(3S)-1-chloro-2-hydroxy-3-N-benzyloxycarbonylamino-4-phenylbutane

ethyl (S)-4-benzyloxycarbonylamino-3-oxo-5-phenylpentanoate

(S)-N-Benzyloxycarbonyl-phenylalanine-N'-methylamide

Z-Phe-Val-OBut

Boc-Phe-OPet