Mercaptopurine

Also known as: 6-MP, 6-Mercaptopurine, 6-Thiohypoxanthine, Thiopurine, Purinethiol, 1,9-Dihydro-6H-purine-6-thione, 6H-Purine-6-thione, 1,9-dihydro-

Mercaptopurine (CAS 50-44-2) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C5H4N4S and a molecular weight of 152.177 g/mol. Key properties include a melting point of 241-244°C, a boiling point of 490.6±25.0 °C at 760 mmHg, a density of 1.6±0.1 g/cm3 and a flash point of 250.5±23.2 °C. It is classified under GHS with signal word Danger and hazard statements H301 — Toxic if swallowed. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 50-44-2
Jingsj CID: J-17122-3
Molecular Formula: C₅H₄N₄S
Molecular Weight: 152.177 g/mol
Category: Pharma Intermediates
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	241-244°C
Boiling Point	490.6±25.0 °C at 760 mmHg
Density	1.6±0.1 g/cm3
Flash Point	250.5±23.2 °C
Exact Mass	152.015671
PSA	89.45000
LogP	-0.18
Vapor Pressure	0.0±1.2 mmHg at 25°C
Refractive Index	1.820
Storage Conditions	Store at RT

GHS Safety & Compliance

Acute ToxicitySignal word: Danger

H301 — Toxic if swallowed

Activity & Biological Data

Target	endogenous purines[1]
Additional Information	[1]. Sahasranaman S, et al. Clinical pharmacology and pharmacogenetics of thiopurines. Eur J Clin Pharmacol. 2008 Aug;64(8):753-67. [2]. Liu Q, et al. 6-Mercaptopurine augments glucose transport activity in skeletal muscle cells in part via a mechanism dependent upon orphan nuclear receptor NR4A3. Am J Physiol Endocrinol Metab. 2013 Nov 1;305(9):E1081-92. [3]. Kanemitsu H, et al. 6-Mercaptopurine (6-MP) induces cell cycle arrest and apoptosis of neural progenitor cells in the developing fetal rat brain. Neurotoxicol Teratol. 2009 Mar-Apr;31(2):104-9.

Target

endogenous purines[1]

Additional Information

[1]. Sahasranaman S, et al. Clinical pharmacology and pharmacogenetics of thiopurines. Eur J Clin Pharmacol. 2008 Aug;64(8):753-67. [2]. Liu Q, et al. 6-Mercaptopurine augments glucose transport activity in skeletal muscle cells in part via a mechanism dependent upon orphan nuclear receptor NR4A3. Am J Physiol Endocrinol Metab. 2013 Nov 1;305(9):E1081-92. [3]. Kanemitsu H, et al. 6-Mercaptopurine (6-MP) induces cell cycle arrest and apoptosis of neural progenitor cells in the developing fetal rat brain. Neurotoxicol Teratol. 2009 Mar-Apr;31(2):104-9.

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 Mercaptopurine?

The CAS number of Mercaptopurine is 50-44-2.

What are the molecular formula and molecular weight of Mercaptopurine?

Mercaptopurine has molecular formula C5H4N4S and molecular weight 152.177 g/mol.

Is Mercaptopurine hazardous?

Mercaptopurine has GHS signal word Danger and hazard statements H301 — Toxic if swallowed.

What are the upstream and downstream products of Mercaptopurine?

For Mercaptopurine, Upstream Products: Hypoxanthine, 6-Chloropurine, 2,6,8-Trichloropurine; Downstream Products: 6-(Methylthio)purine, 6-morpholinopurine, Purine.

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

Last updated: 8/21/2026

How to cite: Jingsj. "Mercaptopurine (CAS 50-44-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-17122-3 (accessed 2026-11-07).

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