4-Hydroxy-6-mercaptopyrazolo[3,4-d]pyrimidine

Also known as: 6-Mercapto-1H-pyrazolo[3,4-d]pyrimidin-4-ol, 1,5,6,7-Tetrahydro-6-thioxo-4H-pyrazolo[3,4-d]pyrimidin-4-one, 6-Thioxo-1,5,6,7-tetrahydropyrazolo[3,4-d]pyrimidin-4-one, 4-Hydroxy-6-mercapto-1H-pyrazolo[3,4-d]pyrimidine, 6-Mercaptopyrazolo[3,4-d]pyrimidin-4-ol, 6-Mercapto-4-hydroxy-1H-pyrazolo[3,4-d]pyrimidine, 6-Thioxo-1,2,5,6-tetrahydro-4H-pyrazolo[3,4-d]pyrimidin-4-one, MFCD00022782

4-Hydroxy-6-mercaptopyrazolo[3,4-d]pyrimidine (CAS 24521-76-4) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C5H4N4OS and a molecular weight of 168.17600 g/mol. Key properties include a melting point of >310°C, a boiling point of 334.3ºC at 760mmHg, a density of 2.08g/cm3 and a flash point of 156ºC. No supplier offers are currently listed; request a quote. Record last updated Nov 3, 2026.

CAS No.: 24521-76-4
Jingsj CID: J-15962-6
Molecular Formula: C₅H₄N₄OS
Molecular Weight: 168.17600 g/mol
Category: Pharma Intermediates
Last updated: 11/3/2026

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Physicochemical Properties

Melting Point	>310°C
Boiling Point	334.3ºC at 760mmHg
Density	2.08g/cm3
Flash Point	156ºC
Exact Mass	168.01100
PSA	113.49000
LogP	0.34720
Vapor Pressure	6.66E-05mmHg at 25°C
Refractive Index	2.019

Customs & Trade Information

HS Code	2933990090
Summary	2933990090. heterocyclic compounds with nitrogen hetero-atom(s) only. 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 4-Hydroxy-6-mercaptopyrazolo[3,4-d]pyrimidine?

The CAS number of 4-Hydroxy-6-mercaptopyrazolo[3,4-d]pyrimidine is 24521-76-4.

What are the molecular formula and molecular weight of 4-Hydroxy-6-mercaptopyrazolo[3,4-d]pyrimidine?

4-Hydroxy-6-mercaptopyrazolo[3,4-d]pyrimidine has molecular formula C5H4N4OS and molecular weight 168.17600 g/mol.

What are the upstream and downstream products of 4-Hydroxy-6-mercaptopyrazolo[3,4-d]pyrimidine?

For 4-Hydroxy-6-mercaptopyrazolo[3,4-d]pyrimidine, Upstream Products: 6-Chloro-1,5-dihydro-4H-pyrazolo[3,4-d]pyrimidin-4-one, 3-Amino-4-pyrazolecarboxamide hemisulfate; Downstream Products: 6-(Methylthio)-1H-pyrazolo[3,4-d]pyrimidine, 4-chloro-6-(methylthio)-1H-pyrazolo[3,4-d]pyrimidine.

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

Last updated: 11/3/2026

How to cite: Jingsj. "4-Hydroxy-6-mercaptopyrazolo[3,4-d]pyrimidine (CAS 24521-76-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-15962-6 (accessed 2026-11-09).

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