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C.I. Reactive Blue 187

CAS 79771-28-1

Pyridinium, 1,1'-[(6,13-dichloro-4,11-disulfo-3,10-triphenodioxazinediyl)bis[imino-2,1-ethanediylimino[6-[(2,5-disulfophenyl)amino]-1,3,5-triazine-4,2-diyl]]]bis[3-carboxy-, bis(inner salt), sodium salt (1:6)

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

Molecular structure of 79771-28-1
6 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

CAS79771-28-1
PubChem CIDNot recorded
DTXSIDDTXSID90893645
FormulaC52H34Cl2N16Na6O24S6
Mol. Weight1668.13 g/mol
SMILES[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].OC(=O)C1=C[N+](=CC=C1)C1=NC(NCCNC2=CC=C3N=C4C(Cl)=C5OC6=C(C=CC(NCCNC7=NC(NC8=C(C=CC(=C8)S([O-])(=O)=O)S([O-])(=O)=O)=NC(=N7)[N+]7=CC=CC(=C7)C(O)=O)=C6S([O-])(=O)=O)N=C5C(Cl)=C4OC3=C2S([O-])(=O)=O)=NC(NC2=C(C=CC(=C2)S([O-])(=O)=O)S([O-])(=O)=O)=N1

Data Sources

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Brief citations

C.I. Reactive Blue 187 (CAS 79771-28-1) https://chemicalindependence.com/chemical/79771-28-1/ EPA TSCA Inventory: CAS 79771-28-1. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory