4,8,12,16,20,24,28,32-Octaazahexatriacontanoic acid,35-amino-7,19,31-tris(4-aminobutyl)-11,23-dimethyl-5,9,13,17,21,25,29,33-octaoxo-3,15,27-tris(phenylmethyl)-,(3R,7R,11R,15R,19R,23R,27R,31R,35R)-, trifluoroacetate