Prudence Lifecare Pvt. Ltd.
4-Hydroxy Pyridine 3 Sulfonic Acid
Manufactured and supplied from our WHO-GMP, GLP and ISO 9001:2015 certified facility in Ankleshwar, Gujarat, India. This is the upstream pyridine building block in the Torsemide synthesis route, feeding into 4-(3-Methylphenyl)Amino-3-Pyridine Sulfonamide before final conversion to Torsemide.
- CAS Number
- 51498-37-4
- PubChem CID
- 3016673
- Molecular Weight
- 175.16 g/mol
- Product Type
- API Intermediate
What is this intermediate?
4-Hydroxy Pyridine 3 Sulfonic Acid — also known as 4-Pyridinol-3-sulfonic Acid — is documented industry-wide (patent literature and reference-standard suppliers, where it is also cataloged as Torasemide Impurity 24) as an upstream building block in Torsemide synthesis. It is converted, via chlorination and amidation, into 4-(3-Methylphenyl)Amino-3-Pyridine Sulfonamide — also manufactured by Prudence Lifecare — which then reacts with isopropyl isocyanate to give the finished Torsemide API.
Application
- Torsemide synthesis — upstream intermediate
- Loop diuretic API manufacturing
- Custom synthesis & CDMO supply
- Pharmaceutical research & QC reference
Chemical & technical data
Full verified identifiers for this intermediate, cross-checked against PubChem and supplier reference data.
| Product Name | 4-Hydroxy Pyridine 3 Sulfonic Acid |
|---|---|
| CAS Number | 51498-37-4 |
| PubChem CID | 3016673 |
| Molecular Formula | C5H5NO4S |
| Molecular Weight | 175.16 g/mol |
| Melting Point | >300 °C |
| IUPAC Name | 4-oxo-1H-pyridine-3-sulfonic acid |
| InChIKey | AZRCSTMIVMQIPR-UHFFFAOYSA-N |
| Product Type | Active Pharmaceutical Ingredient (API) intermediate |
| Downstream API | Torsemide (CAS 56211-40-6) |
Chemical identity data sourced and cross-verified via PubChem (CID 3016673). Also listed industry-wide as Torasemide Impurity 24. Specification, purity grade, packaging and Certificate of Analysis details available on request.
Manufacturing & supply
Prudence Lifecare Pvt. Ltd., Unit-II of Prudence Pharma Chem (established 2003), is a WHO, GMP, GLP and ISO 9001:2015 certified Active Pharmaceutical Ingredient and intermediates manufacturer based in GIDC Ankleshwar, Gujarat, India. This intermediate is manufactured under the same quality systems that govern our full API and intermediates portfolio, supplying formulation companies, API manufacturers and contract manufacturers across India and exporting to Asia, Europe, Africa and the Middle East.
Quality, certifications & documentation
- WHO-GMP, GLP, ISO 9001:2015 and ISO 14001 certified facility
- Certificate of Analysis (CoA) available on request
- Custom purity/particle-size specifications available on request
Why choose Prudence Lifecare
- WHO, GMP, GLP and ISO-certified facility in Ankleshwar, Gujarat, India
- In-house manufacture of both major Torsemide synthesis intermediates
- Also the manufacturer of the finished Torsemide API
- Export experience across Asia, Europe, Africa and the Middle East
- Custom synthesis and contract manufacturing (CDMO) capability
Frequently asked questions
What is 4-Hydroxy Pyridine 3 Sulfonic Acid used for?
It is an upstream building block for Torsemide, converted into 4-(3-Methylphenyl)Amino-3-Pyridine Sulfonamide before final conversion to the finished API.
What is the CAS number of this intermediate?
51498-37-4.
What is the molecular formula of this intermediate?
C5H5NO4S.
What is the molecular weight of this intermediate?
175.16 g/mol.
What is the PubChem CID of this intermediate?
3016673.
Who manufactures this intermediate in India?
Prudence Lifecare Pvt. Ltd. manufactures this intermediate at its WHO-GMP certified facility in Ankleshwar, Gujarat, India.
What other Torsemide intermediate does Prudence Lifecare manufacture?
Prudence Lifecare also manufactures 4-(3-Methylphenyl)Amino-3-Pyridine Sulfonamide (CAS 72811-73-5), the direct, final-step precursor to Torsemide.
Does Prudence Lifecare also manufacture the finished Torsemide API?
Yes, Prudence Lifecare manufactures Torsemide (CAS 56211-40-6) to IP, BP, EP and USP standards.
Does Prudence Lifecare export this intermediate internationally?
Yes, Prudence Lifecare exports its API and intermediates portfolio to Asia, Europe, Africa and the Middle East.
How can I request a quote or technical documentation?
Use the "Request a quote" button on this page or visit our Contacts page.
Need pricing, a Certificate of Analysis, or technical documentation for this intermediate?
Contact our export sales team