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2-Aminophenol-4-sulfonic acid

Also known as: 3-Amino-4-hydroxybenzenesulfonic acid, APS, 4-Hydroxy-3-aminobenzenesulfonic acid, Benzenesulfonic acid, 3-amino-4-hydroxy-, 2-Amino-1-phenol-4-sulfonic acid, 2-Aminophenol-4-sulfonic acid hydrate, 3-Amino-4-hydroxybenzenesulfonic acid semihydrate

2-Aminophenol-4-sulfonic acid (CAS 98-37-3) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C6H7NO4S and a molecular weight of 189.18900 g/mol. Key property: a melting point of ≥300 °C(lit.). It is classified under GHS with signal word Danger and hazard statements H314 — Causes severe skin burns and eye damage. No supplier offers are currently listed; request a quote. Record last updated Nov 3, 2026.

CAS No.
98-37-3
Jingsj CID
J-1135703-2
Molecular Formula
C6H7NO4S
Molecular Weight
189.18900 g/mol
Category
Organic Acids
Last updated
11/3/2026
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Physicochemical Properties

Melting Point≥300 °C(lit.)
Exact Mass189.01000
PSA109.00000
LogP1.88310
Additional Property<0.1 g/100 mL at 21.5 ºC

GHS Safety & Compliance

CorrosionSignal word: Danger
  • H314 — Causes severe skin burns and eye damage

Customs & Trade Information

HS Code2922299090
Summary2922299090. other amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:30.0%

Frequently Asked Questions

What is the CAS number of 2-Aminophenol-4-sulfonic acid?

The CAS number of 2-Aminophenol-4-sulfonic acid is 98-37-3.

What are the molecular formula and molecular weight of 2-Aminophenol-4-sulfonic acid?

2-Aminophenol-4-sulfonic acid has molecular formula C6H7NO4S and molecular weight 189.18900 g/mol.

Is 2-Aminophenol-4-sulfonic acid hazardous?

2-Aminophenol-4-sulfonic acid has GHS signal word Danger and hazard statements H314 — Causes severe skin burns and eye damage.

What are the upstream and downstream products of 2-Aminophenol-4-sulfonic acid?

For 2-Aminophenol-4-sulfonic acid, Upstream Products: 4-Chloro-3-nitrobenzenesulfonic acid, 2-Aminophenol; Downstream Products: 2-Amino-6-nitrophenol-4-sulfonic acid, 8-Hydroxyquinoline-5-sulfonic acid, 3-Amino-4-hydroxy-N-phenylbenzenesulfonamide.

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-Aminophenol-4-sulfonic acid (CAS 98-37-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1135703-2 (accessed 2026-11-09).

Data for reference only; verify product details with suppliers before purchase.