(S)-4-Amino-4-{(S)-2-carbamoyl-1-[(S)-2-(4-hydroxy-phenyl)-1-methoxycarbonyl-ethylcarbamoyl]-ethylcarbamoyl}-butyric acid

Z(OMe)-Thr-Glu-Asn-Tyr-OMe

(S)-2-((S)-2-Amino-3-carbamoyl-propionylamino)-3-(4-hydroxy-phenyl)-propionic acid methyl ester

Z(OMe)-Glu(OBzl)-Asn-Tyr-OMe

Z(OMe)-Asn-Tyr-OMe