[4-[2-[benzyl-[2-[[2-(4-chlorophenyl)acetyl]amino]ethyl]amino]acetyl]-2-(2,2-dimethylpropanoyloxy)phenyl] 2,2-dimethylpropanoate 生成 [4-[2-[2-[[2-(4-chlorophenyl)acetyl]amino]ethylamino]-1-hydroxyethyl]-2-(2,2-dimethylpropanoyloxy)phenyl] 2,2-dimethylpropanoate