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Basic and cationic dyes

Basic Yellow 11

Also known as C.I. Basic Yellow 11, C.I. 48055, C.I. Basic Yellow 18

CAS 4208-80-4Formula C21H25ClN2O2Molar mass 372.90 g/molEC 224-132-5
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Basic Yellow 11 chemical structure, C21H25ClN2O2, CAS 4208-80-4
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
4208-80-4
Formula
C21H25ClN2O2
Molar mass
372.90 g/mol
EC number
224-132-5
HS code
320413
Category
Basic and cationic dyes

What is Basic Yellow 11?

Plain description, key identifiers and synonyms

Basic Yellow 11 is a chemical substance with the molecular formula C21H25ClN2O2 and a molar mass of 372.90 g/mol. Its CAS registry number is 4208-80-4. The IUPAC name is 2,4-dimethoxy-N-[(E)-2-(1,3,3-trimethylindol-1-ium-2-yl)ethenyl]aniline chloride.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
2,4-dimethoxy-N-[(E)-2-(1,3,3-trimethylindol-1-ium-2-yl)ethenyl]aniline chloride
CAS number
4208-80-4 CAS number cross-checked
EC number
224-132-5
Molecular formula
C21H25ClN2O2
UNII
10AEA58N54
INCI name
BASIC YELLOW 11
InChIKey
QAMCXJOYXRSXDU-UHFFFAOYSA-N
InChI
InChI=1S/C21H24N2O2.ClH/c1-21(2)16-8-6-7-9-18(16)23(3)20(21)12-13-22-17-11-10-15(24-4)14-19(17)25-5;/h6-14H,1-5H3;1H
Canonical SMILES
COc1ccc(NC=CC2=[N+](C)c3ccccc3C2(C)C)c(OC)c1.[Cl-]
Isomeric SMILES
CC1(C2=CC=CC=C2[N+](=C1/C=C/NC3=C(C=C(C=C3)OC)OC)C)C.[Cl-]

Synonyms

  • C.I. Basic Yellow 11
  • C.I. 48055
  • C.I. Basic Yellow 18
  • Basic dye BY11
  • Lowacryl yellow 11
  • 2-(2-(2,4-Dimethoxyanilino)vinyl)-1,3,3-trimethyl-3H-indolium chloride
  • 3H-Indolium, 2-(2-((2,4-dimethoxyphenyl)amino)ethenyl)-1,3,3-trimethyl-, chloride (1:1)
  • Sevron Yellow R
  • Sevron Yellow 1
  • Nabor Yellow 4G
  • Sumiacryl Yellow G
  • Astrazon Yellow 3G
  • Genacryl Yellow 3G
  • Genacryl Yellow 4G
  • Sumiacryl Yellow 3G
  • Astrazon Yellow 3GL
  • Panacryl Yellow 3GL
  • Sandocryl Yellow BGL
  • Aizen Cathilon Yellow 3GH
  • Aizen Cathilon Yellow 3GL
  • Aizen Cathilon Yellow 3GLH
  • Basicyellow11
  • C.I. No. 48055
  • 2,4-dimethoxy-N-[(E)-2-(1,3,3-trimethylindol-1-ium-2-yl)ethenyl]aniline, chloride
  • Aizen Cathion Yellow 3GL
Show all 37 synonyms
  • Atacryl Yellow 4G
  • Deorlene Yellow 2G
  • Yoracryl Yellow 4G
  • Maxilon Yellow 3GL
  • Atacryl Yellow 4G-FS
  • Aizen Cathion Yellow 3GH
  • Aizen Cathion Yellow 3GLH
  • 2-(2-((2,4-Dimethoxyphenyl)amino)ethenyl)-1,3,3-trimethyl-3H-indolium chloride
  • 1,3,3-Trimethyl-2-(2-(2,4-dimethoxyphenylamino)vinyl)indolium chloride
  • 2-(2-((2,4-Dimethoxyphenyl)amino)vinyl)-1,3,3-trimethyl-3H-indolium chloride
  • 3H-Indolium, 2-(2-(2,4-dimethoxyanilino)vinyl)-1,3,3-trimethyl-, chloride
  • 3H-Indolium, 2-(2-((2,4-dimethoxyphenyl)amino)ethenyl)-1,3,3-trimethyl-, 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
372.90 g/molcalc.
Exact mass
372.1605 Dacalc.
LogP (octanol/water)
1.34calc.
Topological polar surface area
33.5 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
5calc.
Heavy atoms
26calc.
Rings
3calc.
Aromatic rings
2calc.
Fraction sp3 carbons
0.29calc.
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, C(=CC1=Nc2ccccc2C1)Nc1ccccc1

C(=CC1=Nc2ccccc2C1)Nc1ccccc1

3 rings, 18 atoms.

25 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.

Basic Yellow 11 suppliers

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Basic Yellow 11 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

Use classes: Cosmetics.

Cosmetic ingredient, INCI name BASIC YELLOW 11(hair dyeing)

Functional uses

  • Dye

Cosmetic functions

  • Hair dyeing

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • EU cosmetic ingredient inventory
  • EU Cosmetics Regulation Annex II, prohibited in cosmetics
    Name: 3H-Indolium, 2-(2-((2,4-dimethoxyphenyl)amino)ethenyl]-1,3,3-trimethyl- and its salts, when used as a substance in hair dye products, Ref no: 1273, Annex…

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 Yellow 11 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 Yellow 11 is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Basic Yellow 11, based on the data on this page

What is Basic Yellow 11?

Basic Yellow 11 is a chemical substance with the molecular formula C21H25ClN2O2 and a molar mass of 372.90 g/mol. Its CAS registry number is 4208-80-4. The IUPAC name is 2,4-dimethoxy-N-[(E)-2-(1,3,3-trimethylindol-1-ium-2-yl)ethenyl]aniline chloride.

What is the CAS number of Basic Yellow 11?

The CAS registry number of Basic Yellow 11 is 4208-80-4.

What is the molecular formula and weight of Basic Yellow 11?

The molecular formula of Basic Yellow 11 is C21H25ClN2O2 and its molar mass is 372.90 g/mol.

What is Basic Yellow 11 used for?

Use classes: Cosmetics.

Is Basic Yellow 11 hazardous?

No GHS hazard classification for Basic Yellow 11 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 Basic Yellow 11?

Basic Yellow 11 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 Yellow 11?

Post a free request on CompoundList and suppliers of Basic Yellow 11 will send you quotes. Your contact details stay private until you accept a quote.

What is the price of Basic Yellow 11?

Suppliers quote Basic Yellow 11 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 Yellow 11

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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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