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Metabolites & Degradation Products

4-Hydroxy Antipyrine

Reference StandardAvailable on request

Order 4-Hydroxy Antipyrine (CAS 1672-63-5) online at Zemixal: C11H12N2O2, COA and SDS with every lot, worldwide shipping.

Pack sizes
4-Hydroxy Antipyrine chemical structure
CAS number1672-63-5
FormulaC11H12N2O2
Molar mass204.22 g/mol
Physical formSolid
HS code38229090
InChIKeySKVPTPMWXJSBTF-UHFFFAOYSA-N
IUPAC name4-hydroxy-1,5-dimethyl-2-phenylpyrazol-3-one

About 4-Hydroxy Antipyrine

4-Hydroxy Antipyrine is supplied by Zemixal as a characterised reference material for Metamizole analysis. Identity at a glance (Reference Standard): CAS 1672-63-5, formula C11H12N2O2 and molar mass 204.22 g/mol. It is handled as a solid.

Common uses in the lab and plant

  • Metabolite identification
  • Stability-indicating methods
  • Impurity profiling

Storage and safety notes

Hazard communication follows GHS (Warning: H315, H319 and H335). Our SDS lists exposure controls and first-aid measures.

Available as 10 mg, 25 mg, 50 mg and 100 mg. Larger or split packs can be arranged. You receive a certificate of analysis with characterisation data with each order. Add it to your quote list and our team replies with price, lead time and shipping options within one business day.

Reference standards for Metamizole

See every impurity, metabolite and related compound we list for this API.

Metamizole standards

Typical uses

  • Metabolite identification
  • Stability-indicating methods
  • Impurity profiling

Applications

Pharmaceutical Manufacturing and QCResearch Labs and Universities

Specifications and identifiers

Specifications of 4-Hydroxy Antipyrine
Product name4-Hydroxy Antipyrine
Catalogue numberZX-026036
CAS number1672-63-5
IUPAC name4-hydroxy-1,5-dimethyl-2-phenylpyrazol-3-one
Molecular formulaC11H12N2O2
Molar mass204.22 g/mol
Exact mass204.0899
GradeReference Standard
Physical formSolid
XLogP30.5
H-bond donors / acceptors1 / 3
Topological polar surface area43.8 Ų
HS code38229090
InChIKeySKVPTPMWXJSBTF-UHFFFAOYSA-N
SMILESCC1=C(C(=O)N(N1C)C2=CC=CC=C2)O
PubChem CID98889
Synonyms3H-Pyrazol-3-one, 1,2-dihydro-4-hydroxy-1,5-dimethyl-2-phenyl-, 4-Hydroxy-1,5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one, Antipyrine, 4-hydroxy, 4-hydroxy-1,5-dimethyl-2-phenyl-1,2-dihydro-3h-pyrazol-3-one, 4-hydroxyphenazone, 4-Hydroxyantipyrene, 1,2-Dihydro-4-hydroxy-1,5-dimethyl-2-phenyl-3H-pyrazol-3-one, 4-hydroxy-1,5-dimethyl-2-phenyl-2,3-dihydro-1H-pyrazol-3-one, 4-hydroxy-1,5-dimethyl-2-phenyl-3-pyrazolone, 4-hydroxy-1,5-dimethyl-2-phenyl-pyrazol-3-one, 3H-Pyrazol-3-one,2-dihydro-4-hydroxy-1,5-dimethyl-2-phenyl-

Lot values are stated on the batch certificate of analysis. Ask for a typical COA with your quotation.

Safety and GHS hazards

GHS07 Irritant or harmful
Irritant or harmful

Signal word Warning

  • H315Causes skin irritation
  • H319Causes serious eye irritation
  • H335May cause respiratory irritation

Precautionary statements P261, P264, P264 + P265, P271, P280, P302 + P352, P304 + P340, P305 + P351 + P338, P319, P321, P332 + P317, P337 + P317, P362 + P364, P403 + P233, P405, P501

Classification summarised from public GHS notifications. It can vary with grade and concentration, so always follow the SDS supplied with your lot.

Pack sizes

Pack sizes of 4-Hydroxy Antipyrine
10 mgQuoted on request
25 mgQuoted on request
50 mgQuoted on request
100 mgQuoted on request

Need a different size? Bulk drums and custom packing are quoted on request through the quote form on this page.

Questions about 4-Hydroxy Antipyrine

Which CAS number identifies 4-Hydroxy Antipyrine?
4-Hydroxy Antipyrine is registered under CAS 1672-63-5. You may also see it listed as 3H-Pyrazol-3-one, 1,2-dihydro-4-hydroxy-1,5-dimethyl-2-phenyl-, 4-Hydroxy-1,5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one, Antipyrine, 4-hydroxy. Our catalogue number for this item is ZX-026036.
What are the formula and molar mass of 4-Hydroxy Antipyrine?
For 4-Hydroxy Antipyrine, its formula is C11H12N2O2 and its molar mass is 204.22 g/mol. The systematic (IUPAC) name is 4-hydroxy-1,5-dimethyl-2-phenylpyrazol-3-one. InChIKey SKVPTPMWXJSBTF-UHFFFAOYSA-N lets you match it in any structure database.
How is 4-Hydroxy Antipyrine used in pharmaceutical QC?
4-Hydroxy Antipyrine is a characterised reference material linked to Metamizole. Laboratories use it to identify and quantify this impurity during method development and validation, stability work, batch release testing and regulatory submissions.
What grade and pack sizes are available for 4-Hydroxy Antipyrine?
This listing is Reference Standard grade. Standard packs are 10 mg, 25 mg, 50 mg, 100 mg. Larger quantities and custom packing can be quoted on request.
Which documents come with 4-Hydroxy Antipyrine?
Each lot ships with a batch certificate of analysis and a 16-section GHS safety data sheet. A typical COA or specification sheet can be shared with the quotation before you order.
Can Zemixal ship 4-Hydroxy Antipyrine to my country?
Yes. Because 4-Hydroxy Antipyrine is classed as hazardous, it travels in UN-approved packaging as dangerous goods under IATA or IMDG rules, with the export paperwork your broker needs.

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