1-Methyl-3-(piperidinocarbonyl)piperidine 1-Methyl-3-piperidyl piperidino ketone 40576-23-6 5-22-01-00238 (Beilstein Handbook Reference) BRN 0392857 Ketone, 1-methyl-3-piperidyl piperidino Piperidine, 1-((1-methyl-3-piperidinyl)carbonyl)-