You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2R,3S,4S,5R)-3,4-diacetyloxy-5-(2,4-dioxopyrimidin-1-yl)-2-ethynyloxolan-2-yl]methyl acetate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H18N2O9
assistant