[(1S,2R)-2-(dimethylamino)-1-phenylpropyl] (2R,3S)-3-anilino-2-methyl-3-phenylpropanoate 、
[(1S,2R)-2-(dimethylamino)-1-phenylpropyl] (2R,3R)-3-anilino-2-methyl-3-phenylpropanoate 、 [(1S,2R)-2-(dimethylamino)-1-phenylpropyl] (2S,3R)-3-anilino-2-methyl-3-phenylpropanoate 以52%的产率得到