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Indicators and stains

Ethyl red

Also known as Diethyl red, Ethyl Red [not Cyanin dyes], 2-[[4-(diethylamino)phenyl]diazenyl]benzoic acid

CAS 76058-33-8Formula C17H19N3O2Molar mass 297.36 g/molEC 676-880-0
GHS signal word: Warning. Pictograms: Harmful or irritant 2 suppliers listed
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Ethyl red chemical structure, C17H19N3O2, CAS 76058-33-8
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
76058-33-8
Formula
C17H19N3O2
Molar mass
297.36 g/mol
EC number
676-880-0
HS code
292700
Category
Indicators and stains

What is Ethyl red?

Plain description, key identifiers and synonyms

Ethyl red is a chemical substance with the molecular formula C17H19N3O2 and a molar mass of 297.36 g/mol. Its CAS registry number is 76058-33-8. The IUPAC name is 2-[[4-(diethylamino)phenyl]diazenyl]benzoic acid.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
2-[[4-(diethylamino)phenyl]diazenyl]benzoic acid
CAS number
76058-33-8 CAS number cross-checkedOther or deprecated CAS: 722478-47-9
EC number
676-880-0
Molecular formula
C17H19N3O2
UNII
FTV19WGM7I
MDL number
MFCD00002427
InChIKey
HBRCDTRQDHMTDA-UHFFFAOYSA-N
InChI
InChI=1S/C17H19N3O2/c1-3-20(4-2)14-11-9-13(10-12-14)18-19-16-8-6-5-7-15(16)17(21)22/h5-12H,3-4H2,1-2H3,(H,21,22)
SMILES (canonical and isomeric)
CCN(CC)C1=CC=C(C=C1)N=NC2=CC=CC=C2C(=O)O

Synonyms

  • Diethyl red
  • Ethyl Red [not Cyanin dyes]
  • 2-[[4-(diethylamino)phenyl]diazenyl]benzoic acid
  • 4-Diethylaminoazobenzene-2'-carboxylic acid
  • (E)-2-((4-(diethylamino)phenyl)diazenyl)benzoic acid
  • Benzoic acid, 2-((4-(diethylamino)phenyl)azo)-
  • Benzoic acid, 2-[[4-(diethylamino)phenyl]azo]-
  • Benzoic acid, 2-[2-[4-(diethylamino)phenyl]diazenyl]-
  • Ethyl Red Indicator
  • 2-{[4-(diethylamino)phenyl]diazenyl}benzoic acid
  • Benzoic acid, 2-(2-(4-(diethylamino)phenyl)diazenyl)-
  • Ethyl red, 98%
  • Ethyl red indicator (4.5-6.5)
  • 2-[4-(diethylamino)phenyl]azobenzoic acid
  • 4-(Diethylamino)azobenzene-2'-carboxylic acid
  • 2-(4-(Diethylamino)phenylazo)benzoic acid
  • 2-([4-(Diethylamino)phenyl]diazenyl)benzoic acid #
  • 2-(2-(4-(Diethylamino)phenyl)diazenyl)benzoic acid
  • Benzoic acid, 2-((1E)-(4-(diethylamino)phenyl)azo)-
  • Benzoic acid, 2-((1E)-2-(4-(diethylamino)phenyl)diazenyl)-

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
297.36 g/molcalc.
Exact mass
297.1477 Dacalc.
LogP (octanol/water)
4.65calc.
Topological polar surface area
65.26 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
4calc.
Rotatable bonds
6calc.
Heavy atoms
22calc.
Rings
2calc.
Aromatic rings
2calc.
Fraction sp3 carbons
0.24calc.
Formal charge
0calc.
Stereocentres
0calc.
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, c1ccc(N=Nc2ccccc2)cc1

c1ccc(N=Nc2ccccc2)cc1

2 rings, 14 atoms, the Azobenzene ring system.

3,419 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

  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
Precautionary statements (16)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P332 + P317If skin irritation occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • 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

Ethyl red suppliers

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

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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Ethyl red 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

Regulatory status

Inventories, regulations and trade controls that list this substance

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Ethyl red is traded under.

HS 2927.00Indicative HS code

Diazo-, azo- or azoxy compounds

World exports in 2024
$571M
+6.1% vs 2023, imports $525M
2019 to 2024
Top exporters
  1. China47.0%
  2. Indonesia13.1%
  3. Japan9.3%
Top importers
  1. United States10.2%
  2. India * partner reported9.1%
  3. South Korea9.1%

* Partner reported figures, a lower bound.

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

The HS code shown for Ethyl red is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Ethyl red, based on the data on this page

What is Ethyl red?

Ethyl red is a chemical substance with the molecular formula C17H19N3O2 and a molar mass of 297.36 g/mol. Its CAS registry number is 76058-33-8. The IUPAC name is 2-[[4-(diethylamino)phenyl]diazenyl]benzoic acid.

What is the CAS number of Ethyl red?

The CAS registry number of Ethyl red is 76058-33-8. Other or deprecated CAS numbers: 722478-47-9.

What is the molecular formula and weight of Ethyl red?

The molecular formula of Ethyl red is C17H19N3O2 and its molar mass is 297.36 g/mol.

What is Ethyl red used for?

Known uses and roles of Ethyl red include indicators and stains in research and laboratory.

Is Ethyl red hazardous?

Ethyl red carries the GHS signal word "Warning". Main hazards: causes skin irritation, causes serious eye irritation, may cause respiratory irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Ethyl red?

Ethyl red is usually classified under HS code 292700 (Diazo-, azo- or azoxy-compounds). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Ethyl red?

CompoundList lists 2 suppliers of Ethyl red in India and South Africa. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Ethyl red in India?

1 supplier in India list Ethyl red on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Ethyl red?

Suppliers quote Ethyl red 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 Ethyl red

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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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