[1-(Phenylmethoxycarbonylamino)cyclopentanecarbonyl] 1-(phenylmethoxycarbonylamino)cyclopentane-1-carboxylate 生成 tert-butyl 1-[[1-[[1-[[1-[[1-[[1-(phenylmethoxycarbonylamino)cyclopentanecarbonyl]amino]cyclopentanecarbonyl]amino]cyclopentanecarbonyl]amino]cyclopentanecarbonyl]amino]cyclopentanecarbonyl]amino]cyclopentane-1-carboxylate