=CC(=CC3=C2C(O)=C(\N=N\C2=CC=CC=C2S([O-])(=O)=O)C(=C3)S([O-])(=O)=O)S([O-])(=O)=O)=NC(NC2=CC=CC(NC3=NC(Cl)=NC(Cl)=C3Cl)=C2)=N1

Data Sources

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Brief citations

C.I. Reactive Red 56 (CAS 72139-15-2) https://chemicalindependence.com/chemical/72139-15-2/ EPA TSCA Inventory: CAS 72139-15-2. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory