Ethyl 5-methylisoxazole-4-carboxylate

Name: Ethyl 5-methylisoxazole-4-carboxylate
Brand: Vaqora Chemicals
SKU: VQ-026385

About Ethyl 5-methylisoxazole-4-carboxylate

Ethyl 5-methylisoxazole-4-carboxylate (CAS 51135-73-0) is an impurity of Leflunomide offered by Vaqora Chemicals. The compound has the formula C7H9NO3, corresponding to a molecular weight of 155.15 g/mol. Its systematic (IUPAC) name is ethyl 5-methyl-1,2-oxazole-4-carboxylate. It is also known as Ethyl-5-methyl isoxazole carboxylic acid or Ethyl 5-methyl-4-isoxazolecarboxylate.

It is supplied 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.

As a characterised impurity of Leflunomide, it is used for analytical method development, method validation (AMV) and routine quality-control testing, and it supports ANDA and DMF regulatory filings. Our customers for this product work in pharmaceutical manufacturing and academic and industrial research.

Available in 10 mg, 25 mg, 50 mg and 100 mg packs, Ethyl 5-methylisoxazole-4-carboxylate is dispatched with a Certificate of Analysis (COA) to destinations 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	Ethyl 5-methylisoxazole-4-carboxylate
Catalogue No.	VQ-026385
CAS Number	51135-73-0
IUPAC name	ethyl 5-methyl-1,2-oxazole-4-carboxylate
Molecular formula	C₇H₉NO₃
Molecular weight	155.15 g/mol
Exact mass	155.0582
Grade	Reference Standard
HSN code	38229090
InChIKey	KOMSQTMQKWSQDW-UHFFFAOYSA-N
SMILES	CCOC(=O)C1=C(ON=C1)C
PubChem CID	7009317

Physical properties
Physical form	Solid
LogP (XLogP3)	1
H-bond donors / acceptors	0 / 4
TPSA	52.3 Å²
Synonyms	Ethyl-5-methyl isoxazole carboxylic acid, Ethyl 5-methyl-4-isoxazolecarboxylate, Ethyl 5-m+C3117ethyl-4-isoxazolecarboxylate, Ethyl 5-methylisoxazol-4-yl carboxylate, 4-Isoxazolecarboxylic acid, 5-methyl-, ethyl ester

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 Ethyl 5-methylisoxazole-4-carboxylate?

The CAS Registry Number of Ethyl 5-methylisoxazole-4-carboxylate is 51135-73-0. It is also known as Ethyl-5-methyl isoxazole carboxylic acid, Ethyl 5-methyl-4-isoxazolecarboxylate, Ethyl 5-m+C3117ethyl-4-isoxazolecarboxylate.

What is the molecular formula and molecular weight of Ethyl 5-methylisoxazole-4-carboxylate?

Ethyl 5-methylisoxazole-4-carboxylate has the molecular formula C7H9NO3 and a molecular weight of 155.15 g/mol. Its IUPAC name is ethyl 5-methyl-1,2-oxazole-4-carboxylate.

What is Ethyl 5-methylisoxazole-4-carboxylate used for?

Ethyl 5-methylisoxazole-4-carboxylate 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 Ethyl 5-methylisoxazole-4-carboxylate can I order?

We supply Ethyl 5-methylisoxazole-4-carboxylate 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 Ethyl 5-methylisoxazole-4-carboxylate?

Yes. Every lot of Ethyl 5-methylisoxazole-4-carboxylate 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 Ethyl 5-methylisoxazole-4-carboxylate be shipped internationally?

Yes. Ethyl 5-methylisoxazole-4-carboxylate 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.