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CAS 1533-45-5 may appear across multiple EU annex records. The CAS lookup page shows all Annex II–VI entries sharing this identifier, useful for identifying cross-annex regulatory status of the same chemical substance.

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InventoryRef 8843822/05/2014

FLUORESCENT BRIGHTENER 393

Fluorescent Brightener 393 is the organic compound.

FLUORESCENT BRIGHTENER 393 is listed in the EU CosIng inventory, but no direct annex records are linked on this page yet.

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Regulatory evidence by market

No rule for this ingredient has been imported for any of the 13 markets tracked here.

That describes this inventory, not the law. No imported rule is not evidence that an ingredient is permitted: a rule may exist under another name or identifier, or in a dataset not yet imported here.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 1533-45-5

CAS 1533-45-5PubChem CID 73744

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

IUPAC name: 2-[4-[2-[4-(1,3-benzoxazol-2-yl)phenyl]ethenyl]phenyl]-1,3-benzoxazole

Molecular formula: C28H18N2O2
Molecular weight: 414.5 g/mol
Exact mass: 414.136827821 Da
XLogP3: 7.2
Topological polar surface area: 52.1 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 4
Covalent units: 1
Defined stereocentres: 0

Also known as

Benzoxazole, 2,2'-(1,2-ethenediyldi-4,1-phenylene)bis-RefChem:5065511,2-Bis(4-(benzo[d]oxazol-2-yl)phenyl)etheneC28H18N2O2Fluorescent brightener OB-1OPTICAL BRIGHTENER 1CS-W011665AC-10112

12 more reported names

4,4'-Bis(1,3-benzoxazol-2-yl)stilbene4,4'-BIS(2-BENZOXAZOLYL)STILBENE, TRANS-ORACIQIJMCYPHQ-UHFFFAOYSA-N4,4'-bis(2-benzoxazolyl) stilbene1,2-Bis(4-(benzo[d]oxazol-2-yl)pDB-043188B27292,2\'-(1,2-Ethenediyldi-4,1-phenylene)bisbenzoxazoleFluorescent brightener 393 Solution in DMSO, 10ug/mL2,2'-[Ethene-1,2-diyldi(4,1-phenylene)]bis(1,3-benzoxazole)2-[4-[2-[4-(1,3-benzoxazol-2-yl)phenyl]vinyl]phenyl]-1,3-benzoxazoleBBS

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

EPA DTXSID:DTXSID4051744
PubMed:20048416
PubMed:16494319
PubMed:12433104

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Inventory details for FLUORESCENT BRIGHTENER 393

INCI name

FLUORESCENT BRIGHTENER 393

Description

Fluorescent Brightener 393 is the organic compound.

Record provenance

Inventory reference: 88438
Imported identity: FLUORESCENT BRIGHTENER 393
Source update: 22/05/2014

European Commission CosIng source notes

Annex records for FLUORESCENT BRIGHTENER 393

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Key data

CAS

1533-45-5

—

Restriction

—

Function

COLORANT: Exclusively or mainly intended to colour the cosmetic product, the body as a whole or certain parts thereof, by absorption or reflection of visible light. All authorised colorants are substances in the positive list of Annex IV to the Cosmetics Regulation 1223/2009.

Official EU ingredient-name evidence

The ingredient name exactly matches the official 2025 EU glossary of common ingredient names.

#10557 · FLUORESCENT BRIGHTENER 393

Ingredients with overlapping formulation functions

EPOXY RESIN COATED ALUMINUM POWDERCOLORANT

EUROPIUM TRIS(TRIFLUOROTHIENYLBUTANEDIONE) BIS(TRIPHENYLPHOSPHINE OXIDE)COLORANT

FISETINCOLORANT, SKIN CONDITIONING

FLUORESCENT BRIGHTENER 264 HYDROLYZED HYALURONATECOLORANT

FUMARIC ACID/PHTHALIC ANHYDRIDE/TRICYCLODECANEDIMETHANOL COPOLYMERBINDING, COLORANT, FILM FORMING, NAIL CONDITIONING, VISCOSITY CONTROLLING

GARCINIA HANBURYI SAP POWDERCOLORANT

GARDENIA JASMINOIDES FRUIT EXTRACTCOLORANT

GLYCIDOXYPROPYL TRIMETHOXYSILANE/PEI-250 CROSSPOLYMER FLUORESCENT BRIGHTENER 23…COLORANT, OPACIFYING

Additional official and scientific sources

11 external databases to check this identity in

Each link searches that source for this identity. What each source is, and its legal weight

ECHA CHEM / Information on chemicals PubChem PUG REST EU Safety Gate cosmetic product alerts ECHA CHEM US EPA CompTox Cosmetic Ingredient Review safety assessments FDA Global Substance Registration System ILO/WHO International Chemical Safety Cards Japan NITE-CHRIP NIOSH Pocket Guide to Chemical Hazards OECD eChemPortal

How FLUORESCENT BRIGHTENER 393 appears in the CosIng inventory

The CosIng inventory lists FLUORESCENT BRIGHTENER 393 as a cosmetic ingredient and this page links it to 0 annex records. The inventory entry captures names and identifiers, while the annex records show where the substance is prohibited, restricted or positively listed in EU cosmetics law.

FLUORESCENT BRIGHTENER 393 is also tagged with 1 cosmetic function in the official data. Function labels describe intended use, but they do not replace regulatory review of linked annex records before formulation or labelling work.

Frequently asked questions

FLUORESCENT BRIGHTENER 393 is listed in the EU CosIng ingredient inventory with no direct annex restriction records linked at this time. Absence of an annex link does not guarantee unrestricted use — always verify against the current official CosIng database before formulating.

According to the EU CosIng inventory, FLUORESCENT BRIGHTENER 393 carries the following function designation(s):

COLORANT

CAS 1533-45-5 may appear across multiple EU annex records. Viewing the CAS lookup page shows all Annex II–VI entries sharing this identifier, which is useful for identifying cross-annex regulatory status of the same chemical substance.

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Source note for FLUORESCENT BRIGHTENER 393

This page reproduces the CosIng inventory entry for FLUORESCENT BRIGHTENER 393 from public European Commission cosmetic ingredient materials and shows linked identifiers even when no direct annex match is currently attached.

Use this inventory page to research FLUORESCENT BRIGHTENER 393 and compare linked records, but verify restrictions and legal status against the current official source text and law before making regulatory decisions.

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