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Basic and cationic dyes

Basic Red 18

Also known as RED GTLH, CI BASIC RED 18, CI BASIC RED 33

CAS 25198-22-5Formula C19H25Cl2N5O2Molar mass 426.35 g/molEC 246-730-5
GHS signal word: Danger. Pictograms: Corrosive, Harmful or irritant, Hazardous to the environment
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Basic Red 18 chemical structure, C19H25Cl2N5O2, CAS 25198-22-5
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
25198-22-5
Formula
C19H25Cl2N5O2
Molar mass
426.35 g/mol
EC number
246-730-5
HS code
320413
Category
Basic and cationic dyes

What is Basic Red 18?

Plain description, key identifiers and synonyms

Basic Red 18 is a chemical substance with the molecular formula C19H25Cl2N5O2 and a molar mass of 426.35 g/mol. Its CAS registry number is 25198-22-5. The IUPAC name is 2-[4-[(2-chloro-4-nitrophenyl)diazenyl]-N-ethylanilino]ethyl-trimethylazanium chloride.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
2-[4-[(2-chloro-4-nitrophenyl)diazenyl]-N-ethylanilino]ethyl-trimethylazanium chloride
CAS number
25198-22-5 CAS number cross-checked
EC number
246-730-5
Molecular formula
C19H25Cl2N5O2
UNII
H5KZY0428H
InChIKey
ZFRUNHQZTYGGDY-UHFFFAOYSA-M
InChI
InChI=1S/C19H25ClN5O2.ClH/c1-5-23(12-13-25(2,3)4)16-8-6-15(7-9-16)21-22-19-11-10-17(24(26)27)14-18(19)20;/h6-11,14H,5,12-13H2,1-4H3;1H/q+1;/p-1
SMILES (canonical and isomeric)
CCN(CC[N+](C)(C)C)C1=CC=C(C=C1)N=NC2=C(C=C(C=C2)[N+](=O)[O-])Cl.[Cl-]

Synonyms

  • RED GTLH
  • CI BASIC RED 18
  • CI BASIC RED 33
  • C.I. BASIC RED 33
  • [2-[[4-[(2-Chloro-4-nitrophenyl)azo]phenyl]ethylamino]ethyl]trimethylammonium chloride
  • Ethanaminium, 2-((4-((2-chloro-4-nitrophenyl)azo)phenyl)ethylamino)-N,N,N-trimethyl-, chloride
  • Ethanaminium, 2-((4-(2-(2-chloro-4-nitrophenyl)diazenyl)phenyl)ethylamino)-N,N,N-trimethyl-, chloride (1:1)
  • CI 11085
  • (2-((4-((2-Chloro-4-nitrophenyl)azo)phenyl)ethylamino)ethyl)trimethylammonium chloride
  • Ethanaminium, 2-[[4-[(2-chloro-4-nitrophenyl)azo]phenyl]ethylamino]-N,N,N-trimethyl-, chloride
  • Trimethyl-(2-(N-(4-(2-chloro-4-nitrophenylazo)phenyl)-N-ethylamino)ethyl)ammonium chloride
  • Ethanaminium, 2-[[4-[2-(2-chloro-4-nitrophenyl)diazenyl]phenyl]ethylamino]-N,N,N-trimethyl-, chloride (1:1)
  • C.I. Basic Red 18
  • Ethanaminium, 2-[[4-[2-(2-chloro-4-nitrophenyl)diazenyl]phenyl]ethylamino]-N,N,N-trimethyl-, chloride
  • C.I. 11085
  • 2-[{4-[(2-Chloro-4-nitrophenyl)diazenyl]phenyl}(ethyl)amino]-N,N,N-trimethylethan-1-aminium chloride

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
426.35 g/molcalc.
Exact mass
425.1385 Dacalc.
LogP (octanol/water)
2.2calc.
Topological polar surface area
71.1 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
5calc.
Rotatable bonds
8calc.
Heavy atoms
28calc.
Rings
2calc.
Aromatic rings
2calc.
Fraction sp3 carbons
0.37calc.
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(N=Nc2ccccc2)cc1

c1ccc(N=Nc2ccccc2)cc1

2 rings, 14 atoms, the Azobenzene ring system.

3,419 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS05: Corrosive
Corrosive
GHS07: Harmful or irritant
Harmful or irritant
GHS09: Hazardous to the environment
Hazardous to the environment

Hazard statements

  • H317May cause an allergic skin reaction.
  • H318Causes serious eye damage.
  • H400Very toxic to aquatic life.
  • H410Very toxic to aquatic life with long lasting effects.
  • H412Harmful to aquatic life with long lasting effects.
Precautionary statements (13)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • 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.
  • 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).
  • P333 + P317If skin irritation or rash occurs: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P391Collect spillage.
  • 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

Basic Red 18 suppliers

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Basic Red 18 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 Basic Red 18 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 Basic Red 18 is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Basic Red 18, based on the data on this page

What is Basic Red 18?

Basic Red 18 is a chemical substance with the molecular formula C19H25Cl2N5O2 and a molar mass of 426.35 g/mol. Its CAS registry number is 25198-22-5. The IUPAC name is 2-[4-[(2-chloro-4-nitrophenyl)diazenyl]-N-ethylanilino]ethyl-trimethylazanium chloride.

What is the CAS number of Basic Red 18?

The CAS registry number of Basic Red 18 is 25198-22-5.

What is the molecular formula and weight of Basic Red 18?

The molecular formula of Basic Red 18 is C19H25Cl2N5O2 and its molar mass is 426.35 g/mol.

What is Basic Red 18 used for?

Known uses and roles of Basic Red 18 include textile dyes in textiles and leather.

Is Basic Red 18 hazardous?

Basic Red 18 carries the GHS signal word "Danger". Main hazards: may cause an allergic skin reaction, causes serious eye damage, very toxic to aquatic life. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Basic Red 18?

Basic Red 18 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 Basic Red 18?

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What is the price of Basic Red 18?

Suppliers quote Basic Red 18 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 Basic Red 18

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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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