1-{[(4R,7S,10S,16S,19R)-19-amino-10-(3-amino-3-oxopropyl)-13-[(2S)-butan-2-yl]-7-(carboxymethyl)-16-(4-hydroxybenzyl)-6,9,12,15,18-pentaoxo-1,2-dithia-5,8,11,14,17-pentaazacycloicosan-4-yl]carbonyl}-L-prolyl-L-leucylglycinamide