![Molecular structure of 2-Hydroxy-5-[(4-sulfophenyl)diazenyl]benzoic acid (CAS 21542-82-5)](/images/chem_structures_svg/059/21542-82-5.svg)
2-Hydroxy-5-[(4-sulfophenyl)diazenyl]benzoic acid
Also known as: Sulfasalazine EP Impurity I, Sulfasalazine Impurity I, 2-Hydroxy-5-((4-sulfophenyl)diazenyl)benzoic acid, 2-Hydroxy-5-[2-(4-sulfophenyl)diazenyl]benzoic acid, Benzoic acid, 2-hydroxy-5-[2-(4-sulfophenyl)diazenyl]-, Mesalazine Impurity 20, Salazopyridine EP Impurity I, Salicylic acid, 5-(4-sulfophenylazo)-, Sulfasalazine Impurity 9(Sulfasalazine EP Impurity I)
2-Hydroxy-5-[(4-sulfophenyl)diazenyl]benzoic acid (CAS 21542-82-5) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C13H10N2O6S and a molecular weight of 322.29300 g/mol. Key property: a density of 1.58g/cm3. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 21542-82-5
- Jingsj CID
- J-1522963-7
- Molecular Formula
- C13H10N2O6S
- Molecular Weight
- 322.29300 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Density | 1.58g/cm3 |
|---|---|
| Exact Mass | 322.02600 |
| PSA | 141.51000 |
| LogP | 2.00490 |
| Refractive Index | 1.675 |
Customs & Trade Information
| HS Code | 2927000090 |
|---|---|
| Summary | 2927000090 other diazo-, azo- or azoxy-compounds。Supervision conditions:None。VAT:17.0%。Tax rebate rate:9.0%。MFN tariff:6.5%。General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of 2-Hydroxy-5-[(4-sulfophenyl)diazenyl]benzoic acid?
The CAS number of 2-Hydroxy-5-[(4-sulfophenyl)diazenyl]benzoic acid is 21542-82-5.
What are the molecular formula and molecular weight of 2-Hydroxy-5-[(4-sulfophenyl)diazenyl]benzoic acid?
2-Hydroxy-5-[(4-sulfophenyl)diazenyl]benzoic acid has molecular formula C13H10N2O6S and molecular weight 322.29300 g/mol.
What are the upstream and downstream products of 2-Hydroxy-5-[(4-sulfophenyl)diazenyl]benzoic acid?
For 2-Hydroxy-5-[(4-sulfophenyl)diazenyl]benzoic acid, Upstream Products: p-Diazobenzenesulfonic acid, Salicylic acid, 2-hydroxy-5-(phenyldiazenyl)benzoic acid; Downstream Products: 5-Aminosalicylic acid, Sulfanilic acid.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "2-Hydroxy-5-[(4-sulfophenyl)diazenyl]benzoic acid (CAS 21542-82-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1522963-7 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.