{(S)-1-Benzyl-2-[N'-(3-hydroxy-propionyl)-hydrazino]-2-oxo-ethyl}-carbamic acid benzyl ester

(S)-2-Amino-N-{(R)-1-[({(S)-1-benzyl-2-[N'-(3-hydroxy-propionyl)-hydrazino]-2-oxo-ethylcarbamoyl}-methyl)-carbamoyl]-ethyl}-3-(4-hydroxy-phenyl)-propionamide

[(S)-1-{(R)-1-[({(S)-1-Benzyl-2-[N'-(3-hydroxy-propionyl)-hydrazino]-2-oxo-ethylcarbamoyl}-methyl)-carbamoyl]-ethylcarbamoyl}-2-(4-hydroxy-phenyl)-ethyl]-carbamic acid benzyl ester