Z-Arg(NO2)-Lys(Z)-Asp(OBzl)-Val-Tyr-NHNH-Troc

H-Asp(Bzl)-Met-Glu(Bzl)-Tyr(Bzl)-OMe trifluoroacetic salt

Boc-Asp(Bzl)-Met-Glu(Bzl)-Tyr(Bzl)-OMe