IRL-1620, HUMAN IRL-1620 ENDOTHELIN-1(8-21), N-SUC-[GLU9, ALA11,15] N-SUC-[GLU9, ALA11,15]ENDOTHELIN-I (8-21) N-SUCCINYL-[GLU9, ALA11,15]-ENDOTHELIN, 8-21 SUC-ASP-GLU-GLU-ALA-VAL-TYR-PHE-ALA-HIS-LEU-ASP-ILE-ILE-TRP SUC-ASP-GLU-GLU-ALA-VAL-TYR-PHE-ALA-HIS-LEU-ASP-ILE-ILE-TRP-OH SUCCINYL-(GLU9,ALA11,15)-ENDOTHELIN-1 (8-21)