anileridine1-[2-(4-aminophenyl)ethyl]-4-phenyl-4-piperidinecarboxlic acid ethyl esterN-(beta-(p-aminophenyl)ethyl)-4-phenyl-4-carbethoxypiperidineN-beta-(p-aminophenyl)ethylnormeperidineethyl 1-(2-(4-aminophenyl)ethyl)-4-phenyl-4-piperidinecarboxylateethyl 1-(4-aminophenethyl)-4-phenylisonipecotateethyl 1-(p-aminophenethyl)-4-phenylisonipecotate