Benzamide, N-[9-[6-[bis[(2,2-dimethyl-1-oxopropoxy)methoxy]phosphinyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-5,6-dideoxy-2-O-methyl-β-D-ribo-hexofuranosyl]-9H-purin-6-yl]-

Benzamide, N-[9-[6-[bis[(2,2-dimethyl-1-oxopropoxy)methoxy]phosphinyl]-5,6-dideoxy-2-O-methyl-β-D-ribo-hexofuranosyl]-9H-purin-6-yl]-