You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(3R)-1-(4-methoxyphenyl)sulfonylpyrrolidin-3-yl]-4-pyridin-2-yl-1H-pyrimidin-6-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H20N4O4S
assistant