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Disperse dyes

Thioindigo

Also known as Antinolo Red B, C.I. Vat Red 41, 4,4'-Diisothioindigo

CAS 522-75-8Formula C16H8O2S2Molar mass 296.37 g/molEC 208-336-1
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Thioindigo chemical structure, C16H8O2S2, CAS 522-75-8
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
522-75-8
Formula
C16H8O2S2
Molar mass
296.37 g/mol
EC number
208-336-1
HS code
320415
Category
Disperse dyes

What is Thioindigo?

Plain description, key identifiers and synonyms

Thioindigo is a chemical substance with the molecular formula C16H8O2S2 and a molar mass of 296.37 g/mol. Its CAS registry number is 522-75-8. The IUPAC name is (2Z)-2-(3-oxo-1-benzothiophen-2-ylidene)-1-benzothiophen-3-one.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
(2Z)-2-(3-oxo-1-benzothiophen-2-ylidene)-1-benzothiophen-3-one
CAS number
522-75-8
EC number
208-336-1
Molecular formula
C16H8O2S2
UNII
V993X7635Y
InChIKey
JOUDBUYBGJYFFP-NXVVXOECSA-N
InChI
InChI=1S/C16H8O2S2/c17-13-9-5-1-3-7-11(9)19-15(13)16-14(18)10-6-2-4-8-12(10)20-16/h1-8H/b16-15-
Canonical SMILES
O=C1C(=C2Sc3ccccc3C2=O)Sc2ccccc21
Isomeric SMILES
C1=CC=C2C(=C1)C(=O)/C(=C/3\C(=O)C4=CC=CC=C4S3)/S2

Synonyms

  • Antinolo Red B
  • C.I. Vat Red 41
  • 4,4'-Diisothioindigo
  • Benzo(b)thiophen-3(2H)-one, 2-(3-oxobenzo(b)thien-2(3H)-ylidene)-
  • (delta(sup 2,2'(3H,3'H))-Bibenzo(b)thiophene)-3,3'-dione
  • (delta-2,2'(3H,3'H)-bibenzo(b)thiophene)-3,3'-dione
  • Benzo[b]thiophen-3(2H)-one, 2-(3-oxobenzo[b]thien-2(3H)-ylidene)-
  • Durindone Red BP
  • Isothioindigo
  • Durindone Red B
  • Helindon Red BB
  • Thioindigo Red B
  • Thioindigo Red S
  • Tetra Pink B
  • Ciba Pink B
  • Tina Pink B
  • Heliane Red 5B
  • Tyrian Red A-5B
  • Vat Red 5B
  • (2Z)-2-(3-oxo-1-benzothiophen-2-ylidene)-1-benzothiophen-3-one
  • Vat Red 41
  • Durindone Printing Red B
  • 2-(3-Oxobenzo[b]thien-2(3H)-ylidene)benzo[b]thiophen-3(2H)-one
  • C.I. 73300
  • cis-thioindigo
Show all 34 synonyms
  • Solvent Red 242
  • Disperse Red 364
  • CI VAT RED 41
  • 5-19-05-00281 (Beilstein Handbook Reference)
  • Ci solvent red 242
  • Ci disperse red 364
  • 2-(3-Oxobenzo(b)thien-2(3H)-ylidene)benzo(b)thiophene-3(2H)-one
  • CI 73300
  • [delta2,2'(3H,3'H)-Bibenzo[b]thiophene]-3,3'-dione

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
296.37 g/molcalc.
Exact mass
295.9966 Dacalc.
LogP (octanol/water)
4.18calc.
Topological polar surface area
34.14 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
4calc.
Rotatable bonds
0calc.
Heavy atoms
20calc.
Rings
4calc.
Aromatic rings
2calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)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, O=C1C(=C2Sc3ccccc3C2=O)Sc2ccccc21

O=C1C(=C2Sc3ccccc3C2=O)Sc2ccccc21

4 rings, 20 atoms, the 2-(3-Oxo-1-benzothiophen-2-ylidene)-1-benzothiophen-3-one ring system.

27 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.

Thioindigo suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 7 suppliers
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Where suppliers are based

7 suppliers in 2 countries

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Thioindigo price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Industries and functions

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 Thioindigo is traded under.

HS 3204.15Indicative HS code

Vat dyes (including those usable in that state as pigments) and preparations based thereon

World exports in 2024
$435M
−7.3% vs 2023, imports $357M
2019 to 2024
Top exporters
  1. China60.2%
  2. Singapore10.7%
  3. India * partner reported8.7%
Top importers
  1. India * partner reported17.1%
  2. Turkey10.7%
  3. Singapore10.6%

* Partner reported figures, a lower bound.

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

The HS code shown for Thioindigo is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Thioindigo, based on the data on this page

What is Thioindigo?

Thioindigo is a chemical substance with the molecular formula C16H8O2S2 and a molar mass of 296.37 g/mol. Its CAS registry number is 522-75-8. The IUPAC name is (2Z)-2-(3-oxo-1-benzothiophen-2-ylidene)-1-benzothiophen-3-one.

What is the CAS number of Thioindigo?

The CAS registry number of Thioindigo is 522-75-8.

What is the molecular formula and weight of Thioindigo?

The molecular formula of Thioindigo is C16H8O2S2 and its molar mass is 296.37 g/mol.

What is Thioindigo used for?

Known uses and roles of Thioindigo include textile dyes in textiles and leather.

Is Thioindigo hazardous?

No GHS hazard classification for Thioindigo 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 Thioindigo?

Thioindigo is usually classified under HS code 320415 (Vat dyes (including those usable in that state as pigments) and preparations based thereon). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Thioindigo?

CompoundList lists 7 suppliers of Thioindigo in India and China. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Thioindigo in India?

4 suppliers in India list Thioindigo on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Thioindigo?

Suppliers quote Thioindigo 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

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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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