An oily liquid alkaloid, C5H11N, having a hot, peppery, ammoniacal odor. It is related to pyridine, and is obtained by the decomposition of piperine.

Piperidine is an organic compound with the molecular formula C5H11N. It is a heterocyclic amine with a six-membered ring containing five carbon atoms and one nitrogen atom. It is a clear liquid with a pepper-like odor.