You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[[(2R,3S,4R,5R)-3,4-dihydroxy-5-(5-naphthalen-2-ylsulfanyl-2,4-dioxopyrimidin-1-yl)oxolan-2-yl]methoxy-hydroxyphosphoryl] [hydroxy(methoxy)phosphoryl] hydrogen phosphate is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H23N2O15P3S
assistant