(+-)-Anileridine hydrochloride 1-(2-(4-Aminophenyl)ethyl)-4-phenyl-4-piperidinecarboxylic acid ethyl ester hydrochloride 144-14-9 4-Piperidinecarboxylic acid, 1-(2-(4-aminophenyl)ethyl)-4-phenyl-, ethyl ester, monohydrochloride 53421-22-0