2,5,8,11-Tetraoxa-14,17-diazaoctadecan-18-oic acid, 1-[4-[[(2-amino-1H-purin-6-yl)oxy]methyl]phenyl]-16-[4-[[1-(4,4-dimethyl- 2,6-dioxocyclohexylidene)ethyl]amino]butyl]-15-oxo-, 9H-fluoren-9-ylmet