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1(3H)-Isobenzofuranone, 3,3-bis(4-hydroxyphenyl)-, sodium salt (1:2)

CAS 518-51-4

Molecular structure of 518-51-4
2 Na⁺
US productionNot reported
Import value, 2024$286M
Top sourceChina 48%

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 293220 · basket

These shares come from HS customs code 293220, which covers 151 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
CN 48%ChinaIN 15%IndiaJP 7%JapanGB 7%United KingdomCH 7%Switzerland

Why It Matters

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

Vendor Pricing

$21.00/gCombi-Blocks, Inc.
CountryUnited States
Pack$210.00 / 10 g
Purity95%
Vendors1 available

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

Chemical Identity

CAS518-51-4
PubChem CIDNot recorded
DTXSIDDTXSID3060162
FormulaC20H12Na2O4
Mol. Weight362.292 g/mol
SMILES[Na+].[Na+].[O-]C1=CC=C(C=C1)C1(OC(=O)C2=CC=CC=C12)C1=CC=C([O-])C=C1

Data Sources

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Brief citations

1(3H)-Isobenzofuranone, 3,3-bis(4-hydroxyphenyl)-, sodium salt (1:2) (CAS 518-51-4) https://chemicalindependence.com/chemical/518-51-4/ EPA TSCA Inventory: CAS 518-51-4. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 293220 for CAS 518-51-4. Reporting year: 2024. https://usatrade.census.gov/