2,4(1H,3H)-Pyrimidinedione, 1-[2,5-anhydro-4-C-[[bis(4-methoxyphenyl)phenylmethoxy]methyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-3-C-[2-[(1,4-dioxopentyl)oxy]ethyl]-α-L-lyxofuranosyl]-5-methyl-