3,7,11,15,19-Pentaoxa-4,8,12,16,20-pentaazapentacosanoic acid,22-[(1,3-dihydro-1,3-dioxo-2H-isoindol-2-yl)oxy]-24-methyl-6,14-bis(2-methylpropyl)-5,9,13,17,21-pentaoxo-2,10,18-tris(phenylmethyl)-,1,1-dimethylethyl ester, (2S,6R,10S,14R,18S,22R)-