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Pharmacopeial Impurities (EP / USP / BP)

Sulfamethoxazole EP Impurity B

Reference StandardAvailable on request

Sulfamethoxazole EP Impurity B (CAS 135529-16-7) supplier Zemixal. Lab and bulk packs, batch COA, fast global delivery. Packs from 10 mg.

Pack sizes
Sulfamethoxazole EP Impurity B chemical structure
CAS number135529-16-7
FormulaC16H16N4O5S2
Molar mass408.5 g/mol
Physical formSolid
HS code38229090
InChIKeyULRBBWWPWOJYFE-UHFFFAOYSA-N
IUPAC name4-amino-N-[4-[(5-methyl-1,2-oxazol-3-yl)sulfamoyl]phenyl]benzenesulfonamide

About Sulfamethoxazole EP Impurity B

Sulfamethoxazole EP Impurity B belongs to the Sulfamethoxazole reference-standard family in the Zemixal catalogue. For your records (Reference Standard), the material is defined by CAS 135529-16-7, formula C16H16N4O5S2 and molar mass 408.5 g/mol. It is handled as a solid.

Typical applications

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

Safe handling

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

Standard pack sizes are 10 mg, 25 mg, 50 mg and 100 mg, and custom quantities are quoted on request. 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 Sulfamethoxazole

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

Sulfamethoxazole 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 Sulfamethoxazole EP Impurity B
Product nameSulfamethoxazole EP Impurity B
Catalogue numberZX-027041
CAS number135529-16-7
IUPAC name4-amino-N-[4-[(5-methyl-1,2-oxazol-3-yl)sulfamoyl]phenyl]benzenesulfonamide
Molecular formulaC16H16N4O5S2
Molar mass408.5 g/mol
Exact mass408.0562
GradeReference Standard
Physical formSolid
XLogP31.4
H-bond donors / acceptors3 / 9
Topological polar surface area161 Ų
HS code38229090
InChIKeyULRBBWWPWOJYFE-UHFFFAOYSA-N
SMILESCC1=CC(=NO1)NS(=O)(=O)C2=CC=C(C=C2)NS(=O)(=O)C3=CC=C(C=C3)N
PubChem CID71313144
SynonymsSulfamethoxazole - 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

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 Sulfamethoxazole EP Impurity B
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 Sulfamethoxazole EP Impurity B

Which CAS number identifies Sulfamethoxazole EP Impurity B?
Sulfamethoxazole EP Impurity B is registered under CAS 135529-16-7. You may also see it listed 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. Our catalogue number for this item is ZX-027041.
What are the formula and molar mass of Sulfamethoxazole EP Impurity B?
For Sulfamethoxazole EP Impurity B, its formula is C16H16N4O5S2 and its molar mass is 408.5 g/mol. The systematic (IUPAC) name is 4-amino-N-[4-[(5-methyl-1,2-oxazol-3-yl)sulfamoyl]phenyl]benzenesulfonamide. InChIKey ULRBBWWPWOJYFE-UHFFFAOYSA-N lets you match it in any structure database.
How is Sulfamethoxazole EP Impurity B used in pharmaceutical QC?
Sulfamethoxazole EP Impurity B is a characterised reference material linked to Sulfamethoxazole. 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 Sulfamethoxazole EP Impurity B?
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 Sulfamethoxazole EP Impurity B?
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 Sulfamethoxazole EP Impurity B to my country?
Yes. Because Sulfamethoxazole EP Impurity B 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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