Molekula
4-Aminosalicylic acid
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
4-Aminosalicylic acid is a pharmaceutical intermediate used in the synthesis of anti-tuberculosis drugs. It also serves as a building block in the manufacture of bromopride, metoclopramide and xipamide, and as an industrial preservative. It is a white to pale yellow crystalline powder with a molecular formula of C7H7NO3 and a molecular weight of 153.14 g/mol. It has a CAS number of 65-49-6 and should be stored at ambient temperatures. The substance is classified with a warning signal word. Molekula supplies 4-Aminosalicylic acid 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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100 g — £24.80 per pack ex VAT · £29.76 inc. VAT
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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 slightly yellow, or almost white to beige powder |
| Melting Point | 143°C |
| Water | ≤0.5% |
| Heavy metals | ≤30ppm |
| pH | 3.0 - 3.7 |
| Chloride (Cl-) | ≤0.042% |
| Residue on Ignition | ≤0.2% |
| Assay HPLC | ≥97.0% |
| m-aminophenol content | ≤0.25% |
| Version | To report |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | White, or nearly white, bulky powder |
| Odour | Odorless, or has slight acetous odor |
| Melting Point | 150-151 °C, with effervescence |
| Solubility (other solvents) | Soluble in acetone |
| Vapour Pressure | 0.000004 mmHg |
| pKa | pKa = 2.05 (at 25 °C) |
Source: PubChem CID 4649 (HSDB, Haz-Map, DrugBank)
Identification
| Property | Value |
|---|---|
| SKU | 27215046 |
| CAS Number | 65-49-6 |
| IUPAC Name | 4-amino-2-hydroxybenzoic acid |
| EC Number | 200-613-5 |
| Molecular Formula | C7H7NO3 |
| Molecular Weight | 153.14 |
| Exact Mass | 153.0426 |
| SMILES | C1=CC(=C(C=C1N)O)C(=O)O |
| InChIKey | WUBBRNOQWQTFEX-UHFFFAOYSA-N |
| InChI | InChI=1S/C7H7NO3/c8-4-1-2-5(7(10)11)6(9)3-4/h1-3,9H,8H2,(H,10,11) |
| PubChem CID | 4649 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 2922.50.5000 |
| Tariff Code | 2922500090 |
Safety & GHS
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Health Hazard
GHS07
Hazard statements
- H315 Causes skin irritation
- H319 Causes serious eye irritation
- H335 May cause respiratory irritation
Precautionary statements
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P302+P350 IF ON SKIN: Gently wash with soap and water
- P304+P341 IF INHALED: If breathing is difficult, remove victim to fresh air and keep at rest in a position comfortable for breathing
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- P308+P313 IF exposed or concerned: Get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, German, Spanish, French, Italian, Portuguese, Arabic, Dutch.
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-2-hydroxybenzoic acid
- Aminosalicylic acid
- Apacil
- Deapasil
- Gabbropas
- P-AMINOSALICYLIC ACID
- Paramycin
- Parasal
- Parasalindon
- Paser
Frequently asked questions
What is 4-Aminosalicylic acid used for?
4-Aminosalicylic acid (PAS) is itself an antitubercular agent, used as a second-line drug in the treatment of tuberculosis, including multidrug-resistant tuberculosis, and in related pharmaceutical research.
What is the chemical formula and molecular weight of 4-Aminosalicylic acid?
The formula is C7H7NO3 with a molecular weight of 153.14 g/mol.
How should 4-Aminosalicylic acid be stored?
It should be stored at ambient temperature, protected from moisture and light.
What grade is available for 4-Aminosalicylic acid?
Available in research grade; specific technical or pharmaceutical grades may be available upon request.
Can Molekula supply 4-Aminosalicylic acid in bulk?
Yes, bulk quantities are available—please contact our sales team for pricing and availability.
What documentation comes with an order of 4-Aminosalicylic acid?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS); additional documentation can be provided upon request.
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.