(2R)-3-{[(6R,9S,12R,15R,18R,21R,24S)-24-(acetylamino)-1-amino-12,15,18-tris(3-{[amino(azanylidene)methyl]amino}propyl)-1-azanylidene-6-carbamoyl-9,21-dimethyl-8,11,14,17,20,23-hexaoxo-2,7,10,13,16,19,22-heptazapentacos-25-yl]disulfanyl}-2-aminopropanoic acid 2,2,2-trifluoroacetic acid