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Direct dyes

Direct Red 23

Also known as Fast scarlet 4BSA, Benzo Fast Scarlet 4BS, Chlorazol Fast Scarlet 4B

CAS 3441-14-3Formula C35H25N7Na2O10S2Molar mass 813.74 g/molEC 222-348-4
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Direct Red 23 chemical structure, C35H25N7Na2O10S2, CAS 3441-14-3
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
3441-14-3
Formula
C35H25N7Na2O10S2
Molar mass
813.74 g/mol
EC number
222-348-4
HS code
320414
Category
Direct dyes

What is Direct Red 23?

Plain description, key identifiers and synonyms

Direct Red 23 is a chemical substance with the molecular formula C35H25N7Na2O10S2 and a molar mass of 813.74 g/mol. Its CAS registry number is 3441-14-3. The IUPAC name is disodium, 7-[[6-[(4-acetamidophenyl)diazenyl]-5-hydroxy-7-sulfonatonaphthalen-2-yl]carbamoylamino]-4-hydroxy-3-phenyldiazenylnaphthalene-2-sulfonate.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
disodium, 7-[[6-[(4-acetamidophenyl)diazenyl]-5-hydroxy-7-sulfonatonaphthalen-2-yl]carbamoylamino]-4-hydroxy-3-phenyldiazenylnaphthalene-2-sulfonate
CAS number
3441-14-3 CAS number cross-checkedOther or deprecated CAS: 83232-29-5
EC numbers
222-348-4, 280-261-7
Molecular formula
C35H25N7Na2O10S2
UNII
V7W6L6R35U
INCI name
DIRECT RED 23
InChIKey
NLMHXPDMNXMQBY-UHFFFAOYSA-L
InChI
InChI=1S/C35H27N7O10S2.2Na/c1-19(43)36-22-7-9-24(10-8-22)40-42-32-30(54(50,51)52)18-21-16-26(12-14-28(21)34(32)45)38-35(46)37-25-11-13-27-20(15-25)17-29(53(47,48)49)31(33(27)44)41-39-23-5-3-2-4-6-23;;/h2-18,44-45H,1H3,(H,36,43)(H2,37,38,46)(H,47,48,49)(H,50,51,52);;/q;2*+1/p-2
SMILES (canonical and isomeric)
CC(=O)NC1=CC=C(C=C1)N=NC2=C(C=C3C=C(C=CC3=C2O)NC(=O)NC4=CC5=CC(=C(C(=C5C=C4)O)N=NC6=CC=CC=C6)S(=O)(=O)[O-])S(=O)(=O)[O-].[Na+].[Na+]

Synonyms

  • Fast scarlet 4BSA
  • Benzo Fast Scarlet 4BS
  • Chlorazol Fast Scarlet 4B
  • Scarlet 4BS
  • Direct Scarlet SE
  • Wogenal Scarlet CB
  • Benzo Fast Scarlet 4BSA-CF
  • Benzo Scarlet 4BS
  • Libia Scarlet 4BS
  • Paper Scarlet 4BS
  • Red EMB
  • Red EMBL
  • Diphenyl Scarlet RS
  • Fast Red 4BS
  • Direct Scarlet 4BS
  • Orbamin Scarlet 4BS
  • Airedale Scarlet 4BD
  • Vondacel Scarlet 4BS
  • Erie Fast Scarlet SCB
  • Calcomine Scarlet 4BSY
  • Direct Fast Scarlet SE
  • Direct Scarlet Lightfast
  • Direct Fast Scarlet 4B
  • Tetrodirect Scarlet 4BS
  • Brilliant Direct Red 4A
Show all 39 synonyms
  • Direct Brilliant Red 4A
  • Tertrodirect Scarlet 4BS
  • Amanil Fast Scarlet 4BS
  • Diazol Fast Scarlet 4BS
  • Diphenyl Fast Scarlet RS
  • Nippon Fast Scarlet 4BS
  • Pheno Fast Scarlet 4BSY
  • C.I. Direct Red 23, disodium salt
  • Chrome Leather Scarlet SE
  • Diamine Fast Scarlet 4BA
  • Diamine Fast Scarlet 4BS
  • Enianil Fast Scarlet 4BS
  • Fenamin Fast Scarlet 4BS
  • Direct Fast Scarlet 4BSN

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
813.74 g/molcalc.
Exact mass
813.09 Dacalc.
LogP (octanol/water)
1.65calc.
Topological polar surface area
274.5 Ųcalc.
Hydrogen bond donors
5calc.
Hydrogen bond acceptors
14calc.
Rotatable bonds
9calc.
Heavy atoms
56calc.
Rings
6calc.
Aromatic rings
6calc.
Fraction sp3 carbons
0.03calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
3calc.
Lipinski rule of five
Fails (2 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, O=C(Nc1ccc2cc(N=Nc3ccccc3)ccc2c1)Nc1ccc2cc(N=Nc3ccccc3)ccc2c1

O=C(Nc1ccc2cc(N=Nc3ccccc3)ccc2c1)Nc1ccc2cc(N=Nc3ccccc3)ccc2c1

6 rings, 40 atoms.

90 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.

Direct Red 23 suppliers

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

All 25 suppliers
25 of 25 offers

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

25 suppliers in 4 countries

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Direct Red 23 price

Indicative price range per kg from live supplier offers

No published prices right now

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

Use classes: Cosmetics.

Cosmetic ingredient, INCI name DIRECT RED 23(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: 3-[(4-(Acetylamino)phenyl)azo]-4-hydroxy-7-[[[[5-hydroxy-6-(phenylazo)-7-sulfo-2-naphthalenyl]amino]carbonyl]amino]-2-naphthalenesulfonic acid and its sa…

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 Direct Red 23 is traded under.

HS 3204.14Indicative HS code

Direct dyes and preparations based thereon

World exports in 2024
$328M
−1.5% vs 2023, imports $336M
2019 to 2024
Top exporters
  1. India * partner reported34.9%
  2. China11.3%
  3. Spain9.0%
Top importers
  1. Italy9.8%
  2. Germany8.7%
  3. Netherlands7.8%

* Partner reported figures, a lower bound.

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

The HS code shown for Direct Red 23 is indicative (it is known at chapter level only). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Direct Red 23, based on the data on this page

What is Direct Red 23?

Direct Red 23 is a chemical substance with the molecular formula C35H25N7Na2O10S2 and a molar mass of 813.74 g/mol. Its CAS registry number is 3441-14-3.

What is the CAS number of Direct Red 23?

The CAS registry number of Direct Red 23 is 3441-14-3. Other or deprecated CAS numbers: 83232-29-5.

What is the molecular formula and weight of Direct Red 23?

The molecular formula of Direct Red 23 is C35H25N7Na2O10S2 and its molar mass is 813.74 g/mol.

What is Direct Red 23 used for?

Use classes: Cosmetics.

Is Direct Red 23 hazardous?

No GHS hazard classification for Direct Red 23 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 Direct Red 23?

Direct Red 23 is usually classified under HS code 320414 (Direct dyes and preparations based thereon). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Direct Red 23?

CompoundList lists 25 suppliers of Direct Red 23 in India, China, United States and United Arab Emirates. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Direct Red 23 in India?

15 suppliers in India list Direct Red 23 on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Direct Red 23?

Suppliers quote Direct Red 23 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 Direct Red 23

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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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