You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[(2R,3R,4R,5R)-2-[(2S)-1-diethoxyphosphorylpropan-2-yl]-4-fluoro-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-3-yl]oxy-4-oxobutanoic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H30FN2O10P
assistant