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Fluorescent Brightener 208

CAS 24565-13-7

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

Molecular structure of 24565-13-7
2 Na⁺
US productionNot reported
Import value, 2024$309M
Top sourceChina 40%

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

Production is reported production, not a complete census of factories. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 293369 · basket

These shares come from HS customs code 293369, which covers 192 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
CN 40%ChinaJP 19%JapanIN 15%IndiaES 11%SpainDE 5%Germany

Why It Matters

No EPA sector or FDA product records name a use for this chemical.

Chemical Identity

CAS24565-13-7
PubChem CIDNot recorded
DTXSIDDTXSID0067000
FormulaC36H34N12Na2O6S2
Mol. Weight840.85 g/mol
SMILES[Na+].[Na+].CCNC1=NC(NC2=CC(=C(C=CC3=CC=C(NC4=NC(NC5=CC=CC=C5)=NC(NCC)=N4)C=C3S([O-])(=O)=O)C=C2)S([O-])(=O)=O)=NC(NC2=CC=CC=C2)=N1

Data Sources

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Brief citations

Fluorescent Brightener 208 (CAS 24565-13-7) https://chemicalindependence.com/chemical/24565-13-7/ EPA TSCA Inventory: CAS 24565-13-7. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 293369 for CAS 24565-13-7. Reporting year: 2024. https://usatrade.census.gov/