(2-Oxo-1,2-dihydro-3H-indol-3-ylidene)malononitrile;2-(2-oxo-2,3-dihydro-1H-indol-3-yliden)malononitrile;propanedinitrile, 2-(1,2-dihydro-2-oxo-3H-indol-3-ylidene)-
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