1-Phenethyl-3-methyl-4-(N-propionylanilino)piperidine

N-Phenyl-N-(1-phenethyl-3-methyl-4-piperidinyl)propanamide

N-(3-Methyl-1-phenethylpiperidin-4-yl)-N-phenylpropionamide

N-[3-Methyl-1-(2-phenylethyl)-4-piperidinyl]-N-phenyl-propanamide