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Screening compounds

Thoron (reagent)

Also known as 2,7-Naphthalenedisulfonic acid, 4-[(2-arsonophenyl)azo]-3-hydroxy-, 2,7-Naphthalenedisulfonic acid, 4-((2-arsonophenyl)azo)-3-hydroxy-, 4-((2-Arsonophenyl)azo)-3-hydroxy-2,7-naphthalenedisulfonic acid

CAS 132-33-2Formula C16H13AsN2O10S2Molar mass 532.34 g/molEC 205-058-2
GHS signal word: Danger. Pictograms: Acute toxicity (severe), Hazardous to the environment
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Thoron (reagent) chemical structure, C16H13AsN2O10S2, CAS 132-33-2
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
132-33-2
Formula
C16H13AsN2O10S2
Molar mass
532.34 g/mol
EC number
205-058-2
HS code
293190
Category
Screening compounds

What is Thoron (reagent)?

Plain description, key identifiers and synonyms

Thoron (reagent) is a chemical substance with the molecular formula C16H13AsN2O10S2 and a molar mass of 532.34 g/mol. Its CAS registry number is 132-33-2. The IUPAC name is 4-[(2-arsonophenyl)diazenyl]-3-hydroxynaphthalene-2,7-disulfonic acid.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
4-[(2-arsonophenyl)diazenyl]-3-hydroxynaphthalene-2,7-disulfonic acid
CAS number
132-33-2 CAS number cross-checked
EC number
205-058-2
Molecular formula
C16H13AsN2O10S2
UNII
622F4KNW84
InChIKey
XQVKLMRIZCRVPO-UHFFFAOYSA-N
InChI
InChI=1S/C16H13AsN2O10S2/c20-16-14(31(27,28)29)8-9-7-10(30(24,25)26)5-6-11(9)15(16)19-18-13-4-2-1-3-12(13)17(21,22)23/h1-8,20H,(H2,21,22,23)(H,24,25,26)(H,27,28,29)
SMILES (canonical and isomeric)
C1=CC=C(C(=C1)N=NC2=C3C=CC(=CC3=CC(=C2O)S(=O)(=O)O)S(=O)(=O)O)[As](=O)(O)O

Synonyms

  • 2,7-Naphthalenedisulfonic acid, 4-[(2-arsonophenyl)azo]-3-hydroxy-
  • 2,7-Naphthalenedisulfonic acid, 4-((2-arsonophenyl)azo)-3-hydroxy-
  • 4-((2-Arsonophenyl)azo)-3-hydroxy-2,7-naphthalenedisulfonic acid
  • thoron
  • 4-[(2-arsonophenyl)diazenyl]-3-hydroxynaphthalene-2,7-disulfonic acid
  • Naphtharson
  • 2,7-Naphthalenedisulfonic acid, 4-[2-(2-arsonophenyl)diazenyl]-3-hydroxy-
  • ARANS
  • 2,7-Naphthalenedisulfonic acid, 4-(2-(2-arsonophenyl)diazenyl)-3-hydroxy-
  • Thorin free acid
  • Benzenearsonic acid, o-(2-hydroxy-3,6-disulfo-1-naphthylazo)-
  • 1-[(2-Arsonophenyl)azo]-2-hydroxy-3,6-naphthalenedisulfonic acid
  • 2,7-Naphthalenedisulfonic acid, 4-(2-arsonophenylazo)-3-hydroxy-
  • 4-((2-Arsonophenyl)azo)-3-hydroxynaphthalene-2,7-disulphonic acid
  • 4-[2-(2-Arsonophenyl)diazenyl]-3-hydroxy-2,7-naphthalenedisulfonic 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
532.34 g/molcalc.
Exact mass
531.9228 Dacalc.
LogP (octanol/water)
1.02calc.
Topological polar surface area
211.2 Ųcalc.
Hydrogen bond donors
5calc.
Hydrogen bond acceptors
8calc.
Rotatable bonds
5calc.
Heavy atoms
31calc.
Rings
3calc.
Aromatic rings
3calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (1 violation)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=Nc2cccc3ccccc23)cc1

c1ccc(N=Nc2cccc3ccccc23)cc1

3 rings, 18 atoms, the Diazene, naphthalenylphenyl- ring system.

1,098 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS06: Acute toxicity (severe)
Acute toxicity (severe)
GHS09: Hazardous to the environment
Hazardous to the environment

Hazard statements

  • H301Toxic if swallowed.
  • H331Toxic if inhaled.
  • H400Very toxic to aquatic life.
  • H410Very toxic to aquatic life with long lasting effects.
Precautionary statements (14)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P273Avoid release to the environment.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P316Get emergency medical help immediately.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P391Collect spillage.
  • 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

Thoron (reagent) suppliers

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Thoron (reagent) price

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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 Thoron (reagent) is traded under.

HS 2931.90Indicative HS code

Organo-inorganic compounds, other than tetramethyl lead, tetraethyl lead, tributyltin compounds…

World exports in 2024
$3.97B
+5.3% vs 2023, imports $3.93B
2019 to 2024
Top exporters
  1. China28.3%
  2. United States15.6%
  3. Germany15.1%
Top importers
  1. United States14.6%
  2. China13.0%
  3. South Korea8.5%
Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

Quick answers about Thoron (reagent), based on the data on this page

What is Thoron (reagent)?

Thoron (reagent) is a chemical substance with the molecular formula C16H13AsN2O10S2 and a molar mass of 532.34 g/mol. Its CAS registry number is 132-33-2. The IUPAC name is 4-[(2-arsonophenyl)diazenyl]-3-hydroxynaphthalene-2,7-disulfonic acid.

What is the CAS number of Thoron (reagent)?

The CAS registry number of Thoron (reagent) is 132-33-2.

What is the molecular formula and weight of Thoron (reagent)?

The molecular formula of Thoron (reagent) is C16H13AsN2O10S2 and its molar mass is 532.34 g/mol.

What is Thoron (reagent) used for?

Known uses and roles of Thoron (reagent) include building blocks in research and laboratory and screening compounds in research and laboratory.

Is Thoron (reagent) hazardous?

Thoron (reagent) carries the GHS signal word "Danger". Main hazards: toxic if swallowed, toxic if inhaled, very toxic to aquatic life. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Thoron (reagent)?

Thoron (reagent) is usually classified under HS code 293190 (X. ORGANO-INORGANIC COMPOUNDS, HETEROCYCLIC COMPOUNDS, NUCLEIC ACIDS AND THEIR SALTS…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Thoron (reagent)?

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What is the price of Thoron (reagent)?

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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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