1-Benzyl-4-oxopiperidine 1-Benzyl-4-piperidinone 1-Benzyl-4-piperidone 1-Benzylpiperidone 3612-20-2 4-Piperidinone, 1-(phenylmethyl)- 4-Piperidone, 1-benzyl- N-Benzyl-4-piperidinone N-Benzyl-4-piperidone N-Benzylpiperidin-4-one N-Benzylpiperidinone NSC77933