(4R,7S,10S,13R,16S,19R)-13-(1H-indol-3-ylmethyl)-19-{[(2R)-2-amino-3-phenylpropanoyl]amino}-10-(4-aminobutyl)-16-benzyl-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