1-(1-Phenylcyclohexyl)-4-hydroxypiperidine (PCHP) is a metabolite of phencyclidine (PCP). PCHP can be detected in the hair, urine, stool, sweat, and saliva of PCP users.
See also 4-Phenyl-4-(1-piperidinyl)cyclohexanol, another PCP metabolite
References