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Fluorescent dyes and stains

Styryl 7

Also known as exciton(1+), 4-[(1E,3E)-4-(3-ethyl-1,3-benzothiazol-3-ium-2-yl)buta-1,3-dienyl]-N,N-dimethylaniline, exciton cation

CAS 114720-33-1Formula C21H23N2S+Molar mass 335.50 g/molEC 624-489-0
GHS signal word: Warning. Pictograms: Harmful or irritant
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Styryl 7 chemical structure, C21H23N2S+, CAS 114720-33-1
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
114720-33-1
Formula
C21H23N2S+
Molar mass
335.50 g/mol
EC number
624-489-0
HS code
293420
Category
Fluorescent dyes and stains

What is Styryl 7?

Plain description, key identifiers and synonyms

Exciton(1+) is a cationic C3 cyanine-type compound with 4-(dimethylamino)phenyl and 3-ethyl-1,3-benzothiazolium groups at either end. It has a role as a fluorochrome. It is a tertiary amine and a benzothiazolium ion.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
4-[(1E,3E)-4-(3-ethyl-1,3-benzothiazol-3-ium-2-yl)buta-1,3-dienyl]-N,N-dimethylaniline
CAS number
114720-33-1 CAS number cross-checkedOther or deprecated CAS: 1565796-99-7
EC number
624-489-0
Molecular formula
C21H23N2S+
InChIKey
NRPYYACQUPIKLE-UHFFFAOYSA-N
InChI
InChI=1S/C21H23N2S/c1-4-23-19-10-6-7-11-20(19)24-21(23)12-8-5-9-17-13-15-18(16-14-17)22(2)3/h5-16H,4H2,1-3H3/q+1
Canonical SMILES
CC[n+]1c(C=CC=Cc2ccc(N(C)C)cc2)sc2ccccc21
Isomeric SMILES
CC[N+]1=C(SC2=CC=CC=C21)/C=C/C=C/C3=CC=C(C=C3)N(C)C

Synonyms

  • exciton(1+)
  • 4-[(1E,3E)-4-(3-ethyl-1,3-benzothiazol-3-ium-2-yl)buta-1,3-dienyl]-N,N-dimethylaniline
  • exciton cation
  • 2-[(1E,3E)-4-(4-Dimethylamino-phenyl)-buta-1,3-dienyl]-3-ethyl-benzothiazol-3-ium
  • 2-{4-[4-(dimethylamino)phenyl]buta-1,3-dien-1-yl}-3-ethyl-1,3-benzothiazol-3-ium
  • 2-((1E,3E)-4-(4-(Dimethylamino)phenyl)buta-1,3-dien-1-yl)-3-ethylbenzo[d]thiazol-3-ium
  • [4-[(1E,3E)-4-(3-ethyl-1,3-benzothiazol-3-ium-2-yl)buta-1,3-dienyl]phenyl]-dimethyl-amine, perchlorate
  • 4-[(1E,3E)-4-(3-ethyl-1,3-benzothiazol-3-ium-2-yl)buta-1,3-dienyl]-N,N-dimethyl-aniline, perchlorate
  • 4-[4-(3-Ethyl-1,3-benzothiazol-2(3H)-ylidene)but-2-en-1-ylidene]-N,N-dimethylcyclohexa-2,5-dien-1-iminium

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
335.50 g/molcalc.
Exact mass
335.1576 Dacalc.
LogP (octanol/water)
5calc.
Topological polar surface area
7.12 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
5calc.
Heavy atoms
24calc.
Rings
3calc.
Aromatic rings
3calc.
Fraction sp3 carbons
0.19calc.
Formal charge
1calc.
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, C(C=Cc1nc2ccccc2s1)=Cc1ccccc1

C(C=Cc1nc2ccccc2s1)=Cc1ccccc1

3 rings, 19 atoms.

10 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
Precautionary statements (16)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P332 + P317If skin irritation occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • 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

Styryl 7 suppliers

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Styryl 7 price

Indicative price range per kg from live supplier offers

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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

Roles

  • dye
  • fluorescent dye
  • fluorochrome

Regulatory status

Inventories, regulations and trade controls that list this substance

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Styryl 7 is traded under.

HS 2934.20Indicative HS code

Compounds containing in the structure a benzothiazole ring-system (whether or not…

World exports in 2024
$662M
+4.3% vs 2023, imports $630M
2019 to 2024
Top exporters
  1. China62.9%
  2. Belgium14.6%
  3. United States5.4%
Top importers
  1. India * partner reported18.5%
  2. United States18.1%
  3. Brazil6.7%

* Partner reported figures, a lower bound.

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

The HS code shown for Styryl 7 is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Styryl 7, based on the data on this page

What is Styryl 7?

Exciton(1+) is a cationic C3 cyanine-type compound with 4-(dimethylamino)phenyl and 3-ethyl-1,3-benzothiazolium groups at either end. It has a role as a fluorochrome. It is a tertiary amine and a benzothiazolium ion.

What is the CAS number of Styryl 7?

The CAS registry number of Styryl 7 is 114720-33-1. Other or deprecated CAS numbers: 1565796-99-7.

What is the molecular formula and weight of Styryl 7?

The molecular formula of Styryl 7 is C21H23N2S+ and its molar mass is 335.50 g/mol.

What is Styryl 7 used for?

Known uses and roles of Styryl 7 include dye, fluorescent dye and fluorochrome.

Is Styryl 7 hazardous?

Styryl 7 carries the GHS signal word "Warning". Main hazards: causes skin irritation, causes serious eye irritation, may cause respiratory irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Styryl 7?

Styryl 7 is usually classified under HS code 293420 (Compounds containing in the structure a benzothiazole ring-system (whether or not…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Styryl 7?

Post a free request on CompoundList and suppliers of Styryl 7 will send you quotes. Your contact details stay private until you accept a quote.

What is the price of Styryl 7?

Suppliers quote Styryl 7 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 Styryl 7

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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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