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Acid and mordant dyes

Tropaeolin OO

Also known as Orange IV, OrangeIV, Acid Orange 5

CAS 554-73-4Formula C18H14N3NaO3SMolar mass 375.39 g/molEC 209-071-4
GHS signal word: Warning. Pictograms: Harmful or irritant 6 suppliers listed
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Tropaeolin OO chemical structure, C18H14N3NaO3S, CAS 554-73-4
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
554-73-4
Formula
C18H14N3NaO3S
Molar mass
375.39 g/mol
EC number
209-071-4
HS code
320412
Category
Acid and mordant dyes

What is Tropaeolin OO?

Plain description, key identifiers and synonyms

Tropaeolin OO is a chemical substance with the molecular formula C18H14N3NaO3S and a molar mass of 375.39 g/mol. Its CAS registry number is 554-73-4. The IUPAC name is sodium 4-[(4-anilinophenyl)diazenyl]benzenesulfonate.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
sodium 4-[(4-anilinophenyl)diazenyl]benzenesulfonate
CAS number
554-73-4 CAS number cross-checked
EC number
209-071-4
Molecular formula
C18H14N3NaO3S
UNII
VR8Q3R288W
MDL number
MFCD00038130
InChIKey
MLVYOYVMOZFHIU-UHFFFAOYSA-M
InChI
InChI=1S/C18H15N3O3S.Na/c22-25(23,24)18-12-10-17(11-13-18)21-20-16-8-6-15(7-9-16)19-14-4-2-1-3-5-14;/h1-13,19H,(H,22,23,24);/q;+1/p-1
SMILES (canonical and isomeric)
C1=CC=C(C=C1)NC2=CC=C(C=C2)N=NC3=CC=C(C=C3)S(=O)(=O)[O-].[Na+]

Synonyms

  • Orange IV
  • OrangeIV
  • Acid Orange 5
  • Diphenylamine Orange
  • C.I. Acid Orange 5
  • Orange GS
  • Tropaeolin
  • C.I. 13080
  • Tropeolin OO
  • Orange N
  • Solar Orange IV
  • Acid Yellow D
  • Orange 4 Lake
  • Hispacid Orange IV
  • Tertracid Orange IV
  • Benzenesulfonic acid, 4-[[4-(phenylamino)phenyl]azo]-, monosodiumsalt
  • sodium, 4-[(4-anilinophenyl)diazenyl]benzenesulfonate
  • Sodium p-diphenylamino-azobenzenesulfonate
  • Benzenesulfonic acid, 4-((4-(phenylamino)phenyl)azo)-, monosodium salt
  • Benzenesulfonic acid, 4-[[4-(phenylamino)phenyl]azo]-, monosodium salt
  • C.I. Acid Orange 5, monosodium salt
  • 4-{[4-(phenylamino)phenyl]diazenyl}benzenesulfonic acid, sodium salt
  • Benzenesulfonicacid,4-[[4-(phenylamino)phenyl]azo]-,monosodiumsalt
  • Sodium 4-[(4-anilinophenyl)diazenyl]-benzenesulfonate
  • Tropaeolin OO Indicator
Show all 35 synonyms
  • Acid Orange V monosodium salt
  • 4-(4-Anilinophenylazo)benzenesulfonic acid sodium salt
  • Benzenesulfonic acid, p-((p-anilinophenyl)azo)-, sodium salt
  • Benzenesulfonic acid, p-((p-anilinophenyl)azo)-, monosodium salt
  • CI 138
  • sodium, 4-(4-anilinophenyl)azobenzenesulfonate
  • Sodium 4-((4-(anilino)phenyl)azo)benzenesulphonate
  • Sodium 4-[(4-anilinophenyl)diazenyl]benzene-1-sulfonate
  • Sodium 4-((4-(phenylamino)phenyl)diazenyl)benzenesulfonate
  • 4-(2-(4-(Phenylamino)phenyl)diazenyl)benzenesulfonic acid sodium salt (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
375.39 g/molcalc.
Exact mass
375.0654 Dacalc.
LogP (octanol/water)
1.75calc.
Topological polar surface area
93.95 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
6calc.
Rotatable bonds
5calc.
Heavy atoms
26calc.
Rings
3calc.
Aromatic rings
3calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
2calc.
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=Nc2ccc(Nc3ccccc3)cc2)cc1

c1ccc(N=Nc2ccc(Nc3ccccc3)cc2)cc1

3 rings, 21 atoms, the 4-Benzeneazodiphenylamine ring system.

63 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

Tropaeolin OO suppliers

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Where suppliers are based

6 suppliers in 1 country

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Tropaeolin OO price

Indicative price range per kg from live supplier offers

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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

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 Tropaeolin OO is traded under.

HS 3204.12Indicative HS code

Acid dyes, whether or not premetallised, and preparations based thereon, mordant dyes…

World exports in 2024
$792M
+6.2% vs 2023, imports $791M
2019 to 2024
Top exporters
  1. India * partner reported34.9%
  2. China9.3%
  3. Germany7.4%
Top importers
  1. China15.3%
  2. Italy8.2%
  3. United States7.3%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

Quick answers about Tropaeolin OO, based on the data on this page

What is Tropaeolin OO?

Tropaeolin OO is a chemical substance with the molecular formula C18H14N3NaO3S and a molar mass of 375.39 g/mol. Its CAS registry number is 554-73-4. The IUPAC name is sodium 4-[(4-anilinophenyl)diazenyl]benzenesulfonate.

What is the CAS number of Tropaeolin OO?

The CAS registry number of Tropaeolin OO is 554-73-4.

What is the molecular formula and weight of Tropaeolin OO?

The molecular formula of Tropaeolin OO is C18H14N3NaO3S and its molar mass is 375.39 g/mol.

What is Tropaeolin OO used for?

Known uses and roles of Tropaeolin OO include textile dyes in textiles and leather and indicators and stains in research and laboratory.

Is Tropaeolin OO hazardous?

Tropaeolin OO 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 Tropaeolin OO?

Tropaeolin OO is usually classified under HS code 320412 (Acid dyes, whether or not premetallised, and preparations based thereon, mordant dyes…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Tropaeolin OO?

CompoundList lists 6 suppliers of Tropaeolin OO in India. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Tropaeolin OO in India?

5 suppliers in India list Tropaeolin OO on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Tropaeolin OO?

Suppliers quote Tropaeolin OO 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

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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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