[2-[[[2-[[[2-[[[2-[[[2-[[[5-(2-amino-6-oxo-1H-purin-9-yl)-2-[[hydroxy(propan-2-yl)phosphoryl]oxymethyl]-4-methoxyoxolan-3-yl]oxy-hydroxyphosphoryl]oxymethyl]-5-(4-amino-2-oxopyrimidin-1-yl)oxolan-3-yl]oxy-hydroxyphosphoryl]oxymethyl]-5-(6-aminopurin-9-yl)oxolan-3-yl]oxy-hydroxyphosphoryl]oxymethyl]-5-(2,4-dioxopyrimidin-1-yl)-4-fluorooxolan-3-yl]oxy-hydroxyphosphoryl]oxymethyl]-5-(4-amino-2-oxopyrimidin-1-yl)-4-fluorooxolan-3-yl]oxy-hydroxyphosphoryl]oxymethyl]-5-(6-aminopurin-9-yl)-4-methoxyoxolan-3-yl]oxy-oxo-[2-[2-[2-[2-[2-(2-propan-2-yloxyethoxy)ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]phosphanium