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1H-Isoindol-1-one, 3,3'-[(2,5-dichloro-1,4-phenylene)diimino]bis-

CAS 51016-63-8

Molecular structure of 51016-63-8
US productionNot reported
Import value, 2024$907M
Top sourceIreland 47%

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 293379 · basket

These shares come from HS customs code 293379, which covers 105 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
IE 47%IrelandBE 19%BelgiumSG 11%SingaporeIT 4%ItalyCH 4%Switzerland

Why It Matters

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

Chemical Identity

CAS51016-63-8
PubChem CIDNot recorded
DTXSIDDTXSID5068609
FormulaC22H12Cl2N4O2
Mol. Weight435.26 g/mol
SMILESClC1=CC(NC2=NC(=O)C3=CC=CC=C23)=C(Cl)C=C1NC1=NC(=O)C2=CC=CC=C12

Data Sources

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Brief citations

1H-Isoindol-1-one, 3,3'-[(2,5-dichloro-1,4-phenylene)diimino]bis- (CAS 51016-63-8) https://chemicalindependence.com/chemical/51016-63-8/ EPA TSCA Inventory: CAS 51016-63-8. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 293379 for CAS 51016-63-8. Reporting year: 2024. https://usatrade.census.gov/