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Heterocyclic building blocks

Pyrazoxone

Also known as Pyrazoxon, Pirazoxon, Geigy G-24483

CAS 108-34-9Formula C8H15N2O4PMolar mass 234.19 g/mol
GHS signal word: Danger. Pictograms: Acute toxicity (severe)
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Pyrazoxone chemical structure, C8H15N2O4P, CAS 108-34-9
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
108-34-9
Formula
C8H15N2O4P
Molar mass
234.19 g/mol
HS code
293319
Category
Heterocyclic building blocks

What is Pyrazoxone?

Plain description, key identifiers and synonyms

Pyrazoxone is a chemical substance with the molecular formula C8H15N2O4P and a molar mass of 234.19 g/mol. Its CAS registry number is 108-34-9. The IUPAC name is diethyl (5-methyl-1H-pyrazol-3-yl) phosphate.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
diethyl (5-methyl-1H-pyrazol-3-yl) phosphate
CAS number
108-34-9 CAS number cross-checked
Molecular formula
C8H15N2O4P
InChIKey
CDCTYRNLXFEDHC-UHFFFAOYSA-N
InChI
InChI=1S/C8H15N2O4P/c1-4-12-15(11,13-5-2)14-8-6-7(3)9-10-8/h6H,4-5H2,1-3H3,(H,9,10)
SMILES (canonical and isomeric)
CCOP(=O)(OCC)OC1=NNC(=C1)C

Synonyms

  • Pyrazoxon
  • Pirazoxon
  • Geigy G-24483
  • Methylpyrazolyl diethylphosphate
  • 3-Methylpyrazolyl-5-diethylphosphate
  • ENT 24,723
  • Diethyl 3-methyl-5-pyrazolyl phosphate
  • O,O-Diethyl O-(3-methyl-5-pyrazolyl) phosphate
  • Phosphoric acid, diethyl-(3-methyl-5-pyrazolyl) ester
  • Phosphoric acid, diethyl-, 3-methylpyrazole-5-yl ester
  • Pyrazol-3(or 5)-ol, 5(or 3)-methyl-, diethyl phosphate
  • O,O-Diethyl-O-(3-methyl-1H-pyrazol-5-yl)-fosfaat
  • O,O-Dietil-O-(3-metil-1H-pirazol-5-il)-fosfato
  • Phosphate de diethyle et de 3-methyl-5-pyrazolyle
  • O,O-Diaethyl-O-(3-methyl-1H-pyrazol-5-yl)-phosphat
  • Phosphoric acid, diethyl 5-methyl-1H-pyrazol-3-yl ester
  • Phosphoric acid, diethyl 5(or 3)-methylpyrazole-3(or 5)-yl ester
  • diethyl (5-methyl-1H-pyrazol-3-yl) phosphate
  • diethyl 5-methyl-1H-pyrazol-3-yl phosphate

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
234.19 g/molcalc.
Exact mass
234.0769 Dacalc.
LogP (octanol/water)
2.28calc.
Topological polar surface area
73.44 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
5calc.
Rotatable bonds
6calc.
Heavy atoms
15calc.
Rings
1calc.
Aromatic rings
1calc.
Fraction sp3 carbons
0.63calc.
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, c1cn[nH]c1

c1cn[nH]c1

1 ring, 5 atoms, the Pyrazole ring system.

40,521 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)

Hazard statements

  • H300Fatal if swallowed.
  • H310Fatal in contact with skin.
  • H330Fatal if inhaled.
Precautionary statements (18)
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P262Do not get in eyes, on skin, or on clothing.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P284In case of inadequate ventilation wear respiratory protection.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P316Get emergency medical help immediately.
  • P320Specific treatment is urgent (see supplemental first aid instructions on the label).
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P361 + P364Take off immediately all 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

Pyrazoxone suppliers

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Pyrazoxone 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

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 015-023-00-1

HS code and trade data

Customs classification and reported world trade statistics

Global trade

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

HS 2933.19Indicative HS code

Compounds containing an unfused pyrazole ring (whether or not hydrogenated) in the…

World exports in 2024
$3.44B
−22.6% vs 2023, imports $6.66B
2019 to 2024
Top exporters
  1. China21.6%
  2. Switzerland * partner reported20.5%
  3. Germany19.0%
Top importers
  1. Slovenia38.4%
  2. Portugal14.1%
  3. Brazil13.0%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

Quick answers about Pyrazoxone, based on the data on this page

What is Pyrazoxone?

Pyrazoxone is a chemical substance with the molecular formula C8H15N2O4P and a molar mass of 234.19 g/mol. Its CAS registry number is 108-34-9. The IUPAC name is diethyl (5-methyl-1H-pyrazol-3-yl) phosphate.

What is the CAS number of Pyrazoxone?

The CAS registry number of Pyrazoxone is 108-34-9.

What is the molecular formula and weight of Pyrazoxone?

The molecular formula of Pyrazoxone is C8H15N2O4P and its molar mass is 234.19 g/mol.

What is Pyrazoxone used for?

Known uses and roles of Pyrazoxone include building blocks in research and laboratory and screening compounds in research and laboratory.

Is Pyrazoxone hazardous?

Pyrazoxone carries the GHS signal word "Danger". Main hazards: fatal if swallowed, fatal in contact with skin, fatal if inhaled. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Pyrazoxone?

Pyrazoxone is usually classified under HS code 293319 (Compounds containing an unfused pyrazole ring (whether or not hydrogenated) in the…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Pyrazoxone?

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What is the price of Pyrazoxone?

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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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