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

(S)-2-[2-((R)-2-Amino-4-methanesulfinyl-butyrylamino)-acetylamino]-3-phenyl-propionic acid ethyl ester

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

(S)-2-[2-((R)-2-tert-Butoxycarbonylamino-4-methanesulfinyl-butyrylamino)-acetylamino]-3-phenyl-propionic acid ethyl ester

Z-Tyr-D-Met(O)-Gly-Phe-NHNH3

1,3-dioxo-1,3,3a,4,7,7a-hexahydro-2H-4,7-methanoisoindol-2-yl (tert-butoxycarbonyl)methioninate

Z-Tyr-D-Met(O)-Gly-Phe-OEt