(S)-1-[3-hydroxy-2-(phosphonomethoxy)propyl]cytosine 17-hydroxy-3,6,9,12,15-pentaoxaheptadecyl ester

4-amino-1-(((5S)-2-oxido-2-((17-((tetrahydro-2H-pyran-2-yl)oxy)-3,6,9,12,15-pentaoxaheptadecyl)oxy)-1,4,2-dioxaphosphinan-5-yl)methyl)pyrimidin-2(1H)-one