N-[9-[3-Deoxy-2-O-(1,4-dioxopentyl)-3-fluoro-β-D-xylofuranosyl]-6,9-dihydro-6-oxo-1H-purin-2-yl]-2-methylpropanamide

N-[9-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-3-deoxy-3-fluoro-β-D-xylofuranosyl]-6,9-dihydro-6-oxo-1H-purin-2-yl]-2-methylpropanamide