3-Cyano-4-fluorobenzaldehyde (CAS No.218301-22-5), it also can be called 2-Fluoro-5-formylbenzonitrile ; 2-Fluoro-5-formyl-benzonitrile ; Benzonitrile, 2-fluoro-5-formyl- ; 4-Fluoro-3-cyanobenzaldehyde .