5-{2-[2-(3-chloro-phenyl)-2-hydroxy-ethylamino]-propyl}-benzo[1,3]dioxole-2,2-dicarboxylic acid bis-(1-phenyl-ethyl) ester                                                                                                                                                                                                                                                                                                          以22%的产率得到5-{(2R)-2-[(2R)-2-(3-Chloro-phenyl)-2-hydroxy-ethylamino]-propyl}benzo[1,3]dioxole-2,2-dicarboxylic acid (1-phenyl-ethyl) ester