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Pharmacopeial Impurities (EP / USP / BP)

Leflunomide EP Impurity C

Reference StandardAvailable on request

Order Leflunomide EP Impurity C (CAS 61643-23-0) online at Zemixal. Request a quote with price, lead time and documents.

Pack sizes
Leflunomide EP Impurity C chemical structure
CAS number61643-23-0
FormulaC12H9F3N2O2
Molar mass270.21 g/mol
Physical formSolid
HS code38229090
InChIKeyKBFQQKBZIFSAMY-UHFFFAOYSA-N
IUPAC name5-methyl-N-[3-(trifluoromethyl)phenyl]-1,2-oxazole-4-carboxamide

About Leflunomide EP Impurity C

Leflunomide EP Impurity C is supplied by Zemixal as a characterised reference material for Leflunomide analysis. Identity at a glance (Reference Standard): CAS 61643-23-0, formula C12H9F3N2O2 and molar mass 270.21 g/mol. It is handled as a solid.

Use cases we see most often

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

Handling and storage

Hazard communication follows GHS (Warning: H302). Our SDS lists exposure controls and first-aid measures.

Order it in 10 mg, 25 mg, 50 mg and 100 mg packs or ask for a bulk quotation. Each lot travels with 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 Leflunomide

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

Leflunomide 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 Leflunomide EP Impurity C
Product nameLeflunomide EP Impurity C
Catalogue numberZX-021964
CAS number61643-23-0
IUPAC name5-methyl-N-[3-(trifluoromethyl)phenyl]-1,2-oxazole-4-carboxamide
Molecular formulaC12H9F3N2O2
Molar mass270.21 g/mol
Exact mass270.0616
GradeReference Standard
Physical formSolid
XLogP32.5
H-bond donors / acceptors1 / 6
Topological polar surface area55.1 Ų
HS code38229090
InChIKeyKBFQQKBZIFSAMY-UHFFFAOYSA-N
SMILESCC1=C(C=NO1)C(=O)NC2=CC=CC(=C2)C(F)(F)F
PubChem CID7314718
SynonymsLeflunomide - Impurity C, 5-Methyl-N-(3-(trifluoromethyl)phenyl)isoxazole-4-carboxamide, 4-Isoxazolecarboxamide, 5-methyl-N-(3-(trifluoromethyl)phenyl)-, 5-Methyl-N-[3-(trifluoromethyl)phenyl]isoxazole-4-carboxamide, Leflunomide Impurity C, Leflunomide 3-Isomer, 5-methyl-N-[3-(trifluoromethyl)phenyl]-4-isoxazolecarboxamide

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

Precautionary statements P264, P270, P301 + P317, P330, 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 Leflunomide EP Impurity C
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 Leflunomide EP Impurity C

Which CAS number identifies Leflunomide EP Impurity C?
Leflunomide EP Impurity C is registered under CAS 61643-23-0. You may also see it listed as Leflunomide - Impurity C, 5-Methyl-N-(3-(trifluoromethyl)phenyl)isoxazole-4-carboxamide, 4-Isoxazolecarboxamide, 5-methyl-N-(3-(trifluoromethyl)phenyl)-. Our catalogue number for this item is ZX-021964.
What are the formula and molar mass of Leflunomide EP Impurity C?
For Leflunomide EP Impurity C, its formula is C12H9F3N2O2 and its molar mass is 270.21 g/mol. The systematic (IUPAC) name is 5-methyl-N-[3-(trifluoromethyl)phenyl]-1,2-oxazole-4-carboxamide. InChIKey KBFQQKBZIFSAMY-UHFFFAOYSA-N lets you match it in any structure database.
How is Leflunomide EP Impurity C used in pharmaceutical QC?
Leflunomide EP Impurity C is a characterised reference material linked to Leflunomide. 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 Leflunomide EP Impurity C?
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 Leflunomide EP Impurity C?
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 Leflunomide EP Impurity C to my country?
Yes. Because Leflunomide EP Impurity C 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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