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Heterocyclic building blocks

Pyrazolone T

Also known as 1-(4'-Sulfophenyl)-3-carboxy-5-pyrazolone, 5-oxo-1-(4-sulfophenyl)-4H-pyrazole-3-carboxylic acid, 1H-Pyrazole-3-carboxylic acid, 4,5-dihydro-5-oxo-1-(4-sulfophenyl)-

CAS 118-47-8Formula C10H8N2O6SMolar mass 284.25 g/molEC 204-254-5
GHS signal word: Warning. Pictograms: Harmful or irritant 9 suppliers listed
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Pyrazolone T chemical structure, C10H8N2O6S, CAS 118-47-8
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
118-47-8
Formula
C10H8N2O6S
Molar mass
284.25 g/mol
EC number
204-254-5
HS code
293319
Category
Heterocyclic building blocks

What is Pyrazolone T?

Plain description, key identifiers and synonyms

Pyrazolone T is a chemical substance with the molecular formula C10H8N2O6S and a molar mass of 284.25 g/mol. Its CAS registry number is 118-47-8. The IUPAC name is 5-oxo-1-(4-sulfophenyl)-4H-pyrazole-3-carboxylic acid.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
5-oxo-1-(4-sulfophenyl)-4H-pyrazole-3-carboxylic acid
CAS number
118-47-8 CAS number cross-checkedOther or deprecated CAS: 21951-33-7
EC numbers
204-254-5, 244-677-2
Molecular formula
C10H8N2O6S
UNII
2A9HS5E9L7
MDL number
MFCD00020755
InChIKey
TYCNXOAPQGVAQU-UHFFFAOYSA-N
InChI
InChI=1S/C10H8N2O6S/c13-9-5-8(10(14)15)11-12(9)6-1-3-7(4-2-6)19(16,17)18/h1-4H,5H2,(H,14,15)(H,16,17,18)
SMILES (canonical and isomeric)
C1C(=NN(C1=O)C2=CC=C(C=C2)S(=O)(=O)O)C(=O)O

Synonyms

  • 1-(4'-Sulfophenyl)-3-carboxy-5-pyrazolone
  • 5-oxo-1-(4-sulfophenyl)-4H-pyrazole-3-carboxylic acid
  • 1H-Pyrazole-3-carboxylic acid, 4,5-dihydro-5-oxo-1-(4-sulfophenyl)-
  • 5-Oxo-1-(4-sulphophenyl)-2-pyrazoline-3-carboxylic acid
  • 2-Pyrazoline-3-carboxylic acid, 5-oxo-1-(p-sulfophenyl)-(6CI,7CI,8CI)
  • 1H-Pyrazole-3-carboxylic acid, 5-hydroxy-1-(4-sulfophenyl)-
  • 4,5-Dihydro-5-oxo-1-(4-sulfophenyl)-1H-pyrazole-3-carboxylic acid
  • 5-Oxo-1-(P-sulfophenyl)-2-pyrazoline-3-carboxylic acid
  • 5-oxo-1-(4-sulfophenyl)-4,5-dihydro-1H-pyrazole-3-carboxylic acid
  • 5-oxo-1-(4-sulfophenyl)-2-pyrazoline-3-carboxylic acid
  • 2-Pyrazoline-3-carboxylic acid, 5-oxo-1-(p-sulfophenyl)-
  • 1H-Pyrazole-3-carboxylic acid,5-dihydro-5-oxo-1-(4-sulfophenyl)-
  • PYT
  • 1-(4`-Sulfophenyl)-3-carboxy-5-pyrazolone
  • 1-(4/'-Sulfophenyl)-3-carboxy-5-pyrazolone
  • 1-(4\'-Sulfophenyl)-3-carboxy-5-pyrazolone
  • 5-oxo-1-(4-sulfophenyl)-4,5-dihydro-1H-pyrazole-3-carboxylicacid
  • 4,5-dihydro-5-oxo-1-(4'-sulphophenyl)-1h-pyrazole-3-carboxylic acid
  • 5-Oxo-1-(4-Sulfophenyl)-4,5-Dihydro-1H-Pyrazole-3-Carboxylic Acid(Discontinued,See C4X-25621)

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
284.25 g/molcalc.
Exact mass
284.0103 Dacalc.
LogP (octanol/water)
0.11calc.
Topological polar surface area
124.3 Ųcalc.
Hydrogen bond donors
2calc.
Hydrogen bond acceptors
5calc.
Rotatable bonds
3calc.
Heavy atoms
19calc.
Rings
2calc.
Aromatic rings
1calc.
Fraction sp3 carbons
0.1calc.
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, O=C1CC=NN1c1ccccc1

O=C1CC=NN1c1ccccc1

2 rings, 12 atoms, the 1-Phenyl-1H-pyrazol-5(4H)-one ring system.

416 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

  • H319Causes serious eye irritation.
  • H412Harmful to aquatic life with long lasting effects.
Precautionary statements (6)
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P337 + P317If eye irritation persists: Get medical help.
  • 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

Pyrazolone T suppliers

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

All 9 suppliers
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Where suppliers are based

9 suppliers in 2 countries

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Pyrazolone T 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 Pyrazolone T 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 Pyrazolone T is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Pyrazolone T, based on the data on this page

What is Pyrazolone T?

Pyrazolone T is a chemical substance with the molecular formula C10H8N2O6S and a molar mass of 284.25 g/mol. Its CAS registry number is 118-47-8. The IUPAC name is 5-oxo-1-(4-sulfophenyl)-4H-pyrazole-3-carboxylic acid.

What is the CAS number of Pyrazolone T?

The CAS registry number of Pyrazolone T is 118-47-8. Other or deprecated CAS numbers: 21951-33-7.

What is the molecular formula and weight of Pyrazolone T?

The molecular formula of Pyrazolone T is C10H8N2O6S and its molar mass is 284.25 g/mol.

What is Pyrazolone T used for?

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

Is Pyrazolone T hazardous?

Pyrazolone T carries the GHS signal word "Warning". Main hazards: causes serious eye irritation, harmful to aquatic life with long lasting effects. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Pyrazolone T?

Pyrazolone T 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 Pyrazolone T?

CompoundList lists 9 suppliers of Pyrazolone T in India and China. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Pyrazolone T in India?

8 suppliers in India list Pyrazolone T on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Pyrazolone T?

Suppliers quote Pyrazolone T on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

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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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