Synonyms: Malononitrile,(o-chlorobenzylidene)- (6CI,7CI,8CI);Propanedinitrile,[(2-chlorophenyl)methylene]- (9CI);(o-Chlorobenzal)malononitrile;(o-Chlorobenzylidene)malononitrile;1-Chloro-2-(2,2-dicyanoethenyl)benzene;2-(o-Chlorophenyl)-1,1-dicyanoethylene;2-Chlorobenzalmalononitrile;2-Chlorobenzylidenemalonodinitrile;2-Chlorobenzylidenemalononitrile;2-[(2-Chlorophenyl)methylene]malononitrile;CS;CS (lacrimator);CS(lacrimitor);NSC 542;NSC 637336;o-Chlorobenzylidenemalonic nitrile;b,b-Dicyano-o-chlorostyrene;