3-Methyl-4-pyridinecarboxaldehyde (CAS No.74663-96-0), it also can be called 3-Methylisonicotinaldehyde ; 4-Pyridinecarboxaldehyde, 3-methyl- ; 3-Methyl-pyridine-4-carbaldehyde ; 5-Methylpyridine-4-carboxaldehyde .