4-Amino-3-methylbenzenesulfonic acid
Also known as: 2-Aminotoluene-5-sulfonic acid, 2-Toluidine-5-sulfonic acid, 4-Amino-m-toluenesulfonic acid, 6-Amino-m-toluenesulfonic acid, 2-Amino-toluene-4-sulfonic acid, o-Toluidine-4-sulfonic acid, 6-Aminotoluene-3-sulfonic acid, OTS
4-Amino-3-methylbenzenesulfonic acid (CAS 98-33-9) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C7H9NO3S and a molecular weight of 187.216 g/mol. Key properties include a melting point of 290°C and a density of 1.4±0.1 g/cm3. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 98-33-9
- Jingsj CID
- J-33119-1
- Molecular Formula
- C7H9NO3S
- Molecular Weight
- 187.216 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 290°C |
|---|---|
| Density | 1.4±0.1 g/cm3 |
| Exact Mass | 187.030319 |
| PSA | 88.77000 |
| LogP | -0.05 |
| Refractive Index | 1.610 |
Customs & Trade Information
| HS Code | 2921430090 |
|---|---|
| Summary | HS:2921430090 toluidines and their derivatives; salts thereof VAT:17.0% Tax rebate rate:9.0% Supervision conditions:none MFN tariff:6.5% General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of 4-Amino-3-methylbenzenesulfonic acid?
The CAS number of 4-Amino-3-methylbenzenesulfonic acid is 98-33-9.
What are the molecular formula and molecular weight of 4-Amino-3-methylbenzenesulfonic acid?
4-Amino-3-methylbenzenesulfonic acid has molecular formula C7H9NO3S and molecular weight 187.216 g/mol.
What are the upstream and downstream products of 4-Amino-3-methylbenzenesulfonic acid?
For 4-Amino-3-methylbenzenesulfonic acid, Upstream Products: o-Toluidine, 2-Nitrotoluene, N,N'-Di(o-tolyl)urea; Downstream Products: 4-acetylamino-3-methylbenzenesulfonyl chloride, o-Toluidine, Acetamide, N-[4-(aminosulfonyl)-2-methylphenyl]-.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "4-Amino-3-methylbenzenesulfonic acid (CAS 98-33-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-33119-1 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.