Molekula
Sulfamethoxazole
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Sulfamethoxazole is a synthetic sulfonamide antibiotic used to treat bacterial infections such as urinary tract infections, bronchitis, and certain types of pneumonia. It works by inhibiting bacterial folic acid synthesis. Available in powder form with a CAS number of 723-46-6, molecular formula C10H11N3O3S, and molecular weight 253.28 g/mol. Store at ambient temperatures. Signal word: Warning. Molekula supplies Sulfamethoxazole from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Often bought together
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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25 g — £29.50 per pack ex VAT · £35.40 inc. VAT
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100 g — £77.90 per pack ex VAT · £93.48 inc. VAT
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | White or almost white crystalline powder |
| Melting Point | 169.0-172.0 |
| Grade | Pharma. |
| Heavy metals | ≤20 ppm |
| Loss on Drying | ≤0.5% |
| Assay | 99.0-101.0% |
| Sulphated Ash | ≤0.1% |
| Acidity | ≤0.3 mL of 0.1 M NaOH |
| Related Substances | ≤0.1% impurity F |
| Total Impurities | ≤0.3% |
| Any other impurity | ≤0.10% |
| Identification (IR) | Conforms to Reference |
| Identification (RAMAN) | Conforms to Reference |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 9 |
| Packing Group | III |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | Yellow-white powder |
| Odour | Odorless |
| Melting Point | 167 °C |
| Water Solubility | 610 mg/L at 37 °C |
| pKa | pKa1 = 1.6 |
| log P (octanol/water) | 0.89 |
Source: PubChem CID 5329 (HSDB, DrugBank)
Identification
| Property | Value |
|---|---|
| SKU | 21865528 |
| CAS Number | 723-46-6 |
| IUPAC Name | 4-amino-N-(5-methyl-1,2-oxazol-3-yl)benzenesulfonamide |
| EC Number | 211-963-3 |
| Molecular Formula | C10H11N3O3S |
| Molecular Weight | 253.28 |
| Exact Mass | 253.0521 |
| SMILES | CC1=CC(=NO1)NS(=O)(=O)C2=CC=C(C=C2)N |
| InChIKey | JLKIGFTWXXRPMT-UHFFFAOYSA-N |
| InChI | InChI=1S/C10H11N3O3S/c1-7-6-10(12-16-7)13-17(14,15)9-4-2-8(11)3-5-9/h2-6H,11H2,1H3,(H,12,13) |
| PubChem CID | 5329 |
| UN Number | UN3077 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 2935.90.4800 |
| Tariff Code | 2935909099 |
Safety & GHS
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Health Hazard
GHS07
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Serious Health Hazard
GHS08
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Hazardous to the Environment
GHS09
Hazard statements
- H315 Causes skin irritation
- H317 May cause an allergic skin reaction
- H319 Causes serious eye irritation
- H335 May cause respiratory irritation
- H361 Suspected of damaging fertility or the unborn child
- H411 Toxic to aquatic life with long lasting effects
Precautionary statements
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P303+P361+P353 IF ON SKIN (or hair): Remove/Take off immediately all contaminated clothing. Rinse skin with water/shower
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- P308+313 IF exposed or concerned: Get medical advice/attention
- P410 Protect from sunlight
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- 4-Amino-N-(5-methyl-3-isoxazolyl)benzenesulfonamide
- 4-amino-N-(5-methylisoxazol-3-yl)benzenesulfonamide
- Gantanol
- Radonil
- Sinomin
- Sulfamethalazole
- Sulfamethoxazol
- Sulfamethylisoxazole
- Sulfisomezole
- Sulphamethoxazole
Frequently asked questions
What is sulfamethoxazole used for?
Sulfamethoxazole is an antibiotic used in the treatment of bacterial infections, often combined with trimethoprim as co-trimoxazole.
What is the chemical formula and molecular weight of sulfamethoxazole?
The formula is C10H11N3O3S with a molecular weight of 253.28 g/mol.
How should sulfamethoxazole be stored?
Store at ambient temperature, protected from light and moisture.
What grade of sulfamethoxazole does Molekula supply?
Molekula supplies sulfamethoxazole in research-grade purity.
Can Molekula supply sulfamethoxazole in bulk quantities?
Yes, Molekula can supply sulfamethoxazole in bulk; please contact us for volume pricing and availability.
What documentation comes with a sulfamethoxazole order?
Each order includes a Certificate of Analysis (CoA) and safety data sheet (SDS).
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.