1-Nitroso-4-piperidone 4-PIPERIDINONE, N-NITROSO- 4-Piperidone, 1-nitroso- 5-21-06-00429 (Beilstein Handbook Reference) 55556-91-7 BRN 0113762 CCRIS 5589 N-Nitroso-4-piperidinone Nitroso-4-piperidinone Nitroso-4-piperidone