(2S)-2-{[(2R)-1-{[(4S,7R,13R,16S)-13-benzyl-7-(carbamoylmethyl)-16-[(4-hydroxyphenyl)methyl]-10-(1H-indol-3-ylmethyl)-6,9,12,15,18-pentaoxo-1,2-dithia-5,8,11,14,17-pentaazacycloicosan-4-yl]carbonyl}pyrrolidin-2-yl]formamido}-N-(carbamoylmethyl)-5-[(diaminomethylidene)amino]pentanamide