(4R,7S,10S,13S,16S,19R)-10-(4-aminobutyl)-16-benzyl-7-[(1R)-1-hydroxyethyl]-13-(1H-indol-3-ylmethyl)-6,9,12,15,18-pentaoxo-19-(L-phenylalanylamino)-1,2-dithia-5,8,11,14,17-pentaazacycloicosane-4-carboxamide