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Direct dyes

Direct Red 75

Also known as C.I. Direct Red 75, DR75 dye, direct red 75 tetrasodium salt

CAS 2829-43-8Formula C33H22N8Na4O15S4Molar mass 990.81 g/molEC 220-593-1
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Direct Red 75 chemical structure, C33H22N8Na4O15S4, CAS 2829-43-8
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
2829-43-8
Formula
C33H22N8Na4O15S4
Molar mass
990.81 g/mol
EC number
220-593-1
HS code
320414
Category
Direct dyes

What is Direct Red 75?

Plain description, key identifiers and synonyms

Direct Red 75 is a chemical substance with the molecular formula C33H22N8Na4O15S4 and a molar mass of 990.81 g/mol. Its CAS registry number is 2829-43-8. The IUPAC name is tetrasodium, 6-amino-5-[[4-[[4-[(2-amino-8-hydroxy-6-sulfonatonaphthalen-1-yl)diazenyl]-3-sulfonatophenyl]carbamoylamino]-2-sulfonatophenyl]diazenyl]-4-hydroxynaphthalene-2-sulfonate.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
tetrasodium, 6-amino-5-[[4-[[4-[(2-amino-8-hydroxy-6-sulfonatonaphthalen-1-yl)diazenyl]-3-sulfonatophenyl]carbamoylamino]-2-sulfonatophenyl]diazenyl]-4-hydroxynaphthalene-2-sulfonate
CAS number
2829-43-8 CAS number cross-checked
EC number
220-593-1
Molecular formula
C33H22N8Na4O15S4
InChIKey
ZXRQHEAKVNYRIS-UHFFFAOYSA-J
InChI
InChI=1S/C33H26N8O15S4.4Na/c34-21-5-1-15-9-19(57(45,46)47)13-25(42)29(15)31(21)40-38-23-7-3-17(11-27(23)59(51,52)53)36-33(44)37-18-4-8-24(28(12-18)60(54,55)56)39-41-32-22(35)6-2-16-10-20(58(48,49)50)14-26(43)30(16)32;;;;/h1-14,42-43H,34-35H2,(H2,36,37,44)(H,45,46,47)(H,48,49,50)(H,51,52,53)(H,54,55,56);;;;/q;4*+1/p-4
SMILES (canonical and isomeric)
C1=CC(=C(C2=C(C=C(C=C21)S(=O)(=O)[O-])O)N=NC3=C(C=C(C=C3)NC(=O)NC4=CC(=C(C=C4)N=NC5=C(C=CC6=CC(=CC(=C65)O)S(=O)(=O)[O-])N)S(=O)(=O)[O-])S(=O)(=O)[O-])N.[Na+].[Na+].[Na+].[Na+]

Synonyms

  • C.I. Direct Red 75
  • DR75 dye
  • direct red 75 tetrasodium salt
  • Vitalnewred
  • Benzo Fast Pink 2 BL
  • Tetrasodium 5,5'-{carbonylbis[azanediyl(2-sulfonato-4,1-phenylene)diazene-2,1-diyl]}bis(6-amino-4-hydroxynaphthalene-2-sulfonate)

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
990.81 g/molcalc.
Exact mass
989.9678 Dacalc.
LogP (octanol/water)
-7.32calc.
Topological polar surface area
411.9 Ųcalc.
Hydrogen bond donors
6calc.
Hydrogen bond acceptors
21calc.
Rotatable bonds
10calc.
Heavy atoms
64calc.
Rings
6calc.
Aromatic rings
6calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
5calc.
Lipinski rule of five
Fails (3 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(Nc1ccc(N=Nc2cccc3ccccc23)cc1)Nc1ccc(N=Nc2cccc3ccccc23)cc1

O=C(Nc1ccc(N=Nc2cccc3ccccc23)cc1)Nc1ccc(N=Nc2cccc3ccccc23)cc1

6 rings, 40 atoms.

16 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 75 suppliers

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All 2 suppliers

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

2 suppliers in 2 countries

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Direct Red 75 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

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 Direct Red 75 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 75 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 75, based on the data on this page

What is Direct Red 75?

Direct Red 75 is a chemical substance with the molecular formula C33H22N8Na4O15S4 and a molar mass of 990.81 g/mol. Its CAS registry number is 2829-43-8.

What is the CAS number of Direct Red 75?

The CAS registry number of Direct Red 75 is 2829-43-8.

What is the molecular formula and weight of Direct Red 75?

The molecular formula of Direct Red 75 is C33H22N8Na4O15S4 and its molar mass is 990.81 g/mol.

What is Direct Red 75 used for?

Known uses and roles of Direct Red 75 include textile dyes in textiles and leather.

Is Direct Red 75 hazardous?

No GHS hazard classification for Direct Red 75 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 75?

Direct Red 75 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 75?

CompoundList lists 2 suppliers of Direct Red 75 in China and India. 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 75 in India?

1 supplier in India list Direct Red 75 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 75?

Suppliers quote Direct Red 75 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 75

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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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