.alpha.-Chloro-p-chloroacetophenone .omega.-Chloro-p-chloroacetophenone 2,4'-Dichloroacetophenone 4-Chlorophenacyl chloride 937-20-2 Acetophenone, 2,4'-dichloro- Ethanone, 2-chloro-1-(4-chlorophenyl)- NSC41669 p-Chlorophenacyl chloride