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Pyridine-4-sulfonic acid

Also known as: 4-Pyridinesulfonic acid, 4-Pyridinesulphonic acid, 4-Sulphopyridine, NSC 5082, Pyridine-4-sulphonic acid, TAK438 Impurity 30, TAK438 Impurity 154, Vonoprazan Impurity 154

Pyridine-4-sulfonic acid (CAS 5402-20-0) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C5H5NO3S and a molecular weight of 159.16300 g/mol. Key properties include a melting point of 330ºC (DEC.) and a density of 1.509g/cm3. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
5402-20-0
Jingsj CID
J-1000245-6
Molecular Formula
C5H5NO3S
Molecular Weight
159.16300 g/mol
Category
Pharma Intermediates
Last updated
8/21/2026
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Physicochemical Properties

Melting Point330ºC (DEC.)
Density1.509g/cm3
Exact Mass158.99900
PSA75.64000
LogP1.40910
Refractive Index1.689

Customs & Trade Information

HS Code2933399090
Summary2933399090. other compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

Frequently Asked Questions

What is the CAS number of Pyridine-4-sulfonic acid?

The CAS number of Pyridine-4-sulfonic acid is 5402-20-0.

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

Pyridine-4-sulfonic acid has molecular formula C5H5NO3S and molecular weight 159.16300 g/mol.

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

For Pyridine-4-sulfonic acid, Upstream Products: 4-Mercaptopyridine, 4,4'-Dithiodipyridine, 1-(4-Pyridyl)pyridinium chloride hydrochloride; Downstream Products: 4(1H)-Pyridinone, 4-chloropyridine.

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

Last updated:

How to cite: Jingsj. "Pyridine-4-sulfonic acid (CAS 5402-20-0)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1000245-6 (accessed 2026-11-09).

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