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Fluorescent dyes and stains

Thioflavin T

Also known as Thioflavine T, Basic yellow 1, Acronol Yellow TC

CAS 2390-54-7Formula C17H19ClN2SMolar mass 318.87 g/molEC 219-228-9
GHS signal word: Danger. Pictograms: Corrosive, Acute toxicity (severe), Harmful or irritant, Hazardous to the environment 74 suppliers listed
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Thioflavin T chemical structure, C17H19ClN2S, CAS 2390-54-7
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
2390-54-7
Formula
C17H19ClN2S
Molar mass
318.87 g/mol
EC number
219-228-9
HS code
320413
Category
Fluorescent dyes and stains

What is Thioflavin T?

Plain description, key identifiers and synonyms

Thioflavine T is an organic chloride salt having 2-[4-(dimethylamino)phenyl]-3,6-dimethyl-1,3-benzothiazol-3-ium as the counterion. It is widely used to visualise and quantify the presence of amyloids, both in vitro and in vivo. It has a role as a geroprotector, a fluorochrome and a histological dye. It contains a thioflavin T cation.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
4-(3,6-dimethyl-1,3-benzothiazol-3-ium-2-yl)-N,N-dimethylaniline chloride
CAS number
2390-54-7 CAS number cross-checked
EC number
219-228-9
Molecular formula
C17H19ClN2S
UNII
CAX9SG0II0
MDL number
MFCD00011944
InChIKey
JADVWWSKYZXRGX-UHFFFAOYSA-M
InChI
InChI=1S/C17H19N2S.ClH/c1-12-5-10-15-16(11-12)20-17(19(15)4)13-6-8-14(9-7-13)18(2)3;/h5-11H,1-4H3;1H/q+1;/p-1
SMILES (canonical and isomeric)
CC1=CC2=C(C=C1)[N+](=C(S2)C3=CC=C(C=C3)N(C)C)C.[Cl-]

Synonyms

  • Thioflavine T
  • Basic yellow 1
  • Acronol Yellow TC
  • C.I. Basic Yellow 1
  • C.I. 49005
  • Benzothiazolium, 2-[4-(dimethylamino)phenyl]-3,6-dimethyl-, chloride
  • 3,6-Dimethyl-2-dimethylaminophenylbenzothiazolium chloride
  • Benzothiazolium, 2-(p-(dimethylamino)phenyl)-3,6-dimethyl-, chloride
  • Benzothiazolium, 2-(4-(dimethylamino)phenyl)-3,6-dimethyl-, chloride
  • Benzothiazolium, 2-(4-(dimethylamino)phenyl)-3,6-dimethyl-, chloride (1:1)
  • 2-(p-(dimethylamino)phenyl)-3,6-dimethylbenzothiazolium chloride
  • Benzothiazolium, 2-[4-(dimethylamino)phenyl]-3,6-dimethyl-, chloride (1:1)
  • ThT (dye)
  • 2-(4-(Dimethylamino)phenyl)-3,6-dimethylbenzo[d]thiazol-3-ium chloride
  • Setoflavine T
  • Tannoflavine T
  • Setoflavin T
  • Rhoduline Yellow
  • Thioflavin TG
  • Thioflavine TCN
  • Thioflavine TG
  • Citroflavine 8G
  • Primoflavine 8G
  • Thioflavin TCN
  • Basic Yellow T
Show all 38 synonyms
  • Purimofurabin 8G
  • Acronol Yellow T
  • Thioflavine TCND
  • Methylene Yellow N
  • Brilliant Flavine T
  • Methylene Yellow NI
  • Thioflavin TCN extra
  • Acronol Lake Yellow T
  • Acronol Lake Yellow TC
  • Acronol Yellow TC180
  • Nankai Basic Flavine 8G
  • Kansai Basic Flavine 8GO
  • Methyldehydrothio-p-toluidine sulfonate

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
318.87 g/molcalc.
Exact mass
318.0957 Dacalc.
LogP (octanol/water)
0.77calc.
Topological polar surface area
7.12 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
2calc.
Heavy atoms
21calc.
Rings
3calc.
Aromatic rings
3calc.
Fraction sp3 carbons
0.24calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
2calc.
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, c1ccc(-c2nc3ccccc3s2)cc1

c1ccc(-c2nc3ccccc3s2)cc1

3 rings, 15 atoms, the 2-Phenylbenzothiazole ring system.

652 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS05: Corrosive
Corrosive
GHS06: Acute toxicity (severe)
Acute toxicity (severe)
GHS07: Harmful or irritant
Harmful or irritant
GHS09: Hazardous to the environment
Hazardous to the environment

Hazard statements

  • H301Toxic if swallowed.
  • H317May cause an allergic skin reaction.
  • H318Causes serious eye damage.
  • H400Very toxic to aquatic life.
  • H410Very toxic to aquatic life with long lasting effects.
Precautionary statements (18)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P270Do not eat, drink or smoke when using this product.
  • P272Contaminated work clothing should not be allowed out of the workplace.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P302 + P352If on skin: Wash with plenty of water.
  • P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P317Get medical help.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P333 + P317If skin irritation or rash occurs: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P391Collect spillage.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.

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

Full safety data and first aid

Thioflavin T suppliers

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All 74 suppliers
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Where suppliers are based

74 suppliers in 10 countries

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Thioflavin T 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

Pharmacological actions

  • Fluorescent Dyes

Roles

  • dye
  • fluorescent dye
  • fluorochrome
  • geroprotector
  • histological dye
  • pharmaceutical
  • protective agent

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 Thioflavin T is traded under.

HS 3204.13Indicative HS code

Basic dyes and preparations based thereon

World exports in 2024
$209M
−2.6% vs 2023, imports $224M
2019 to 2024
Top exporters
  1. India * partner reported27.9%
  2. China21.8%
  3. Spain6.6%
Top importers
  1. United States11.2%
  2. China7.9%
  3. Germany7.4%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

Quick answers about Thioflavin T, based on the data on this page

What is Thioflavin T?

Thioflavine T is an organic chloride salt having 2-[4-(dimethylamino)phenyl]-3,6-dimethyl-1,3-benzothiazol-3-ium as the counterion. It is widely used to visualise and quantify the presence of amyloids, both in vitro and in vivo. It has a role as a geroprotector, a fluorochrome and a histological dye.

What is the CAS number of Thioflavin T?

The CAS registry number of Thioflavin T is 2390-54-7.

What is the molecular formula and weight of Thioflavin T?

The molecular formula of Thioflavin T is C17H19ClN2S and its molar mass is 318.87 g/mol.

What is Thioflavin T used for?

Known uses and roles of Thioflavin T include textile dyes in textiles and leather, indicators and stains in research and laboratory, fluorescent probes in research and laboratory, dye, fluorescent dye and 6 more.

Is Thioflavin T hazardous?

Thioflavin T carries the GHS signal word "Danger". Main hazards: toxic if swallowed, may cause an allergic skin reaction, causes serious eye damage. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Thioflavin T?

Thioflavin T is usually classified under HS code 320413 (Basic dyes and preparations based thereon). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Thioflavin T?

CompoundList lists 74 suppliers of Thioflavin T in United States, China, United Kingdom, Japan and 6 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Thioflavin T in India?

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

What is the price of Thioflavin T?

Suppliers quote Thioflavin T 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 Thioflavin T

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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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