tert-butyl (S)-3-amino-4-oxo-2,3,4,5-tetrahydro-1,5-benzoxazepine-5-acetate

ethyl 7-(1-benzyloxycarbonyl-4-piperidyl)-2-oxoheptanoate

benzyl 4-(6-ethoxy-6-oxohexyl)piperidine-1-carboxylate