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Basic and cationic dyes

Basic Brown 4

Also known as Bismarck Brown R, Bismark Brown R, Astra Vesuvine B

CAS 8005-78-5Formula C21H26Cl2N8Molar mass 461.40 g/molEC 224-764-1
GHS signal word: Warning. Pictograms: Harmful or irritant 15 suppliers listed
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Basic Brown 4 chemical structure, C21H26Cl2N8, CAS 8005-78-5
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
8005-78-5
Formula
C21H26Cl2N8
Molar mass
461.40 g/mol
EC number
224-764-1
HS code
320413
Category
Basic and cationic dyes

What is Basic Brown 4?

Plain description, key identifiers and synonyms

Basic Brown 4 is a chemical substance with the molecular formula C21H26Cl2N8 and a molar mass of 461.40 g/mol. Its CAS registry number is 8005-78-5. The IUPAC name is 4-[[3-[(2,4-diamino-5-methylphenyl)diazenyl]-4-methylphenyl]diazenyl]-6-methylbenzene-1,3-diamine, dihydrochloride.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
4-[[3-[(2,4-diamino-5-methylphenyl)diazenyl]-4-methylphenyl]diazenyl]-6-methylbenzene-1,3-diamine, dihydrochloride
CAS number
8005-78-5 CAS number cross-checkedOther or deprecated CAS: 1071662-01-5, 5421-66-9, 8052-76-4
EC numbers
224-764-1, 226-541-4, 232-341-8, 617-110-5
Molecular formula
C21H26Cl2N8
UNII
1HAD3F3XM9
MDL number
MFCD00036386
InChIKey
WLKAMFOFXYCYDK-UHFFFAOYSA-N
InChI
InChI=1S/C21H24N8.2ClH/c1-11-4-5-14(26-28-20-6-12(2)15(22)9-17(20)24)8-19(11)27-29-21-7-13(3)16(23)10-18(21)25;;/h4-10H,22-25H2,1-3H3;2*1H
SMILES (canonical and isomeric)
CC1=C(C=C(C=C1)N=NC2=C(C=C(C(=C2)C)N)N)N=NC3=C(C=C(C(=C3)C)N)N.Cl.Cl

Synonyms

  • Bismarck Brown R
  • Bismark Brown R
  • Astra Vesuvine B
  • Basic Brown 2K
  • C.I. 21010
  • C.I. BASIC BROWN 4
  • 2,4-Bis(2,4-diamino-5-methyl-1-benzenazo)toluene
  • Vesuvine
  • Lowacryl brown 4
  • Bismark brown 53
  • C.I. Basic Brown 4, dihydrochloride
  • Bismarck Brown TSS
  • Bismarck Brown RLNS
  • 1,3-Benzenediamine, 4,4'-((4-methyl-1,3-phenylene)bis(azo))bis(6-methyl-, dihydrochloride
  • 1,3-Benzenediamine, 4,4'-[(4-methyl-1,3-phenylene)bis(azo)]bis[6-methyl-, dihydrochloride
  • 1,3-Benzenediamine, 4,4'-((4-methyl-1,3-phenylene)bis(2,1-diazenediyl))bis(6-methyl-, hydrochloride (1:2)
  • 5,5'-((4-Methyl-m-phenylene)bis(azo))bis(toluene-2,4-diamine) dihydrochloride
  • 4,4'-((4-Methyl-1,3-phenylene)bis(azo))bis(6-methyl-1,3-benzenediamine) dihydrochloride
  • CI 21010
  • 1,3-Benzenediamine, 4,4'-[(4-methyl-1,3-phenylene)bis(2,1-diazenediyl)]bis[6-methyl-, hydrochloride (1:2)
  • C.I. Basic Brown 4, dihydrochloride (8CI)
  • C.I. Basic Brown 4 (8CI)
  • 4,4'-((4-Methyl-1,3-phenylene)bis(azo))bis(6-methyl-1,3-benzenedi-amine
  • Bismarck Brown Base
  • 4-(2-{5-[2-(2,4-diamino-5-methylphenyl)diazen-1-yl]-2-methylphenyl}diazen-1-yl)-6-methylbenzene-1,3-diamine dihydrochloride
Show all 34 synonyms
  • 6,6'-((1E,1'E)-(4-methyl-1,3-phenylene)bis(diazene-2,1-diyl))bis(4-methylbenzene-1,3-diamine) dihydrochloride
  • C.I.Basic Brown 5
  • 4-[[3-[(2,4-diamino-5-methylphenyl)diazenyl]-4-methylphenyl]diazenyl]-6-methylbenzene-1,3-diamine, dihydrochloride
  • Bismark Brown Rfor Microscopy
  • Bismark Brown (C.I. 21010)
  • Bismarck Brown R, for microscopy (Bact., Hist.)
  • [5-amino-4-[[3-[(2-amino-4-azaniumyl-5-methylphenyl)diazenyl]-4-methylphenyl]diazenyl]-2-methylphenyl]azanium,dichloride
  • 1,3-Benzenediamine, 4,4'-[(4-methyl-1,3-phenylene)di(E)-2,1-diazenediyl]bis[6-methyl-, hydrochloride (1:2)
  • 4,4'-[(4-Methyl-1,3-phenylene)bis(diazene-2,1-diyl)]bis(6-methylbenzene-1,3-diamine)--hydrogen chloride (1/2)

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
461.40 g/molcalc.
Exact mass
460.1657 Dacalc.
LogP (octanol/water)
6.62calc.
Topological polar surface area
153.5 Ųcalc.
Hydrogen bond donors
4calc.
Hydrogen bond acceptors
8calc.
Rotatable bonds
4calc.
Heavy atoms
31calc.
Rings
3calc.
Aromatic rings
3calc.
Fraction sp3 carbons
0.14calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
3calc.
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, c1ccc(N=Nc2cccc(N=Nc3ccccc3)c2)cc1

c1ccc(N=Nc2cccc(N=Nc3ccccc3)c2)cc1

3 rings, 22 atoms.

102 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

  • H312Harmful in contact with skin.
  • H315Causes skin irritation.
Precautionary statements (8)
  • P264Wash skin thoroughly after handling.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P317Get medical help.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P332 + P317If skin irritation occurs: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • 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 Brown 4 suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 15 suppliers
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Where suppliers are based

15 suppliers in 3 countries

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Basic Brown 4 price

Indicative price range per kg from live supplier offers

No published prices right now

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Uses and applications

What the substance is used for, by industry and function

Use classes: Cosmetics.

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 Brown 4 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 Brown 4 is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Basic Brown 4, based on the data on this page

What is Basic Brown 4?

Basic Brown 4 is a chemical substance with the molecular formula C21H26Cl2N8 and a molar mass of 461.40 g/mol. Its CAS registry number is 8005-78-5. The IUPAC name is 4-[[3-[(2,4-diamino-5-methylphenyl)diazenyl]-4-methylphenyl]diazenyl]-6-methylbenzene-1,3-diamine, dihydrochloride.

What is the CAS number of Basic Brown 4?

The CAS registry number of Basic Brown 4 is 8005-78-5. Other or deprecated CAS numbers: 1071662-01-5, 5421-66-9, 8052-76-4.

What is the molecular formula and weight of Basic Brown 4?

The molecular formula of Basic Brown 4 is C21H26Cl2N8 and its molar mass is 461.40 g/mol.

What is Basic Brown 4 used for?

Use classes: Cosmetics.

Is Basic Brown 4 hazardous?

Basic Brown 4 carries the GHS signal word "Warning". Main hazards: harmful in contact with skin, causes skin irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Basic Brown 4?

Basic Brown 4 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 Brown 4?

CompoundList lists 15 suppliers of Basic Brown 4 in India, China and United States. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Basic Brown 4 in India?

11 suppliers in India list Basic Brown 4 on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Basic Brown 4?

Suppliers quote Basic Brown 4 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 Brown 4

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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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