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Basic and cationic dyes

Basic Violet 21

Also known as Vpm chloride, violet polymethine dye, 2-(4-(N-methyl-p-phenetidinyl)phenyl)ethenyl-6-methoxycarbonyl-1,3,3-trimethyl-3H-indolium chloride

CAS 6441-84-5Formula C30H33ClN2O3Molar mass 505.06 g/molEC 229-228-0
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Basic Violet 21 chemical structure, C30H33ClN2O3, CAS 6441-84-5
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
6441-84-5
Formula
C30H33ClN2O3
Molar mass
505.06 g/mol
EC number
229-228-0
HS code
320413
Category
Basic and cationic dyes

What is Basic Violet 21?

Plain description, key identifiers and synonyms

Basic Violet 21 is a chemical substance with the molecular formula C30H33ClN2O3 and a molar mass of 505.06 g/mol. Its CAS registry number is 6441-84-5. The IUPAC name is methyl 2-[(E)-2-[4-(4-ethoxy-N-methylanilino)phenyl]ethenyl]-1,3,3-trimethylindol-1-ium-5-carboxylate chloride.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
methyl 2-[(E)-2-[4-(4-ethoxy-N-methylanilino)phenyl]ethenyl]-1,3,3-trimethylindol-1-ium-5-carboxylate chloride
CAS number
6441-84-5 CAS number cross-checked
EC number
229-228-0
Molecular formula
C30H33ClN2O3
InChIKey
QDJBQLCGQZTYIE-UHFFFAOYSA-M
InChI
InChI=1S/C30H33N2O3.ClH/c1-7-35-25-16-14-24(15-17-25)31(4)23-12-8-21(9-13-23)10-19-28-30(2,3)26-20-22(29(33)34-6)11-18-27(26)32(28)5;/h8-20H,7H2,1-6H3;1H/q+1;/p-1
Canonical SMILES
CCOc1ccc(N(C)c2ccc(C=CC3=[N+](C)c4ccc(C(=O)OC)cc4C3(C)C)cc2)cc1.[Cl-]
Isomeric SMILES
CCOC1=CC=C(C=C1)N(C)C2=CC=C(C=C2)/C=C/C3=[N+](C4=C(C3(C)C)C=C(C=C4)C(=O)OC)C.[Cl-]

Synonyms

  • Vpm chloride
  • violet polymethine dye
  • 2-(4-(N-methyl-p-phenetidinyl)phenyl)ethenyl-6-methoxycarbonyl-1,3,3-trimethyl-3H-indolium chloride
  • 3H-Indolium, 2-[2-[4-[(4-ethoxyphenyl)methylamino]phenyl]ethenyl]-5-(methoxycarbonyl)-1,3,3-trimethyl-, chloride
  • 3H-Indolium, 2-(2-(4-((4-ethoxyphenyl)methylamino)phenyl)ethenyl)-5-(methoxycarbonyl)-1,3,3-trimethyl-, chloride
  • 2-(2-(4-((4-Ethoxyphenyl)methylamino)phenyl)ethenyl)-5-(methoxycarbonyl)-1,3,3-trimethyl-3H-indolium, chloride
  • methyl 2-[(E)-2-[4-(4-ethoxy-N-methylanilino)phenyl]ethenyl]-1,3,3-trimethylindol-1-ium-5-carboxylate, chloride
  • 2-(2-(4-((4-Ethoxyphenyl)methylamino)phenyl)vinyl)-5-(methoxycarbonyl)-1,3,3-trimethyl-3H-indolium chloride
  • 2-(2-{4-[(4-Ethoxyphenyl)(methyl)amino]phenyl}ethenyl)-5-(methoxycarbonyl)-1,3,3-trimethyl-3H-indol-1-ium chloride
  • 2-[(E)-2-{4-[(4-Ethoxyphenyl)(methyl)amino]phenyl}ethen-1-yl]-5-(methoxycarbonyl)-1,3,3-trimethyl-3H-indol-1-ium chloride
  • 3H-Indolium, 2-(2-(4-((4-ethoxyphenyl)methylamino)phenyl)ethenyl)-5-(methoxycarbonyl)-1,3,3-trimethyl-, chloride (1:1)

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
505.06 g/molcalc.
Exact mass
504.218 Dacalc.
LogP (octanol/water)
3.36calc.
Topological polar surface area
41.78 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
4calc.
Rotatable bonds
7calc.
Heavy atoms
36calc.
Rings
4calc.
Aromatic rings
3calc.
Fraction sp3 carbons
0.27calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
2calc.
Lipinski rule of five
Passes (1 violation)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(=Cc1ccc(Nc2ccccc2)cc1)C1=Nc2ccccc2C1

C(=Cc1ccc(Nc2ccccc2)cc1)C1=Nc2ccccc2C1

4 rings, 24 atoms.

5 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 Violet 21 suppliers

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Basic Violet 21 price

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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: Inactive 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 Violet 21 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 Violet 21 is indicative (it is known at chapter level only). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Basic Violet 21, based on the data on this page

What is Basic Violet 21?

Basic Violet 21 is a chemical substance with the molecular formula C30H33ClN2O3 and a molar mass of 505.06 g/mol. Its CAS registry number is 6441-84-5. The IUPAC name is methyl 2-[(E)-2-[4-(4-ethoxy-N-methylanilino)phenyl]ethenyl]-1,3,3-trimethylindol-1-ium-5-carboxylate chloride.

What is the CAS number of Basic Violet 21?

The CAS registry number of Basic Violet 21 is 6441-84-5.

What is the molecular formula and weight of Basic Violet 21?

The molecular formula of Basic Violet 21 is C30H33ClN2O3 and its molar mass is 505.06 g/mol.

What is Basic Violet 21 used for?

Known uses and roles of Basic Violet 21 include textile dyes in textiles and leather.

Is Basic Violet 21 hazardous?

No GHS hazard classification for Basic Violet 21 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 Violet 21?

Basic Violet 21 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 Violet 21?

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What is the price of Basic Violet 21?

Suppliers quote Basic Violet 21 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 Violet 21

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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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