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C.I. Fluorescent Brightener 213

CAS 3426-43-5

Benzenesulfonic acid, 2,2'-(1,2-ethenediyl)bis[5-[[4-methoxy-6-(phenylamino)-1,3,5-triazin-2-yl]amino]-, sodium salt (1:2)

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

Molecular structure of 3426-43-5
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

CAS3426-43-5
PubChem CIDNot recorded
DTXSIDDTXSID90889467
FormulaC34H28N10Na2O8S2
Mol. Weight814.76 g/mol
SMILES[Na+].[Na+].COC1=NC(NC2=CC=CC=C2)=NC(NC2=CC=C(C=CC3=CC=C(NC4=NC(OC)=NC(NC5=CC=CC=C5)=N4)C=C3S([O-])(=O)=O)C(=C2)S([O-])(=O)=O)=N1

Data Sources

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Brief citations

C.I. Fluorescent Brightener 213 (CAS 3426-43-5) https://chemicalindependence.com/chemical/3426-43-5/ EPA TSCA Inventory: CAS 3426-43-5. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory