H , 할로 , - NO 2 , - CN , - O - R 12 , - C ( O ) - R 12 , - C ( O ) - N ( R 12 ) ( R 12 ) , - N ( R 12 ) ( R 12 ) , - N ( R 12 ) C ( O ) - R 12 , - N ( R 12 ) C ( O ) O - R 12 , 또는 - N ( R 12 ) S ( O ) 2 ( R 12 ) ;