The addition of N-benzyl-3-phenyl-1-methylpropylamine (I) to ethyl 4-(2,3-oxidopropoxy)phenylacetate (II) in refluxing ethanol, followed by debenzylation with H2 over Pd/C gives 1-[4-(ethoxycarbonylmethyl)phenoxyl-3-(1-methyl-3-phenylpropylamino)-2-propanol (III), which is then treated with NH3 in ethanol.