?N-Methyl-4-piperidone (CAS NO.1445-73-4), its Synonyms are 4-Piperidinone,1-methyl- ; 1-Methyltetrahydropyridin-4(1H)-one- ; N-Methyl-4-piperidone ; 4-Piperidone,1-methyl- (6CI,7CI,8CI) .