3-[(3R,6S,9S,12S,15S)-12-[(2S)-but-2-yl]-6-(carbamoylmethyl)-3-{[(2S)-2-[(3R)-3-[(2S)-but-2-yl]-6-carbamoyl-1,4-dioxo-2,5-diazahex-1-yl]tetrahydro-1H-pyrrol-1-yl]carbonyl}-15-[(4-methoxyphenyl)methyl]-5,8,11,14,17-pentaoxo-4,7,10,13,16-pentaza-1-thiacycloicosan-9-yl]propanamide