You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 2-[5-fluoro-2-[2-[(4-methylsulfanylbenzoyl)amino]ethyl]-1H-indol-3-yl]acetate is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H23FN2O3S
assistant