Metamizole EP Impurity A

Name: Metamizole EP Impurity A
Brand: Vaqora Chemicals
SKU: VQ-023082

About Metamizole EP Impurity A

Metamizole EP Impurity A (CAS 1672-58-8) is a pharmacopeial impurity of Metamizole offered by Vaqora Chemicals. Its molecular formula is C12H13N3O2 and its molecular weight is 231.25 g/mol. The IUPAC name is N-(1,5-dimethyl-3-oxo-2-phenylpyrazol-4-yl)formamide. Common synonyms include Metamizole Impurity A and Metamizole Sodium - Impurity A.

The product is provided as a solid. Keep the vial tightly closed, protected from light and humidity, at the temperature stated on the Certificate of Analysis. Under GHS it is labelled “Danger”, so handle it with suitable PPE and consult the SDS.

This Metamizole impurity supports analytical method development and validation (AMV), batch release testing and the impurity sections of ANDA and DMF filings. Typical end-use sectors are pharmaceutical manufacturing and academic and industrial research.

We offer Metamizole EP Impurity A in 10 mg, 25 mg, 50 mg and 100 mg packs with a batch-specific COA, and ship to customers worldwide.

Typical applications

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

Industries

Related to Metamizole

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

Metamizole impurities

Grade guides

Specifications & identifiers

Chemical identifiers
Product name	Metamizole EP Impurity A
Catalogue No.	VQ-023082
CAS Number	1672-58-8
IUPAC name	N-(1,5-dimethyl-3-oxo-2-phenylpyrazol-4-yl)formamide
Molecular formula	C₁₂H₁₃N₃O₂
Molecular weight	231.25 g/mol
Exact mass	231.1008
Grade	Reference Standard
HSN code	38229090
InChIKey	WSJBSKRPKADYRQ-UHFFFAOYSA-N
SMILES	CC1=C(C(=O)N(N1C)C2=CC=CC=C2)NC=O
PubChem CID	72666

Physical properties
Physical form	Solid
H-bond donors / acceptors	1 / 3
TPSA	52.7 Å²
Synonyms	Metamizole Impurity A, Metamizole Sodium - Impurity A, 4-Formylaminoantipyrine, 4-(Formylamino)antipyrine, N-(1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)formamide, 4-Formylamino Antipyrine, 4-Formamidoantipyrine, Formamide, N-antipyrinyl-, (1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)formamide, N-(2,3-Dihydro-1,5-dimethyl-3-oxo-2-phenyl-1H-pyrazol-4-yl)formamide, Formamide, N-(2,3-dihydro-1,5-dimethyl-3-oxo-2-phenyl-1H-pyrazol-4-yl)-, formamide, (2,3-dihydro-1,5-dimethyl-3-oxo-2-phenyl-1H-pyrazol-4-yl)-

Safety & hazard information (GHS)

Toxic

Harmful / irritant

Signal word: Danger

Hazard statements

H302Harmful if swallowed
H330Fatal if inhaled

Precautionary statements: P260, P264, P270, P271, P284, P301 + P317, P304 + P340, P316, P320, P330, 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 Metamizole EP Impurity A?

The CAS Registry Number of Metamizole EP Impurity A is 1672-58-8. It is also known as Metamizole Impurity A, Metamizole Sodium - Impurity A, 4-Formylaminoantipyrine.

What is the molecular formula and molecular weight of Metamizole EP Impurity A?

Metamizole EP Impurity A has the molecular formula C12H13N3O2 and a molecular weight of 231.25 g/mol. Its IUPAC name is N-(1,5-dimethyl-3-oxo-2-phenylpyrazol-4-yl)formamide.

What is Metamizole EP Impurity A used for?

Metamizole EP Impurity A is supplied as a characterised reference material related to Metamizole. 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 Metamizole EP Impurity A can I order?

We supply Metamizole EP Impurity A 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 Metamizole EP Impurity A?

Yes. Every lot of Metamizole EP Impurity A 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 Metamizole EP Impurity A be shipped internationally?

Yes. Metamizole EP Impurity A 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.