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2,3-Dimercapto-1-propanesulfonic acid

Drug ingredient

CAS 74-61-3

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

Molecular structure of 74-61-3
US productionNot reported
Import value, 2024$760M
Top sourceChina 33%

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 293090 · basket

These shares come from HS customs code 293090, which covers 418 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
CN 33%ChinaES 14%SpainCH 9%SwitzerlandIT 7%ItalyIN 7%India
1 FDA-registered drug labeler
DARMERICA, LLC

Why It Matters

Sectors
Health
Downstream UsesNot recorded
FDA Shortage Status
No FDA shortage records

Chemical Identity

CAS74-61-3
PubChem CID6321
DTXSIDDTXSID5048344
FormulaC3H8O3S3
Mol. Weight188.3 g/mol
SMILESC(C(CS(=O)(=O)O)S)S

Data Sources

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Brief citations

2,3-Dimercapto-1-propanesulfonic acid (CAS 74-61-3) https://chemicalindependence.com/chemical/74-61-3/ PubChem: 6321. Retrieved 2026-04-07. https://pubchem.ncbi.nlm.nih.gov/compound/6321 FDA National Drug Code directory: CAS 74-61-3. 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 293090 for CAS 74-61-3. Reporting year: 2024. https://usatrade.census.gov/