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C.I. Acid Orange 3

CAS 6373-74-6

Benzenesulfonic acid, 5-[(2,4-dinitrophenyl)amino]-2-(phenylamino)-, sodium salt (1:1)

Molecular structure of 6373-74-6
1 Na⁺
US productionNot reported
Import value, 2024$56M
Top sourceIndia 70%

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 320412 · basket

These shares come from HS customs code 320412, which covers 106 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
IN 70%IndiaMY 7%MalaysiaCH 4%SwitzerlandCN 4%ChinaDE 3%Germany

Why It Matters

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

Vendor Pricing

$380.00/gAngene Chemical
CountryChina (registered: Hong Kong)
Pack$38.00 / 100 mg
Purity99%
Vendors7 available

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

6 more vendors
VendorCountry$/gPackPurity
Aaron Chemicals LLCHong Kong$380.00100 mg99%
AK Scientific, Inc.United States$448.001 g—
A2B Chem LLCUnited States$482.001 g—
AA BLOCKSUnited States$498.001 g—
Angene International LimitedUnited States$723.001 g—
AngeneChina → Hong Kong$4266.6730 mg99%

Chemical Identity

CAS6373-74-6
PubChem CIDNot recorded
DTXSIDDTXSID1021081
FormulaC18H13N4NaO7S
Mol. Weight452.37 g/mol
SMILES[Na+].[O-][N+](=O)C1=CC(=C(NC2=CC(=C(NC3=CC=CC=C3)C=C2)S([O-])(=O)=O)C=C1)[N+]([O-])=O

Data Sources

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Brief citations

C.I. Acid Orange 3 (CAS 6373-74-6) https://chemicalindependence.com/chemical/6373-74-6/ EPA TSCA Inventory: CAS 6373-74-6. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 320412 for CAS 6373-74-6. Reporting year: 2024. https://usatrade.census.gov/