(R)-2-[(S)-2-Amino-3-(4-hydroxy-phenyl)-propionylamino]-4-methyl-pentanoic acid {[(S)-1-benzyl-2-(N'-butyryl-hydrazino)-2-oxo-ethylcarbamoyl]-methyl}-amide

Z-Tyr-D-Leu-Gly-OH

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

Butyric acid N'-((S)-2-amino-3-phenyl-propionyl)-hydrazide