1-Propylpiperidin-4-on , with CAS number of 23133-37-1, can be called 4-piperidinone, 1-propyl- ; 1-Propylpiperidin-4-one ; 1-Propyl-4-piperidinone ; 1-Propyl-piperidin-4-one ; n-Propyl-4-piperidone . It is a clear yellow liquid.