(2S)-1-[(4R,7S,10S,13S,16S,19R)-19-amino-7-(2-amino-2-oxo-ethyl)-10-(3-amino-3-oxo-propyl)-13,16-dibenzyl-6,9,12,15,18-pentaoxo-1,2-dithia-5,8,11,14,17-pentazacycloicosane-4-carbonyl]-N-[(1S)-5-amino-1-[(2-amino-2-oxo-ethyl)carbamoyl]pentyl]pyrrolidine-2-carboxamide