mercaptopurine

Drug ingredient

CAS 50-44-2

This chemical is an active pharmaceutical ingredient used in FDA-regulated drugs.

US productionNot reported

Import value, 2024$7.6B

Top sourceIreland 61%

This chemical is not on EPA’s Toxic Substances Control Act inventory, the list behind EPA’s production survey.

Why supply is unknown

Production is reported production, not a complete census of factories. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 293359 · basket

These shares come from HS customs code 293359, which covers 295 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries

Country of origin for US imports, from Census customs data (2024).

IE 61%IrelandCH 30%SwitzerlandGB 2%United KingdomCN 2%ChinaIN 1%India

Israel
Bulgaria
Japan
Spain
Sweden
Canada
Taiwan
Finland
Portugal
Mexico
Belgium
Hungary
Austria
Brazil
Ukraine
Croatia
Malta
South Korea
South Africa
Denmark
Czech Republic
Malaysia
Argentina
Poland
Cameroon
Australia
Hong Kong
Slovakia
Latvia

9 FDA-registered drug labelers

Aarti Pharmalabs Limited

Fermion Oy

Florida Pharmaceutical Products, LLC

Golden State Medical Supply, Inc.

Hikma Pharmaceuticals USA Inc.

Mylan Pharmaceuticals Inc.

Nova Laboratories, Ltd

Professional Compounding Centers of America

Zhejiang Cheng Yi Pharmaceutical Co., Ltd.

Why It Matters

Sectors

Health

Downstream Uses

Appears in 2 drug and cosmetic product listings (FDA).

•Mercaptopurine
•Purixan

FDA Shortage Status

Whether any manufacturer currently reports this drug as in shortage on the FDA Drug Shortages database. "Active Shortage" means at least one presentation has status "current."

No FDA shortage records

Vendor Pricing

$0.72/gAK Scientific Specialized

CountryUnited States

Pack$360.00 / 500 g

Purity95%

Vendors13 available

Prices reflect listed pack sizes. Small research packs run far above bulk rates.

12 more vendors

Vendor	Country	$/g	Pack	Purity
AK Scientific, Inc.	United States	$0.96	500 g	98%
Angene Chemical	China → Hong Kong	$0.98	100 g	98%
Aaron Chemicals LLC	Hong Kong	$1.01	100 g	98%
A2B Chem LLC	United States	$1.04	500 g	95%
Angene International Limited	United States	$1.55	500 g	95%
AA BLOCKS	United States	$2.10	10 g	95%
AstaTech (2 weeks)	United States	$8.54	50 g	95%
TargetMol Chemicals	China → United States	$119.00	1 g	99.94%
TargetMol Chemicals EU	Austria	$166.00	500 mg	99.94%
Interbioscreen	Hong Kong	$170.00	10 g	95%
Vitas M Chemical Limited	Hong Kong	$3170.00	100 mg	90%
Angene	China → Hong Kong	$4266.67	30 mg	98%

Chemical Identity

CAS50-44-2

PubChem CID667490

DTXSIDDTXSID0020810

FormulaC5H4N4S

Mol. Weight152.18 g/mol

SMILESC1=NC2=C(N1)C(=S)N=CN2

Data Sources

PubChem · compound 667490Retrieved 2026-04-07
FDA National Drug Code directoryRetrieved 2026-04-25
FDA National Drug Code directoryRetrieved 2026-04-07
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

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Brief citations

mercaptopurine (CAS 50-44-2) https://chemicalindependence.com/chemical/50-44-2/ PubChem: 667490. Retrieved 2026-04-07. https://pubchem.ncbi.nlm.nih.gov/compound/667490 FDA National Drug Code directory: CAS 50-44-2. Retrieved 2026-04-25. https://open.fda.gov/data/ndc/ FDA National Drug Code directory: bulk match. Retrieved 2026-04-07. https://open.fda.gov/data/ndc/ US Census international trade: HS 293359 for CAS 50-44-2. Reporting year: 2024. https://usatrade.census.gov/