5-Methylisoxazole-3-carboxylic Acid

Name: 5-Methylisoxazole-3-carboxylic Acid
Brand: Vaqora Chemicals
SKU: VQ-051208

About 5-Methylisoxazole-3-carboxylic Acid

5-Methylisoxazole-3-carboxylic Acid (CAS 3405-77-4) is an impurity of Leflunomide offered by Vaqora Chemicals. With the molecular formula C5H5NO3, it has a molar mass of 127.1 g/mol. Systematically, it is named 5-methyl-1,2-oxazole-3-carboxylic acid. It is also known as 3-Methyl-5-isoxazolecarboxylic acid or 5-carboxy-3-methylisoxazole.

The product is provided as a solid. Reference materials should be stored sealed and away from light and moisture, as specified on the accompanying COA. It carries the GHS signal word “Warning” with 3 hazard statements. Review the Safety Data Sheet before use.

This Leflunomide impurity supports analytical method development and validation (AMV), batch release testing and the impurity sections of ANDA and DMF filings. Our customers for this product work in pharmaceutical manufacturing and academic and industrial research.

We offer 5-Methylisoxazole-3-carboxylic Acid in 10 mg, 25 mg, 50 mg and 100 mg packs with a batch-specific COA, and ship to customers worldwide.

Typical applications

Analytical method development
Method validation (AMV)
QC release testing
ANDA / DMF filings

Industries

Related to Leflunomide

View every impurity, metabolite and intermediate we list for Leflunomide.

Leflunomide impurities

Specifications & identifiers

Chemical identifiers
Product name	5-Methylisoxazole-3-carboxylic Acid
Catalogue No.	VQ-051208
CAS Number	3405-77-4
IUPAC name	5-methyl-1,2-oxazole-3-carboxylic acid
Molecular formula	C₅H₅NO₃
Molecular weight	127.1 g/mol
Exact mass	127.0269
Grade	Reference Standard
HSN code	38229090
InChIKey	BNMPIJWVMVNSRD-UHFFFAOYSA-N
SMILES	CC1=CC(=NO1)C(=O)O
PubChem CID	76947

Physical properties
Physical form	Solid
LogP (XLogP3)	0.7
H-bond donors / acceptors	1 / 4
TPSA	63.3 Å²
Synonyms	3-Methyl-5-isoxazolecarboxylic acid, 5-carboxy-3-methylisoxazole, 5-methyl-3-isoxazolecarboxylic acid, 5-Methyl-3-isooxazolecarboxylic acid, 5-methylisoxazol-3-carbonsaure, 5-methyl-isoxazole-carboxylic acid, 5-methyl-3-isoxazolecarboxlic acid

Safety & hazard information (GHS)

Harmful / irritant

Signal word: Warning

Hazard statements

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 is indicative (aggregated GHS notifications) and may vary by grade and concentration. Always refer to the SDS supplied with your lot.

Documents

Safety Data Sheet (SDS)16-section GHS · on request Certificate of AnalysisTypical / batch COA · on request Specification sheetTDS / MOA · on request

Frequently asked questions

What is the CAS number of 5-Methylisoxazole-3-carboxylic Acid?

The CAS Registry Number of 5-Methylisoxazole-3-carboxylic Acid is 3405-77-4. It is also known as 3-Methyl-5-isoxazolecarboxylic acid, 5-carboxy-3-methylisoxazole, 5-methyl-3-isoxazolecarboxylic acid.

What is the molecular formula and molecular weight of 5-Methylisoxazole-3-carboxylic Acid?

5-Methylisoxazole-3-carboxylic Acid has the molecular formula C5H5NO3 and a molecular weight of 127.1 g/mol. Its IUPAC name is 5-methyl-1,2-oxazole-3-carboxylic acid.

What is 5-Methylisoxazole-3-carboxylic Acid used for?

5-Methylisoxazole-3-carboxylic Acid is supplied as a characterised reference material related to Leflunomide. It is used for analytical method development and validation (AMV), impurity profiling, stability studies and quality control, and in ANDA/DMF regulatory filings.

Which grade and pack sizes of 5-Methylisoxazole-3-carboxylic Acid can I order?

We supply 5-Methylisoxazole-3-carboxylic Acid in Reference Standard grade, in 10 mg, 25 mg, 50 mg, 100 mg packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with 5-Methylisoxazole-3-carboxylic Acid?

Yes. Every lot of 5-Methylisoxazole-3-carboxylic Acid is shipped with a batch-specific Certificate of Analysis, and a 16-section GHS Safety Data Sheet is provided with the quotation and the shipment.

Can 5-Methylisoxazole-3-carboxylic Acid be shipped internationally?

Yes. 5-Methylisoxazole-3-carboxylic Acid is classified as hazardous, so it is packed in UN-approved packaging and shipped as dangerous goods under IATA/IMDG rules. We export worldwide on EXW, FOB, CIF and DAP terms.