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Pyridine sulfate (1:1)

CAS 543-54-4

Pyridine, sulfate (1:1)

Molecular structure of 543-54-4
US productionNot reported
Import value, 2024$16M
Top sourceIndia 60%

This chemical is listed as active in US commerce, but no company reported it to EPA’s survey for 2019 or 2023. Sites may have made or imported less than the threshold amount, or none.

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 293331 · basket

These shares come from HS customs code 293331, which covers 11 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
IN 60%IndiaKR 13%South KoreaCA 10%CanadaCN 7%ChinaJP 3%Japan

Why It Matters

No EPA sector or FDA product records name a use for this chemical.

Chemical Identity

CAS543-54-4
PubChem CIDNot recorded
DTXSIDDTXSID901033225
FormulaC5H7NO4S
Mol. Weight177.17 g/mol
SMILESOS([O-])(=O)=O.C1=CC=[NH+]C=C1

Data Sources

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Brief citations

Pyridine sulfate (1:1) (CAS 543-54-4) https://chemicalindependence.com/chemical/543-54-4/ EPA TSCA Inventory: CAS 543-54-4. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 293331 for CAS 543-54-4. Reporting year: 2024. https://usatrade.census.gov/