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Carboxylic acids and anhydrides

Ioxynic acid

Also known as 4-Hydroxy-3,5-diiodobenzoic acid, 3,5-Diiodo-4-hydroxybenzoic acid, Ioxynil acid

CAS 618-76-8Formula C7H4I2O3Molar mass 389.91 g/molEC 210-562-0
GHS signal word: Warning. Pictograms: Harmful or irritant 2 suppliers listed
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Ioxynic acid chemical structure, C7H4I2O3, CAS 618-76-8
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
618-76-8
Formula
C7H4I2O3
Molar mass
389.91 g/mol
EC number
210-562-0
HS code
291829
Category
Carboxylic acids and anhydrides

What is Ioxynic acid?

Plain description, key identifiers and synonyms

Ioxynic acid is a chemical substance with the molecular formula C7H4I2O3 and a molar mass of 389.91 g/mol. Its CAS registry number is 618-76-8. The IUPAC name is 4-hydroxy-3,5-diiodobenzoic acid.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
4-hydroxy-3,5-diiodobenzoic acid
CAS number
618-76-8 CAS number cross-checked
EC number
210-562-0
Molecular formula
C7H4I2O3
UNII
8C0QV5JK0D
MDL number
MFCD00016532
InChIKey
XREKTVACBXQCSB-UHFFFAOYSA-N
InChI
InChI=1S/C7H4I2O3/c8-4-1-3(7(11)12)2-5(9)6(4)10/h1-2,10H,(H,11,12)
SMILES (canonical and isomeric)
C1=C(C=C(C(=C1I)O)I)C(=O)O

Synonyms

  • 4-Hydroxy-3,5-diiodobenzoic acid
  • 3,5-Diiodo-4-hydroxybenzoic acid
  • Ioxynil acid
  • Benzoic acid, 4-hydroxy-3,5-diiodo-
  • M and B 10903
  • Benzoic acid, 3,5-diiodo-4-hydroxy-
  • M&B-10903
  • 4-Hydroxy-3,5-diiodo-benzoic acid
  • Ioxynil metabolite
  • 4-Hydroxy-3,5-diiodobenzoicacid
  • 3,5-di-iodo-4-hydroxybenzoic acid
  • 3,5-Diiodo-4-hydroxy-benzoic acid

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
389.91 g/molcalc.
Exact mass
389.825 Dacalc.
LogP (octanol/water)
2.3calc.
Topological polar surface area
57.53 Ųcalc.
Hydrogen bond donors
2calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
1calc.
Heavy atoms
12calc.
Rings
1calc.
Aromatic rings
1calc.
Fraction sp3 carbons
0calc.
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, c1ccccc1

c1ccccc1

1 ring, 6 atoms, the Benzene ring system.

485,677 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

Ioxynic acid suppliers

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All 2 suppliers

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Where suppliers are based

2 suppliers in 1 country

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Ioxynic acid 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: Pesticide transformation products.

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Inactive 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 Ioxynic acid is traded under.

HS 2918.29Indicative HS code

Carboxylic acids, (with phenol function but without other oxygen function), their anhydrides, halides…

World exports in 2024
$861M
+0.9% vs 2023, imports $892M
2019 to 2024
Top exporters
  1. China30.5%
  2. South Korea18.3%
  3. Switzerland * partner reported13.3%
Top importers
  1. United States14.7%
  2. Germany13.3%
  3. Japan10.3%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

Quick answers about Ioxynic acid, based on the data on this page

What is Ioxynic acid?

Ioxynic acid is a chemical substance with the molecular formula C7H4I2O3 and a molar mass of 389.91 g/mol. Its CAS registry number is 618-76-8. The IUPAC name is 4-hydroxy-3,5-diiodobenzoic acid.

What is the CAS number of Ioxynic acid?

The CAS registry number of Ioxynic acid is 618-76-8.

What is the molecular formula and weight of Ioxynic acid?

The molecular formula of Ioxynic acid is C7H4I2O3 and its molar mass is 389.91 g/mol.

What is Ioxynic acid used for?

Use classes: Pesticide transformation products.

Is Ioxynic acid hazardous?

Ioxynic acid 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 Ioxynic acid?

Ioxynic acid is usually classified under HS code 291829 (Carboxylic acids with phenol function but without other oxygen function, their…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Ioxynic acid?

CompoundList lists 2 suppliers of Ioxynic acid in China. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Ioxynic acid?

Suppliers quote Ioxynic acid 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 Ioxynic acid

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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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