(N1,N4,N9,N13-tetra-tert-butoxycarbonyl)-1,16-diamino-4,9,13-triazahexadecane

28-[1-[(1,1-dimethylethoxy)carbonyl]-1H-indol-3-yl]-2,2-dimethyl-4,27-dioxo-3-oxa-5,9,14,18,22,26-hexaazaoctacosane-9,14,18-tricarboxylic acid tris(1,1-dimethylethyl) ester

25-amino-2,2-dimethyl-4-oxo-3-oxa-5,9,14,18,22-pentaazapentacosane-9,14,18-tricarboxylic acid tris(1,1-dimethylethyl) ester