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Optical brighteners

Fba 185

Also known as Fluorescent Brightener 185, Benzoxazole, 2,2'-(2,5-thiophenediyl)bis-, 2,2'-Thiophene-2,5-diylbis(benzoxazole)

CAS 2866-43-5Formula C18H10N2O2SMolar mass 318.36 g/molEC 220-685-1
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Fba 185 chemical structure, C18H10N2O2S, CAS 2866-43-5
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
2866-43-5
Formula
C18H10N2O2S
Molar mass
318.36 g/mol
EC number
220-685-1
HS code
320420
Category
Optical brighteners

What is Fba 185?

Plain description, key identifiers and synonyms

Fba 185 is a chemical substance with the molecular formula C18H10N2O2S and a molar mass of 318.36 g/mol. Its CAS registry number is 2866-43-5. The IUPAC name is 2-[5-(1,3-benzoxazol-2-yl)thiophen-2-yl]-1,3-benzoxazole.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
2-[5-(1,3-benzoxazol-2-yl)thiophen-2-yl]-1,3-benzoxazole
CAS number
2866-43-5 CAS number cross-checkedOther or deprecated CAS: 12224-41-8
EC numbers
220-685-1, 602-368-3, 602-369-9
Molecular formula
C18H10N2O2S
UNII
P104CN84X2
MDL number
MFCD00205000
InChIKey
UGFSLKRMHPGLFU-UHFFFAOYSA-N
InChI
InChI=1S/C18H10N2O2S/c1-3-7-13-11(5-1)19-17(21-13)15-9-10-16(23-15)18-20-12-6-2-4-8-14(12)22-18/h1-10H
SMILES (canonical and isomeric)
C1=CC=C2C(=C1)N=C(O2)C3=CC=C(S3)C4=NC5=CC=CC=C5O4

Synonyms

  • Fluorescent Brightener 185
  • Benzoxazole, 2,2'-(2,5-thiophenediyl)bis-
  • 2,2'-Thiophene-2,5-diylbis(benzoxazole)
  • Uvitex EBF
  • 2,5-Bis(2-benzoxazolyl)thiophene
  • 2,2'-(2,5-Thiophenediyl)bis-benzoxazole
  • Thiophenebis(benzoxazolyl)
  • SOF (fluorescent brightener)
  • 2,5-Bis(benzo[d]oxazol-2-yl)thiophene
  • 2-[5-(1,3-benzoxazol-2-yl)thiophen-2-yl]-1,3-benzoxazole
  • 2,5-DI(Benzoxazol-2-YL)thiophene
  • 2,5-Bis(2-benzoxazoyl)thiophene
  • Uvitex sof
  • 2,5-Bis(benzoxazol-2-yl)thiophene
  • Thiophene, 2,5-di(benzoxazol-2-yl)-
  • 2,2'-(2,5-Thiophenediyl)bisbenzoxazole
  • Tinopal sop
  • C.I. Fluorescent brightening agent 190
  • 2,2-(2,5-Thiophenediyl)bis-benzoxazole
  • C.I. Fluorescent Brightening Agent 185
  • Fluorescent Brightener Ebf
  • 2,5-dibenzoxazol-2-ylthiophene
  • 2-[5-(1,3-benzoxazol-2-yl)-2-thienyl]-1,3-benzoxazole
  • 2,5-di(benzo[d]oxazol-2-yl)thiophene
  • C.i. fluorescent brightener 172
Show all 31 synonyms
  • 2,2'-thiene-2,5-diylbis(1,3-benzoxazole)
  • C.I. 515240
  • US8703811, 83
  • 2,2'-(Thiophene-2,5-diyl)bis(1,3-benzoxazole)
  • 2,2'-(2,5-Thiophenediyl)bis(benzoxazole)
  • Fluorescent Brightener 185(2866-43-5/12224-41-8 pound(c)

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
318.36 g/molcalc.
Exact mass
318.0463 Dacalc.
LogP (octanol/water)
5.36calc.
Topological polar surface area
52.06 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
5calc.
Rotatable bonds
2calc.
Heavy atoms
23calc.
Rings
5calc.
Aromatic rings
5calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (1 violation)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, c1ccc2oc(-c3ccc(-c4nc5ccccc5o4)s3)nc2c1

c1ccc2oc(-c3ccc(-c4nc5ccccc5o4)s3)nc2c1

5 rings, 23 atoms. This chemical is the scaffold itself.

13 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

No GHS hazard classification is recorded for this substance yet. That does not mean it is harmless.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Fba 185 suppliers

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All 3 suppliers

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Where suppliers are based

3 suppliers in 1 country

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Fba 185 price

Indicative price range per kg from live supplier offers

No published prices right now

Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

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Uses and applications

What the substance is used for, by industry and function

Functional uses

  • Brightener

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Fba 185 is traded under.

HS 3204.20Indicative HS code

Synthetic organic products of a kind used as fluorescent brightening agents

World exports in 2024
$485M
−7.4% vs 2023, imports $474M
2019 to 2024
Top exporters
  1. China31.6%
  2. Germany10.8%
  3. Switzerland * partner reported10.0%
Top importers
  1. United States9.6%
  2. Germany9.1%
  3. Indonesia7.1%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Fba 185 is indicative (it is known at chapter level only). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Fba 185, based on the data on this page

What is Fba 185?

Fba 185 is a chemical substance with the molecular formula C18H10N2O2S and a molar mass of 318.36 g/mol. Its CAS registry number is 2866-43-5. The IUPAC name is 2-[5-(1,3-benzoxazol-2-yl)thiophen-2-yl]-1,3-benzoxazole.

What is the CAS number of Fba 185?

The CAS registry number of Fba 185 is 2866-43-5. Other or deprecated CAS numbers: 12224-41-8.

What is the molecular formula and weight of Fba 185?

The molecular formula of Fba 185 is C18H10N2O2S and its molar mass is 318.36 g/mol.

What is Fba 185 used for?

Known uses and roles of Fba 185 include optical brighteners in textiles and leather, optical brighteners in home care and cleaning and brightener.

Is Fba 185 hazardous?

No GHS hazard classification for Fba 185 is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of Fba 185?

Fba 185 is usually classified under HS code 320420 (Synthetic organic products of a kind used as fluorescent brightening agents). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Fba 185?

CompoundList lists 3 suppliers of Fba 185 in China. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Fba 185?

Suppliers quote Fba 185 on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Fba 185

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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