2(S)-3-(2-aminophenoxy)-2-((tert-butoxycarbonyl)amino)propanoic acid

(S)-2-((tert-butoxycarbonyl)amino)-3-(2-nitrophenoxy)propanoic acid

3(S)-benzyloxycarbonylamino-2,3,4,5-tetrahydro-1,5-benzoxazepine-4-one

ethyl 4-cyclohexyl-2-oxo-butyrate

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