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1,3-Benzenedicarboxylic acid, 5-sulfo-, 1,3-dimethyl ester, sodium salt (1:1)

CAS 3965-55-7

Molecular structure of 3965-55-7
1 Na⁺
US productionNot reported
Import value, 2024$316M
Top sourceSouth Korea 19%

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 291739 · basket

These shares come from HS customs code 291739, which covers 103 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
KR 19%South KoreaCN 19%ChinaIN 18%IndiaES 13%SpainCA 9%Canada

Why It Matters

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

Chemical Identity

CAS3965-55-7
PubChem CIDNot recorded
DTXSIDDTXSID6027551
FormulaC10H9NaO7S
Mol. Weight296.22 g/mol
SMILES[Na+].COC(=O)C1=CC(=CC(=C1)C(=O)OC)S([O-])(=O)=O

Data Sources

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Brief citations

1,3-Benzenedicarboxylic acid, 5-sulfo-, 1,3-dimethyl ester, sodium salt (1:1) (CAS 3965-55-7) https://chemicalindependence.com/chemical/3965-55-7/ EPA TSCA Inventory: CAS 3965-55-7. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 291739 for CAS 3965-55-7. Reporting year: 2024. https://usatrade.census.gov/