You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3S)-1-[(3-fluorophenyl)methyl]-3-hydroxy-3-[2-(4-methoxyphenyl)-2-oxoethyl]indol-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C24H20FNO4
assistant