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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Reference substances

Reference substances

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IUPAC name:
Mixture of octachloro, monomethoxy-heptachloro and bismethoxy-hexachloro derivatives of 3,3'-[(2-methyl-1,3-phenylene)diimino]bis[2,3-dihydro-1H-isoindol-1-one]


CAS number:


Molecular and structural information

Molecular formula:
Mixture of C23H8Cl8N4O2, C24H11Cl7N4O3, C25H14Cl6N4O4
Molecular weight:
647.1 - 656
Structural formula:
Chemical structure

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