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thioguanine

Drug ingredient

CAS 154-42-7

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

Molecular structure of 154-42-7
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
IE 61%IrelandCH 30%SwitzerlandGB 2%United KingdomCN 2%ChinaIN 1%India
3 FDA-registered drug labelers
AMERICAN PACIFIC CORPORATION
Excella GmbH & Co. KG
Waylis Therapeutics LLC

Why It Matters

Sectors
Health
Downstream Uses

Appears in 1 drug and cosmetic product listings (FDA).

  • •Tabloid
FDA Shortage Status
No FDA shortage records

Vendor Pricing

$3.84/gCombi-Blocks, Inc.
CountryUnited States
Pack$1920.00 / 500 g
Purity98%
Vendors11 available

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

10 more vendors
VendorCountry$/gPackPurity
A2B Chem LLCUnited States$4.0025 g98%
AA BLOCKSUnited States$4.28500 g98%
Aaron Chemicals LLCHong Kong$4.42100 g98%
Angene ChemicalChina → Hong Kong$4.74100 g98%
Ambeed, Inc.United States$4.80100 g98%
Angene International LimitedUnited States$14.0825 g98%
MolnovaChina$130.00500 mg99%
Apexbio Technology LLCUnited States$180.00500 mg98.18%
AngeneChina → Hong Kong$4266.6730 mg98%
TimTec, LLC (back-ordered)United States$32000.0015 mg94%

Chemical Identity

CAS154-42-7
PubChem CID2723601
DTXSIDDTXSID6023652
FormulaC5H5N5S
Mol. Weight167.19 g/mol
SMILESC1=NC2=C(N1)C(=S)N=C(N2)N

Data Sources

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Brief citations

thioguanine (CAS 154-42-7) https://chemicalindependence.com/chemical/154-42-7/ PubChem: 2723601. Retrieved 2026-04-07. https://pubchem.ncbi.nlm.nih.gov/compound/2723601 FDA National Drug Code directory: CAS 154-42-7. 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 154-42-7. Reporting year: 2024. https://usatrade.census.gov/