1-Nitroso-4-phenylpiperidine 4-Phenylnitrosopiperidine 5-20-06-00419 (Beilstein Handbook Reference) 6652-04-6 BRN 1455807 N-Nitroso-4-phenylpiperidine Nitroso-4-phenylpiperidine Piperidine, 1-nitroso-4-phenyl-