. "1N-(1-carbamoyl-2-hydroxypropyl)-15-[3-amino(imino)methylaminopropyl]-6-(1-amino-2-phenylethylcarboxamido)-12-benzyl-18-(1H-3-indolylmethyl)-9-(2-methyl-1H-5-imidazolylmethyl)-7,10,13,16,19-pentaoxo-3,4-dithia-8,11,14,17,20-pentaazacycloicosane-1" . "10" . . . . . . . . .