Fomivirsen

1-[4-[[3-[[5-(2-amino-6-oxo-5H-purin-9-yl)-3-[[3-[[3-[[3-[[3-[[3-[[3-[[3-[[3-[[3-[[3-[[3-[[5-(2-amino-6-oxo-5H-purin-9-yl)-3-[[3-[[5-(2-amino-6-oxo-5H-purin-9-yl)-3-hydroxyoxolan-2-yl]methoxy-hydroxyphosphinothioyl]oxy-5-(4-amino-2-oxopyrimidin-1-yl)oxolan-2-yl]methoxy-hydroxyphosphinothioyl]oxyoxolan-2-yl]methoxy-hydroxyphosphinothioyl]oxy-5-(5-methyl-2,4-dioxo-1,3-diazinan-1-yl)oxolan-2-yl]methoxy-hydroxyphosphinothioyl]oxy-5-(5-methyl-2,4-dioxo-1,3-diazinan-1-yl)oxolan-2-yl]methoxy-hydroxyphosphinothioyl]oxy-5-(4-amino-2-oxopyrimidin-1-yl)oxolan-2-yl]methoxy-hydroxyphosphinothioyl]oxy-5-(5-methyl-2,4-dioxo-1,3-diazinan-1-yl)oxolan-2-yl]methoxy-hydroxyphosphinothioyl]oxy-5-(5-methyl-2,4-dioxo-1,3-diazinan-1-yl)oxolan-2-yl]methoxy-hydroxyphosphinothioyl]oxy-5-(4-amino-2-oxopyrimidin-1-yl)oxolan-2-yl]methoxy-hydroxyphosphinothioyl]oxy-5-(5-methyl-2,4-dioxo-1,3-diazinan-1-yl)oxolan-2-yl]methoxy-hydroxyphosphinothioyl]oxy-5-(5-methyl-2,4-dioxo-1,3-diazinan-1-yl)oxolan-2-yl]methoxy-hydroxyphosphinothioyl]oxy-5-(4-amino-2-oxopyrimidin-1-yl)oxolan-2-yl]methoxy-hydroxyphosphinothioyl]oxy-5-(5-methyl-2,4-dioxo-1,3-diazinan-1-yl)oxolan-2-yl]methoxy-hydroxyphosphinothioyl]oxy-5-(4-amino-2-oxopyrimidin-1-yl)oxolan-2-yl]methoxy-hydroxyphosphinothioyl]oxyoxolan-2-yl]methoxy-hydroxyphosphinothioyl]oxy-5-(5-methyl-2,4-dioxo-1,3-diazinan-1-yl)oxolan-2-yl]methoxy-hydroxyphosphinothioyl]oxy-5-[[[2-[[[5-(2-amino-6-oxo-5H-purin-9-yl)-2-[[[2-[[[5-(2-amino-6-oxo-5H-purin-9-yl)-2-(hydroxymethyl)oxolan-3-yl]oxy-hydroxyphosphinothioyl]oxymethyl]-5-(4-amino-2-oxopyrimidin-1-yl)oxolan-3-yl]oxy-sulfanylphosphoryl]oxymethyl]oxolan-3-yl]oxy-hydroxyphosphinothioyl]oxymethyl]-5-(5-methyl-2,4-dioxo-1,3-diazinan-1-yl)oxolan-3-yl]oxy-hydroxyphosphinothioyl]oxymethyl]oxolan-2-yl]-5-methyl-1,3-diazinane-2,4-dione