N2-[3-(1-Naphthalenyl)-2-(1-naphthalenylmethyl)-1-oxopropyl]-N6-benzyloxycarbonyl-L-Lys-[(3S,4S)-3-hydroxy-4-(2-methylpropyl)-γAbu-]-L-Leu-benzyl NH2

(4S,8S,9S,12S)-12-[2-(1-Naphtylmethyl)-3-(1-naphtyl)propionylamino]-3,6,11-trioxo-4,9-diisobutyl-8-hydroxy-1-phenyl-2,5,10,17-tetraazaoctadecane-18-oic acid benzyl ester