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Pharmacopeial Impurities (EP / USP / BP)

Allopurinol EP Impurity A

Reference StandardAvailable on request

Order Allopurinol EP Impurity A (CAS 5334-31-6) online at Zemixal. Lab and bulk packs, batch COA, fast global delivery. Catalogue no. ZX-020544.

Pack sizes
Allopurinol EP Impurity A chemical structure
CAS number5334-31-6
FormulaC4H6N4O
Molar mass126.12 g/mol
Physical formSolid
HS code38229090
InChIKeyLEFSNWUSTYESGC-UHFFFAOYSA-N
IUPAC name5-amino-1H-pyrazole-4-carboxamide

About Allopurinol EP Impurity A

Allopurinol EP Impurity A belongs to the Allopurinol reference-standard family in the Zemixal catalogue. Identity at a glance (Reference Standard): CAS 5334-31-6, formula C4H6N4O and molar mass 126.12 g/mol. It is handled as a solid.

Common uses in the lab and plant

  • Pharmacopeial method verification
  • Impurity profiling
  • QC release testing
  • ANDA / DMF filings

Safe handling

It carries the GHS signal word Warning (H302, H312, H315 and H319), so wear gloves and eye protection and work with good ventilation.

Order it in 10 mg, 25 mg, 50 mg and 100 mg packs or ask for a bulk quotation. Every shipment includes a certificate of analysis with characterisation data. Send an enquiry through the quote panel and you get a formal offer with Incoterms and delivery time.

Reference standards for Allopurinol

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

Allopurinol standards

Typical uses

  • Pharmacopeial method verification
  • Impurity profiling
  • QC release testing
  • ANDA / DMF filings

Applications

Pharmaceutical Manufacturing and QCResearch Labs and Universities

Grade guides

Ph. Eur. Grade (European Pharmacopoeia)

Specifications and identifiers

Specifications of Allopurinol EP Impurity A
Product nameAllopurinol EP Impurity A
Catalogue numberZX-020544
CAS number5334-31-6
IUPAC name5-amino-1H-pyrazole-4-carboxamide
Molecular formulaC4H6N4O
Molar mass126.12 g/mol
Exact mass126.0542
GradeReference Standard
Physical formSolid
XLogP3-0.7
H-bond donors / acceptors3 / 3
Topological polar surface area97.8 Ų
HS code38229090
InChIKeyLEFSNWUSTYESGC-UHFFFAOYSA-N
SMILESC1=NNC(=C1C(=O)N)N
PubChem CID79254
SynonymsAllopurinol EP Impurity A (Free Base), allopurinol USP rc a, Allopurinol - Impurity A (Freebase), 3-Amino-1H-pyrazole-4-carboxamide, 1H-Pyrazole-4-carboxamide, 3-amino-, 3-Amino-4-carbamoylpyrazole, 3-Amino-pyrazole-4-carboxylic acid amide, 5-Amino-1H-pyrazole-4-carboxylic acid amide, 3-amino-2H-pyrazole-4-carboxamide, 5-aminopyrazole-4-carboxamide, [1,4']Bipiperidinyl-3-carboxylic acid ethyl esterdihydrochloride

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

  • H302Harmful if swallowed
  • H312Harmful in contact with skin
  • H315Causes skin irritation
  • H319Causes serious eye irritation
  • H332Harmful if inhaled
  • H335May cause respiratory irritation

Precautionary statements P261, P264, P264 + P265, P270, P271, P280, P301 + P317, P302 + P352, P304 + P340, P305 + P351 + P338, P317, P319, P321, P330, 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 Allopurinol EP Impurity A
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 Allopurinol EP Impurity A

Which CAS number identifies Allopurinol EP Impurity A?
Allopurinol EP Impurity A is registered under CAS 5334-31-6. You may also see it listed as Allopurinol EP Impurity A (Free Base), allopurinol USP rc a, Allopurinol - Impurity A (Freebase). Our catalogue number for this item is ZX-020544.
What are the formula and molar mass of Allopurinol EP Impurity A?
For Allopurinol EP Impurity A, its formula is C4H6N4O and its molar mass is 126.12 g/mol. The systematic (IUPAC) name is 5-amino-1H-pyrazole-4-carboxamide. InChIKey LEFSNWUSTYESGC-UHFFFAOYSA-N lets you match it in any structure database.
How is Allopurinol EP Impurity A used in pharmaceutical QC?
Allopurinol EP Impurity A is a characterised reference material linked to Allopurinol. 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 Allopurinol EP Impurity A?
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 Allopurinol EP Impurity A?
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 Allopurinol EP Impurity A to my country?
Yes. Because Allopurinol EP Impurity A 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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