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6-Amino-4-hydroxy-2-naphthalenesulfonic acid

Also known as: Gamma acid, 7-Amino-1-naphthol-3-sulfonic acid, 2-Amino-8-naphthol-6-sulfonic acid, 6-Amino-4-hydroxynaphthalene-2-sulfonic acid, 4-Hydroxy-6-amino-2-naphthalenesulfonic acid, 2-Naphthalenesulfonic acid, 6-amino-4-hydroxy-

6-Amino-4-hydroxy-2-naphthalenesulfonic acid (CAS 90-51-7) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C10H9NO4S and a molecular weight of 239.248 g/mol. Key property: a density of 1.6±0.1 g/cm3. 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 Aug 21, 2026.

CAS No.
90-51-7
Jingsj CID
J-1409797-7
Molecular Formula
C10H9NO4S
Molecular Weight
239.248 g/mol
Category
Organic Acids
Last updated
8/21/2026
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Physicochemical Properties

Density1.6±0.1 g/cm3
Exact Mass239.025223
PSA109.00000
LogP-1.46
Refractive Index1.748

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 6-Amino-4-hydroxy-2-naphthalenesulfonic acid?

The CAS number of 6-Amino-4-hydroxy-2-naphthalenesulfonic acid is 90-51-7.

What are the molecular formula and molecular weight of 6-Amino-4-hydroxy-2-naphthalenesulfonic acid?

6-Amino-4-hydroxy-2-naphthalenesulfonic acid has molecular formula C10H9NO4S and molecular weight 239.248 g/mol.

Is 6-Amino-4-hydroxy-2-naphthalenesulfonic acid hazardous?

6-Amino-4-hydroxy-2-naphthalenesulfonic 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 6-Amino-4-hydroxy-2-naphthalenesulfonic acid?

For 6-Amino-4-hydroxy-2-naphthalenesulfonic acid, Upstream Products: 7-Amino-1,3-naphthalenedisulfonic acid, Ammonia; Downstream Products: 5-Hydroxy-2-methylbenzoic acid, 6-acetamido-4-hydroxy-2-naphthalenesulfonic acid, 1,7-Naphthalenediol.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated:

How to cite: Jingsj. "6-Amino-4-hydroxy-2-naphthalenesulfonic acid (CAS 90-51-7)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1409797-7 (accessed 2026-11-06).

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