(4R,7S,10S,13R,16S,19R)-10-(4-aminobutyl)-19-[(2-amino-3-phenylpropanoyl)amino]-16-benzyl-13-(2,3-dihydro-1H-indol-3-ylmethyl)-N-[(2R,3R)-1,3-dihydroxybut-2-yl]-7-[(1R)-1-hydroxyethyl]-6,9,12,15,18-pentaoxo-1,2-dithia-5,8,11,14,17-pentazacycloicosane-4-carboxamide acetic acid