142569-99-1 Endothelin-1 (8-21), succinyl-(glu(9),ala(11,15))- Irl 1620 Irl-1620 L-Tryptophan, N-(3-carboxy-1-oxopropyl)-L-alanyl-L-alpha-glutamyl-L-alpha-glutamyl-L-alanyl-L-valyl-L-tyrosyl-L-tyrosyl-L-alanyl-L-histidyl-L-leucyl-L-alpha-aspartyl-L-isoleucyl-L-isoleucyl- Succinyl-(glu(9),ala(11,15))-endothelin-1 (8-21) Succinyl-(glutamyl(9)-alanyl(11,15))-endothelin-1 (8-21)