Sulfamethoxazole EP Impurity B

Name: Sulfamethoxazole EP Impurity B
Brand: Vaqora Chemicals
SKU: VQ-028141

About Sulfamethoxazole EP Impurity B

Sulfamethoxazole EP Impurity B (CAS 135529-16-7) is a pharmacopeial impurity of Sulfamethoxazole offered by Vaqora Chemicals. The compound has the formula C16H16N4O5S2, corresponding to a molecular weight of 408.5 g/mol. Its systematic (IUPAC) name is 4-amino-N-[4-[(5-methyl-1,2-oxazol-3-yl)sulfamoyl]phenyl]benzenesulfonamide. Common synonyms include Sulfamethoxazole - Impurity B and Sulfamethoxazole impurity B.

It is supplied as a solid. Reference materials should be stored sealed and away from light and moisture, as specified on the accompanying COA. The GHS classification uses the signal word “Warning”, so appropriate gloves, eye protection and ventilation are recommended.

As a characterised impurity of Sulfamethoxazole, 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.

Vaqora Chemicals supplies Sulfamethoxazole EP Impurity B in 10 mg, 25 mg, 50 mg and 100 mg packs, each shipped with a Certificate of Analysis (COA), and exports worldwide.

Typical applications

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

Industries

Related to Sulfamethoxazole

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

Sulfamethoxazole impurities

Grade guides

Specifications & identifiers

Chemical identifiers
Product name	Sulfamethoxazole EP Impurity B
Catalogue No.	VQ-028141
CAS Number	135529-16-7
IUPAC name	4-amino-N-[4-[(5-methyl-1,2-oxazol-3-yl)sulfamoyl]phenyl]benzenesulfonamide
Molecular formula	C₁₆H₁₆N₄O₅S₂
Molecular weight	408.5 g/mol
Exact mass	408.0562
Grade	Reference Standard
HSN code	38229090
InChIKey	ULRBBWWPWOJYFE-UHFFFAOYSA-N
SMILES	CC1=CC(=NO1)NS(=O)(=O)C2=CC=C(C=C2)NS(=O)(=O)C3=CC=C(C=C3)N
PubChem CID	71313144

Physical properties
Physical form	Solid
LogP (XLogP3)	1.4
H-bond donors / acceptors	3 / 9
TPSA	161 Å²
Synonyms	Sulfamethoxazole - Impurity B, 4-Amino-N-(4-(N-(5-methylisoxazol-3-yl)sulfamoyl)phenyl)benzenesulfonamide, 4-(((4-Aminophenyl)sulfonyl)amino)-N-(5-methylisoxazol-3-yl)benzenesulfonamide, Benzenesulfonamide, 4-amino-N-(4-(((5-methyl-3-isoxazolyl)amino)sulfonyl)phenyl)-, Sulfamethoxazole impurity B, N-(4-Aminobenzenesulfonyl) Sulfamethoxazole, 4-[[(4-Aminophenyl)sulphonyl]amino]-N-(5-methylisoxazol-3-yl)benzenesulphonamide, 4-amino-N-[4-[(5-methyl-1,2-oxazol-3-yl)sulamoyl]phenyl]benzenesulonamide, 4-Amino-N-{4-[(5-methyl-1,2-oxazol-3-yl)sulfamoyl]phenyl}benzene-1-sulfonamide

Safety & hazard information (GHS)

Harmful / irritant

Signal word: Warning

Hazard statements

H302Harmful if swallowed

Precautionary statements: P264, P270, P301 + P317, P330, 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 Sulfamethoxazole EP Impurity B?

The CAS Registry Number of Sulfamethoxazole EP Impurity B is 135529-16-7. It is also known as Sulfamethoxazole - Impurity B, 4-Amino-N-(4-(N-(5-methylisoxazol-3-yl)sulfamoyl)phenyl)benzenesulfonamide, 4-(((4-Aminophenyl)sulfonyl)amino)-N-(5-methylisoxazol-3-yl)benzenesulfonamide.

What is the molecular formula and molecular weight of Sulfamethoxazole EP Impurity B?

Sulfamethoxazole EP Impurity B has the molecular formula C16H16N4O5S2 and a molecular weight of 408.5 g/mol. Its IUPAC name is 4-amino-N-[4-[(5-methyl-1,2-oxazol-3-yl)sulfamoyl]phenyl]benzenesulfonamide.

What is Sulfamethoxazole EP Impurity B used for?

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

We supply Sulfamethoxazole EP Impurity B 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 Sulfamethoxazole EP Impurity B?

Yes. Every lot of Sulfamethoxazole EP Impurity B 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 Sulfamethoxazole EP Impurity B be shipped internationally?

Yes. Sulfamethoxazole EP Impurity B 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.