(1-Ethylbenz(cd)indol-2(1H)-ylidene)malononitrile (1-Ethylbenz(cd)indol-2(1H)-ylidene)propanedinitrile 57232-94-7 EINECS 260-637-7 Propanedinitrile, (1-ethylbenz(cd)indol-2(1H)-ylidene)-