L-​α-​Asparagine, N-​acetyl-​L-​cysteinyl-​L-​α-​glutamyl-​L-​histidyl-​3-​(2-​naphthalenyl)​-​D-​alanyl-​L-​arginyl-​L-​tryptophylglycyl-​L-​cysteinyl-​L-​prolyl-​L-​prolyl-​L-​lysyl-​, cyclic (1→8)​-​disulfide