[(2R,3R,4R,5R)-4-[[(2S,6R)-4-[2-[2-[2-[2-[2-[2-[2-[[2-[2-[[2-[2-[[2-[2-[(2-amino-2-oxoethyl)-[2-(5-methyl-2,4-dioxopyrimidin-1-yl)acetyl]amino]ethylamino]-2-oxoethyl]-[2-(5-methyl-2,4-dioxopyrimidin-1-yl)acetyl]amino]ethylamino]-2-oxoethyl]-[2-(5-methyl-2,4-dioxopyrimidin-1-yl)acetyl]amino]ethylamino]-2-oxoethyl]-[2-(5-methyl-2,4-dioxopyrimidin-1-yl)acetyl]amino]ethylamino]-2-oxoethoxy]ethoxy]ethylamino]-2-oxoethoxy]ethoxy]ethyl]-6-(6-aminopurin-9-yl)morpholin-2-yl]methoxy-hydroxyphosphoryl]oxy-5-(6-aminopurin-9-yl)-3-hydroxyoxolan-2-yl]methyl [(2R,3R,4R,5R)-2-(6-aminopurin-9-yl)-4-methoxy-5-(phosphonooxymethyl)oxolan-3-yl] hydrogen phosphate