2-{[(2R)-2-({[(2S)-1-{[(4R,7S,10S,13S,16S)-13-benzyl-7-(carbamoylmethyl)-10-(2,6-dioxo-3,5-diazaoct-8-yl)-16-[(4-hydroxyphenyl)methyl]-6,9,12,15,18-pentaoxo-1,2-dithia-5,8,11,14,17-pentazacycloicosan-4-yl]carbonyl}pyrrolidin-2-yl]carbonyl}amino)-5-{[amino(azanylidene)methyl]amino}-1-oxopentyl]amino}acetamide