Molekula
N-Acetyl-L-cysteine
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
N-Acetyl-L-cysteine is a derivative of the amino acid L-cysteine used as a mucolytic agent and antioxidant, commonly in respiratory therapies and detoxification protocols. It has a CAS number of 616-91-1, molecular formula of HSCH₂CH(NHCOCH₃)CO₂H, and a molecular weight of 163.19 g/mol. Store at 2 to 8 °C. Signal word: Warning. Molekula supplies N-Acetyl-L-cysteine 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.
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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50 g — $104.50 per pack
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100 g — $123.50 per pack
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500 g — $513.20 per pack
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 crystalline powder |
| Melting Point | 106 - 112°C |
| Specific rotation | +21° - +25° |
| Heavy metals | <10ppm |
| pH | 2.0 - 2.8 |
| Loss on Drying | max 1.0% |
| Assay | 98% min |
| Residue on Ignition | max .5% |
| Iron (Fe) | <20ppm |
| Arsenic (As) | <1ppm |
| Ammonium (NH4+) | <0.02% |
| Sulphates (SO4)(2-) | <0.03% |
| State of Solution | >98% |
| Chlorine (Cl) | <0.04% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | 2 to 8 °C |
| Acidity | Acid |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | White, crystalline powder |
| Odour | Slight acetic odor |
| Melting Point | 109.5 °C |
| Solubility (other solvents) | Soluble in water, alcohol, hot isopropyl alcohol, methyl acetate, and ethyl acetate |
| Vapour Pressure | 1.1 × 10⁻⁵ mmHg at 25 °C (Estimated) |
| pKa | pKa = 9.52 (at 25 °C) |
| log P (octanol/water) | -0.66 |
Source: PubChem CID 12035 (HSDB, DrugBank)
Identification
| Property | Value |
|---|---|
| SKU | 11557293 |
| CAS Number | 616-91-1 |
| IUPAC Name | (2R)-2-acetamido-3-sulfanylpropanoic acid |
| EC Number | 210-498-3 |
| Molecular Formula | HSCH2CH(NHCOCH3)CO2H |
| Molecular Weight | 163.19 |
| Exact Mass | 163.0303 |
| SMILES | CC(=O)N[C@@H](CS)C(=O)O |
| InChIKey | PWKSKIMOESPYIA-BYPYZUCNSA-N |
| InChI | InChI=1S/C5H9NO3S/c1-3(7)6-4(2-10)5(8)9/h4,10H,2H2,1H3,(H,6,7)(H,8,9)/t4-/m0/s1 |
| PubChem CID | 12035 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 29309016 |
| Tariff Code | 2930901600 |
Safety & GHS
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Health Hazard
GHS07
Hazard statements
- H319 Causes serious eye irritation
Precautionary statements
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- 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
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
- Acetadote
- Acetilcisteina
- acetylcysteine
- Acetylcysteinum
- Brunac
- Fluimucetin
- L-Acetylcysteine
- mercapturic acid
- N-Acetylcysteine
- Respaire
Frequently asked questions
What is N-Acetyl-L-cysteine used for?
N-Acetyl-L-cysteine is commonly used as a mucolytic agent to break down mucus and as a precursor to glutathione for antioxidant support.
What is the chemical formula and molecular weight of N-Acetyl-L-cysteine?
The formula is HSCH2CH(NHCOCH3)CO2H and the molecular weight is 163.19 g/mol.
How should N-Acetyl-L-cysteine be stored?
It should be stored at 2 to 8 °C to maintain stability and prevent degradation.
What grade of N-Acetyl-L-cysteine does Molekula supply?
Molekula supplies N-Acetyl-L-cysteine in research grade, suitable for laboratory use.
Can Molekula supply N-Acetyl-L-cysteine in bulk quantities?
Yes, Molekula can supply N-Acetyl-L-cysteine in bulk; please contact our sales team for volume pricing and availability.
What documentation comes with an order of N-Acetyl-L-cysteine?
Each order includes a Certificate of Analysis (CoA) and safety data sheet (SDS) with the shipment.
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.