(2S,5S,8S,11S,14S,17S)-2-((1H-Imidazol-5-yl)methyl)-17-amino-5-((S)-sec-butyl)-1-((S)-2-(((S)-1-carboxy-2-phenylethyl)carbamoyl)pyrrolidin-1-yl)-14-(3-guanidinopropyl)-8-(4-hydroxybenzyl)-11-isopropyl-1,4,7,10,13,16-hexaoxo-3,6,9,12,15-pentaazanonadecan-19-oic acid xacetic acid