You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(4-methylsulfonylphenyl)-1-(5-pyridin-4-yl-2,3-dihydroindol-1-yl)propan-1-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H22N2O3S
assistant