4,4'-Bis(2-benzoxazolyl)stilbene

CAS 1533-45-5

EPA’s 2023 records show zero U.S. production of this chemical.

US productionZero

Import volumeCBI

Confidential Business Information. The EPA withholds this volume because publishing it could reveal the reporting company's trade secrets.

Top sourceNo public record

At least one company claimed its 2023 production or import volume for this chemical as confidential, so EPA withholds it.

Why supply is unknown

Production is reported production, not a complete census of factories. Production reporting year: 2023.

Where It Comes From

EPA reports by year

2023: US production Zero · Imports Confidential
2019: US production Confidential · Imports Confidential

Domestic parents -- activity not disclosed (1)

EPA records name a US company for this chemical but do not disclose whether the company made it here or imported it.

Milliken &

EPA-registered importers (3)

Companies that report making or importing this chemical to the EPA. Registration is US-centric and does not indicate import origin.

Sakai Trading · JP Japan

Mayzo

Sakai Trading New York

Why It Matters

Sectors

ConstructionTextiles

Downstream UsesNot recorded

FDA Shortage Status

Whether any manufacturer currently reports this drug as in shortage on the FDA Drug Shortages database. "Active Shortage" means at least one presentation has status "current."

No FDA shortage records

Industrial Uses

Used in 2 sectors as 2 functional roles.

•Brightener in Textiles, apparel, and leather manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
•Antioxidant in Adhesive Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product

Vendor Pricing

$0.04/gAaron Chemicals LLC

CountryHong Kong

Pack$19.00 / 500 g

PurityNot recorded

Vendors3 available

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

2 more vendors

Vendor	Country	$/g	Pack	Purity
AA BLOCKS	United States	$0.09	1 kg	97%
Apollo Scientific US	United Kingdom	$0.12	1 kg	95%

Chemical Identity

CAS1533-45-5

PubChem CID73744

DTXSIDDTXSID4051744

FormulaC28H18N2O2

Mol. Weight414.5 g/mol

SMILESC1=CC=C2C(=C1)N=C(O2)C3=CC=C(C=C3)C=CC4=CC=C(C=C4)C5=NC6=CC=CC=C6O5

Data Sources

EPA CompTox (DSSTox) · DTXSID4051744Retrieved 2026-04-06
PubChem · compound 73744Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04

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Brief citations

4,4'-Bis(2-benzoxazolyl)stilbene (CAS 1533-45-5) https://chemicalindependence.com/chemical/1533-45-5/ EPA CompTox (DSSTox): DTXSID4051744. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID4051744 PubChem: 73744. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/73744 EPA Chemical Data Reporting: 1533-45-5. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 1533-45-5. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting