[1-(3,4-Dichlorobenzyl)-2-oxo-1,2-dihydro-3H-indol-3-ylidene]malononitrile;propanedinitrile, 2-[1-[(3,4-dichlorophenyl)methyl]-1,2-dihydro-2-oxo-3H-indol-3-ylidene]-
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