“…Piperidine (Pip) is a normal constituent of brain (1,2,3,4,5,6,7), skin (8,9) and urine (3,10) of mammals, and of the brain (11), cerebrospinal fluid (12), and urine (3,10,13) of humans, and of cerebral ganglia of molluscs (14). Pip shows potent nicotine-like actions on the peripheral (15,16,17) and central nervous systems (CNS) (18,19). Pip acts on the autonomic ganglia, neuromuscular junctions and chemoreceptors, i.e., it elicits stimulation in small doses and depression in large doses.…”