SEARCH Articles Figures Tables 1-Phenylpiperidine 1-Phenylpiperidine 1.2- Dimethyl-4-phenylpiperidin 4- Phenylpiperidine analogue 4-hydroxy-4-phenylpiperidines Hydroxy-2-phenylpiperidine L-Methyl-4-phenylpiperidine Morphine, Morphinan, and Benzomorphan 4-Phenylpiperidines N-Phenylpiperidine from sodium benzenesulfonate and piperidine Phenylpiperidine analgesics Phenylpiperidine class Sodium benzenesulfonate, reaction with piperidine to form N-phenylpiperidine