cyclo<-Tyr-Arg(NO2)-Lys(Z)-Asp(OBzl)-D-Val->

H-Tyr-Arg-NO2-Lys-Z-Asp-OBzl-L-Val-Y*TFA

H-Tyr-Arg-NO2-Lys-Z-Glu-OBzl-L-Val-Y*TFA