((2-Chloro-4-nitrophenyl)hydrazono)propanedinitrile 3780-92-5 BRN 1823244 Carbonyl cyanide-4-nitro-2-chlorophenylhydrazone Mesoxalonitrile, (2-chloro-4-nitrophenyl)hydrazone Propanedinitrile, ((2-chloro-4-nitrophenyl)hydrazono)-