C.I. Reactive Orange 5

CAS 70210-21-8

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

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

Molecular structure of 70210-21-8 — 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.

Vendor Pricing

$0.47/gAA BLOCKS (2 weeks)

CountryUnited States

Pack$234.00 / 500 g

PurityNot recorded

Vendors2 available

Prices reflect listed pack sizes. Small research packs run far above bulk rates.

1 more vendor

Vendor	Country	$/g	Pack	Purity
Aaron Chemicals LLC	Hong Kong	$0.63	500 g	—

Chemical Identity

CAS70210-21-8

PubChem CIDNot recorded

DTXSIDDTXSID90890053

FormulaC26H17ClN7Na3O10S3

Mol. Weight788.06 g/mol

SMILES[Na+].[Na+].[Na+].CN(C1=CC2=CC(=C(N=NC3=CC=CC=C3S([O-])(=O)=O)C(O)=C2C=C1)S([O-])(=O)=O)C1=NC(Cl)=NC(NC2=CC=CC(=C2)S([O-])(=O)=O)=N1

Data Sources

EPA TSCA InventoryRetrieved 2026-10-04

← Back to Dashboard

Brief citations

C.I. Reactive Orange 5 (CAS 70210-21-8) https://chemicalindependence.com/chemical/70210-21-8/ EPA TSCA Inventory: CAS 70210-21-8. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory