5,11,17,23-Tetraoxa-2,8,14,20-tetraazapentacosanedioic acid, 2,3,8,9,14,15,20,21-octamethyl-4,7,10,13,16,19,22-heptaoxo-6,12,18, 24-tetrapentyl-, 1-(1,1-dimethylethyl) 25-(phenylmethyl) ester, (3S,