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7-amino-4-hydroxy-2-naphthalenesulfonic acid

Also known as: J acid, 2-Amino-5-hydroxynaphthalene-7-sulfonic acid, 2-Amino-5-naphthol-7-sulfonic acid, 6-Amino-1-naphthol-3-sulfonic acid, 7-Amino-4-hydroxy-2-naphthalenesulfonic acid, 7-Amino-4-hydroxynaphthalene-2-sulfonic acid, EINECS 201-718-9, MFCD00003970

7-amino-4-hydroxy-2-naphthalenesulfonic acid (CAS 87-02-5) 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 239.24800 g/mol. Key property: a density of 1.627 g/cm3. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
87-02-5
Jingsj CID
J-1503981-7
Molecular Formula
C10H9NO4S
Molecular Weight
239.24800 g/mol
Category
Organic Acids
Last updated
8/21/2026
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Physicochemical Properties

Density1.627 g/cm3
Exact Mass239.02500
PSA109.00000
LogP3.03630
Refractive Index1.748

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 7-amino-4-hydroxy-2-naphthalenesulfonic acid?

The CAS number of 7-amino-4-hydroxy-2-naphthalenesulfonic acid is 87-02-5.

What are the molecular formula and molecular weight of 7-amino-4-hydroxy-2-naphthalenesulfonic acid?

7-amino-4-hydroxy-2-naphthalenesulfonic acid has molecular formula C10H9NO4S and molecular weight 239.24800 g/mol.

What are the upstream and downstream products of 7-amino-4-hydroxy-2-naphthalenesulfonic acid?

For 7-amino-4-hydroxy-2-naphthalenesulfonic acid, Upstream Products: 6-aminonaphthalene-1,3-disulfonic acid, 1,3,6-Naphthalenetrisulfonic acid; Downstream Products: 7-(Acetylamino)-4-hydroxy-2-naphthalenesulfonic acid, 7,7'-Iminobis(4-hydroxy-2-naphthalenesulfonic acid), 6,6'-Ureylene-bis(1-naphthol-3-sulfonic 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. "7-amino-4-hydroxy-2-naphthalenesulfonic acid (CAS 87-02-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1503981-7 (accessed 2026-11-06).

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